Establishing the Cephalometric Values for Tetragon Analysis in Patients with Class I Occlusion: A Cephalometric Study.

OBJECTIVES Proper application of the cephalometric norms for tetragon analysis for better understanding, diagnosis, and management of dentofacial deformities in the ethnic population. MATERIALS AND METHODS A total of 204 subjects, inclusive of males (102) and females (102), were selected randomly from the outpatient department of Saveetha Dental College and Hospitals, in the age group ranging from 18 to 25 years, fulfilling the inclusion criteria. Assessment of each lateral cephalogram was done using tetragon analysis to evaluate the cephalometric values for individuals with class I occlusion using the FACAD(®) 3.4.0.3 A software. RESULTS Statistically significant differences were found for all parameters between the ethnic population and the Caucasian norms. Four out of 14 parameters were found to be significantly different between male and female in the ethnic population. CONCLUSION This study indicates that the local ethnic population have more prognathic maxillary and mandibular jaws, converging tendency of the jaw bases (resulting in reduced lower anterior facial height and horizontal growth pattern) as indicated by the analysis done in the tetragon and the trigon, and increased proclination of the upper and lower incisors.