摘要
目的:探索采用圆洞标记法测量口腔不规则硅橡胶印模形变的可行性。方法:模拟口腔临床基牙牙备体制作金属母模,表面有互成三角形的凸出圆形钢针。分别用2种硅橡胶材料制取印模,在突出钢针的对应部位形成圆洞标记点。用体式显微镜观察圆洞的形态变化,用圆心模拟软件标定坐标并测量位移,最后计算出2组印模的形变。结果:圆洞标记点边缘轮廓清晰、形态稳定,圆心坐标重复性好。2种硅橡胶样本48h的线性变化率分别为0.023%和0.042%。2个牙备体间,金玛克硅橡胶样本形变在1h时增大0.214%(45.1μm),48h时减小0.019%(4.0μm);3M硅橡胶样本形变在1h时增大0.087%(18.2μm),48h时减小0.09%(18.8μm)。结论:临床可采用圆洞标记法测量口腔不规则硅橡胶印模的形变。
PURPOSE： To investigate the feasibility of the pin-hole marker measurement of the irregular silicone dental impression accuracy. METHODS： The metal model simulating abutment preparations had triangle-formed circular needles on the surface. Two silicone impressions were made by the metal model with the corresponding pin-hole markers. The dimensional change of the markers was evaluated by stereomicroscope. The records were output by the software which could simulate the centre of a circle to measure the displacement and dimensional accuracy. RF^ULTS： The outline of pin-hole marker was clear and shape was stable. Values of center coordinates were repeated well. The percentage of linear dimensional change of two impression samples was 0.023% and 0.042% at 48h respectively. Between two abutment preparations, the percentage of linear dimensional change of Zhermeck silicone impression increased 0.214%（45.1μm） at lh and decreased 0.019%（4.0μm） at 48h while 3M silicone impression increased 0.087%（18.2μm） at lh and decreased 0.09%（18.8μm） at 48h. CONCLUSION： The pin-hole marker measurement of the irregular silicone impression accuracy was feasible.
出处
《上海口腔医学》
CAS
CSCD
北大核心
2012年第3期262-265,共4页
Shanghai Journal of Stomatology
基金
上海市科学技术委员会资助项目(08DZ2271100)
上海市重点学科建设项目(T0202,S30206)~~
关键词
口腔印模
印模测量
印模形变
Dental impression
Measurement
Dimensional change
