• Nattawat Triviroj D.D.S.
• Sirima Petdachai D.D.S., Ph.D (Orthodontics), Thai Broad of Orthodentics
• Wichitsak Cholitgul B.Sc., D.D.S., Diplomate, Thai Broad in Oral Diagnostic Science

Objective To investigate characteristics of skeletal Class III malocclusion in a group of Thai subjects
and compare the difference between genders.

Materials and methods Using digital lateral cephalometric radiographs of 223 skeletal Class III
malocclusion patients according to the Sassouni analysis (78 males and 145 females) and used T-test
and Chi-square for statistical analysis

Results Most of the Thai subjects in this study have normal (49.78%) or retrognathic maxilla (49.33%),
prognathic mandible (82.51%), skeletal openbite (66.81%) and upper anterior tooth protrusion (58.74%).
When compared between genders, the results significantly show that males have cranial base length,
corpus length and anterior and posterior facial height longer than females (p value = 0.05).

Conclusion Both Thai males and females patients in this study have no difference in skeletal pattern
but males have such bigger dimension than females.

(CU Dent J. 2013;36:1-8)