两种微螺钉种植体支抗在上颌后牙根间区的稳定性研究

Comparison of Success Rate of Two Kinds of Micro-implant System in Posterior Area

目的：对比两种材质（钛钉和不锈钢钉）微螺钉种植体支抗植入上颌后牙根间区的脱落率,并对各类影响因素进行分析,为医生选择设计提供参考。方法：102例正畸患者平均年龄21岁（13～46岁）。正畸设计强支抗,在上颌后牙根间区共植入172枚微螺钉种植体支抗。研究按照种植体类型（钛钉1.6 mm×8 mm,不锈钢钉1.5mm×8mm）、骨面型（高角和非高角）和年龄（成人和青少年）进行分组。统计分析使用SPSS 13.0软件包。采用卡方检验比较种植体类型、骨面型、年龄对脱落的影响。结果：种植体类型和骨面型对脱落率的影响具有统计学意义（P〈0.05）;成年和青少年脱落率的差别无统计学意义。结论：钛钉植入上颌后牙根间区稳定性优于不锈钢钉。高角患者种植体脱落率较高。

Objective：To compare the stability of two kinds of micro-screw system placed in maxillary posterior area.Methods：102patients were selected with 176micro-screws placed.Possible influencing factors including the kinds of micro-screws,age and skeletal patterns were analyzed by Chi-square tests through SPSS Statistical Package.Results：Different kinds of micro-screws and different skeletal patterns exhibited significantly different failure rates（P〈0.05）.No significant difference was found between age groups.Conclusion：Higher failure rates were conformed in group of stainless steel micro-screws compared with Ti-alloy micro-screws.The failure rates in high angle cases were higher than those of lower and average angle cases.