应用超声器械改善预备体肩台的效果Evaluation of the effect of using ultrasonic instruments to improve the shoulder of the preparations
李思雨;段雪飞;曹烨;
摘要(Abstract)：
目的:比较超声器械与金刚砂车针预备所形成的肩台表面粗糙度的差异,为超声肩台预备的临床开展提供依据。方法:(1) 6颗离体前磨牙颊舌侧的不同区域分别使用不同粗糙度的金刚砂车针进行预备,聚醚橡胶制取肩台区印模,三维形貌测量激光显微镜(three-dimensional topography measurement laser microscope,3-D TMLM)扫描印模并比较表面粗糙度。(2) 6颗离体前磨牙颊侧的近、远中分别使用金刚砂车针和超声器械进行预备,聚醚橡胶制取肩台区印模,3-D TMLM扫描印模并比较表面粗糙度,牙科显微镜(×25)观察肩台表面形态。(3)上颌对称同名离体前牙20颗,灌注标准模型后随机分为超声器械组和金刚砂车针组,于仿头模上牙体预备后聚醚橡胶制取肩台印模;扫描并对比肩台印模近中、中央、远中区域表面粗糙度。用SPSS 25.0软件进行统计学分析。结果:(1)不同区域内预备体肩台和印模肩台的Ra和Rz差异均无统计学意义。(2)超声器械预备后肩台印模表面粗糙度[Ra:(6.59±2.33)μm,Rz:(34.69±7.29)μm]明显小于金刚砂车针[Ra:(21.79±4.89)μm,Rz:(91.69±14.82)μm](P <0.05);牙科显微镜下可见超声预备的肩台形态清晰连续。(3)超声器械预备后肩台印模各区域的表面粗糙度Ra均小于金刚砂车针,其差异有统计学意义(P <0.001);超声器械预备后肩台印模各区域表面粗糙度Ra的差异无统计学意义,而金刚砂车针预备后肩台印模在近中及远中区域的表面粗糙度Ra均大于中央区域,其差异有统计学意义(P <0.001)。结论:超声器械可获得更光滑的肩台表面,尤其可以显著改善肩台近邻面处的预备效果。
关键词(KeyWords)： 超声器械;肩台预备;粗糙度;三维形貌;印模
基金项目(Foundation): 北京大学口腔医院新技术新疗法项目(PKUSSNCT-14B04)~~
作者(Author): 李思雨;段雪飞;曹烨;
Email:
DOI: 10.19723/j.issn.1671-167X.2021.01.014
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