Aim: The objective of the study is to evaluate the anterior and posterior mandibular dental height in class I and class II malocclusions using two stable structure of Bjork (inner contour of the cortical plate of the mandibular symphysis and contour of the mandibular canal). Furthermore, it is intended to compare with the mandibular plane. Methods: Fourty five cases of Angle’s Class I, Class II division 1 and Class II division 2 malocclusions with age group of 13 to 17 years were selected and equally divided into three groups. The data of pre and post-treatment lateral cephalograms were obtained for the comparison of anterior and posterior mandibular dental height using mandibular plane (Go-Me) and a plane from most postero-inferior point on contour of the mandibular canal (C) to inferior most point on the inner contour of the cortical plate of the mandibular symphysis (Sm).P re and post treatment mandibular dental height changes were evaluated and compared using paired t test. Result: Pre and post treatment mandibular dental height measured from mandibular plane showed significant changes at posterior region, whereas anterior mandibular dental height (ADH) changes were not significant. Similarly, pre and post treatment mandibular dental height measured from CSm plane showed significant changes for posterior mandibular dental height (PDH), but ADH changes were not significant. Comparison of mandibular dental height measured from mandibular plane and CSm plane showed significant differences in both anterior and posterior region for all malocclusion groups except ADH in Class II division 2 malocclusion. Conclusion: Mandibular dental height measured from mandibular plane and CSm plane showed significant changes which suggest bone remodelling changes might have occurred at the lower border of the mandible.
Key words: Bjork’s stable structure, Dental height, Malocclussion, Mandibular Plane.
Received: 12 October 2018 Revised: 2 November 2018 Accepted: 5 November 2018
Corresponding author: Dr. Vasanthan P, MDS., 19-3D; ARRS apartment, Greenways road, Fairlands, Salem – 636016
This article may be cited as: P Vasanthan , Mohan J, J Sabarinathan, S Sabitha, JJ Sathiya. Evaluation of Mandibular Dental Height Using Stable Structure of Bjork – A Comparative Cephalometric study. J Adv Med Dent Scie Res 2018;6(11):1-4.