Effect of different fabrication techniques on the marginal precision of polyetheretherketone single-crown copings
Effect of different fabrication techniques on the marginal precision of polyetheretherketone single-crown copings
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DOI：
10.1016/j.prosdent.2020.04.003
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发表时间：
2020-11-01
影响因子：
4.6
通讯作者：
Shokry, Tamer E.
中科院分区：
文献类型：
--
作者：
Attia, Mazen A.;Shokry, Tamer E.
问题陈述。聚醚醚酮（PEEK）作为固定牙科修复体芯材的需求正在增加。然而，缺乏关于制造过程如何影响这些校准精度的信息。本体外研究的目的是评价不同制作技术对PEEK单冠冠边缘精度的影响。材料和方法。设计不锈钢母模，模拟下颌第二磨牙预备后进行全瓷冠修复。根据制造技术将30个PEEK帽分为3组（n=10）：使用计算机辅助设计和计算机辅助制造（CAD-CAM）系统（PC）从预制PEEK坯件铣削、从预制PEEK颗粒压制（PP）和从PEEK颗粒压制（PG）。此外，通过使用相同的CAD-CAM系统制备3-mol氧化钇稳定的四氧化锆多晶（3 Y-TZP）顶盖（n=10）并用作对照。边缘精度测量（μ m），记录在4个参考点，每个顶盖使用数字显微镜。所得数据采用单因素方差分析和成对Tukey（HSD）检验进行统计分析，研究组间平均值的差异（α = 0.05）。结果。PEEK颗粒内冠边缘开口处的总体平均值+/-标准差边缘间隙为78 +/- 10 μ m，PEEK颗粒内冠为72 +/- 9 μ m，PEEK CAD-CAM内冠为45 +/- 6 μ m，3 Y-TZP CAD-CAM对照为43 +/- 1 μ m。经ANOVA检验，研磨3 Y-TZP和研磨PEEK内冠之间存在统计学显著性差异（P0.05）;此外，在由颗粒或颗粒压制的PEEK内冠之间未观察到显著性差异（P> 0.05）。PEEK CAD-CAM制造的内冠的边缘精度显示出比PEEK压制的内冠显著更低的平均边缘间隙值。记录的边缘间隙平均值均在临床可接受范围内（120 μ m）。
Statement of problem. Demand is increasing for polyetheretherketone (PEEK) as a fixed dental prosthesis core material. However, information is lacking about how the precision of these restorations is affected by the fabrication procedures.Purpose. The purpose of this in vitro study was to evaluate the influence of different fabrication techniques on the marginal precision of PEEK single-crown copings.Materials and methods. stainless-steel master die was designed to simulate a prepared mandibular second molar to receive ceramic crowns. Thirty PEEK copings were fabricated and divided into 3 groups (n=10) according to the fabrication technique: milled from a prefabricated PEEK blank by using a computer-aided design and computer-aided manufacturing (CAD-CAM) system (PC); pressed from prefabricated PEEK pellets (PP); and pressed from PEEK granules (PG); in addition, 3-mol yttria-stabilized tetragonal zirconia polycrystal (3Y-TZP) copings (n=10) were produced by using the same CAD-CAM system and served as a control. Marginal precision measurements (in mu m) were recorded at 4 reference points on each coping by using a digital microscope. The data obtained were statistically analyzed by using 1-way ANOVA and the pairwise Tukey (HSD) test to study the difference between group mean values (alpha=.05).Results. The overall mean +/- standard deviation marginal gap at the marginal opening for the copings was 78 +/- 10 mu m for PEEK granules copings, 72 +/- 9 mu m for PEEK pellet copings, 45 +/- 6 mu m for PEEK CAD-CAM copings, and 43 +/- 1 mu m for the 3Y-TZP CAD-CAM control. A statistically significant difference was found between the milled and pressed copings as indicated by the ANOVA test (P.05) between milled 3Y-TZP and milled PEEK copings; moreover, no significant difference was observed between the PEEK copings pressed from pellets or granules (P>.05).Conclusions. The marginal precision of PEEK CAD-CAM-fabricated copings showed significantly lower mean marginal gap values than PEEK pressed copings. The marginal gap mean values recorded were all within a clinically acceptable range (120 mu m).