Effect of machining method and margin design on the accuracy and margin quality of monolithic zirconia crowns.

IF 4.3 2区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE
Yi Zhou, Wenjia Chen, Han Zhu, Xiaochen Liu, Haiping Yang, Fuming He
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引用次数: 0

Abstract

Statement of problem: The machining accuracy and marginal integrity of monolithic zirconia crowns with minimal invasive preparations may impact the long-term survival rate of tooth and periodontal health, but studies on the effect of machining method are lacking.

Purpose: The purpose of this in vitro study was to digitally evaluate the machining accuracy and margin quality of monolithic zirconia crowns fabricated using gel deposition and conventional soft milling processes by comparing 2 different margin types.

Material and methods: A total of 40 monolithic zirconia crowns were produced using gel deposition (Self-glazed Zirconia Group, SGG, n=20) and soft milling (Milled Zirconia Group, MG, n=20). Each group was further divided into 2 subgroups with different margin designs (chamfer and feather-edge). The trueness and fit of crowns were compared using root mean square (RMS) values. Furthermore, the margin quality was examined before and after final sintering with a scanning electron microscope (SEM). The Scheirer-Ray-Hare and 2-way ANOVA test analysis nonparametric and parametric data, respectively (α=.05).

Results: The trueness analysis revealed that SGG had significantly lower RMS values for both the cameo and intaglio areas compared with MG (P<.001). In addition, crowns with a feather-edge margin exhibited significantly lower marginal RMS values than those with a chamfer margin (P<.01) according to the fit assessment. Followed by milling processes, SGG exhibited a constantly homogeneous microstructure compared with MG. Marginal defects were detected in both groups except for the SGG with the chamfer margin.

Conclusions: SGG exhibited better accuracy associated with ductile-regime machining than MG, and SGG with chamfer margins displayed flaw-free margin areas. Moreover, the feather-edge margin showed improved marginal fit compared with the chamfer margin.

加工方法和边缘设计对整体氧化锆冠的精度和边缘质量的影响
问题陈述:微创制备的整体氧化锆冠的加工精度和边缘完整性可能会影响牙齿的长期存活率和牙周健康,但缺乏有关加工方法影响的研究。目的:本体外研究的目的是通过比较2种不同的边缘类型,对使用凝胶沉积和传统软铣工艺制作的整体氧化锆冠的加工精度和边缘质量进行数字化评估:使用凝胶沉积法(自釉氧化锆组,SGG,n=20)和软铣法(铣削氧化锆组,MG,n=20)共制作了 40 个整体氧化锆冠。每组又分为两个边缘设计(倒角和羽状边缘)不同的亚组。使用均方根(RMS)值比较牙冠的真实度和密合度。此外,还使用扫描电子显微镜(SEM)检查了最终烧结前后的边缘质量。分别采用 Scheirer-Ray-Hare 和 2-way ANOVA 检验分析非参数数据和参数数据(α=.05):真实度分析表明,与 MG 相比,SGG 在浮雕和凹雕区域的均方根值明显较低(PConclusions):与 MG 相比,SGG 表现出更好的韧性机械加工精度,带有倒角边缘的 SGG 显示出无缺陷的边缘区域。此外,与倒角边缘相比,羽边边缘的边缘贴合度有所提高。
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来源期刊
Journal of Prosthetic Dentistry
Journal of Prosthetic Dentistry 医学-牙科与口腔外科
CiteScore
7.00
自引率
13.00%
发文量
599
审稿时长
69 days
期刊介绍: The Journal of Prosthetic Dentistry is the leading professional journal devoted exclusively to prosthetic and restorative dentistry. The Journal is the official publication for 24 leading U.S. international prosthodontic organizations. The monthly publication features timely, original peer-reviewed articles on the newest techniques, dental materials, and research findings. The Journal serves prosthodontists and dentists in advanced practice, and features color photos that illustrate many step-by-step procedures. The Journal of Prosthetic Dentistry is included in Index Medicus and CINAHL.
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