Doctoral student, Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University, Seoul, Republic of Korea.
Graduate student, Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University, Seoul, Republic of Korea.
J Prosthet Dent. 2022 Jan;127(1):108-114. doi: 10.1016/j.prosdent.2020.09.027. Epub 2020 Nov 22.
Computer-aided design and computer-aided manufacturing (CAD-CAM) systems are increasingly used to fabricate removable complete dentures. However, comparisons and analyses of the trueness and adaptation of the socketed surface of denture bases produced by milling (MIL) and digital light processing (DLP) are lacking.
The purpose of this in vitro study was to evaluate and compare the trueness and socketed surface adaptation of denture bases fabricated by using additive and subtractive manufacturing.
Based on a denture base standard tessellation language (STL) file, a total of 15 denture bases were produced by using DLP (horizontal and vertical direction) and MIL. The intaglio and cameo surfaces of the fabricated denture bases were scanned with a dental scanner. The scanned intaglio and cameo surfaces were overlapped with the corresponding reference denture base STL file for trueness evaluation. In addition, the ridge lap STL file of the diagnostic tooth arrangement, in which reverse normal was performed, was superimposed on the socketed surface of the denture base of all groups to evaluate adaptation.
The root mean square (RMS) values of trueness and adaptation showed statistically significant differences (P<.05). For the trueness RMS value of the intaglio surface of the denture base, the MIL-denture base (MDB) group had the lowest value of 150 ±6 μm, whereas the vertical denture base (VDB) of the DLP group was the largest with 328 ±4 μm. For the trueness RMS value of the cameo surface, the MDB group was the lowest with 50 ±1 μm, whereas the VDB group was the largest with 334 ±24 μm. For the adaptation RMS value of the socketed surface of the denture base, the MDB group was the lowest with 44 μm, whereas the VDB group was the largest with 117 ±2 μm.
Within the limits of this in vitro study, the MDB group showed better trueness and socketed surface adaptation than the DLP groups (HDB and VDB).
计算机辅助设计和计算机辅助制造（CAD-CAM）系统越来越多地用于制作可摘局部义齿。然而，对于铣削（MIL）和数字光处理（DLP）制作的义齿基托的套接表面的准确性和适应性的比较和分析还很缺乏。
本体外研究的目的是评估和比较使用增材和减材制造制作的义齿基托的准确性和套接表面适应性。
基于义齿基托标准三角测量语言（STL）文件，使用 DLP（水平和垂直方向）和 MIL 共制作了 15 个义齿基托。用牙科扫描仪扫描制作的义齿基托的凹面和凸面。将扫描的凹面和凸面与相应的参考义齿基托 STL 文件重叠，以进行准确性评估。此外，将进行反向法向的诊断牙列的牙槽嵴顶 STL 文件叠加到所有组的义齿基托的套接表面上，以评估适应性。
准确性和适应性的均方根（RMS）值显示出统计学上的显著差异（P<.05）。对于义齿基托凹面的准确性 RMS 值，MIL 义齿基托（MDB）组的最低值为 150±6μm，而 DLP 组的垂直义齿基托（VDB）最大为 328±4μm。对于凸面的准确性 RMS 值，MDB 组的最低值为 50±1μm，而 DLP 组的 VDB 最大为 334±24μm。对于义齿基托套接表面的适应性 RMS 值，MDB 组的最低值为 44μm，而 DLP 组的 VDB 最大为 117±2μm。
在本体外研究的范围内，MDB 组显示出比 DLP 组（HDB 和 VDB）更好的准确性和套接表面适应性。
