Dental Pulp Diagnostic Dr. Csaba Dobó Nagy Department of Oral Diagnostics Pulp conditions • normal when there is a response to the stimulus provided be the sensibility test and this response is not pronunced or exaggerated,and it does not linger • Pulpitis is present when tehere is an exaggerated response that produse pain. Pulpitis can be considered as reversible or irreversible, depending on the severity of pain and whether the pain lingers or not. • Pulp necrosis: the tooth is pulpless or has had previous root canal therapy Diagnostic objectives of pulp testing • Assesment of pulp health based on its qualitative sensory response – Prior to restorative, endodontic and orthodontic procedures – As a follow-up and for monitoring the pulp after trauma of the theeth – In different diagnosis, such as excluding periapical pathosis of pulp origin • Replication of sympthoms and triggers of pain diagnostic purposes: – To localise the source of pain – As an aid in excluding nonodontogenic orofacial pain Definition • Pulp Vitality Testing: Assesment of the pulp’s blood supply • Pulp Sensibility Testing: assesment of the pulp’s sensory response • Pulp Sensitivity : condition of th pulp being very responsive to a stimulus Pulp Testing Techniques/Pulp Senibility Testing • Thermal Tests – Cold tests: • Ice • Refrigeant Spray (chlor-etil, dichlor-difluorometaneDDM, tetrafluoro-etane TFE) • Carbon-dioxide snow – Heat test • Warm gutta-percha • Touch and heat • Electric pulp test • Test cavity preparation Pulp Vitality Testing 3. Other: • Photoplethysmography : to improve pulse oximetry , by adding a light with a shorter wavelength • Spectrophotometry: dual wavelength lights • Transmitted Laser Light (TLL): separated sending/receiving probes • Transillumination: colour changes that may indicate pulp pathosis • Ultraviolet light photography: fluoresens patterns • Surface temperature measurment (breathing) Comparison of pulp testing • Cold tests – Rate of temperature decrease: CO2 in 5 sec. 2°C, • Heat tests – melting point of Guttapercha between 78°C -150°C, but 11°C increase cause damage in the pulp • Electric pulp tests – In recently erupted teeth it takes 5 years myelinated (Aδ) fibres reach DEJ – Orthodontic movement sensory functions may be disturbed up to 9 months – 2-6 weeks recovery following trauma – Contamination (ginigva, metal restauration) Types of Nerve Fibres and their distribution inside the dental pulp • Dental pulp is a highly innervated tissue that contains sensory trigeminal afferent axons • N trigeminal sensory nerve fibers – 90% of A fibres are A –delta fibres , which are located at the pulp-dentin border in the coronal portion of the pulp and concentrated in the pulp horns – C fibres are located in the core of the pulp and extend into the cell –free zone underneath the odontoblastic layer • Symphatetic efferent fibres regulate the blood flow Pulp tests and innervation • Electric current simulates Aδ-fibres, but not the C-fibres, because their high treshold. • Cold simuli produce stronger response than cold stimuli, because of the outward flow of fluid. • Repeated application of cold will reduce the displacement of fluid – less painful. • Aδ-fibres are more affected by the reduction of blood flow than C-fibres, because they more sensitive to hypoxia. • Uncontrolled heat can injure pulp release mediators that affect the C-fibres. Positive/negative hydrostatic pressure +150 Hgmm -150 Hgmm Neuro-parakrin inflammation normal pulp + - - inflamed pulp ++ - - Comparison of pulp tests Etilchloride warm Electric test guttapercha senzitivity 0,83 0,86 0,72 specificity 0,93 0,41 0,93 Recovery of traumatic teeth function Test 0. day pulzus oximetry Electric test 100% 100% 0 29,4% 82,35% 94,11% 0 29,4% 82,35% 94,11% Heat test 28. day 2 month 3 month 100% 100% Faults of electric pulp test • False-negative • False-pozitive • Localization: – Incizal third – Molars, premolars neck – EKG gel Determination of pulp circulation • Yet no available clinical test • Senzibility tests 84-90% reliable for pulp vitality. • Fals-pozitive: remaining C-fibres • Fals-negative: – Calcification – recent trauma – developing tooth Differentiation of reverzibilis/irreverzibilis pulpitis Small area dentin-recording microdialysis bradikin ↑10x gyulladt pulpában JOE, 2000;26:744 Special clinical cases • Dentin hypersensitivity • Pulpitis chronica • Pulp-perio irreversibilis pulpitis? Pulpitis chronica