Accuracy, fit, and marginal quality of advanced additively manufactured and milled zirconia 3-unit fixed dental prostheses.

IF 4.3 2区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Journal of Prosthetic Dentistry Pub Date : 2024-10-15 DOI:10.1016/j.prosdent.2024.09.016
Yujie Wang, Yi Zhou, Han Zhu, Jimin Jiang, Fuming He
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Abstract

Statement of problem: Advanced additive manufacturing (AM) of zirconia is an emerging technology that can explore the limitations of traditional computer-aided design and computer-aided manufacturing (CAD-CAM) milling techniques. However, a comprehensive evaluation of their differences in producing zirconia restorations, especially multi-unit restorations, is lacking.

Purpose: The purpose of this in vitro study was to compare the accuracy, fit, marginal quality, and surface roughness of zirconia 3-unit fixed dental prostheses (FDPs) by using advanced AM and 2 CAD-CAM milling materials.

Material and methods: Based on the same CAD model, 30 3-unit posterior FDPs (n=10) were manufactured by using AM and 2 CAD-CAM milling materials (VT and UP). The accuracies of the total, intaglio, occlusal, axial, and marginal regions were calculated separately by comparing the scanned model with the design model by using 3-dimensional (3D) deviation analysis. The silicone layer was scanned to evaluate the marginal and intaglio fit in 3 dimensions. A 3D laser microscope was used for surface roughness detection, marginal quality assessment, and marginal defect measurement. The data were analyzed using ANOVA and the Tukey post hoc test (α=.05).

Results: Compared with CAD-CAM milling, the AM group had higher accuracy and smaller positive deviations on the axial and intaglio regions (P<.001). Different manufacturing methods showed no statistically significant effect on the mean intaglio fit (P>.05), and all were within the clinically acceptable range (<100 µm). The intaglio gap was significantly higher than the target parameter in the occlusal regions. AM-fabricated FDPs had significantly higher surface roughness than milled ones, yet showed better margin quality with fewer marginal defects CONCLUSIONS: Compared with CAD-CAM milling, the advanced additively manufactured zirconia 3-unit FDPs provided better accuracy, improved margin quality, and clinically acceptable fit, but higher surface roughness, and may be a promising alternative for clinical applications.

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先进的添加剂制造和铣削氧化锆三单元固定义齿的精度、密合度和边缘质量。
问题陈述:氧化锆先进增材制造(AM)技术是一项新兴技术,它可以克服传统计算机辅助设计和计算机辅助制造(CAD-CAM)铣削技术的局限性。目的:本体外研究的目的是比较使用先进的 AM 和 2 种 CAD-CAM 铣削材料制作氧化锆三单元固定义齿(FDP)的精度、密合度、边缘质量和表面粗糙度:根据相同的 CAD 模型,使用 AM 和 2 种 CAD-CAM 铣削材料(VT 和 UP)制造了 30 个 3 单元后部 FDP(n=10)。通过三维(3D)偏差分析,将扫描模型与设计模型进行比较,分别计算了总区域、凹面区域、咬合区域、轴向区域和边缘区域的精确度。对硅胶层进行扫描,以评估边缘和凹面的三维密合度。使用三维激光显微镜进行表面粗糙度检测、边缘质量评估和边缘缺陷测量。数据分析采用方差分析和 Tukey 后检验(α=.05):与 CAD-CAM 铣削相比,AM 组在轴向和凹面区域的精确度更高,正偏差更小(P.05),且均在临床可接受的范围内(P.05)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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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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