Juntavee Niwut, Oeng San-Eak
Department of Prosthodontics, Faculty of Dentistry, Khon Kaen University, Khon Kaen, Thailand.
Division of Biomaterials and Prosthodontics, Faculty of Dentistry, Khon Kaen University, Khon Kaen, Thailand.
J Clin Exp Dent. 2018 Jan 1;10(1):e32-e40. doi: 10.4317/jced.54487. eCollection 2018 Jan.
This study evaluated the metal ceramic bond strength of cast Ni-Cr, cast Co-Cr, sintered Co-Cr and milled Co-Cr alloys to ceramic through two application procedures including the ceramic layering technique and ceramic pressed-on technique.
Ceramic materials (Ø 8 mm, 1.5 mm thickness) were veneered by either the layering or pressed-on technique to cast Ni-Cr, cast Co-Cr, sintered Co-Cr and hard milled Co-Cr alloy disc (12 × 12 × 0.5 mm) (n=15). All specimens were treated with a thermal cycle process for 500 cycles at the temperature between 5 °C and 55 °C with immerse time of 30 seconds and 5 seconds for specimen transfer. The shear bond strength was determined on a universal testing machine at a crosshead speed of 0.5 mm/min. The de-bonding surfaces were examined under visual inspection and SEM. The metal ceramic interface of specimens for each group was examined in SEM and EDS. The means of bond strength were compared using two-way ANOVA followed by post-hoc Tukey HSD multiple comparison test to determine for statistically significant difference at 95% level of confidence. The Weibull analysis was used for determination survival probability of shear bond strength.
The bond strength of ceramic to sintered Co-Cr alloys was higher than that to others metal alloys. The metal-ceramic mean bond strength was significantly higher for the ceramic pressed-on technique than that of the ceramic layering technique for all tested alloys (<0.05). Weibull analysis of the shear bond strength indicated that the sintered Co-Cr alloys veneered with heat pressed ceramic provided the highest characteristic strength of metal ceramic bond.
The sintered Co-Cr alloys significantly contributed the appropriate bond strength for metal ceramic. Ceramic pressed-on was a reliable technique to enhance bond strength for fabrication the metal ceramic restoration. Bond strength, sintered alloy, milled alloy, Co-Cr alloys, metal ceramic.
本研究通过两种应用程序，即陶瓷分层技术和陶瓷压接技术，评估了铸造镍铬合金、铸造钴铬合金、烧结钴铬合金和铣削钴铬合金与陶瓷之间的金属陶瓷结合强度。
采用分层或压接技术，将陶瓷材料（直径8mm，厚度1.5mm）覆盖在铸造镍铬合金、铸造钴铬合金、烧结钴铬合金和硬铣削钴铬合金圆盘（12×12×0.5mm）上（n = 15）。所有试样在5℃至55℃的温度下进行500次热循环处理，浸泡时间为30秒，试样转移时间为5秒。在万能试验机上以0.5mm/min的十字头速度测定剪切结合强度。通过目视检查和扫描电子显微镜检查脱粘表面。对每组试样的金属陶瓷界面进行扫描电子显微镜和能谱分析。使用双向方差分析，随后进行事后Tukey HSD多重比较检验，比较结合强度的均值，以确定在95%置信水平下的统计学显著差异。采用威布尔分析确定剪切结合强度的存活概率。
陶瓷与烧结钴铬合金的结合强度高于与其他金属合金的结合强度。对于所有测试合金，陶瓷压接技术的金属陶瓷平均结合强度显著高于陶瓷分层技术（<0.05）。剪切结合强度的威布尔分析表明，热压陶瓷覆盖的烧结钴铬合金提供了最高的金属陶瓷结合特征强度。
烧结钴铬合金对金属陶瓷具有显著的合适结合强度。陶瓷压接是提高金属陶瓷修复体结合强度的可靠技术。结合强度、烧结合金、铣削合金、钴铬合金、金属陶瓷。
