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使用计算机辅助设计/计算机辅助制造技术制作的聚醚醚酮和氧化锆基底冠边缘精度的评估:一项体外研究。

Evaluation of marginal accuracy of polyetheretherketone and zirconia copings fabricated using computer-aided design/computer-aided manufacturing technique: An in vitro study.

作者信息

Jangade Manish, Sharma Ranu, Sudharson Nishanth A, Jain Raj, Sahu Shailendra Kumar, Dani Anurag

机构信息

Department of Prosthodontics (Unit of Dentistry), Smt. Indira Gandhi Memorial Government Medical College, Kanker, Chhattishgarh, India.

Department of Prosthodontics, Rungta College of Dental Sciences and Research, Bhilai, Chhattishgarh, India.

出版信息

J Indian Prosthodont Soc. 2025 Jan 1;25(1):95-101. doi: 10.4103/jips.jips_8_24. Epub 2025 Jan 3.

Abstract

AIM

The aim of this study was to compare the marginal accuracy of polyetheretherketone (PEEK) and zirconia copings fabricated using computer-aided design/computer-aided manufacturing (CAD/CAM) technology, and to assess the impact of their material properties on accuracy when produced with a 4-axis milling system under controlled conditions.

SETTINGS AND DESIGN

The study employed an in vitro design with a stainless steel die model featuring a 6 mm axial wall height, a 6-degree total occlusal convergence, and a radial shoulder finish line.

MATERIALS AND METHODS

Thirty stone dies were created from silicone impressions of the metal die and poured using type-IV dental stone. The dies were divided into two groups: Group-A (PEEK) copings and Group-B (zirconia) copings. All copings were fabricated using a CAD/CAM system. Vertical marginal accuracy was assessed with a stereomicroscope and image analysis software at ×20 magnification. The marginal gaP values were subjected to a student (independent) t-test for statistical analysis.

STATISTICAL ANALYSIS USED

The statistical analysis involved a student (independent) t-test to compare the marginal gaP values between Group A (PEEK) and Group B (zirconia).

RESULTS

The mean marginal discrepancy for Group A (PEEK) and Group B (zirconia) was 92.84 μm ± 3.48 μm and 63.12 μm ± 31.47 μm, respectively. A statistically significant variation (t = 3.635, P = 0.001) between the groups was observed, indicating better marginal accuracy with zirconia copings compared to PEEK copings.

CONCLUSION

Both PEEK and zirconia copings demonstrated vertical marginal discrepancies within the clinically acceptable limit of <120 μm. However, zirconia copings exhibited superior marginal accuracy in this in vitro study.

摘要

目的

本研究旨在比较采用计算机辅助设计/计算机辅助制造(CAD/CAM)技术制作的聚醚醚酮(PEEK)和氧化锆全瓷冠边缘精度,并评估在可控条件下使用四轴铣削系统制作时,其材料特性对精度的影响。

设置与设计

本研究采用体外设计,使用具有6mm轴向壁高度、6度全牙合聚合度和径向肩台边缘线的不锈钢模具模型。

材料与方法

从金属模具的硅橡胶印模制作30个石膏模型,并使用IV型牙科石膏灌注。将模型分为两组:A组(PEEK)全瓷冠和B组(氧化锆)全瓷冠。所有全瓷冠均采用CAD/CAM系统制作。使用体视显微镜和图像分析软件在20倍放大倍数下评估垂直边缘精度。对边缘间隙值进行学生独立t检验以进行统计分析。

所用统计分析方法

统计分析采用学生独立t检验,比较A组(PEEK)和B组(氧化锆)之间的边缘间隙值。

结果

A组(PEEK)和B组(氧化锆)的平均边缘差异分别为92.84μm±3.48μm和63.12μm±31.47μm。两组之间观察到具有统计学意义的差异(t = 3.635,P = 0.001),表明与PEEK全瓷冠相比,氧化锆全瓷冠具有更好的边缘精度。

结论

PEEK和氧化锆全瓷冠的垂直边缘差异均在临床可接受的<120μm范围内。然而,在本体外研究中,氧化锆全瓷冠表现出更高的边缘精度。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d5ef/11853945/46f3be44906f/JIPS-25-95-g001.jpg

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