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

采用离心套管法在钛铸件上成功地重建了蜡模上制备的保留珠的结构。然而，SEM观察表明，喷砂后，熔模材料仍残留在铸件表面的保留珠之间。因此，我们的目标是在贴面钛冠的金属框架上应用无滞留珠的方法。我们首先以三种平均粒径的氧化铝在cp钛（cp Ti）板和钴铬合金（Co-Cr）板上作为对照，考察了喷砂处理条件。EDX分析表明，表面氧化铝含量在cp Ti上为33-45 wt%，在Co-Cr上为22-42wt%。结果表明，较低的喷砂压力和较短的喷砂时间适合于钛合金的喷砂处理。此外，我们需要更多的金属和氧化铝板结合表面的信息，以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（50mum， 110mum和250mum），通过喷砂测试了商用树脂粘接系统与cp钛的粘接强度。喷砂250mum氧化铝颗粒的结合强度最高。结合强度随氧化铝颗粒尺寸的增大而增大。而110、250、50mum抛光表面的强度差异无统计学意义。烧结氧化铝板的结合强度明显低于钛在商用NMC和CSD结合体系上的结合强度，而商用NMC和CSD结合体系对钛的结合效果很好。结果表明，喷砂处理后钛表面存在氧化铝，不利于提高cp钛喷砂表面树脂复合材料的结合性能。

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.