García-Gil Ignacio, Rodríguez Alonso Verónica, Tobar Arribas Celia, Mosaddad Seyed Ali, Peláez Jesús, Suárez María J
Department of Conservative Dentistry and Bucofacial Prosthesis, Faculty of Odontology, Complutense University of Madrid, 28040 Madrid, Spain.
Department of Research Analytics, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai 600077, India.
Materials (Basel). 2025 May 12;18(10):2246. doi: 10.3390/ma18102246.
Printed cast models are becoming increasingly important in prosthodontics. The aim of this in vitro study was to evaluate the influence of print orientation and external shell thickness on the accuracy of stereolithography (SLA) master casts for fixed dental prostheses. Seventy-two maxillary hollow master casts were fabricated from a standard tessellation language (STL 0) reference file containing dental preparations. The casts were divided into six groups (n = 12 per group) according to internal shell thickness (2 mm and 4 mm) and print orientation (0°, 10°, and 20°). Discrepancies between STL 0 and the STL files of the printed casts were measured using the root mean square (RMS) error. Data were statistically analyzed using a one-way Kruskal-Wallis test to assess trueness, and precision was evaluated with the Levene test (α = 0.05). No statistically significant differences were found in any of the tested conditions. Print orientation and cast thickness did not influence the overall accuracy of SLA master casts for fixed dental prostheses.
打印铸造模型在口腔修复学中变得越来越重要。这项体外研究的目的是评估打印方向和外壳厚度对固定义齿立体光刻（SLA）母模精度的影响。从包含牙体预备的标准镶嵌语言（STL 0）参考文件制作了72个上颌中空母模。根据内壳厚度（2毫米和4毫米）和打印方向（0°、10°和20°）将铸模分为六组（每组n = 12）。使用均方根（RMS）误差测量STL 0与打印铸模的STL文件之间的差异。使用单向Kruskal-Wallis检验对数据进行统计分析以评估准确性，并使用Levene检验评估精密度（α = 0.05）。在任何测试条件下均未发现统计学上的显著差异。打印方向和铸模厚度不会影响固定义齿SLA母模的整体精度。
