论文部分内容阅读
目的探讨不同颈部结构钛人工牙种植体的骨结合性能。方法构建四种不同颈部结构钛种植体(均衡螺纹组、宽颈组、颈部单头微螺纹组、颈部双头微螺纹组),建立兔股骨种植体动物模型,采用X-ray平片观察、旋出扭矩测试,分析术后不同阶段各组种植体-骨组织的界面特点。结果 X-ray平片观察种植体植入术后12周时,各组种植体均呈高密度阻射影像;各种植体周围界面无透射线性影像,与周围骨的骨密度比较相似;各种植体颈部周围未见明显骨吸收影像。旋出扭矩结果,在4周时UT组0.17±0.01 N·m,WN组0.15±0.01 N·m,SMN组0.20±0.01 N·m,DMN组0.20±0.01 N·m;在8周时UT组0.20±0.01N·m,WN组0.18±0.01N·m,SMN组0.24±0.01 N·m,DMN组0.24±0.01N·m;在12周时UT组0.28±0.01 N·m,WN组0.26±0.01N·m,SMN组0.32±0.01N·m,DMN组0.32±0.01 N·m;在4、8、12周时,SMN组与DMN组旋出扭矩值无明显差别,均高于UT组、WN组的旋出扭矩值;WN组最低。各差异具有统计学意义。各组扭矩值变化趋势大体一致,植入后8周时较4周有所升高,12周时升高明显达到峰值。结论钛牙种植体颈部采用与主螺纹相同形态的微螺纹较均衡螺纹及光滑宽颈结构具有更好的骨结合性能。
Objective To investigate the bone-bonding properties of titanium artificial dental implants with different neck structures. Methods Four kinds of titanium implants with different neck structures (balanced thread group, wide neck group, single-head neck micro-thread group and double-neck neck micro thread group) were established. Animal models of femoral implant were established. Slice observation, spin-out torque test, analysis of the different stages of postoperative implant-bone tissue interface characteristics of each group. Results X-ray plain radiography showed that the implants of all groups showed high-density images at 12 weeks after implantation. There was no radiographic image around the interface of the implants, which was similar to the bone mineral density of the surrounding bone. Body around the neck no significant bone absorption image. The results of screw-out torque were 0.17 ± 0.01 N · m in UT group, 0.15 ± 0.01 N · m in WN group, 0.20 ± 0.01 N · m in SMN group and 0.20 ± 0.01 N · m in DMN group at 4 weeks. UT 0.20 ± 0.01N · m in WN group, 0.18 ± 0.01N · m in WN group, 0.24 ± 0.01N · m in SMN group and 0.24 ± 0.01N · m in DMN group, and 0.28 ± 0.01N · m in UT group at 12 weeks 0.26 ± 0.01N · m, 0.32 ± 0.01N · m in SMN group and 0.32 ± 0.01N · m in DMN group. At 4th, 8th, and 12th week, there was no significant difference in the values of spin-off torque between SMN group and DMN group UT group, WN group screw out value; WN group the lowest. The differences were statistically significant. The change trend of torque values in each group were generally the same, increased at 8 weeks after implantation, and reached the peak at 12 weeks. Conclusion The micro-thread with the same morphology as the main thread in the neck of titanium dental implants has better bone-bonding performance than the balanced thread and smooth neck structure.