Systematic review and recommendations for nonodontogenic toothache Hirofumi Yatani, DDS, PhD a, Osamu Komiyama, DDS, PhD b, Yoshizo Matsuka, DDS, PhD c , Koichi Wajima, DDS, PhD d, Wataru Muraoka, DDS, PhD d, Masako Ikawa, DDS, PhD e, Eiji Sakamoto, DDS, PhD f, Antoon De Laat, LDS, GHO g , Gary Heir, DMD h a Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry, Osaka, 1-8 Yamadaoka, Suita, Japan b Department of Oral Function and Rehabilitation, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho-nishi, Matsudo, Chiba, Japan c Department of Fixed Prosthodontics, Institute of Health Biosciences, The University of Tokushima Graduate School, 3-18-15 Kuramoto-cho, Tokushima, Japan d Department of Dentistry and Oral Surgery, School of Medicine, Keio University, 35 Shinanomachi, Shinjuku, Tokyo, Japan e Orofacial Pain Clinic, Department of Oral Surgery, Shizuoka Municipal Shimizu Hospital, 1231 Miyakami, Shimizu-ku, Shizuoka, Japan f Department of Dental Anesthesiology, Faculty of Dental Science, Kyushu University, 3-1-1 Mumade, Higashi-ku, Fukuoka, Japan 1 g Department of Oral Health Sciences, KU Leuven & Dentistry, University Hospitals, Oude Markt 13 - bus 5005 3000 Leuven, Belgium h Center for Temporomandibular Disorders and Orofacial Pain, Rutgers School of Dental Medicine, Rutgers, the State University of New Jersey, 110 Bergen Street, Newark, NJ, USA Address for correspondence: Yoshizo Matsuka Department of Fixed Prosthodontics, Institute of Health Biosciences, The University of Tokushima Graduate School, 3-18-15 Kuramoto-cho, Tokushima, 770-8504, Japan TEL: +81-88-633-7350, FAX: +81-88-633-7391, e-mail: matsuka@tokushima-u.ac.jp 2 ABSTRACT Aims:Nonodontogenic toothache is a painful condition that occurs in the absence of a clinically evident cause in the teeth or periodontal tissues. The purpose of this review is to improve the accuracy of diagnosis and the quality of dental treatment regarding nonodontogenic toothache. Methods: Electronic databases were searched to assess the best scientific evidence regarding related primary disorders and the management of nonodontogenic toothache. We evaluated the level of available evidence in the scientific literature. Results: There are a number of possible causes of nonodontogenic toothache and they should be treated according to these causes. Nonodontogenic toothache was categorized into eight groups according to primary disorders as follows: 1) myofascial pain referred to tooth/teeth, 2) neuropathic toothache, 3) idiopathic toothache, 4) neurovascular toothache, 5) sinus pain referred to tooth/teeth, 6) cardiac pain referred to tooth/teeth, 7) psychogenic toothache or toothache of psychosocial origin and 8) toothache caused by various other disorders. Conclusion: We concluded that unnecessary dental treatment should be avoided. Key words: nonodontogenic toothache, myofascial pain, neuropathic pain, neurovascular pain, idiopathic toothache Clinical Relevance: This review discusses etiology and management of nonodontogenic toothache based on the available scientific evidence. This review addresses all medical personnel involved in dental treatment. 3 INTRODUCTION Nonodontogenic toothache, as its name suggests, is a painful condition that occurs in the absence of any clinically evident cause in the teeth or periodontal tissues 1, 2. 88% of patients with toothache-like pain visit a dental office; 3% of these patients have nonodontogenic toothache and 9% have a mixed condition of odontogenic and nonodontogenic toothache. It has been gradually recognized that nonodontogenic toothache is not rare 3. However, general dentists and specialists may not be familiar with diagnostic criteria or managements for nonodontogenic toothache 1,3. Toothaches are a frequently observed condition in regular dental practice and the diagnosis and treatment of primary toothache are not difficult; however, nonodontogenic toothache is not routinely studied. The current approach to nonodontogenic toothache often involves ineffective or irreversible dental procedures such as pulpectomy and/or tooth extraction 1,3. Since nonodontogenic toothache is a condition with multiple pathophysiological causes 4-11, some patients may suffer from long-lasting pain of unknown origin after undergoing dental treatments. Dentists are required to reduce the use of irreversible dental treatments in patients with toothache in the absence of clinically evident causes. The purpose of this review is to improve the accuracy of diagnosis and the quality of dental treatment regarding nonodontogenic toothache. MATERIALS AND METHODS The inclusion and exclusion criteria for selecting papers were established prior to conducting the literature search. The inclusion criteria consisted of English written clinical studies: systematic reviews, randomized controlled trials (RCTs), controlled 4 clinical trials (CCTs) or case series in which the diagnosis and treatment of nonodontogenic toothache were described. Treatment guidelines and systematic reviews for the diagnosis and treatment of a primary condition or diseases underlying nonodontogenic toothache (e.g. trigeminal neuralgia,) were also included. Furthermore, case reports were considered to include “Toothache caused by other