摘要目的 探讨自行研发并已获得国家发明专利的新型牙科铸钛包埋材料和商品铸钛包埋材料铸造纯钛铸件的表面粗糙度差异,以期为临床应用提供依据.方法 制作20 mm×20 mm×0.5 mm的蜡型6片,分为A、B两组,每组3片,分别用新型牙科铸钛包埋材料和商品铸钛包埋材料( Rematitan Plus)包埋铸造纯钛铸件.表面粗糙度检查仪测试铸件表面粗糙度,每个铸件测试3个部位,表面描记长度为5.6 mm,比较两组铸件表面粗糙度Ra值的差异.结果 A组铸件表面粗糙度Ra值为(1.72±0.08) μm,小于B组[(1.91 ±0.15) μm],差异有统计学意义(P＜0.05).结论 新型牙科铸钛包埋材料所铸钝钛铸件的表面粗糙度比目前临床常用的商品铸钛包埋材料所铸钝钛铸件表面粗糙度小,可满足临床应用要求.

abstractsObjective To investigate the surface roughness property of the titanium castings cast in a new investment for titanium casting. Methods Six wax patterns (20 mm × 20 mm× 0.5 mm) were invested using two investments:three in a new titanium investment material and three in the control material (Rematitan Plus). Six titanium specimens were obtained by conventional casting. Aftcr casting,surface roughness of the specimens were evaluated with a surface profilometer.Results The surface roughness of the specimens cast in ncw titanium investment material was ( 1.72 ± 0.08) μm,which was much smaller than that from Rematitan Plus[ ( 1.91 ± 0.15 ) μm,P ＜ 0.05 ].Conclusions The surfaces of titanium cast using these two investment materials are both smooth enough to fulfill the demand of the titanium precision-casting for prosthodontic clinical use.