Studies on the veneered titanium crown with resin composites for a clinical use

用离心铸造法将蜡模上制备的固位珠结构成功地复制到钛铸件上。然而，扫描电镜观察表明，即使在喷砂后，包埋材料仍然残留在铸件表面的保持珠之间。因此，我们的目的是应用一个非固位珠的方法对金属框架的贴面钛冠。我们首先检查喷砂处理条件，使用三个平均粒径的氧化铝对CP钛（CP Ti）和钴铬合金（Co-Cr）板作为对照。EDX分析表明，在CP Ti和Co-Cr上，表面上的氧化铝量分别为33- 45wt%和22-42wt%。这些结果表明，较低的压力和较短的处理时间更适合于钛合金的喷砂处理，此外，我们需要更多关于金属和氧化铝板的结合表面的信息来阐明氧化铝颗粒喷砂金属表面的结合机制。我们使用三种不同尺寸的氧化铝颗粒（50 μ m，110 μ m和250 μ m）喷砂检查商业树脂粘接系统与CP钛的粘接强度。喷砂与250微米氧化铝颗粒表现出最高的结合强度。结合强度随氧化铝颗粒尺寸的增大而增大。然而，在110 μ m和250 μ m的强度以及50 μ m的抛光表面之间没有统计学显著差异。烧结氧化铝板的粘结强度显着低于钛的商业NMC和CSD粘结系统，具有良好的钛的粘结。我认为，氧化铝颗粒喷砂钛表面的氧化铝的存在是没有用的，以改善树脂复合材料的粘结性能喷砂表面的CP钛。

The structure of retention beads prepared on the wax pattern was successufully reconstructed on the titanium castings by a centrifugal casing method. However, SEM observation indicated that investment material still remained on the surface of the castings among the retention beads even after sandblasting. Therefore, we aimed to apply a non-retention beads method on the metal frame for veneered titanium crowns.We at first examined the treating conditions for sandblasting using three average particle sizes of alumina on the plates of cp titanium (cp Ti) and cobalt-chrome allowy (Co-Cr) as a control. EDX analyzes showed the amount of alumina on the surface was 33-45 wt% on cp Ti and 22-42wt% on Co-Cr, respectively. These results suggested that the lower pressure and shorter treating time were suitable to perform sandblasting for titanium than for other dental alloys.Furthermore, we need more information on the bonding surface of both metal and alumina plates to clarify the bonding mechanism of the surface of the metal sandblasted by alumina particles. We examined bonding strengths of commercial resin bonding systems to cp titanium with sandblasting using three different sizes of alumina particles (50mum, 110mum and 250mum). Sandblasting with 250mum alumina particles showed the highest bonding strength. The bonding strength increased with the increase of the size of alumina particles. However, there were no statistically significant differences among the strength from 110mum and 250mum, and polished surface with 50mum. Bonding strength for sintered alumina plates was significantly lower than that of titanium on the commercial NMC and CSD bonding systems that had excellent bonding for titanium.I suggest that the existence of alumina on titanium surface by sandblasting with alumina particles was not useful to improve bonding properties of resin composites on the sandblasted surface of cp titanium.