various conditions or diseases” because the conditions and diseases may be rare. The exclusion criteria were studies without human patients or articles written with authors’ opinion. Both electronic and manual searches were undertaken to identify all clinically relevant studies written in English. The electronic search was conducted by two authors (OK, YM) using PubMed (Medline) on October 30th 2013 with the following retrieval style: “non-odontogenic toothache OR nonodontogenic toothache OR atypical odontalgia OR toothache non dental OR (toothache AND neuralgia) OR (toothache AND (headache OR vascular OR neurovascular OR neurovascular orofacial pain)) OR (toothache AND (myofascial pain OR muscle pain OR myalgia OR musculoskeletal orofacial pain))) OR (toothache AND cardiac) OR (toothache AND neuropathic OR neuropathic orofacial pain)) OR (toothache AND maxillary sinus) OR (toothache AND nasal mucosa) OR (toothache AND (psychogenic OR psychological)).” A total of 891 studies were found. The reference lists of all the relevant studies, existing reviews and personal reprint collections of the authors were screened for additional relevant publications. Each publication was initially assessed for relevance by two authors (YM, WM) using the information presented in the abstract. When an abstract was not available or failed to provide sufficient information, a reprint of the full paper was obtained. When papers or abstracts reported different stages of clinical trials, only the 5 longer-term study was included in the review. Then all publications were reviewed by 7 authors (HY, OK, YM, KW, WM, MI, ES). REVIEW OF LITERATURE Many variable primary conditions or diseases cause nonodontogenic toothache 12-15, and there are some reports illustrating that pulpectomy 3 or tooth extraction 16 failed to relieve pain. Since in most cases of idiopathic toothache, the pain increases following tooth extraction, spreading to adjacent teeth and continuing to the residual alveolar ridge, it is important to avoid pulpectomy or tooth extraction 3, 16. In 100 nonodontogenic orofacial pain patients referred to orofacial pain specialists, 44% received tooth extraction or root canal treatment prior to referral 16. Understanding the primary problem underlying nonodontogenic toothache helps to identify pathophysiology and is important for achieving a diagnosis and selecting a treatment plan. It is possible that nonodontogenic toothache may arise from a primary condition or from multifactorial etiologies. Following the literature search, nonodontogenic toothache was categorized into eight groups according to primary disorders as follows: 1) Myofascial pain referred to tooth/teeth, 2) Neuropathic toothache, 3) Idiopathic toothache, 4) Neurovascular toothache, 5) Sinus pain referred to tooth/teeth, 6) Cardiac pain referred to tooth/teeth, 7) Psychogenic toothache or toothache of psychosocial origin, and 8) Toothache caused by various other disorders (Table 1). Nonodontogenic toothache is a heterotopic pain. It consists of projected nerve pain which is felt throughout the peripheral distribution of the affected nerve (trigeminal neuralgia, cluster headache, post herpetic neuralgia etc.) or referred pain as a result of 6 convergence and central sensitization (myofascial pain referred to tooth/teeth, toothache, sinus pain referred to tooth/teeth, cardiac pain referred to tooth/teeth, etc. ) 17. Myofascial pain referred to tooth/teeth Myofascial pain of the masticatory muscles is a frequently observed primary disorder associated with nonodontogenic toothache and symptoms including spontaneous and continuous dull pain 18. It was reported that 11% of myofascial pain patients complain of nonodontogenic toothache, and the masseter muscle often appears as the causal muscle 18. An important part (49.6-85%) of cases of myofascial pain of the head and neck muscles involves nonodontogenic toothache induced by referred pain 18 . A diagnosis of nonodontogenic toothache caused by myofascial pain can be effectively made based on the fact that five seconds palpation of the trigger points of the involved muscle increases the pain 19. The guidelines of the American Academy of Orofacial Pain (AAOP) 17 indicate that trigger point injection is useful for diagnostic decision making as well as for treatment. There are several scientifically verified papers regarding the reproducibility of sites of referred pain originating from trigger points 20, 21. Treatment: Since toothache is caused by myofascial problems, behavioral modification (soft food diet, resting the jaw, self-massage, hot packs, etc.) is beneficial 17. Physical therapy is effective for treating toothache and includes the following treatments: stretching exercises, massage, thermotherapy and posture correction. Muscle relaxants are used for pain relief 17 , but their use should be limited to a few weeks 17 . Pharmacologic therapies that demonstrated efficacy for myofascial pain causing nonodontogenic toothache involved ibuprofen and low-dose amitriptyline 17. Occlusal splint therapy has only a few reliable studies that sufficiently support its efficacy for 7 treating myofascial pain 22-25 . Acupuncture has a statistically significant effect on temporomandibular