Objective: To observe dentofacial three-dimensional changes after maxillar retraction with zygomatic implant anchorage in rhesus monkeys. Methods: 4 young male rhesus monkeys were employed. Maxillar retraction was performed with zygomatic implant anchorage in 3 monkeys( 1 for 1.5 month and 2 for 3 month observation), 1 without treatment was used as the control. Spiral CT images were used to analysis the dentofacial three dimensional changes after the retraction. Results: There was obvious sagital backward movement in upper dentition, about 2.5 mm in 1.5 month test group and more obvious sagital backward movement in both upper dentition and maxilla in 3 month test group. The vertical and horizontal positions did not change obviously in both upper dentition and maxilla.ANS-PNS plane rotated clockwise slightly. 0.98° in 1. 5 month test group and 1.39° in 3 month test group respectively. Conclusion: Zygomatic miniplate implants can be utilized as the stable and effective anchorage not only to inhibit maxilla from growing forward but also to retract maxilla distally with slight rotation.%目的:运用螺旋CT三维重建评价颧骨种植体支抗向后牵引猴上颌骨对颅颌面三维方向的矫形作用.方法:选用生长发育期恒河猴4只,3只用于研究(1只牵引1.5月、2只牵引3月),1只作为对照;实验前后分别行CT扫描及三维重建,测量各标志点的变化,分析颅颌面三维方向的矫形作用.结果:与对照组相比,1.5月组主要表现为上牙弓矢状向的变化,后移约2.5 mm,垂直向、水平向均无明显变化;3月组上牙弓矢状向变化更为明显,后移约3.8 mm,上颌骨后移约2.5 mm.硬腭平面相对于前颅底平面发生轻度顺时针旋转,1.5月时为0.98°,3月时为1.39°.结论:颧骨微钛板种植体支抗能有效后牵引上颌骨及上牙弓、抑制上颌矢状向发育,垂直向及水平向改变不明显.
展开▼
