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目的:通过模拟口腔环境,探讨三种唇侧颈缘设计的镍铬合金烤瓷冠适合性的差异,为临床应用提供实验依据。方法:实验分内侧组、肩台组和边缘组,采用冷热循环实验,将粘固于代型上的修复体按5℃,60 s,室温60 s,55℃,60 s,室温60 s为一个循环,共5000循环,再测量3种设计的金瓷冠的垂直浮出量和水平浮出量的差异,并观察在口腔内试戴后的即刻牙龈美学效果,挑选出最佳的设计类型。结果:冷热循环后,三种设计的金瓷冠的垂直浮出量和水平浮出量均有所增大,肩台组的水平浮出量比内侧组和边缘组小,边缘组比内侧组小,颈缘使用了肩台瓷的内侧组比常规设计的边缘组和肩台组更加自然美观。结论:金瓷冠在口腔内使用之后适合性会变差,肩台瓷的使用可以提高金瓷冠的垂直边缘适合性。金属基底逐渐向肩台内侧边缘移行的设计形式不能提高烤瓷冠的水平边缘适合性。
OBJECTIVE: To investigate the suitability of Ni-Cr alloy porcelain crowns designed by three kinds of labial margins by simulating oral environment and provide experimental evidence for clinical application. Methods: The medial group, the shoulder group and the marginal group were divided into two groups according to the experiment of hot and cold cycle. The prosthesis adhered to the surrogate was heated at 60 ℃ for 60 s, 60 ℃ for 60 s, 55 ℃ for 60 s For a cycle, a total of 5000 cycles, and then measure the three designs of gold porcelain crown vertical floating amount and the level of floating out the difference and observed in the mouth after wearing the immediate gingival aesthetic effect, pick the best design Types of. Results: After hot and cold cycles, the vertical floating amount and horizontal floating amount of the three kinds of porcelain crowns increased, while the horizontal floating amount of the shoulder group was smaller than that of the medial group and the marginal group. Small group, the use of the neck edge shoulder porcelain medial group than the conventional design of the edge group and shoulder group more natural and beautiful. CONCLUSION: The fit of porcelain fused to porcelain will deteriorate after oral cavity application. The use of porcelain shoulder porcelain can improve the vertical edge suitability of gold porcelain crowns. The design of the metal substrate gradually moving to the inner edge of the shoulder does not improve the horizontal edge fit of the ceramic crown.