【摘要】 目的探讨纯钛基底冠厚度对钛烤瓷冠适合性的影响。方法在统一规格树脂基牙模型上制作厚度分别为0.3、0.5、0.7mm的纯钛基底冠试件各10个,共30个,分为6组,每组5个。又按饰瓷与否,分为不饰瓷和饰瓷两类,即0.3、0.5、0.7mm纯钛基底冠不饰瓷试件3组;0.3、0.5、0.7mm纯钛基底冠饰瓷试件3组。所有试件黏固于代型上,测量冠与代型的垂直边缘间隙。而后自凝树脂包埋,唇舌向片切,测量冠与代型的绝对边缘间隙及内间隙。结果垂直边缘间隙、唇侧中点绝对边缘间隙、舌侧中点绝对边缘间隙、轴壁内间隙及切端内间隙在3组不同厚度纯钛基底冠不饰瓷试件间的差异无统计学意义。基底冠饰瓷试件中,0.7mm组纯钛基底冠饰瓷试件在垂直边缘间隙和唇侧中点绝对边缘间隙同0.3、0.5mm组纯钛基底冠饰瓷试件的差异具有统计学意义(P<0.05);舌侧中点绝对边缘间隙、轴壁内间隙及切端内间隙在3组不同厚度纯钛基底冠饰瓷试件间均无明显差异。结论0.3、0.5、0.7mm厚铸造纯钛基底烤瓷冠适合性基本符合临床要求,其中纯钛基底冠厚度为0.5mm最佳。更多还原

【Abstract】 Objective To discuss the influence of thickness on the fit of porcelain fused metal(PFM) of com-mercial pure titanium(cp Ti) copings. Methods 30 maxillary incisor resin PFM abutments fabricated by machine with the identical standard was divided into six groups, which were waxed-up, invested and cast with cp Ti. For every kind of thickness of copings which was in order of 0.3, 0.5 and 0.7 mm, there were two groups. One group was veneered, the other was not. That was, three groups veneered, three groups not veneered. All the samples were cemented on their own abutments, after completing the vertical marginal gap measurements the same samples were embedded in acrylic resin and cut mid-orolabially, absolute marginal gap and internal gap were measured. Results When the copings were not veneered, there were no significant differences with the vertical marginal gap, labiocentral and linguocentral absolute marginal gap, wall internal gap and incisive internal gap among three groups. When the copings were veneered, the vertical marginal gap of 0.7 mm group was larger than those of 0.3 and 0.5 mm groups(P<0.05) and the labiocentral absolute marginal gap of 0.7 mm group was also larger than those of 0.3 and 0.5 mm groups(P<0.05). Conclusion The fit of PFM of 0.3, 0.5, 0.7 mm thickness cp Ti copings was accorded with the demands of clinic, and the thickness of 0.5 mm of cp Ti coping was recommended in clinic.更多还原