Jeon Su-Hee, Song Young Woo, Cha Jae-Kook, Paik Jeong-Won, Han Sang-Sun, Choi Seong-Ho
Department of Periodontology, Research Institute for Periodontal Regeneration, Yonsei University College of Dentistry, Seoul 03722, Korea.
Department of Oral and Maxillofacial Radiology, Yonsei University College of Dentistry, Seoul 03722, Korea.
Materials (Basel). 2021 Mar 22;14(6):1557. doi: 10.3390/ma14061557.
The aim of this study was to assess the internal fit accuracy of a three-dimensional (3D)-printed biphasic calcium phosphate (BCP) block compared with a 3D-milled poly methyl methacrylate (PMMA) block by scanning electron microscope (SEM) analysis. In a total of 20 porcine rib bones, two different types of defects having two adjacent walls and a floor were produced: a defect with a flat floor (flat defect; = 10) and a defect with a concave floor (curved defect; = 10). Each defect was grafted with either the 3D-printed BCP block or the 3D-milled PMMA block fabricated following the computer aided design. The defects were then cut cross-sectionally and evaluated under the SEM. The extents of internal contact and gap were measured and statistically analyzed ( < 0.05). All blocks in both BCP and PMMA groups were successfully fit to the flat and curved defects. The internal contact ratio was significantly higher in the BCP group (flat defect: 0.47 ± 0.10; curved defect: 0.29 ± 0.05) compared with the PMMA group (flat defect: 0.21 ± 0.13; curved defect: 0.17 ± 0.04; < 0.05). The internal gap area was similar between the two groups regardless of the defect types ( > 0.05). The internal fit accuracy of the 3D-printed BCP block was reliable in both the flat and curved defects when compared with the accuracy of the 3D-milled PMMA block.
本研究的目的是通过扫描电子显微镜（SEM）分析，评估三维（3D）打印的双相磷酸钙（BCP）块与3D铣削的聚甲基丙烯酸甲酯（PMMA）块相比的内部贴合精度。在总共20根猪肋骨中，制造了两种不同类型的具有两个相邻壁和一个底面的缺损：底面平坦的缺损（平坦缺损；n = 10）和底面凹陷的缺损（弯曲缺损；n = 10）。每个缺损用按照计算机辅助设计制造的3D打印BCP块或3D铣削的PMMA块进行移植。然后将缺损进行横截面切割，并在SEM下进行评估。测量内部接触和间隙的程度并进行统计分析（P < 0.05）。BCP组和PMMA组中的所有块均成功贴合平坦和弯曲缺损。与PMMA组（平坦缺损：0.21±0.13；弯曲缺损：0.17±0.04；P < 0.05）相比，BCP组的内部接触率显著更高（平坦缺损：0.47±0.10；弯曲缺损：0.29±0.05）。无论缺损类型如何，两组之间的内部间隙面积相似（P > 0.05）。与3D铣削的PMMA块的精度相比，3D打印的BCP块在平坦和弯曲缺损中的内部贴合精度均可靠。
