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首页> 外文期刊>The Journal of Prosthetic Dentistry >A comparison of the marginal vertical discrepancies of zirconium and metal ceramic posterior fixed dental prostheses before and after cementation.
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A comparison of the marginal vertical discrepancies of zirconium and metal ceramic posterior fixed dental prostheses before and after cementation.

机译：粘接前后锆和金属陶瓷后固定牙修复体的边缘垂直差异的比较。

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STATEMENT OF PROBLEM: Marginal discrepancies of zirconia posterior fixed dental prostheses (FDPs) fabricated using various systems have been assessed to determine the quality of the restorations and facilitate clinical use; however, studies are limited and results are ambiguous because of the sample sizes and measurement methods. PURPOSE: The purpose of this in vitro study was to compare changes in marginal fit of posterior fixed dental prostheses of 3 zirconia systems manufactured using CAD/CAM technology and metal ceramic posterior fixed dental protheses fabricated with the conventional lost-wax technique, before and after cementation. MATERIAL AND METHODS: Forty standardized master steel dies with 2 abutments simulating first mandibular premolars were fabricated to receive a posterior 3-unit FDP (from first molar to first premolar) and divided into 4 groups (n=10): Lava All-Ceramic System, Procera Bridge Zirconia, VITA In-Ceram 2000 YZ, and metal ceramic (control group). All FDPs were prepared for an internal space of 50 microm. The external marginal gap of the restorations was investigated by measuring 30 points in the middle of the buccal and lingual surfaces; therefore, 60 measurements per abutment were recorded. Measurements were made with an image analysis program on the master steel model before and after conventional cementation with a glass ionomer agent (Ketac Cem Easymix). The data obtained were statistically analyzed using 1-way ANOVA, Duncan's multiple range post hoc test, and Student's paired t test (alpha=.05). RESULTS: No significant differences in the vertical marginal fit before and after cementation were recorded for the analyzed groups. The marginal discrepancy of Procera abutments before and after cementation (9 +/-10 microm and 12 +/-9 microm, respectively) was less than that of the other groups. Significant differences (P=.001) were observed in marginal adaptation between Procera Bridge Zirconia and the other groups. CONCLUSIONS: The results of this study showed that cementation did not cause a significant increase in the vertical marginal discrepancies of the FDPs and that an internal space of 50 mum provided a high precision of fit of the restorations. The accuracy of fit achieved for the 3 zirconium oxide groups analyzed was within the range of clinical acceptance, and the discrepancies were lower than in the metal ceramic group. Procera Bridge Zirconia showed the lowest vertical discrepancies.
机译：问题陈述：已经评估了使用各种系统制造的氧化锆后固定牙修复体（FDP）的边缘差异，以确定修复体的质量并促进临床使用;然而，由于样本量和测量方法的限制，研究有限且结果不明确。目的：这项体外研究的目的是比较使用CAD / CAM技术制造的3种氧化锆系统和使用传统的脱蜡技术制造的金属陶瓷后固定牙齿修复前后的后固定牙齿修复体的边缘适合度变化胶结作用。材料与方法：制作了40个带有2个基台的模拟主钢模，模拟了第一下颌前磨牙，以接受后3单元FDP（从第一磨牙到第一前磨牙）并分为4组（n = 10）：熔岩全陶瓷系统，Procera Bridge氧化锆，VITA In-Ceram 2000 YZ和金属陶瓷（对照组）。所有FDP的内部空间均为50微米。通过测量颊侧和舌侧中间的30个点来研究修复体的外部边缘间隙。因此，每个基台记录了60个测量值。在使用玻璃离子交联剂（Ketac Cem Easymix）进行常规胶结之前和之后，使用图像分析程序对母钢模型进行测量。使用1-way ANOVA，Duncan多范围事后检验和St​​udent's成对t检验（alpha = .05）对获得的数据进行统计分析。结果：分析组在胶结前后的垂直边缘拟合无明显差异。胶合前后Procera基台的边缘差异（分别为9 +/- 10微米和12 +/- 9微米）小于其他两组。在Procera桥氧化锆与其他组之间的边缘适应性方面观察到显着差异（P = .001）。结论：这项研究的结果表明，胶结作用并没有导致FDPs的垂直边缘差异显着增加，而且50毫米的内部空间提供了修复体的高精度安装。分析的3个氧化锆组的拟合精度在临床可接受的范围内，并且差异低于金属陶瓷组。 Procera桥氧化锆显示出最低的垂直差异。

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