Sawada Kosaku, Nakahara Ken, Matsunaga Satoru, Abe Shinichi, Ide Yoshinobu
Department of Anatomy, Tokyo Dental College, Chiba, Japan.
Clin Oral Implants Res. 2013 Aug;24 Suppl A100:1-7. doi: 10.1111/j.1600-0501.2011.02354.x. Epub 2011 Oct 20.
The purpose of this study was to evaluate the interradicular cortical bone thickness, alveolar process width and root proximity for planning mini-implant placement in the maxillary alveolar process.
Eighty maxillae (right and left sides) of 40 Japanese adult skulls were examined. The samples were imaged and measured using a micro-CT system. Buccal and palatal interradicular cortical bone thickness, alveolar process width, and root proximity were measured in six interradicular sites from distal of central incisor to mesial of second molar. Buccal and palatal interradicular cortical bone thickness and alveolar process width were measured at 10 different vertical levels. Root proximity was measured at four different vertical levels.
Buccal and palatal interradicular cortical bone thickness and alveolar process width tended to increase from crest to base of alveolar process. The buccal interradicular cortical bone thickness between canine and first premolar or between first premolar and second premolar was the greatest, and between central incisor and lateral incisor was the least. The palatal interradicular cortical bone was significantly thicker than the buccal. The root proximity between second premolar and first molar or first premolar and second premolar was the widest and between central incisor and lateral incisor it was the narrowest.
The findings of this study suggest that recommendations when low dose 3D multislice CT or low dose cone beam imaging is not available, the results of this research may be useful in providing indicators for selecting the design of the placement site.
本研究旨在评估上颌牙槽突中根间皮质骨厚度、牙槽突宽度和牙根间距，以便为微型种植体在上颌牙槽突中的植入制定计划。
对40具日本成年颅骨的80块上颌骨（左右两侧）进行检查。使用微型CT系统对样本进行成像和测量。在从中央门牙远中至第二磨牙近中的六个根间部位测量颊侧和腭侧根间皮质骨厚度、牙槽突宽度和牙根间距。在10个不同的垂直层面测量颊侧和腭侧根间皮质骨厚度及牙槽突宽度。在四个不同的垂直层面测量牙根间距。
颊侧和腭侧根间皮质骨厚度及牙槽突宽度从牙槽嵴顶至牙槽突底部有增加趋势。尖牙与第一前磨牙之间或第一前磨牙与第二前磨牙之间的颊侧根间皮质骨厚度最大，中央门牙与侧切牙之间的厚度最小。腭侧根间皮质骨明显比颊侧厚。第二前磨牙与第一磨牙之间或第一前磨牙与第二前磨牙之间的牙根间距最宽，中央门牙与侧切牙之间的牙根间距最窄。
本研究结果表明，在无法获得低剂量三维多层CT或低剂量锥形束成像的情况下，本研究结果可能有助于为选择种植位点设计提供指标。
