螺旋CT分析颧颊翼种植体义颌颧区种植方向和部位

目的为上颌骨大型缺损后行颧颊翼种植体义颌修复时,颧区种植的植入部位及方向提供客观依据。方法通过50例有牙列的单侧正常颧骨的螺旋CT影像三维重建,在矢状位截面影像上测量颧骨的前后倾斜角度;在冠状位截面影像上观察颧骨的形态并测量上颌牙槽嵴最颊侧点到上颌窦最外侧点的水平距离。结果颧骨的前后倾斜角度平均为80.03°,即颧骨前倾9.97°;48例颧骨冠状位影像形态较直,2例明显弯曲;上颌牙槽嵴最颊侧点到上颌窦最外侧点的水平距离为6.77mm。结论一般情况下,种植体前倾10°左右植入能最充分地利用颧骨的上部骨量。但由于个体差异,建议修复前先行螺旋CT影像学检查,评估颧骨的形态和骨量,以提高种植的安全性和有效性。

Position and orientation of zygomatic-area implant of zygo-buccal flange ossointegrated implant obturator

OBJECTIVE: To provide objective data for position and orientation of zygomatic-area implant used in zygo-buccal flange ossointegrated implant obturator for patients with large maxillary defect. METHODS: Fifty cases of normal unilateral zygomatic body with dentition were measured on three-dimensional spiral CT images. Measurements included the slope angle of zygomatic body on sagittal sectional image, the maximal horizontal distance from the buccal boundary of maxillary alveolar to outboard of maxillary sinus. Furthermore, the configuration of zygomatic body was observed on coronal sectional image. RESULTS: The average rearward slope angle of zygomatic-body was 80.03 degrees. Forty-eight cases showed straight zygomatic-body configurations and two cases quite curvy. The maximal horizontal distance from the buccal boundary of maxillary alveolar to outboard of maxillary sinus was 6.77 mm. CONCLUSIONS: In a normal condition, implants can be upright inserted tilting about 10 degrees ahead to utilize much zygomatic bone-volume in high site. In order to improve security and validity of implantation, it is better to take spiral CT examination to evaluate the bone volume and shape of zygomatic body before zygomatic-area implant.