Department of Removable Partial Prosthodontics, Tokyo Dental College, Tokyo, Japan; Oral Health Science Center, Tokyo Dental College, Tokyo, Japan.
Department of Removable Partial Prosthodontics, Tokyo Dental College, Tokyo, Japan.
J Prosthodont Res. 2020 Apr;64(2):224-230. doi: 10.1016/j.jpor.2019.07.009. Epub 2019 Aug 26.
The present study aimed to compare the accuracy of removable partial denture (RPD) frameworks fabricated by 3D-printed pattern casting and those fabricated by selective laser sintering (SLS).
A partially edentulous mandibular model was used for the simulation model. Scanning of the model was performed using a dental scanner. The framework was designed by using CAD software. The 3D-printed resin pattern was formed using a 3D printer and casting was performed (AM-Cast framework), and a direct metal laser sintering machine was used for the framework of SLS (SLS framework). 3D scanning of fabricated two types of framework were performed, and these data were overlapped with design data. Fabrication accuracy was verified using the Mann-Whitney U test to compare the discrepancy between the AM-Cast and SLS frameworks.
The range of differences for the AM-Cast and SLS framework were -0.185±0.138 to 0.352±0.143mm and -0.166±0.009 to 0.123±0.009mm, respectively. Statistically significant differences were observed at the rests, proximal plates, connectors, and clasp arms. Regarding the rests, both lateral and medial displacement in the two types framework was observed in relation to the design data. Large lateral discrepancies of the connectors were observed at the joining area on the tooth-supported side of the lingual bar for the AM-Cast framework. Localized discrepancies were observed at the center of the lingual bar for the SLS framework.
The accuracies of RPD frameworks fabricated by AM-Cast and SLS differ depending on the specific structural component of the RPD.
本研究旨在比较通过 3D 打印图案铸造和选择性激光烧结（SLS）制造的可摘局部义齿（RPD）架的准确性。
使用部分缺牙下颌模型作为模拟模型。使用牙科扫描仪对模型进行扫描。使用 CAD 软件设计支架。使用 3D 打印机形成 3D 打印树脂图案，并进行铸造（AM-Cast 支架），并使用直接金属激光烧结机制造 SLS 支架（SLS 支架）。对两种类型的已制造支架进行 3D 扫描，并将这些数据与设计数据重叠。使用曼-惠特尼 U 检验比较 AM-Cast 和 SLS 支架之间的差异来验证制造精度。
AM-Cast 和 SLS 支架的差异范围分别为-0.185±0.138 至 0.352±0.143mm 和-0.166±0.009 至 0.123±0.009mm。在休息处、近中板、连接器和卡环臂处观察到统计学上的显著差异。关于休息处，两种类型的支架在设计数据中都观察到了侧向和近中向的移位。在 AM-Cast 支架的舌侧杆牙支持侧的连接区域观察到连接器的大侧向差异。在 SLS 支架的中心观察到局部差异。
通过 AM-Cast 和 SLS 制造的 RPD 架的准确性取决于 RPD 的特定结构组件。
