The Effect of Lengthened Mandibular Ramus on Relapse After Orthognathic Surgery

The establishment of normal jaw function, acceptable facial esthetics, and long-term stability are the main goals of a successful orthognathic procedure. Postoperative relapse is the most common complication after the orthognathic surgery. Relapses have been attributed to condylar positioning and proximal segment rotation, counterclockwise rotation of the distal segment, degree of mandibular advancement, and stretching of the pterygomasseteric sling and other soft tissues

The movement inducing the ramus to be lengthened, causing elongation and tension of the pterygomasseteric sling, has relatively higher relapse rate. But the studies about how much lengthening of mandibular ramus affects the relapse are rare.

The purpose of this study is to evaluate the effect of lengthening of mandibular ramus to postoperative relapse after orthognathic surgery through analyzing pre and postoperative cephalometric radiographs of the patients treated in our department for the correction of the dentofacial deformities

Reference

1. Postoperative skeletal stability following clockwise and counter-clockwise rotation of the maxillomandibular complex compared to conventional orthognathic treatment

J.P. Reyneke, R.S. Bryant, R. Suuronen, P.J. Becker

British Journal of Oral and maxillofacial surgery 45(2007)56-64

2. Relapse after SSRO for mandibular setback movement in relation to the amount of mandibular setback and intraoperative clockwise rotation of the proximal segment

Jeong Joon Han, Hoon Joo Yang, Shin-Jae Lee, Soon Jung Hwang

Journal of Cranio-Maxillo-Facial Surgery xxx(2013)1-5