When the patient returns for implant placement (2nd visit after initial exam), he reveals that he is a dental phobic.  He requests placement of 4 implants in the upper left quadrant, instead of 2.  Narrow ridge is unexpected in the canine and premolar area (Fig.1).术前没有拍摄CT，手术时意外发现尖牙，前磨牙牙槽嵴狭窄（图一）。

1-Piece Implants for Maxilla Last Next

Xin Wei, DDS, PhD, MS 1st edition 09/27/2015, last revision 02/09/2021