disorders compared to a placebo 26, but the actual specific effect is controversial 27, 28. Neuropathic toothache Episodic neuropathic toothache Trigeminal neuralgia (TN) is a disorder associated with episodic neuropathic toothache 15, 29 . The paroxysm of trigeminal neuralgia is provoked by relatively innocuous peripheral stimulation of a “trigger zone” at intra-oral or extra-oral sites. TN must be differentiated from pulpitis and local anesthesia with 8% xylocaine spray administered at the trigger zone intraorally reduces the episodes of paroxysmal pain 29. The absence of dental pathological findings should be confirmed using radiographic and clinical examinations (e.g. percussion pain of the tooth 29 ). The pathophysiology of trigeminal neuralgia is categorized as classical or secondary. In cases of vascular compression of the trigeminal nerve root, demyelination may occur resulting in classical trigeminal neuralgia. Tumors or other demyelinating disorders such as multiple sclerosis or other autoimmune diseases may be the cause of symptomatic secondary TN 30. Treatment: According to the guidelines developed by the American Academy of Neurology (AAN) and the European Federation of Neurological Societies (EFNS), there is strong evidence to support the use of carbamazepine as a first-line drug for trigeminal neuralgia 31 . These societies recommend oxcarbazepine as the second choice and baclofen and lamotrigine as third choice 32. Toothache may disappear concurrently with improvements in paroxysmal neuralgia; however, it may be difficult to make a 8 diagnosis in cases of comorbidity with odontogenic pathology procedures 30 . The surgical include microvascular decompression, radiofrequency thermocoagulation and stereotactic radiosurgery (gamma knife surgery) for classical trigeminal neuralgia 33 . Continuous neuropathic toothache Herpes zoster (HZ) of the face may also be associated with toothache and pulpitis-like pain suddenly appears in healthy teeth and becomes intense within a few days. Painful posttraumatic trigeminal neuropathy (PTTN) developing as a result of nerve injury that occurs during dental treatment is also a cause of persistent neuropathic toothache 34. Treatment : Pharmacological therapy for continuous neuropathic pain should be administered according to the guidelines developed by the National Institute for Health and Clinical Excellence (NICE) 35 , the IASP 36 and the EFNS 37 . Tricyclic antidepressants, serotonin noradrenaline reuptake inhibitors, the anticonvulsants gabapentin and pregabalin, and opioids are the drug classes for which there is the best evidence for a clinical relevant effect 38. Patches with a local anesthetic have also been shown to provide relief when applied to affected areas 39. Idiopathic toothache There are no multidisciplinary studies on idiopathic toothache (i.e. persistent dentoalveolar pain: PDAP) since the diagnostic criteria for the condition is unclear 40, 41. Some reports define idiopathic toothache as characterized by continuous pain in the teeth and/or periodontal tissues without objective pathophysiological or radiological findings at the site of pain, and with an unknown etiology that lasts over four or six 9 months 42, 43 . Neuropathic and idiopathic toothaches are closer to each other, since studies from the last decade indicate that patients clinically diagnosed with atypical odontalgia (AO) may in fact suffer from “definite” or “probable” PTTN, if somatosensory disturbances can be demonstrated and if other confirmatory tests can be applied 44-46 . The new IHS classification 30 refers to this entity as PIFP (persistent idiopathic facial pain) 47 and classifies it as a painful trigeminal neuropathy 45, while the term “atypical odontalgia” used in this paper as a historical reference, is no longer in common use. 85% of patients with atypical odontalgia exhibit abnormal qualitative somatosensory responses 48 . The most frequent somatosensory abnormalities in AO patients were somatosensory gain with regard to painful mechanical and cold stimuli and somatosensory loss with regard to cold detection and mechanical detection 44. As mentioned, QST is useful in diagnostic decision making of atypical odontalgia within each patient 49-51 . Atypical odontalgia patients complain of increased pain intensity following the application of topical capsaicin cream 52, and have diminished blink reflex R2 waves in comparison with normal subjects 53. Treatment: The efficacy of tricyclic antidepressants was shown to be 60-75% 54 for idiopathic toothache with most common reports using amitriptyline. Tricyclic antidepressants are considered to have a high efficacy; however, the reports are only case series or case-controlled studies, and the evidence level is not high 55, 56 . Anticonvulsants are frequently used, as a considerable proportion of these patients may have neuropathic mechanisms underlying their pain chronic neuropathic pain have been reported 47, 57, 58. 