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>Comparison of Conventional Methods and Laser-Assisted Rapid Prototyping for Manufacturing Fixed Dental Prostheses: An In Vitro Study
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Comparison of Conventional Methods and Laser-Assisted Rapid Prototyping for Manufacturing Fixed Dental Prostheses: An In Vitro Study
This study assessed whether there are differences in marginal fit between laser-fusion and conventional techniques to produce fixed dental prostheses (FDPs). A master steel die with 2 abutments was produced to receive a posterior 4-unit FDPs and single copings. These experimental models were divided into three groups (n = 20/group) manufactured: group 1, Ni-Cr alloy, with a lost-wax casting technique; group 2, Co-Cr alloy, with selective laser melting (SLM); and group 3, yttria-tetragonal zirconia polycrystal (Y-TZP), with a milling system. All specimens were cut along the longitudinal axis and their adaptation was measured at the marginal and shoulder areas on the right and left sides of each abutment. Measurements were made using a stereomicroscope (×60 magnification) and a scanning electron microscope (×800 magnification). The data were analyzed using one-way analysis of variance and the Bonferroni post hoc test, with a significance cutoff of 5%. Significant differences (P < 0.05) were observed between group 3 and the other groups. The marginal opening was smallest with Co-Cr alloy substructures, while the shoulder opening was smallest with Ni-Cr alloy substructures. Within the limitations of this study, the marginal fit of an FDP is better with rapid prototyping (RP) via SLM than conventional manufacturing systems.
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机译：这项研究评估了激光融合与传统技术在生产固定式牙修复体（FDP）之间的边缘配合是否存在差异。制作了带有2个基台的钢制主模，以接收后4单元FDP和单顶盖。将这些实验模型分为三组（n = 20 /组）：第一组，采用失蜡铸造技术的Ni-Cr合金；第2组Co-Cr合金，具有选择性激光熔化（SLM）；第3组，氧化钇-四方氧化锆多晶体（Y-TZP），带有研磨系统。沿纵轴切割所有标本，并在每个基台右侧和左侧的边缘和肩部区域测量其适应性。使用体视显微镜（×60放大率）和扫描电子显微镜（×800放大率）进行测量。使用单向方差分析和Bonferroni post hoc检验分析数据，显着性临界值为5％。第三组与其他组之间存在显着差异（P <0.05）。边缘开口在Co-Cr合金子结构中最小，而肩部开口在Ni-Cr合金子结构中最小。在本研究的范围内，通过SLM进行快速原型设计（RP）的FDP的边际拟合度比常规制造系统更好。
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