[摘要] 目的：探讨微型种植体作为正畸支抗在压低磨牙中的应用。方法：选择5例需要压低磨牙的患者(包括3例开牙合患者和两例因对牙合牙缺失而致磨牙伸长的修复前正畸患者)，使用微型种植体作支抗压低磨牙，治疗前后拍摄头颅侧位定位片，测量比较磨牙在矫治前后的压低量。结果：矫治结束后开牙合患者前牙达到正常的覆牙合覆盖，修复前正畸患者矫治至缺牙区能进行常规修复。磨牙平均压低31mm。结论：应用种植体作支抗能有效地压低磨牙，为某些错合畸形的矫治提供了新思路。
[关键词] 微型种植体 支抗 磨牙压低
Applications for micro-implant anchorage lower molars
Feng Yao
(Chencun Shunde District of Foshan City in Guangdong Foshan Stomatological Hospital 528313)
[Abstract]Objective: To show the efficiency of mini-screw implants as anchorage for molar intrusion Methods: Three patients with anterior open-bite and two patients with extruded molars were treated with mini-screw implants as anchorage for molar intrusion Lateral cephalograms were taken at the beginning and the end of the treatment The movement of molars in vertical dimension were analyzed Results：In open-bite patients overjet and overbite were corrected, and the molars were average intruded 31mm Conclusion：To intrusion molar，mini-srcew implant is an effective method
[Key words] Mini-screw implant Anchorage Molar intrusion
对于浅覆牙合、开牙合、长面型、唇部丰满度欠佳的患者，在矫治过程中控制磨牙的升高显得尤为重要，如果在治疗计划中将增加覆牙合作为目标之一，则需要在治疗过程中将磨牙压低。使用常规的手段，由于作用力与反作用力的原理，压低力作用于被压低磨牙，必然在其它牙上产生一个伸长的力；通常会将支抗设计在双尖牙上，伸长双尖牙的结果同样会减小覆牙合，增加下面高，减少唇部丰满度，如此看来，并没有真正达到压低磨牙的效果，所以支抗不足会使治疗效果打折扣。
若后牙因龋病或其它原因而早失且未能及时修复，就会出现一系列的问题：邻牙倾
