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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。
Objective: To explore the feasibility of using hole marking method to measure the deformation of irregular silicone rubber impression in oral cavity. Methods: To simulate oral clinical abutment tooth body to produce metal master mold, the surface of the triangle into each protruding round steel needle. The molds were made from two kinds of silicone rubber materials, respectively, and circular markings were formed on the corresponding parts of the protruding steel needle. The morphological changes of the round hole were observed with a body microscope, and the coordinates were measured with a center-of-center simulation software to measure the displacement. Finally, the deformations of the two groups of stamps were calculated. Results: The edge of the circular mark has a clear outline, stable shape and good repeatability of center coordinates. The linear change rates of the two silicone rubber samples for 48 h were 0.023% and 0.042%, respectively. The deformation of the samples of Jinmake silicone rubber increased by 0.214% (45.1μm) at 1h and decreased by 0.019% (4.0μm) at 48h, while the deformation of 3M silicone rubber samples increased by 0.087% at 1h 18.2 μm) and 0.09% (18.8 μm) at 48 h. Conclusion: It is clinically possible to measure the deformation of irregular silicone rubber impression by circular hole marking method.