Statement of problem

A high metal-ceramic bond strength is important for successful dental restorations. However, studies on the evaluation of the bond strength of porous metal–ceramic restorations compared with conventional ones are scarce.

Purpose

The purpose of this in vitro study was to compare the bond strength of a porous metal–ceramic structure with conventional metal-ceramic restorations.

Material and methods

Ten porous specimens were fabricated by selective laser sintering (SLS) according to the International Organization for Standardization 9693-1:2012, 10 specimens without porosity by SLS, and 10 cobalt-chromium (Co-Cr) cast specimens without porosity. The ceramic was applied with the pressing method. A 3-point bend test was performed with a universal testing machine, and the data were statistically analyzed by using 1-way analysis of variance (α=.05).

Results

The mean ±standard deviation bond strength of the porous group fabricated by SLS was the lowest (35.6 ±9.1 MPa), that of the group without porosity in the casting method was 43.5 ±7.8 MPa, and that of the group without porosity fabricated by SLS was the highest (47.7 ±4.5 MPa); these were statistically similar (P=.058).

Conclusions

Although the porous structure reported the lowest bond strength among the 3 sets of test specimens, its bond strength was higher than the International Standards Organization standard of 25 MPa.

中文翻译：

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评价通过增材制造法制备的多孔钴铬金属与压制陶瓷的结合强度。

问题陈述

高金属陶瓷结合强度对于成功的牙齿修复很重要。但是，与传统方法相比，缺乏对多孔金属陶瓷修复体的粘结强度进行评估的研究。

目的

这项体外研究的目的是比较多孔金属陶瓷结构与常规金属陶瓷修复体的结合强度。

材料与方法

根据国际标准化组织9693-1：2012，通过选择性激光烧结（SLS）制作了10个多孔试样，SLS制作了10个无孔隙的试样，以及无孔隙的10个钴铬铸造试样。通过压制法施加陶瓷。用通用测试机进行三点弯曲测试，并使用方差的单向分析（α= .05）对数据进行统计分析。

结果

SLS制备的多孔基团的平均±标准偏差粘结强度最低（35.6±9.1 MPa），铸造方法中无孔的基团的平均±标准偏差为43.5±7.8 MPa，SLS制备的无孔的基团的平均±标准偏差。最高（47.7±4.5 MPa）; 这些在统计学上相似（P = .058）。

结论

尽管多孔结构在三组试样中的粘结强度最低，但其粘结强度却高于国际标准组织的25 MPa标准。