Ahmadzadeh Asadollah, Ghanavati Saghar
Department of Prosthodontics, Dental School, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
Dent Res J (Isfahan). 2019 Sep 5;16(5):298-303. eCollection 2019 Sep-Oct.
The purpose of this study was to evaluate the bond strength between two porcelains (VITA VMK Master and VITA VM13) and two types of base metal alloys (Ceramill Sintron and Verabond).
In an experimental study, 20 rectangular strips (25 mm × 4 mm × 0.5 mm) of each base metal alloy (Ceramill Sintron and Verabond) were fabricated according to the manufacturer's instructions. After sandblasting and polishing, the samples were placed in an ultrasonic device to remove surface contaminants. A surface of 8 mm × 4 mm × 1 mm of samples was veneered with Vita VM13 and VITA VMK Master. The samples were divided into four groups ( = 10 each group; VM13/Ceramill, VMK Master/Ceramill, VM13/Verabond, and VMK Master/Verabond), and bond strength was evaluated by three-point bending test with a universal testing machine. Two-way ANOVA was used for comparison in each group, Scheffe's test was used for analyzing data between groups, and the Kolmogorov-Smirnov test was used for the normality ( < 0.05).
The maximum bond strength was related to Verabond/VM13 (44.35 ± 7.9 MPa) and then the Ceramill Sintron/VM13 (39.33 ± 4.43 MPa), and the lowest was related to the Ceramill Sintron/VMK Master (29.75 ± 3.2 MPa). There was no significant difference between bond strength of VM13 with the two alloy groups ( > 0.05), and bond strength of VMK Master to Ceramill Sintron CAD/CAM alloy was less than the conventional Verabond alloy ( < 0.05); however, bond strength of all the groups was above the standard threshold (25 MPa).
Based on the results of this study, the bond strength of the porcelain to Verabond was better, but the bond strength of the porcelain to Ceramill Sintron also was not less than the standard threshold; thus, this new CAD/CAM alloy can be an alternative to the conventional base metal alloys in the metal-ceramic restorations.
本研究的目的是评估两种瓷材（VITA VMK Master和VITA VM13）与两种贱金属合金（Ceramill Sintron和Verabond）之间的粘结强度。
在一项实验研究中，按照制造商的说明制作了每种贱金属合金（Ceramill Sintron和Verabond）的20个矩形条（25mm×4mm×0.5mm）。喷砂和抛光后，将样品置于超声设备中以去除表面污染物。在8mm×4mm×1mm的样品表面上用Vita VM13和VITA VMK Master进行饰面处理。将样品分为四组（每组n = 10；VM13/Ceramill、VMK Master/Ceramill、VM13/Verabond和VMK Master/Verabond），并使用万能试验机通过三点弯曲试验评估粘结强度。每组采用双向方差分析进行比较，组间数据分析采用Scheffe检验，采用Kolmogorov-Smirnov检验评估正态性（P < 0.05）。
最大粘结强度与Verabond/VM13（44.35±7.9MPa）相关，其次是Ceramill Sintron/VM13（39.33±4.43MPa），最低的是Ceramill Sintron/VMK Master（29.75±3.2MPa）。VM13与两种合金组之间的粘结强度无显著差异（P > 0.05），VMK Master与Ceramill Sintron CAD/CAM合金的粘结强度低于传统的Verabond合金（P < 0.05）；然而，所有组的粘结强度均高于标准阈值（25MPa）。
基于本研究结果，瓷材与Verabond的粘结强度较好，但瓷材与Ceramill Sintron的粘结强度也不低于标准阈值；因此，这种新型CAD/CAM合金在金属烤瓷修复体中可替代传统的贱金属合金。
