Rathi Shraddha, Parkash Hari, Chittaranjan B, Bhargava Akshaya
Department of Prosthodontics, Dr. Z A Dental College, Aligarh Muslim University, Aligarh, India.
Indian J Dent Res. 2011 Nov-Dec;22(6):877-8. doi: 10.4103/0970-9290.94664.
There is dearth of literature regarding the effects of oxidation heat treatment (OHT) as surface pretreatments on bond strength of base metal alloys and porcelain.
Forty-five bar specimens of each two commercially available base metal alloys Mealloy and Wirorn-99 (were fabricated. Dimensions of each specimen were 15.0 × 2.0 × 0.5 mm (according to the ISO 6872-1984). According to the surface pretreatments the samples of the two groups were categorized into three subgroups: With OHT only, with sandblasting only (with Al₂O₃ of 110 μm) and with OHT and sandblasting. Application of commercially available Duceram porcelain in thickness of 2.00 mm was applied over the surface of metal with the pretreatments. Samples were then placed under SEM for EDX examination to evaluate ionic changes that occurred at the metal-ceramic interface. Flexural bond strength of each sample was calculated under Universal Testing Machine.
The one-way ANOVA indicated no significant influence of either metal type (P=0.811) or any surface pretreatment (P=0.757) on the metal-ceramic bond strength.
OHT resulted in the increase in amount of oxides at the metal-ceramic interface. However, neither metal type nor surface pretreatments affected bond strength.
关于氧化热处理（OHT）作为表面预处理对贱金属合金与瓷结合强度的影响，相关文献匮乏。
制备两种市售贱金属合金Mealloy和Wirorn - 99的45个棒状试件。每个试件尺寸为15.0×2.0×0.5mm（根据ISO 6872 - 1984）。根据表面预处理，两组样本分为三个亚组：仅进行氧化热处理、仅进行喷砂处理（使用110μm的Al₂O₃）以及进行氧化热处理和喷砂处理。将厚度为2.00mm的市售Duceram瓷应用于经过预处理的金属表面。然后将样本置于扫描电子显微镜下进行能谱分析，以评估金属 - 陶瓷界面发生的离子变化。在万能试验机上计算每个样本的挠曲结合强度。
单向方差分析表明，金属类型（P = 0.811）或任何表面预处理（P = 0.757）对金属 - 陶瓷结合强度均无显著影响。
氧化热处理导致金属 - 陶瓷界面氧化物数量增加。然而，金属类型和表面预处理均未影响结合强度。
