Surgical Correction of Asymmetric Mandibular Prognathism with Modifi ed Bilateral Sagittal Split Osteotomy Technique: A Clinical Study.

ABSTRACT

Introduction: An asymmetrical face consists of multitude of the minor asymmetrical component, the mandibular component being most common. The asymmetric mandibular prognathism (AMP) is one of the most common forms of asymmetry caused by genetic and epigenetic factors and environmental condition such as trauma, functional deviations due to dental interference. The present study was undertaken to assess the effi cacy of a modifi ed bilateral sagittal split osteotomy (BSSO) technique in correction of AMP. Purpose: The purpose of the study was to investigate the skeletal stability and changes of proximal segments position postoperatively following surgical correction of AMP with modifi ed BSSO technique and analyze the effect of such changes on the incidence of signs and symptoms of temporomandibular joint (TMJ) disorders. Materials and Methods: Patients with AMP were included in the study. All the patients underwent surgical correction by modifi ed BSSO technique. The patient clinical and cephalometric fi ndings (pre-operative, immediate post-operative, and 6 months postoperatively) were recorded in a proforma and subjected to statistical analysis. Results: A total of six (n = 6) participated in the study. Five out six patients had pre-existing TMJ problems. In lateral cephalogram, the mean mandibular setback of Point B was 7.75 mm. In frontal cephalogram, the mean mandibular deviation decreased 2.55 mm after surgery. Minimal relapse was noted 6 months post-operatively suggestive of good skeletal stability with minimal complications. Conclusions: The modifi ed BSSO technique was effective in the treatment of AMP.