Toma Flavia Roxana, Moleriu Lavinia Cristina, Porojan Liliana
Department of Dental Prostheses Technology (Dental Technology), Center for Advanced Technologies in Dental Prosthodontics, Faculty of Dental Medicine, "Victor Babeș" University of Medicine and Pharmacy Timișoara, Eftimie Murgu Sq. No. 2, 300041 Timisoara, Romania.
Department of Functional Science, "Victor Babeș" University of Medicine and Pharmacy Timișoara, Eftimie Murgu Sq. No. 2, 300041 Timisoara, Romania.
Polymers (Basel). 2023 Mar 30;15(7):1715. doi: 10.3390/polym15071715.
(1) Background: The use of high-performance polymers for fixed restorations requires additional studies regarding their adaptability and processing with CAD/CAM technology. This in vitro study aims to assess the marginal and internal fit of PEEK and PEKK materials using microcomputed tomography. (2) Methods: Twenty-four ( = 8) MOD onlays made of PEKK (Pekkton ivory), unmodified PEEK (Juvora medical), and modified PEEK (BioHPP) were investigated. A typodont mandibular left first molar was scanned to achieve 24 resin, 3D printed abutment teeth. The onlays were fabricated with a five-axis milling machine, and after cementation of the specimens, the marginal (MG) and internal gaps (IG) were evaluated at twelve points in the mesio-distal section and thirteen points in the bucco-lingual section using microcomputed tomography. For statistical data analysis, Wilcoxon signed-rank/paired Student -Test, Mann-Whitney/unpaired Student -Test, and one-way ANOVA test were applied. (3) Results: Significant differences ( < 0.05; α = 0.05) were reported between the MG and IG for each material for all three polymers and also among two materials in terms of the MG and IG (except Juvora-BioHPP). The highest IG values were recorded in angular areas (axio-gingival line angle) in the mesio-distal section for all the polymers. (4) Conclusions: For all the materials, MG < IG. The type of polymer influenced the adaptability; the lowest marginal and internal gap mean values were recorded for BioHPP. The analyzed polymer used for onlays are clinically acceptable in terms of adaptability.
(1) 背景：将高性能聚合物用于固定修复体需要就其适应性以及使用CAD/CAM技术进行加工开展更多研究。本体外研究旨在使用微型计算机断层扫描评估聚醚醚酮（PEEK）和聚醚酮酮（PEKK）材料的边缘适合性和内部适合性。(2) 方法：对由PEKK（Pekkton象牙色）、未改性PEEK（Juvora医用）和改性PEEK（BioHPP）制成的24个（每组 = 8个）MOD高嵌体进行了研究。扫描一个典型牙列模型的下颌左侧第一磨牙以获得24个树脂3D打印基牙。使用五轴铣床制作高嵌体，在标本粘结后，使用微型计算机断层扫描在近远中截面的12个点和颊舌截面的13个点评估边缘（MG）和内部间隙（IG）。对于统计数据分析，应用了Wilcoxon符号秩/配对学生t检验、Mann-Whitney/非配对学生t检验和单因素方差分析。(3) 结果：所有三种聚合物的每种材料在MG和IG之间以及就MG和IG而言的两种材料之间（Juvora-BioHPP除外）均报告有显著差异（P < 0.05；α = 0.05）。所有聚合物在近远中截面的角部区域（轴龈线角）记录到最高的IG值。(4) 结论：对于所有材料，MG < IG。聚合物类型影响适应性；BioHPP的边缘和内部间隙平均值最低。所分析的用于高嵌体的聚合物在适应性方面临床上是可接受的。
