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VOLUME 22 , ISSUE 9 ( September, 2021 ) > List of Articles


Management of Class II Hyperdivergent Mandible by Surgically Altering Occlusal Plane Pattern through Counterclockwise Rotation of Mandible

Balaguhan Balasubramanian, Neelakandan Ravanasamudram Sundaram, Srinivasan Boovaraghavan, Raja Sekar Gali, Sudhakar Venkatachalapathy, Kirthika Natarajan

Keywords : BSSO, Class II hyperdivergent mandible, Counterclockwise rotation of mandible, Occlusal plane alteration

Citation Information : Balasubramanian B, Sundaram NR, Boovaraghavan S, Gali RS, Venkatachalapathy S, Natarajan K. Management of Class II Hyperdivergent Mandible by Surgically Altering Occlusal Plane Pattern through Counterclockwise Rotation of Mandible. J Contemp Dent Pract 2021; 22 (9):1048-1054.

DOI: 10.5005/jp-journals-10024-3146

License: CC BY-NC 4.0

Published Online: 06-01-2021

Copyright Statement:  Copyright © 2021; The Author(s).


Aim and objective: To evaluate the facial esthetic of class II hyperdivergent mandible by altering the high mandibular plane angle into an orthognathic mandibular plane angle by counterclockwise (CCW) rotation of the mandible. Materials and methods: Five patients with class II hyperdivergent mandible were selected for this study. Initially, preorthodontics was done by aligning the teeth. Then, surgically, bilateral sagittal split osteotomy (BSSO) advancement with CCW rotation of mandible with a posterior open bite of 4 mm was done. Eleven linear and 11 angular measurements were taken. Pre- and postsurgical values were evaluated by composite cephalometric analysis, and the changes in the occlusal plane and facial height were statistically analyzed by using paired t-test. Jarabak ratio was calculated for facial height measurements. Further finishing will be done by postsurgical orthodontic procedures to get functional occlusion. Results: Change in occlusion to class I is seen in values of Jarabak ratio and Go-Gn. Jarabak ratio shows an increase in posterior and decreases in anterior facial height. Go-Gn, which implies the CCW movement of the mandible, has reduced the anterior open bite and created a posterior open bite of 4 mm for the supraeruption of teeth. Conclusion: BSSO with CCW rotation of mandible with a posterior open bite has conservatively involved in single-jaw surgery, thereby improving the facial esthetics of all the patients taken this study. Clinical significance: This innovative method of CCW rotation of mandible with open bite mainly prevents the bi-jaw surgery, improves the stability, and gives an esthetically good appearance.

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