10 47 . Other topical treatments for Neurovascular toothache The relationship between toothache and neurovascular headaches such as migraines 14, cluster headaches and other trigeminal autonomic cephalalgias (TACs) cannot be denied, since patients with neurovascular headaches commonly visit dental clinics with a chief complaint of toothache 14, 59. Migraine without aura, which arises in the mid face, has a throbbing and persistent quality similar to toothache. Van Vliet et al. showed that 34% of 1163 cluster headache patients visited a dental clinic 60. Regarding cluster headaches, continuous intense pain occurs in the maxillary molar region for 15 to 180 minutes, and then suddenly disappears 60. It is important to examine the available diagnostic criteria for various headaches following the International Classification of Headache Disorders (ICHD) 30. Treatment: Treatment for neurovascular toothache following migraine, cluster headaches paroxysmal hemicranias, and SUNCT is administered in accordance with the ICHD 30, and affected patients are referred to a neurologist, neurosurgeon or headache clinic 14. Pharmacologic therapy for migraines normally includes triptans which are used for the acute phase as abortive therapy. Topiramate, valproic acid or amitriptyline are used for prophylactic treatment 17, 61. Regarding cluster headache, oxygen inhalation, triptans, and dihydroergotamine were used for abortive therapy, while verapamil, corticosteroids (short term), lithium, divalproex sodium, and topiramate were used for prophylactic therapy 62, 63. Sinus pain referred to tooth/teeth Sinus pain referred to tooth/teeth is due to referred pain from acute sinusitis. Toothache due to acute sinusitis frequently occurs in the maxillary premolar and molar regions, but 11 it is rare that chronic sinusitis is accompanied by toothache; it typically induces nasal congestion and dull headaches 64. Pain occurs in the maxillary molar teeth induced by cold stimulation or mastication, and dysesthesia arises with tooth clenching. The pain increases when the patient bends over. Sinus pain referred to tooth/teeth is diagnosed using computed tomography (CT) and histopathological examinations showing sinusitis or malignant fibrous histocytoma 65. Treatment: The patients with toothache due to acute sinusitis are referred to an otorhinolaryngologist for treatment of nonodontogenic sinusitis. Cardiac pain referred to tooth/teeth There are many reports regarding toothache caused by ischemic heart diseases such as angina 66-69. Kreiner et al. reported that 71 (38%) of 186 ischemic heart disease patients experienced facial pain during heart attacks with a significantly higher frequency in females. Eighty-five percent (60/71) experienced chest and facial pain simultaneously, while 11/71 (15%) experienced facial pain only 70. Dentists need to be aware of the possibility of ischemic heart disease in patients who visit the clinic with complaints of toothache only. Referred pain caused by ischemic heart disease is described as “tight” and “burning” in contrast to the “throbbing and “tingling” of odontogenic toothache. The common characteristic features of ischemic heart disease (aggravation induced by exercise, improvement at rest, bilateral symptoms, etc.) are considered in diagnostic decision making 71. An Echocardiogram is considered to be used to diagnose aortic dissection. 12 Treatment: Patients with cardiac pain referred to tooth/teeth must be referred to the cardiologist or other internal medicine specialists for treatment of the primary disease. Treatment includes anti-angina drugs (beta-adrenoreceptor blockers, nitric acid, etc.) and antithrombotic drugs (antiplatelet drugs, anticoagulants, etc.) . Psychogenic toothache or toothache of psychosocial origin Biopsychosocial factors affect pain, and chronic pain is closely related to psychosocial problems 72, 73, but there is no convincing evidence that psychological or emotional issues in itself can induce pain. Pain descriptors are often diffuse, vague, and difficult to localize. When the somatoform pain disorder is felt in the teeth, multiple teeth are often involved. Pain may be sharp, stabbing, intense, and sensitive to temperature changes, all of which are similar to pain symptoms of odontogenic origin. However, the pain is inconsistent with normal patterns of physiologic pain and presents without any identifiable pathological cause. When accompanied by other psychiatric features such as hallucinations or delusions, there is a greater possibility that the pain is of psychogenic origin. Treatment: Patients with psychogenic toothache caused by mental disorders need to be referred to neuropsychiatrists or liaison treatment specialists and treated with pharmacological therapy (antidepressant or antipsychotic drugs, etc.). Given that psychogenic toothache is a somatoform disorder, dental treatment will not resolve symptoms of pain and may potentially elicit an unexpected or unusual response to therapy. Patients should be referred to a psychiatrist or psychologist for further management. We must mention that chronic pain can cause depression or somatization as well 74. 