[Position and orientation of zygomatic-area implant of zygo-buccal flange osseointegrated implant obturator].
OBJECTIVE
To provide objective data for position and orientation of zygomatic-area implant used in zygo-buccal flange osseointegrated 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.
Zhao
Liang-liang
LL
Department of Prosthodontics, Hangzhou Stomatological Hospital, Hangzhou 310002, China.
Hong
Liu
L
Hou
Zhen-ya
ZY
D000293:Adolescent; D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D019931:Maxillofacial Prosthesis Implantation / Q000379:methods*; D008875:Middle Aged; D036542:Tomography, Spiral Computed; D055815:Young Adult; D015050:Zygoma / Q000000981:diagnostic imaging* / Q000601:surgery