Year : 2022

Volume : Volume 13

Issue : Issue 5

Address for correspondence :
: Dr. Parth M. Raviya
pmr22389@gmail.com

Abstract

Aim: The aim of the study was to evaluate the pattern of lingual split line when performing a bilateral sagittal split osteotomy (BSSRO) with different osteotomy methods. Materials and Methods: A total of 30 dry cadaveric mandibles were taken for the study. The classical Obwegeser and Dal Pont technique in the left side and additional inferior border osteotomy cut in the right side of BSSRO were compared based on modified lingual split scale. The maximum torque force that was needed to split the mandible was recorded and the fracture pattern was observed. Similar osteotomies were performed in 30 goat mandible which acted as control group. Results: The cadaveric dry mandible recorded an average torque of 14.8 +4.6 Nm with a maximum of 1.0 Nm and a minimum of 10.0 Nm in the left side. About 80% of the mandibles were Type I fracture pattern and 20% had Type III fracture pattern. In contrast with the modified BSSRO technique with an additional inferior border, osteotomy required a maximal torque of 14.0 N and a minimal torque of 7.0 with an average required torque of 10.9 + 4.2 N on the right side of the mandible. About 93% of the cases split by Type II fracture pattern in the modified BSSRO technique. In goat mandible, Obwegeser and Dal Pont recorded an average torque of 18.7 N + 4.10N and modified BSSRO technique in the right side recorded an average torque of 10.4 N + 4.10 N. Conclusion: The new technique resulted in predictable splitting of the mandible along the lower border away from the mandibular canal (Type II) and also decreased the force needed to complete the osteotomy by 31% when compared to the Obwegeser and Dal Pont BSSRO technique.

Keywords: Bilateral sagittal split osteotomy, Cadaveric mandible, Inferior alveolar nerve, Modified lingual split scale.