2009 年 22 巻 2 号 p. 115-121
It is important to recognize the posterior superior alveolar artery (PSAA) in the lateral wall of the maxillary sinus when planning the sinus floor augmentation procedure. The aim of this study was to characterize the prevalence and vertical position of PSAA running in the posterior alveolar canal. The studied samples consisted of 208 areas of 113 patients who underwent CT examination prior to the implant surgery. Analysis was performed by coronal CT images. Four areas were observed:the area of the inferior crest of the zygomatic process (Z-area), 5 mm forward of the Z-area, and 5 mm and 10 mm behind the Z-area.
The results were as follows:
1.The prevalence of the posterior alveolar canal on CT images was the lowest in the Z-area.
2.The vertical measured point of the posterior alveolar canal was the lowest in the Z-area.
3.The vertical distance between the maxillary sinus floor and the posterior alveolar canal was 8.5±4.8 mm at the area 5 mm forward of the Z-area (the area where the lateral window technique is adopted).
4. The vertical distance between the alveolar crest and the posterior alveolar canal was 16.2±4.0 mm at the area 5 mm forward of the Z-area.
These data results will be useful for the sinus floor augmentation procedure.
