Lecturer, Department of Restorative Dentistry, Stomatological Hospital of Chongqing Medical University, Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, PR China.
Professor, School of Management Science and Engineering, Chongqing Technology and Business University, Chongqing, PR China.
J Prosthet Dent. 2022 Nov;128(5):897-904. doi: 10.1016/j.prosdent.2021.02.011. Epub 2021 Mar 29.
Evidence comparing the marginal and internal fit of single metal copings fabricated via selective laser sintering and conventional lost-wax casting is inadequate.
The purpose of this systematic review was to compare the fit of single metal copings fabricated via selective laser sintering and lost-wax casting. Moreover, the effects of different variables on fit accuracy were determined.
Google Scholar, ScienceDirect, SpringerLink, and Wiley databases were searched electronically as well as manually. The mean absolute marginal gap, marginal gap, internal gap, axial gap, and occlusal gap values of single metal copings fabricated via selective laser sintering and lost-wax casting were statistically analyzed to determine and evaluate the factors affecting the fit accuracy (α=.05).
Single metal copings fabricated via selective laser sintering had mean absolute marginal gaps and occlusal gaps similar to those of copings fabricated via lost-wax casting, based on a subgroup meta-analysis of gaps evaluated using stereomicroscopy (P>.05). The fit of single metal copings was not affected by the type of tooth (P>.05). The conventional impression, the indirect digital scan, and the direct digital scan led to similar values of mean axial gap, internal gap, and marginal gap for the copings fabricated via lost-wax casting (P>.05). The indirect and direct digital scans led to similar values of mean axial gap, internal gap, and marginal gap for the copings fabricated via selective laser sintering (P>.05). Printed wax patterns provided significantly smaller mean axial gap values than milled plastic or milled wax patterns for the copings fabricated via lost-wax casting (P<.05). Printed, milled, and conventional wax patterns had similar mean marginal gaps and internal gaps for the copings fabricated via lost-wax casting (P>.05). For single copings fabricated via lost-wax casting, Ni-Cr and Co-Cr had similar mean internal gaps (P>.05).
No statistically significant differences were found between single metal copings fabricated via selective laser sintering and lost-wax casting. Selective laser sintering can satisfy the clinical requirement for single metal copings.
比较选择性激光烧结和传统失蜡铸造制作的单金属冠边缘和内部适合性的证据不足。
本系统评价的目的是比较选择性激光烧结和失蜡铸造制作的单金属冠的适合性。此外，还确定了不同变量对拟合精度的影响。
电子检索 Google Scholar、ScienceDirect、SpringerLink 和 Wiley 数据库，并进行手动检索。对选择性激光烧结和失蜡铸造制作的单金属冠的平均绝对边缘间隙、边缘间隙、内部间隙、轴向间隙和牙合间隙值进行统计学分析，以确定和评估影响拟合精度的因素（α=.05）。
基于使用立体显微镜评估的间隙的亚组荟萃分析，选择性激光烧结制作的单金属冠的平均绝对边缘间隙和牙合间隙与失蜡铸造制作的冠相似（P>.05）。单金属冠的适合性不受牙齿类型的影响（P>.05）。传统印模、间接数字扫描和直接数字扫描导致失蜡铸造制作的冠的平均轴向间隙、内部间隙和边缘间隙值相似（P>.05）。间接和直接数字扫描导致选择性激光烧结制作的冠的平均轴向间隙、内部间隙和边缘间隙值相似（P>.05）。对于失蜡铸造制作的冠，打印蜡型的平均轴向间隙值明显小于铣削塑料或铣削蜡型（P<.05）。打印、铣削和传统蜡型的失蜡铸造制作的冠具有相似的平均边缘间隙和内部间隙（P>.05）。对于失蜡铸造制作的单冠，Ni-Cr 和 Co-Cr 具有相似的平均内部间隙（P>.05）。
选择性激光烧结和失蜡铸造制作的单金属冠之间没有发现统计学上的显著差异。选择性激光烧结可以满足单金属冠的临床要求。
