RESUMO
Objective To explore a new modified stable genioplasty with modified MortiseTenon joints technique and to analyze the surgicaI results in clinic as well as to discuss the advantages in theory.Methods Eleven patients were performed by the genioplasty with Mortise-Tenon joints technique intraoral approach from June 2012 to March 2014,who were suffered from retrusion of chin with different degree accompanying with long chin.The two segments of the chin by osteotomy were made into the Mortise-Tenon joints and fixed by titanium plates.The results were evaluated by clinical appearances and image analyses.Results All 11 patients were satisfied with the procedure and the contour of the chin.The surgical effects were stable without any complications.The advancement in average Mortise-Tenon joints technique was 7.38 mm.Conclusions Much better in stablility and less relapse are achieved by using modified Mortise-Tenon joints technique;furthermore,the genioglossal muscle and geniohyoid muscle are reserved as much as possible,and therefore the normal function of them could be maintained.This method is a good alternative technique for chin retrusion coexisted withlong chin.