安格式第二級第二分類咬合異常成人病患拔牙與否之齒顎矯正治療－－病例報告

Extraction or Non extraction Treatment of Class II Division II malocclusion adult patients – Cases Report

安格式第二級第二分類咬合異常為臨床上較為罕見之病例，此類病例通常具有上顎正中門牙內傾，很深的垂直覆蓋等表徵，顏面外觀上因為下巴較為明顯，而有相對內縮的唇形。拔牙治療可能會造成唇形更為內縮，所以選擇是否需要以拔牙來做治療要格外謹慎。本文提出兩個病例探討拔牙與不拔牙的兩種治療計畫，在治療上的考量。

The cases of Angle Class II Division 2 malocclusion are rare in the population. These cases are characterized by retroclined upper anteriors and deep overbite. Facial profile have relatively retrusive lips as well as prominent chins. Extraction of premolars followed by incisor and lip retraction will further retrude the lips. So decided the extraction treatment plan of these patient requires careful diagnosis. In this case report, we will discuss the considerations of extraction or non-extraction treatment of Class II division 2 malocclusion.