Evaluation of vertical and sagittal position of maxillary first molar in various skeletal types.

Abstract

Aim : To evaluate factors affecting the sagittal and vertical position of maxillary first permanent molar in Class I and Class II division 1 malocclusions . Method : The pre-treatment lateral cephalograms of sixty patients were divided into 2 study groups i.e. Group 1 (Class I subjects) – Angle’s Class I molar relation, with ANB =0-40 with normal overjet and Group 2 (Class II division 1 subjects) – Angle’s Class II molar relation, ANB > 40 with overjet > 4mm. Linear & angular measurements e.g.  Cranial base length, Maxillary length , Maxillary location, Upper anterior face height, Posterior face height, Sagittal and Vertical position of maxillary first molar, Palatal plane angle , Mandibular plane angle,  Interjaw angle and Cant of occlusal plane were made on tracings. Statistical analyses included calculation of linear correlation coefficients and student’s t-test to correlate these parameters. Results and Conclusion: The sagittal & vertical position of maxillary first molar remained same in Angle’s Class I and Class II division 1 malocclusion. In Angle’s Class I malocclusion, maxillary first molar was located more forward with increased maxillary length and its height increased with increase in upper anterior face height and posterior face height. In Angle’s Class II division 1 malocclusion, maxillary first molar was located more forward with increase in maxillary length as well as posterior face height while it was located more posteriorly with a steeper cant of occlusal plane and maxillary first molar height increased with increase in maxillary length as well as posterior face height and decreased with steeper cant of occlusal plane