نموذج للملخصات البحثية إنجليزي: 1مرفق Title Tooth size and anterior ratio in skeletal Class III subjects with mandibular prognathism Authors L. Baidas, N. Al-Jasser Contact lnfo email@example.com, Telephone # 4784524 Ext 391 Department Pediatric Dentistry and Orthodontics (POS) Major Orthodontics citation Egyptian Dental Journal; 51(2): 653-659 Year of Publication 2005 Publisher Egyptian Dental Association Sponsor King Saud University Type of Publication Article in Scientific Periodical Specialized Journal ISSN 0070-9484 URI/DOI http://www.eda-egypt.org/index.php?q=node/1762 Full Text (Yes, No) No Key words Tooth size discrepancy; Bolton analysis; mandibular prognathism Abstract Objective: The objectives of this investigation were to describe the prevalence of anterior tooth size discrepancies in Skeletal Class III with mandibular prognathism, and whether sexual dimorphism exists for anterior tooth size ratios. Methods: The measurements were obtained from 40 study models with both sexes (19 female, 21 male). All patients were Saudi nationals, between the ages of 19 to 30 years old. Descriptive statistics and t-test were used for the analysis of the data. Results: Subjects having skeletal Class III with mandibular prognathism showed highly significant anterior ratio (80.6 +2) compared to the Bolton Study (P<0.001), a high prevalence of anterior tooth size discrepancy, no sexual dimorphism and significant difference in some mesiodistal tooth size difference between sexes. Conclusion: Tooth size analysis is an important diagnostic tool and should be included as one part of the records when establishing treatment planning.