13 Toothache caused by other various conditions or diseases Life-threatening diseases such as metastasis in the oral and maxillofacial area and breast carcinoma have been reported as primary diseases of toothache 75. Angioleiomyoma and methemoglobinemia may also be a primary disease of nonodontogenic toothache 76, 77. The most common cause for mental nerve neuropathy was dental treatment followed by malignant metastasis 78. Chemotherapy-induced toxicity injuries to the peripheral nerve might manifest as pulpitis-like toothache 79 . One of seven patients with temporal arteritis complains of toothache and gingival pain 80. An erythrocyte sedimentation rate (ESR) greater than 50 mm and the findings of a biopsy of the temporal artery are used to differentiate temporal arteritis 80. It is recommended that toothache caused by temporal arteritis be treated with steroid therapy by a rheumatologist or neurologist 80. Pain-like trigeminal neuralgia and numbness of the gingiva and buccal mucosa have been reported in cases of pontine infarction 81 or tumor 82. CT or MRI are used to confirm the primary diseases of adult T-cell lymphoma, jaw bone tumor, cervical disc herniation, cholesterol granuloma, brain tumor (meningioma), etc. Histopathologic examinations are used to diagnose cholesterol granuloma 83. SUMMARY This review outlines clinical practice guidelines for treating nonodontogenic toothache based on the available basic scientific knowledge and treatment systems and is addressed to all medical personnel involved in dental treatment. The literature was searched with regard to nonodontogenic toothache and its related primary diseases. 14 However, since nonodontogenic toothache is a condition with multiple pathophysiological causes and the process was difficult because high quality literature is still sparse. Further studies with appropriate evidence levels will be needed in the future. 15 REFERENCES 1. Balasubramaniam R, Turner LN, Fischer D, Klasser GD, Okeson JP. Non-odontogenic toothache revisited. Open J Stomatology 2011;1:92-102. 2. Sanner F. Acute right-sided facial pain: a case report. Int Endod J 2010;43:154-162. 3. Nixdorf DR, Moana-Filho EJ, Law AS, McGuire LA, Hodges JS, John MT. Frequency of nonodontogenic pain after endodontic therapy: a systematic review and meta-analysis. J Endod 2010;36:1494-1498. 4. Kim ST. Myofascial pain and toothaches. Aust Endod J 2005;31:106-110. 5. Matwychuk MJ. Diagnostic challenges of neuropathic tooth pain. J Can Dent Assoc 2004;70:542-546. 6. Gross SG. Dental presentations of cluster headaches. Curr Pain Headache Rep 2006;10:126-129. 7. Myers DE. Toothache referred from heart disease and lung cancer via the vagus nerve. General Dentistry 2010;58: e2-e5. 8. Weinberg MA, Gopinathan G. Recognition and treatment of migraine patient in dental practice. NY State Dent J 2009;75:28-33. 9. Koratkar H, Pedersen J. Atypical odontalgia: a review. Northwest Dent 2008;87:37-38,62. 10. Markman S, Howard J, Quek S. 16 Atypical odontalgia--a form of neuropathic pain that emulates dental pain. JNJ Dent Assoc 2008;79:27-31. 11. Clark GT. Persistent orodental pain, atypical odontalgia, and phantom tooth pain: when are they neuropathic disorders? J Calif Dent Assoc 2006;34:599-609. 12. Karibe H, Goddard G, McNeill C, Shih ST. Comparison of patients with orofacial pain of different diagnostic categories. Cranio 2011;29:138-143. 13. Germain L. Differential diagnosis of toothache pain. Part 2, nonodontogenic etiologies. Dent Today 2012;31:84-89. 14. Alonso AA, Nixdorf R. Case series of for different headache types presenting as tooth pain. J Endod 2006;32:1110-1113. 15. Siqueira JT, Lin HC, Nasri C, Siqueira SR, Teixeira MJ, Heir G, Valle LB. Clinical study of patients with persistent orofacial pain. Arq Neuropsiquiatr 2004;62: 988-996. 16. Linn J, Trantor I, Teo N, Thanigaivel R, Goss AN. The differential diagnosis of toothache from other orofacial pains in clinical practice. Austral Dent J Supplement 2007; 52(1 Suppl): S100-S104. 17. The American Academy of Orofacial Pain. In de Leeuw R (ed). Orofacial Pain - Guidelines for Assessment, Diagnosis, and Management. Chicago: Quintessence, 2013. 18. Wright EF. 17 Referred craniofacial pain patterns in patients with temporomandibular disorder. J Am Dent Assoc 2000;131:1307-1315. 19. Simons DG, Travel JG, Simons LS. In: Travell & Simons' Myofascial Pain and Dysfunction: The Trigger Point Manual : Upper Half of Body (Vol.1). Philadelphia: Lippincott Williams & Wilkins, 1999. 20. Al-Shenqiti AM, Oldham JA. Test-retest reliability of myofascial trigger point detection in patients with rotator cuff tendonitis. Clin Rehabil 2005;19:482-487. 21. Alonso-Blanco C, Fernández-de-Las-Peñas C, de-la-Llave-Rincón AI, Zarco-Moreno P, Galán-Del-Río F, Svensson P. Characteristics of referred muscle pain to the head from active trigger points in women with myofascial temporomandibular pain and fibromyalgia syndrome. J Headache Pain 2012;13:625-37. 22. Al-Ani Z, Gray RJ, Davies SJ, Sloan P, Glenny AM. Stabilization splint therapy for the treatment of temporomandibular myofascial pain: a systematic review. J Dent Educ 2005;69:1242-1250. 23. Türp JC, Komine F, Hugger A. Efficacy of stabilization splints for the management of patients with masticatory muscle pain: a qualitative systematic review . Clin Oral Investig 2004;8:179-195. 24. Fricton J. Current evidence providing clarity in management of temporomandibular disorders: summary of a systematic review of randomized clinical trials for intra-oral appliances and occlusal therapies. J Evid Based Dent Pract 2006;6:48-52. 