常规铣削和新型混合全口种植体支持钛框架的界面不匹配。
Interface misfit of conventionally milled and novel hybrid full-arch implant-supported titanium frameworks.
机构信息
Department of Oral Implantology, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Disease & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, 22 Zhongguancun South Avenue, Beijing, Haidian District, 100081, China.
Shenzhen Xiangtong Optoelectronics Technology Co., Ltd, Shenzhen, 518000, China.
出版信息
BMC Oral Health. 2024 Oct 10;24(1):1205. doi: 10.1186/s12903-024-04973-5.
OBJECTIVE
A hybrid manufacturing technique that combines selective laser melting (SLM) and computer numerical control (CNC) has been developed for the fabrication of implant-platform/framework interfaces (PFIs) for mandibular and maxillary full-arch implant-supported titanium frameworks. The aim of this study was to compare the discrepancies in specimens fabricated using the hybrid technique (termed SLM/m hereafter) with those in specimens fabricated by conventional CNC milling.
MATERIALS AND METHODS
Based on a mandibular four-PFI CAD model and a maxillary six-PFI CAD model, four groups of titanium frameworks (eight per group, totaling 32) were fabricated according to the fabrication technique (SLM/m or milling) and number of PFIs (four or six). The frameworks were scanned by a structured light scanner and aligned with the CAD model in Geomagic Control X. Discrepancy was defined as the difference between the PFIs of the scanned framework and those of the CAD model. Discrepancies were measured and evaluated by multilevel analysis using a mixed-effects model (α = 0.05), followed by independent samples t-tests (α = 0.0125). Furthermore, the manufacturing times and raw-material costs were recorded and compared.
RESULTS
The maximum discrepancy values for the four-PFI and six-PFI hybrid frameworks were 52.2 and 64.3 μm, respectively. Multilevel analysis revealed that the fabrication technique and the number of PFIs had no significant effect on the discrepancy value. However, a significant interaction between the two factors was observed (P = 0.020). The discrepancies for the four-PFI hybrid frameworks were significantly lower than those for the four-PFI milled frameworks (P = 0.001). No significant difference in discrepancies between the six-PFI hybrid frameworks and six-PFI milled frameworks was observed (P = 0.697). Furthermore, the hybrid frameworks required only 11% of the raw materials and 25% of the milling time required for the conventionally milled frameworks.
CONCLUSION
SLM/m hybrid frameworks are viable, accurate alternatives to CNC-milled frameworks, with the added benefit of substantial cost reduction.
目的
为了制造下颌和上颌全口种植体支持钛框架的种植体平台/框架接口（PFIs），开发了一种将选择性激光熔化（SLM）和计算机数控（CNC）相结合的混合制造技术。本研究的目的是比较使用混合技术（以下称为 SLM/m）制造的样本与使用传统 CNC 铣削制造的样本之间的差异。
材料和方法
根据下颌四个 PFI CAD 模型和上颌六个 PFI CAD 模型，根据制造技术（SLM/m 或铣削）和 PFI 数量（四个或六个）制造了四组钛框架（每组八个，共 32 个）。通过结构光扫描仪扫描框架，并在 Geomagic Control X 中与 CAD 模型对齐。差异定义为扫描框架的 PFI 与 CAD 模型的 PFI 之间的差异。使用混合效应模型（α=0.05）进行多层次分析来测量和评估差异，然后进行独立样本 t 检验（α=0.0125）。此外，记录并比较了制造时间和原材料成本。
结果
四 PFI 和六 PFI 混合框架的最大差异值分别为 52.2 和 64.3μm。多层次分析表明，制造技术和 PFI 数量对差异值没有显著影响。但是，两个因素之间存在显著的相互作用（P=0.020）。四 PFI 混合框架的差异明显低于四 PFI 铣削框架（P=0.001）。六 PFI 混合框架和六 PFI 铣削框架之间的差异无显著差异（P=0.697）。此外，混合框架仅需要传统铣削框架所需原材料的 11%和铣削时间的 25%。
结论
SLM/m 混合框架是 CNC 铣削框架的可行、准确替代品，具有显著降低成本的额外优势。
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