Bassiouny Dina, Petersmann Sandra, Zohdy Maged, Morsi Tarek, Taha Doaa
Assistant Lecturer, Department of Fixed Prosthodontics, Faculty of Dentistry, Ain Shams University, Cairo, Egypt.
Senior Researcher, DMiRE Research Center, Carinthia University of Applied Sciences, Villach, Austria.
J Prosthet Dent. 2025 Mar;133(3):811-819. doi: 10.1016/j.prosdent.2024.06.026. Epub 2024 Aug 1.
Applications of polyetheretherketone (PEEK) as a promising alternative to ceramic materials have extended to include post-and-cores. However, information regarding the available fabrication techniques for producing custom-made PEEK post-and-cores and their effect on accuracy is still scarce.
The purpose of this in vitro study was to evaluate the trueness and intaglio fit of custom-made PEEK post-and-cores fabricated using different techniques.
Ten mandibular second premolars were collected, decoronated, and endodontically treated. For the fabrication of custom-made post-and-cores, each post space was prepared, scanned, and designed by using the exocad software program. Each reference design was used to fabricate PEEK post-and-cores with 3 different techniques (N=30): group P, heat pressing; group S, subtractive manufacturing, and group A, additive manufacturing. All the fabricated restorations were scanned, providing the test data as standard tessellation language (STL) files, which were imported with the reference data into a reverse engineering software program to evaluate the 3D trueness of each fabrication technique. To evaluate the intaglio fit, restorations coated with silicone material were scanned to provide the test data as STL files, which were superimposed on the STL files of the scanned restorations. One-way analysis of variance (ANOVA) and 2-way mixed model ANOVA tests were used to analyze the data (α=.05).
For 3D trueness, root mean square (RMS) values representing the deviations between the scans of the fabricated restorations and the reference designs varied significantly among different groups (P<.001), with the highest mean deviation found in group A (102.8 ±31 µm), while the lowest mean deviation was found in group S (42.2 ±11 µm). For the intaglio fit, the deviations between the scans of the fabricated restorations and the scans of the coated restorations varied significantly among different groups (P<.001), with the highest mean deviation found in group A (228.4 ±47 µm), while the lowest mean deviation was found in group S (96.2 ±14 µm). Simple effects comparisons showed the highest value of deviation in the apical area in group A (P<.001).
Custom-made PEEK post-and-cores fabricated by using subtractive manufacturing and heat pressing techniques showed better trueness and intaglio fit compared with additively manufactured restorations. Before printed PEEK restorations can be considered a suitable alternative to pressed or milled ones, improvements are required to confirm their reliability.
聚醚醚酮（PEEK）作为陶瓷材料的一种有前景的替代材料，其应用已扩展到桩核修复。然而，关于生产定制PEEK桩核的可用制造技术及其对精度的影响的信息仍然很少。
本体外研究的目的是评估使用不同技术制造的定制PEEK桩核的准确性和内表面贴合度。
收集10颗下颌第二前磨牙，去除牙冠并进行根管治疗。为制造定制桩核，每个桩道均进行预备、扫描，并使用exocad软件程序进行设计。每个参考设计用于通过3种不同技术制造PEEK桩核（N = 30）：P组，热压法；S组，减材制造法；A组，增材制造法。对所有制造的修复体进行扫描，以标准镶嵌语言（STL）文件形式提供测试数据，并将其与参考数据一起导入逆向工程软件程序，以评估每种制造技术的三维准确性。为评估内表面贴合度，对涂有硅酮材料的修复体进行扫描，以STL文件形式提供测试数据，并将其叠加在扫描修复体的STL文件上。采用单因素方差分析（ANOVA）和双因素混合模型ANOVA检验分析数据（α = 0.05）。
对于三维准确性，代表制造修复体扫描与参考设计之间偏差的均方根（RMS）值在不同组间差异显著（P <.001），A组的平均偏差最高（102.8 ± 31 µm），而S组的平均偏差最低（42.2 ± 11 µm）。对于内表面贴合度，制造修复体扫描与涂覆修复体扫描之间的偏差在不同组间差异显著（P <.001），A组的平均偏差最高（228.4 ± 47 µm），而S组的平均偏差最低（96.2 ± 14 µm）。简单效应比较显示A组根尖区域的偏差值最高（P <.001）。
与增材制造的修复体相比，采用减材制造和热压技术制造的定制PEEK桩核显示出更好的准确性和内表面贴合度。在打印的PEEK修复体被认为是压制或铣削修复体的合适替代方案之前，需要进行改进以确认其可靠性。
