关键词: 锥形束CT, 上颌, 牙槽突, 颊舌向倾角

Abstract:

Objective    To measure the anatomic buccolingual angulation values of the maxillary alveolar process based on CBCT images in order to form a basis for the implant treatment planning， including the design of implant position and angulation. Methods    A random sample of 51 CBCT images were selected and analyzed. The NewTom 5G CBCT data sets were reformatted at a 0.5-mm spacing， with the inferior border of the region of interest parallel to the occlusion plane of maxillary teeth. Twenty-four buccolingual cross-sectional images of the maxillary alveolar process were obtained for buccolingual angulation measurements. Results    Mean or median values of the buccolingual angulation of maxillary alveolar process ranged from about 0 degree to more than 40 degrees. Cross-sections distal to the premolar region showed a statistically higher proportion of vertical process （angulation equals to 0 degree）， compared to cross-sections corresponding to maxillary premolars and anterior teeth region （P < 0.05）. There were no statistical differences between the angulation of alveolar process both from the right side and left side and from males and females patients （P > 0.05）. Conclusion    The buccolingual angulation of maxillary alveolar process decreases from anterior teeth region through the premolars region to the molars region， with the lateral incisor and canine region being the most inclined bucally and a high proportion of the molars region being nearly vertical. Knowing average values of buccolingual angulation of maxillary alveolar process before dental implantation may help the clinician plan the position and orientation of implants， especially when an implant surgical template is not available.

Key words: cone beam computed tomography, maxilla, alveolar process, buccolingual angulation