25. Dubé C, Rompré PH, Manzini C, Guitard F, de Grandmont P, Lavigne GJ. 18 Quantitative polygraphic controlled study on efficacy and safety of oral splint devices in tooth-grinding subjects. J Dent Res 2004;83:398-403. 26. La Touche R, Goddard G, De-la-Hoz JL, Wang K, Paris-Alemany A, Angulo-Díaz-Parreño S, Mesa J, Hernández M. Acupuncture in the treatment of pain in temporomandibular disorders: a systematic review and meta-analysis of randomized controlled trials. Clin J Pain 2010;26:541-550. 27. Cho SH, Whang WW. Acupuncture for temporomandibular disorders: a systematic review. J Orofac Pain 2010;24:152-162. 28. La Touche R, Angulo-Díaz-Parreño S, de-la-Hoz JL, Fernández-Carnero J, Ge HY, Linares MT, Mesa J, Sánchez-Gutiérrez J. Effectiveness of acupuncture in the treatment of temporomandibular disorders of muscular origin: a systematic review of the last decade . J Altern Complement Med 2010;16:107-112. 29. Motamedi MH, Rahmat H, Bahrami E, Sadidi A, Navi F, Asadollahi M, Eshkevari PS. Trigeminal neuralgia and radiofrequency. J Calif Dent Assoc 2009;37: 109-114. 30. Headache Classification Committee of the International Headache Society. The International Classification of Headache Disorders. Cephalalgia 2013;33, 629-808. 31. Cruccu G, Gronseth G, Alksne J, Argoff C, Brainin M, Burchiel K, Nurmikko T, Zakrzewska JM. 19 AAN-EFNS guidelines on trigeminal neuralgia management, American Academy of Neurology Society; European Federation of Neurological Society. Eur J Neurol 2008;15:1013-1028. 32. Gronseth G, Cruccu G, Alksne J, Argoff C, Brainin M, Burchiel K, Nurmikko T, Zakrzewska JM. Practice parameter: the diagnostic evaluation and treatment of trigeminal neuralgia (an evidence-based review): report of the Quality Standards Subcommittee of the American Academy of Neurology and the European Federation of Neurological Societies. Neurology 2008;71:1183-1190. 33. Spatz AL, Zakrzewska JM, Kay EJ. Decision analysis of medical and surgical treatments for trigeminal neuralgia: how patient evaluations of benefits and risks affect the utility of treatment decisions. Pain. 2007;131:302-10. 34. Koratkar H, Parashar V, Koratkar S. A review of neuropathic pain conditions affecting teeth. Gen Dent 2010;58:436-441. 35. NICE clinical guideline, Neuropathic pain, 2010. (http://guidance.nice.org.uk/CG96) 36. Dworkin RH, O'Connor AB, Backonja M, Farrar JT, Finnerup NB, Jensen TS, Kalso EA, Loeser JD, Miaskowski C, Nurmikko TJ, Portenoy RK, Rice AS, Stacey BR, Treede RD, Turk DC, Wallace MS. Pharmacologic management of neuropathic pain: evidence-based recommendations. Pain 2007;132:237-251. 37. Attal N, Cruccu G, Baron R, Haanpää M, Hansson P, Jensen TS, Nurmikko T. 20 European Federation of Neurological Societies: EFNS guidelines on the pharmacological treatment of neuropathic pain: 2010 revision. Eur J Neurol 2010;17:1113-1188. 38. Pavan-Langston D. Herpes zoster antivirals and pain management. Ophthalmology. 2008 Feb;115(2 Suppl):S13-20. 39. Davies PS, Galer BS. Review of lidocaine patch 5% studies in the treatment of post herpetic neuralgia. Drugs 2004;64:937-47. 40. Bosch-Aranda ML, Vázquez-Delgado E, Gay-Escoda C. Atypical odontalgia: a systematic review following the evidence-based principles of dentistry. Cranio 2011;29:219-226. 41. Nixdorf D, Moana-Filho E. Persistent Dento-Alveolar Pain Disorder (PDAP): Working towards a Better Understanding. British Journal of Pain 2011; 5:18-27. 42. List T, Leijon G, Helkimo M, Oster A, Dworkin SF, Svensson P. Clinical findings and psychosocial factors in patients with atypical odontalgia: a case-control study. J Orofac Pain 2007;21:89-98. 43. Ram S, Turuel A, Kumar SKS, Clark G. Clinical characteristics and diagnosis of atypical odontalgia: implications for dentists. J Am Dent Assoc 2009;140: 223-228. 44. Baad-Hansen L, Pigg M, Ivanovic SE, Faris H, List T, Drangsholt M, Svensson P. Intraoral somatosensory abnormalities in patients with atypical odontalgia-a controlled multicenter quantitative sensory testing study. Pain 2013;154 :1287–1294. 21 45. Benoliel R, Zadik Y, Eliav E, Sharav Y. Peripheral painful traumatic trigeminal neuropathy: clinical features in 91 cases and proposal of novel diagnostic criteria. J Orofac Pain 2012;26:49-58. 46. Baad-Hansen L, Leijon G, Svensson P, List T. Comparison of clinical findings and psychosocial factors in patients with atypical odontalgia and temporomandibular disorders. J Orofac Pain 2008;22:7-14. 47. Martin WJJM, Forouzanfar T. The efficacy of anticonvulsants on orofacial pain: a systematic review. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2011;111,:627–633. 48. List T,Leijon G,Svensson P. Somatosensory abnormalities in atypical odontalgia: A case-control study. Pain 2008;139:333-341. 49. Baad-Hansen L. Atypical odontalgia- pathophysiology and clinical management. J Oral Reabil 2008;35:1-11. 50. Zagury JG, Eliav E, Heir GM, Nasri-Heir C, Ananthan S, Pertes R, Sharav Y, Benoliel R. Prolonged gingival cold allodynia: a novel finding in patients with atypical odontalgia. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2011;111:312-9. 51. Pigg M, List T, Petersson K, Lindh C, Petersson A. Diagnostic yield of conventional radiographic and cone-beam computed tomographic images in patients with atypical odontalgia. Int Endod J 2011;44:1092-1101. 