[Zygomatic reduction with midface L-shaped osteotomy and its effect on the maxillary sinus].

Objective: To investigate the result of zygomatic reduction with midface L-shaped osteotomy through intraoral approach.
Methods: From June 2006 to Aug. 2009, 67 cases received zygomatic reduction with midface L-shaped osteotomy through intraoral approach. 52 cases underwent CT scan before operation and 12 months after operation. The images were analyzed by software GE AW 4.1 for evaluation of clinical effect, maxillary sinus change and complication. SAS 6.12 software was applied for one-way ANOVA.
Results: Satisfactory results were achieved in all the patients. The volume of maxillary sinus at left and right side was (21233.96 +/- 4455.04) mm3, and (22020.64 +/- 3663.82) mm3, respectively before operation: (17840.91 +/- 4381.03) mm3 and (18511.85 +/- 3466.24) mm3 respectively 12 months after operation, showing a significant difference between them (P<0.05). No infection or dental pulp necrosis happened.
Conclusions: Good results can be achieved with intraoral L-shaped osteotomy for zygomatic reduction. Exposure of maxillary sinus would not cause any complication.