Objective To compare the long-term clinical effects of two kinds of crowns and bridges made of porcelain fused to Au-Pt alloy and Ni-Cr alloy. Methods A total of 131 teeth (64 patients) were rehabilitated using porcel...Objective To compare the long-term clinical effects of two kinds of crowns and bridges made of porcelain fused to Au-Pt alloy and Ni-Cr alloy. Methods A total of 131 teeth (64 patients) were rehabilitated using porcelain-fused-to-metal crowns, among which 59 were rehabilitated with Au-Pt alloy metal ceramic crown and 72 with Ni-Cr alloy metal ceramic crown. The porcelain fracture, shade, marginal adaptation, gingival discoloration, and gingival status after finishing restoration and 36 months of follow-up were evaluated. Results After 36 months of restoration, porcelain fused to Au-Pt alloy crown showed better clinical effects than porcelain fused to Ni-Cr alloy crown in shade, marginal adaptation, gingival discoloration, as well as gingival status (all P<0.05). Conclusion The Au-Pt alloy ceramic crown is superior to Ni-Cr alloy ceramic crown in long-term clinical effects.展开更多
以Φ57 mm×Φ57 mm×1.5 mm TA2薄壁等径T型管件为典型试验对象,采用液压胀形方法研究了由等厚薄壁无缝钛管材生产钛T型管件的胀形工艺。结果表明,钛T型管件可通过同规格无缝管材在专用设备上液压胀形生产,胀形次数以≥3次为...以Φ57 mm×Φ57 mm×1.5 mm TA2薄壁等径T型管件为典型试验对象,采用液压胀形方法研究了由等厚薄壁无缝钛管材生产钛T型管件的胀形工艺。结果表明,钛T型管件可通过同规格无缝管材在专用设备上液压胀形生产,胀形次数以≥3次为宜 计算钛合金液压胀形单位压力时,应对金属材料胀形单位压力计算公式中的系数1.15进行修正,取1.35~1.6较为适宜。展开更多
文摘Objective To compare the long-term clinical effects of two kinds of crowns and bridges made of porcelain fused to Au-Pt alloy and Ni-Cr alloy. Methods A total of 131 teeth (64 patients) were rehabilitated using porcelain-fused-to-metal crowns, among which 59 were rehabilitated with Au-Pt alloy metal ceramic crown and 72 with Ni-Cr alloy metal ceramic crown. The porcelain fracture, shade, marginal adaptation, gingival discoloration, and gingival status after finishing restoration and 36 months of follow-up were evaluated. Results After 36 months of restoration, porcelain fused to Au-Pt alloy crown showed better clinical effects than porcelain fused to Ni-Cr alloy crown in shade, marginal adaptation, gingival discoloration, as well as gingival status (all P<0.05). Conclusion The Au-Pt alloy ceramic crown is superior to Ni-Cr alloy ceramic crown in long-term clinical effects.
