Sliding genioplasty is a versatile procedure. It allows a three dimensional reposition of the chin. Inferior reposition, especially greater movements (< 5 mm), is associated with higher rates of complications, including malunion and relapse. The use of interpositional grafts is considered the standard procedure in these cases. However, the type of the material to be interposed is still controversial.
The objective of this study is to evaluate the use of mastoid bone autograft as an interpositional grafting material for sliding genioplasty to correct vertical deficiency of the chin.
We studied 8 patients that underwent sliding genioplasty to correct vertical deficiency with mastoid bone interpositional graft. Data collected were: dentofacial deformity, surgical technique, patient satisfaction, and complications. Panorex, lateral, and frontal cephalogram and computed tomographic scans have been performed for each case preoperatively and 12 months after surgery.
Age ranged from 18 to 45 years (mean 27.8 years); 6 female and 2 male. Stable aesthetic and functional results were observed in all cases. No infections occurred. No bone resorption has been clinically or radiologically observed. With regard to complications, 1 patient presented paresthesia in the region of the inferior alveolar 6 months after surgery; 1 patients developed hemotympanum that resolved in no more than 30 days. No patient needed reoperation.
Mastoid bone presented as a good site for interpositional graft for sliding genioplasty with inferior reposition greater than 5mm. It has the advantage of virtually no donor site morbidity. No signs of relapse and malunion were present in this study.