52. Baad-Hansen L, List T, Jensen TS, Svensson P. 22 Increased pain sensitivity to intraoral capsaicin in patients with atypical odontalgia. J Orofac Pain 2006;20:107-114. 53. Baad-Hansen L, List T, Kaube H, Jensen TS, Svensson P. Blink reflexes in patients with atypical odontalgia and matched healthy controls. Exp Brain Res 2006;172:498-506. 54. Melis M, Secci S. Diagnosis and treatment of atypical odontalgia: a review of the literature and two case reports. J Contemp Dent Pract 2007;8:81-89. 55. Wirz S, Wartenberg HC, Wittmann M, Baumgarten G. Managing patients with chronic orofacial pain in the outpatient departments of dental and maxillofacial surgeons. Results of a survey. Schmerz 2003;17:325-331. 56. Abiko Y, Matsuoka H, Chiba I, Toyofuku A. Current evidence on atypical odontalgia: diagnosis and clinical management. Int J Dent 2012;2012:518-548. 57. Heir G, Karolchek S, Kalladka M, Vishwanath A, Gomes J, Khatri R, Nasri C, Eliav E, Ananthan S. Use of topical medication in orofacial neuropathic pain: a retrospective study. Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2008;105:466-469. 58. List T, Leijon G, Helkimo M, Oster A, Svensson P. Effect of local anesthesia on atypical odontalgia--a randomized controlled trial. Pain 2006;122:306-314. 59. Benoliel R, Birman N, Eliav E, Sharav Y. The International Classification of Headache Disorders: accurate diagnosis of orofacial pain? Cephalalgia. 2008;28:752-62. 23 60. van Vliet JA, Eekers PJE, Haan J, Ferrari MD. Features involved in the diagnostic delay of cluster headache . J Neurol Neurosurg Psychiatry 2003;74:1123-1125. 61. Diener HC, Tfelt-Hansen P, Dahlöf C, Láinez MJ, Sandrini G, Wang SJ, Neto W, Vijapurkar U, Doyle A, Jacobs D, MIGR-003 Study Group. Topiramate in migraine prophylaxis--results from a placebo-controlled trial with propranolol as an active control. J Neurol 2004;251:943-950. 62. Capobianco DJ, Dodick DW. Diagnosis and treatment of cluster headache. Semin Neurol 2006;26:242-259. 63. May A, Leone M, Afra J, Linde M, Sándor PS, Evers S, Goadsby PJ, EFNS Task Force. EFNS guidelines on the treatment of cluster headache and other trigeminal-autonomic cephalalgias. Eur J Neurol 2006;13:1066-1077. 64. Hansen JG, Hojbjerg T, Rosborg J. Symptoms and signs in culture-proven acute maxillary sinusitis in a general practice population. APMIS 2009;117:724-729. 65. Hansen JG, Lund E. The association between paranasal computerized tomography scans and symptoms and signs in a general practice population with acute maxillary sinusitis. APMIS 2011;119:44-48. 66. Culic V, Miric D, Eterovic D. Correlation between symptomatology and site of acute myocardial infarction. Int J Cardiol 2001;77:163-168. 67. Granot M, Goldstein-Ferber S, Azzam ZS. 24 Gender differences in the perception of chest pain. J Pain Symptom Manage 2004;27:149-155. 68. Kosuge M, Kimura K, Ishikawa T, Ebina T, Hibi K, Tsukahara K, Kanna M, Iwahashi N, Okuda J, Nozawa N, Ozaki H, Yano H, Nakati T, Kusama I, Umemura S. Differences between men and women in terms of clinical features of ST-segment elevation acute myocardial infarction. Circ J 2006;70:222-226. 69. Løvlien M, Schei B, Gjengedal E. Are there gender differences related to symptoms of acute myocardial infarction? A Norwegian perspective. Prog Cardiovasc Nurs 2006;21:14-19. 70. Kreiner M, Okeson JP, Michelis V, Lujambio M, Isberg A. Craniofacial pain as the sole symptom of cardiac ischemia: a prospective multicenter study. J Am Dent Assoc 2007;138:74-79. 71. Kreiner M, Falace D, Michelis V, Okeson JP, Isberg A. Quality difference in craniofacial pain of cardiac vs.dental origin. J Dent Res 2010;89:965-969. 72. Dougall AL, Jimenez CA, Haggard RA, Stowell AW, Riggs RR, Gatchel RJ. Biopsychosocial factors associated with the subcategories of acute temporomandibular joint disorders. J Orofac Pain 2012 ;26:7-16. 73. Turk DC, Audette J, Levy RM, Mackey SC, Stanos S. Assessment and treatment of psychosocial comorbidities in patients with neuropathic pain. Mayo Clin Proc 2010;85:S42-50. 25 74. Komiyama O, Obara R, Uchida T, Nishimura H, Iida T, Okubo M, Shimosaka M, Narita N, Niwa H, Shinoda M, Kobayashi M, Noma N, Abe O, Makiyama Y, Hirayama T, Kawara M. Pain intensity and psychosocial characteristics of patients with burning mouth syndrome and trigeminal neuralgia. J Oral Sci 2012;54:321-327. 75. Walden A, Parvizi N, Tatla T. Toothache: an unlikely presentation of secondary breast malignancy. BMJ Case Rep. 2011;16:2011. 76. Park SY, Mun SK. Toothache induced by an angioleiomyoma of the nasolabial groove: a case report. J Orofac Pain 2011;25:75-78. 77. Orr TM, Orr DL 2nd. Methemoglobinemia secondary to over-the-counter Anbesol. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2011;111:e7-e11. 78. Kalladka M, Proter N, Benoliel R, Czerninski R, Eliav E. Mental nerve neuropathy: patient characteristics and neurosensory changes. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2008;106:364-370. 79. Zadik Y, Vainstein V, Heling I, Neuman T, Drucker S, Elad S. Cytotoxic chemotherapy-induced odontalgia: a differential diagnosis for dental pain. J Endod 2010;36:1588-1592. 