Introduction
Orthognathic surgery was reported to improve facial age. However, change of perceived age may differ in different type of malocclusion due to variable cephalometric characteristics, surgical design of skeletal movements, and soft tissue responses. This study aimed to analyze age perception after orthognathic surgery in different Angle’s classification of malocclusion as well as its correlation with cephalometric measurements.

Methods
Patients of different classification of malocclusion undergoing orthognathic surgery by a single plastic surgeon were selected for analysis. Pre-operative and post-operative photos were collected and rated by 2 plastic surgeons. Perceived age of different type of malocclusion and relation with cephalometric measurement were assessed.

Results
Patients in both groups look elder than actual age before operation (+2.59 years old in class II, p=0.03; +5.56 years old in class III, p<0.001). However, patients of class III malocclusion were observed with significant decreased age discrepancy after operation (-1.46 years old, p=0.004). Among factors that might influence the age discrepancy. Age at the operation was found to have significant effect in class III malocclusion (p=0.002) and change of ANB angle after operation was also found to be related with age reduction effect in class III malocclusion. (p=0.047)

Conclusion
The results demonstrated the impacts of Angle’s classification and cephalometric measurement on perceived age after orthognathic surgery. This could provide objective data of the appearance change for patients seeking for orthognathic surgery.