The trueness of CAD-CAM custom-milled post-and-cores: a comparison of three materials and two milling systems.

IF 1.1 Q3 DENTISTRY, ORAL SURGERY & MEDICINE
Ra'fat I Farah
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引用次数: 0

Abstract

Purpose: The purpose of this in-vitro study was to evaluate the 3D digital trueness of CAD/CAM custom milled post-and-cores fabricated from three contemporary materials using two different 5-axis milling machines.

Materials and methods: A standardized virtual post-and-core CAD design, augmented with landmarks for the standardization of milling, scanning, and 3D analysis protocols, was imported into the CAM software of two different 5-axis milling machines: the CORiTEC 350i and the InLab MC X5. Custom post-and-cores were fabricated from three distinct materials: zirconia, fiber-glass composite, and polyetheretherketone (PEEK). For each material, 10 post-and-cores were milled on each machine, resulting in a total of 60 custom samples. After milling, these post-and-cores were scanned using a standardized method. The resulting scan meshes were superimposed onto the reference CAD design mesh to evaluate 3D surface deviations. A two-way analysis of variance (ANOVA) was employed to determine the effects of material and milling machine on the trueness of the milled post-and-cores.

Results: No significant interaction between material and milling machine was found (p=0.813). PEEK showed significantly lower deviations (mean of 37.2 μm) compared to zirconia (57.2 μm, p<0.001) and glass-fiber composite (48.8 μm, p=0.017). The 350i produced PEEK post-and-cores with mean deviations of 12.7 μm less than the MC X5 (p=0.03), with no significant differences for other material-machine combinations.

Conclusion: Both milling machines demonstrated high trueness in milling post-and-cores. PEEK outperformed zirconia in trueness. When milled with the CORiTEC 350i, PEEK showed a small improvement in trueness over glass-fiber; however, no significant difference was observed with the InLab MC X5. The CORiTEC 350i excelled in milling PEEK, achieving the least 3D deviation, highlighting the influence of both material and machine on the trueness of milled post-and-cores.

CAD-CAM定制铣削柱芯的精度:三种材料和两种铣削系统的比较。
目的:本体外研究的目的是评估使用两种不同的五轴铣床由三种现代材料制成的CAD/CAM定制铣削桩芯的3D数字真实性。材料和方法:将标准化的虚拟桩芯CAD设计,增强了铣削,扫描和3D分析协议标准化的标志,导入到两个不同的5轴铣床(CORiTEC 350i和InLab MC X5)的CAM软件中。定制的桩芯由三种不同的材料制成:氧化锆、玻璃纤维复合材料和聚醚醚酮(PEEK)。对于每种材料,在每台机器上铣削10个桩芯,总共产生60个定制样品。铣削后,使用标准化方法对柱芯进行扫描。将得到的扫描网格叠加到参考CAD设计网格上,以评估三维表面偏差。采用双向方差分析(ANOVA)来确定材料和铣床对铣削桩芯正确率的影响。结果:材料与铣床间无显著交互作用(p=0.813)。与氧化锆(57.2 μm)相比,聚醚醚酮(PEEK)铣床铣削桩芯的精度较低(平均37.2 μm)。结论:两种铣床铣削桩芯的精度较高。PEEK在真实性方面优于氧化锆。当与CORiTEC 350i研磨时,PEEK的真实度比玻璃纤维略有提高;然而,与InLab MC X5没有观察到显著差异。CORiTEC 350i在铣削PEEK方面表现出色,实现了最小的3D偏差,突出了材料和机器对铣削柱芯精度的影响。
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
European Oral Research
European Oral Research DENTISTRY, ORAL SURGERY & MEDICINE-
CiteScore
1.60
自引率
0.00%
发文量
23
审稿时长
12 weeks
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