Patel Kavan A, Mathur Somil, Upadhyay Snehal
Department of Prosthodontics and Crown and Bridgework, Faculty of Dental Science, Dharmsinh Desai University, Nadiad, Gujarat, India.
J Indian Prosthodont Soc. 2015 Jan-Mar;15(1):53-7. doi: 10.4103/0972-4052.155036.
The purpose was to evaluate the effect of various surface treatments and sandblasting with different particle size on the bond strength of feldspathic porcelain with predominantly base metal alloys, using a universal testing machine.
Totally, 40 specimen of nickel-chromium alloy were prepared in an induction casting machine. The groups divided were as follows: Group I-sandblasted with 50 μ Al2O3, Group II-sandblasted with 110 μ Al2O3, Group III-sandblasted with 250 μ Al2O3 and Group IV-sandblasted with 250 μ Al2O3, followed by oxidation and again sandblasted with 250 μ Al2O3. The dimensions of each specimen were adjusted so as to maintain the thickness of ceramic at 1 mm. The specimen were loaded on the assembly of the universal testing machine, and a cross head speed of 0.5 mm/min was used to apply a compressive force at the junction of metal and feldspathic porcelain. The force application continued until adhesive fracture occurred, and the readings of the load applied to that particular specimen were recorded.
The means for shear bond strength for Group I, II, III and IV were found to be (226.92 ± 1.67), (233.16 ± 3.85), (337.81 ± 16.97) and (237.08 ± 4.33), respectively. Means of shear bond strength among the groups were compared using one-way analysis of variance test. Comparison between individual groups were made with Tukey's Honestly Significant Difference post-hoc test.
Different particle size and surface treatment have an important role on the bond strength of ceramic-metal interface. Greater particle size demonstrated higher bond strength.
本研究旨在使用万能材料试验机评估不同表面处理以及不同粒径喷砂处理对主要为贱金属合金的长石质瓷粘结强度的影响。
在感应铸造机中制备了总共40个镍铬合金试件。分组如下：第一组用50μm的Al2O3喷砂处理；第二组用110μm的Al2O3喷砂处理；第三组用250μm的Al2O3喷砂处理；第四组先用250μm的Al2O3喷砂处理，然后进行氧化处理，再用250μm的Al2O3喷砂处理。调整每个试件的尺寸，使陶瓷厚度保持在1mm。将试件安装在万能材料试验机上，以0.5mm/min的十字头速度在金属与长石质瓷的结合处施加压缩力。持续施加力直至发生粘结断裂，并记录施加在该特定试件上的载荷读数。
第一组、第二组、第三组和第四组的剪切粘结强度均值分别为(226.92±1.67)、(233.16±3.85)、(337.81±16.97)和(237.08±4.33)。使用单因素方差分析检验比较各组之间的剪切粘结强度均值。使用Tukey's Honestly Significant Difference事后检验对各个组进行比较。
不同粒径和表面处理对陶瓷 - 金属界面的粘结强度有重要影响。粒径越大，粘结强度越高。