80. Hellmann DB. Temporal arteritis: a cough,toothache,and tongue infarction. JAMA 2002;287: 2996-3000. 81. Kohjiro M, Sato H, Katsuki R, Kosugi T, Takasaki M, Hirakawa N, Totoki T. 26 An effective case of glycerol injection into the trigeminal cistern against trigeminal neuralgia resulting from pontine infarction. Pain Res 2005;20:35-38. 82. Khan J, Heir GM, Quek SY. Cerebellopontine angle (CPA) tumor mimicking dental pain following facial trauma. Cranio 2010;28:205-208. 83. Kang H, Kim JK, Kim Y. Association of cholesterol granuloma and aspergillosis in the sphenoid sinus. Korean J Radiol 2008;9 Suppl:S30-S33. 27 Table 1 Representative causes of nonodontogenic toothache with clinical features, diagnostic testing and a summary for treatment of each entity. Cause of Clinical features Diagnostic nonodontogenic testing toothache (After ruling out Treatment primary dental pathology) Myofascial pain referred Dull, aching, and Provocation of Behavior to tooth/teeth diffuse. Worsened myofascial trigger modification. by masticatory, points and Physical therapy head and neck reproduction of NSAIDs movements. referral patterns. Muscle relaxants Diagnostic TCAs injection eliminates pain. Neuropathi c toothache Episodic Paroxysms are Local anesthesia Carbamazepine is provoked by with topical the first choice, relatively anesthetic oxcarbazepine as innocuous administered at the second choice peripheral the trigger zone and baclofen and stimulation of a intraorally reduces lamotrigine as third “trigger zone” at the episodes of choices intra-oral or paroxysmal pain. 28 extra-oral sites such as the buccal mucosa above the molars, the lips, chin, nares and nasiolabial fold. Pain is described as excruciating, electric-like and brief Continuou Continuous Continuous Neuropathic pain, s persistent pain neuropathic pain such as reported (toothache-like) may be during the acute and associated accompanied by phase of a herpes symptoms sensory zoster infection abnormalities such responds to Paresthesia may be as hypersensitivity valaciclovir reported and/or allodynia. hydrochloride, aciclovir, vidarabine, etc. 29 First–line drugs for other continuous painful conditions include application of topical anesthetics and the oral administration of TCAs or anticonvulsants second-line drugs: nonopioids or SNRI Idiopathic toothache Continuous pain in The most frequent TCAs the teeth and/or somatosensory SDA antipsychotic periodontal tissues abnormalities drugs without objective were topical treatments pathophysiological somatosensory or radiological gain with regard findings at the site to painful of pain, and with mechanical and an unknown cold stimuli and etiology that lasts somatosensory over four or six loss with regard to 30 months. cold detection and mechanical detection Neurovascular Migraine: Migraines: toothache Administered in accordance with the Spontaneous, May accompanied ICHD, and affected throbbing by nausea, patients are referred maxillary pain vomiting, to a neurologist, photophobia, neurosurgeon or phonophobia, etc. headache clinic. Made worse by physical activity Pharmacologic Attacks last 4-72 therapy for hours migraines normally includes acetaminophen and NSAIDs. Triptans are used for the acute phase, and topiramate, valproic acid or amitriptyline as prophylactic treatment. 31 TACs (trigeminal Dysautonomic Oxygen inhalation, aytonomic accompaniments triptans, and cepharalgia): of cluster dihydroergotamine Cluster headaches: headache include were used for lacrimation, abortive therapy, Episodic, intense rhinorrhea, scleral velapamil, periorbital and injection, corticosteroids maxillary pain pupillary miosis, (short term), lasting 15 to 180 as seen in lithium, divalproex minutes 82). Horner’s sodium, and Syndrome. There topiramate were are no signs or used for symptoms prophylactic between therapy 32 paroxysms, although neurovascular toothache may be induced by histamines and/or alcohol TACs: chronic Paroxysmal paroxysmal Acute, episodic hemicrania had a hemicranias (CPH) periorbital and 100% response to maxillary pain indomethacin.Topir associated with amate appears to be dysautonomic promising . features Sinus pain referred to Pain occurs in the Computerized Sinus toothache tooth/teeth maxillary molar tomography (CT) patients are referred teeth induced by and to an cold stimulation or histopathological otorhinolaryngologi mastication, and examinations st dysesthesia arises showing sinusitis with tooth or malignant 33 Decongestants may clenching fibrous be helpful. histiocytoma Cardiac pain referred to “Tight” and Reduction of pain Echocardiogram tooth/teeth “burning” is observed Refer to the following the cardiologist. induced by administration of Treatment includes exercise, sublingual tablets anti-angina drugs improvement with of glyceryl (beta-adrenorecepto rest, bilateral trinitrate r blockers, nitric Aggravation symptoms acid, etc.) and antithrombotic drugs . Psychogenic toothache An inconsistent site Referral to a neuropsychiatrist, mental or toothache of of pain in the health professional or liaison treatment psychosocial origin anatomical specialist. Treatment may include innervation area, pharmacological therapy (antidepressant bilateral symptoms, or antipsychotic drugs, etc.) continuous and persistent pain 34