Minesaki Yoshito, Murahara Sadaaki, Kajihara Yutaro, Takenouchi Yoshihisa, Tanaka Takuo, Suzuki Shiro, Minami Hiroyuki
Kagoshima University Medical and Dental Hospital, Fixed Prosthetic Clinic, Kagoshima, Japan.
Kagoshima University Graduate School of Medical and Dental Sciences, Department of Fixed Prosthodontics, Kagoshima, Japan.
J Adv Prosthodont. 2016 Feb;8(1):1-8. doi: 10.4047/jap.2016.8.1.1. Epub 2016 Feb 23.
The purpose of this study was to evaluate the efficacy of two different metal conditioners for non-precious metal alloys for the bonding of porcelain to a cobalt-chromium (Co-Cr) alloy.
Disk-shaped specimens (2.5×10.0 mm) were cast with Co-Cr alloy and used as adherend materials. The bonding surfaces were polished with a 600-grid silicon carbide paper and airborne-particle abraded using 110 µm alumina particles. Bonding specimens were fabricated by applying and firing either of the metal conditioners on the airborne-particle abraded surface, followed by firing porcelain into 5 mm in diameter and 3 mm in height. Specimens without metal conditioner were also fabricated. Shear bond strength for each group (n=8) were measured and compared (α=.05). Sectional view of bonding interface was observed by SEM. EDS analysis was performed to determine the chemical elements of metal conditioners and to determine the failure modes after shear test.
There were significant differences among three groups, and two metal conditioner-applied groups showed significantly higher values compared to the non-metal conditioner group. The SEM observation of the sectional view at bonding interface revealed loose contact at porcelain-alloy surface for non-metal conditioner group, however, close contact at both alloy-metal conditioner and metal conditioner-porcelain interfaces for both metal conditioner-applied groups. All the specimens showed mixed failures. EDS analysis showed that one metal conditioner was Si-based material, and another was Ti-based material. Si-based metal conditioner showed higher bond strengths compared to the Ti-based metal conditioner, but exhibited more porous failure surface failure.
Based on the results of this study, it can be stated that the application of metal conditioner is recommended for the bonding of porcelain to cobalt-chromium alloys.
本研究旨在评估两种不同的用于非贵金属合金的金属调节剂对瓷与钴铬（Co-Cr）合金结合的有效性。
用Co-Cr合金铸造盘形试样（2.5×10.0 mm），用作被粘物材料。粘结表面先用600目碳化硅砂纸抛光，然后用110 µm氧化铝颗粒进行空气颗粒研磨。通过在空气颗粒研磨表面施加并烧制其中一种金属调节剂，然后烧制直径5 mm、高3 mm的瓷来制备粘结试样。也制备了未使用金属调节剂的试样。测量并比较每组（n = 8）的剪切粘结强度（α = 0.05）。通过扫描电子显微镜观察粘结界面的截面图。进行能谱分析以确定金属调节剂的化学元素，并确定剪切试验后的失效模式。
三组之间存在显著差异，与未使用金属调节剂的组相比，使用两种金属调节剂的组显示出显著更高的值。粘结界面截面图的扫描电子显微镜观察显示，未使用金属调节剂的组在瓷-合金表面接触松散，然而，使用金属调节剂的两组在合金-金属调节剂和金属调节剂-瓷界面均接触紧密。所有试样均呈现混合失效。能谱分析表明，一种金属调节剂是硅基材料，另一种是钛基材料。硅基金属调节剂比钛基金属调节剂显示出更高的粘结强度，但呈现出更多的多孔失效表面。
基于本研究结果，可以说推荐使用金属调节剂来实现瓷与钴铬合金的粘结。
