微笑線 Smiling line

 

 

 

 

 

There are certain lines to be parrell to

 

 

 

 

 

The upper front teeth edge line parrell to lower lip upper line

 

 

 

 

  切端處理前 before edge shaping

 

 

 

 

切端處理後 after edge shaping

門牙切緣線平行於下唇上緣線