自攻型正畸微种植体即刻负载的组织学研究

Research on self-drilling miniscrew implants with immediate orthodontic loading

目的探讨自攻型微螺旋种植体即刻负载持续水平力的可行性及周围骨组织的反应。方法28枚自攻型钛合金微螺旋种植体置于2只犬上下颌骨颊侧的牙根间区。20枚种植体即刻负载约2N持续水平力9周,作为实验组;8枚没有负载的作为对照组。光学和荧光光学显微镜检查不脱钙的种植体周围组织的组织切片。结果所有种植体有良好的初期稳定性。4周时,实验组下颌双尖牙区1枚微型种植体2级松动,下颌磨牙区1枚折断。组织学分析显示,2组微型种植体与周围组织呈骨性结合,实验组骨生长和再生更活跃。结论自攻微螺旋种植体适用于上颌骨及下颌骨骨皮质较薄区作为正畸支抗源。

Objective To discuss the possibility of self-drilling micro-implants with immediate, continuous orthodontic loading and histolngical reaction of surrounding tissue. Methods Twenty-eight Ti-alloy miniserew implants were placed in an interradieular area of bueeal side of maxilla and mandible in two dogs. Twenty were immediately loaded with a 2 N force activated by nickel-titanium coil springs for nine weeks and eight with no loading as controls. Undeealeified sections of implants and surrounding tissue were studied with general light and fluoreseent light microscope. Results All implants had initial stability. One was loosened at grade 2 and one was broken during the fourth week. Histological analyses revealed ossouintegration of implants and surrounding bone. Modeling and remodeling were more active in study group. Conclusion Self-drilling micro-implants can be used as orthodontic anchorage in the maxilla and thin cortical bone area of the mandible.