Farahat Amany Mostafa Saad, Refai Omnia M, Elsherbeeny Yasmine Said
Lecturer, Department of Oral and Maxillofacial Prosthodontics, Faculty of Dentistry, Ain Shams University, Cairo, Egypt.
Lecturer, Department of Oral and Maxillofacial Prosthodontics, Faculty of Dentistry, Ain Shams University, Cairo, Egypt.
J Prosthet Dent. 2025 Mar;133(3):846.e1-846.e8. doi: 10.1016/j.prosdent.2024.12.004. Epub 2024 Dec 18.
Duplicating complete dentures and achieving accurately fitting prostheses poses a challenge. Conventional methods are often time-consuming and susceptible to human error. Advancements in digital technology for denture fabrication offer a promising alternative to conventional duplication techniques, but studies comparing the methods are lacking.
The purpose of this in vitro study was to compare the trueness of duplicated complete dentures using 3-dimensional (3D) printing technology with that of dentures duplicated using the conventional method.
A typodont was used to construct a maxillary complete denture using the conventional method. The denture was scanned using a desktop scanner, and the standard tessellation language (STL) file was considered the reference file. Each denture was duplicated using 3 techniques (10 in each group). In the first group, the denture was duplicated using the conventional technique; in the second group, the denture was printed as a single unit (monolithic) from a tooth-colored resin, and the denture flange was then veneered with pink resin; in the third group, the denture base was printed separately from the pink resin, and the teeth were printed as a single unit using tooth-colored resin. The denture base and the teeth were co-related using a positioning device. The duplicate dentures in the 3 groups were scanned, and the STL files were imported into a surface-matching software program to evaluate their trueness. Statistical analysis was done using 1-way ANOVA followed by the Tukey post hoc test (α=.05).
A significant difference (P<.001) was found in the trueness of the 3 duplication techniques, with the highest overall deviation recorded in the conventional denture group (0.73 ±0.06 mm) and the least deviation recorded in the monolithic denture group (0.21 ±0.04 mm). Deviations in the canine, first molar, and maxillary tuberosities were the lowest in the monolithic denture group (0.13 ±0.01 mm), (0.11 ±0.03 mm), (0.27 ±0.05 mm), respectively.
Using 3D printing technology for complete denture duplication has a promising outcome with the highest trueness reported with the monolithic denture. Comparative clinical studies are needed.
复制全口义齿并获得精确贴合的修复体是一项挑战。传统方法通常耗时且易受人为误差影响。用于义齿制作的数字技术进步为传统复制技术提供了一种有前景的替代方法，但缺乏比较这些方法的研究。
本体外研究的目的是比较使用三维（3D）打印技术复制的全口义齿与使用传统方法复制的义齿的准确性。
使用典型牙模通过传统方法制作上颌全口义齿。使用台式扫描仪对义齿进行扫描，标准镶嵌语言（STL）文件被视为参考文件。每组使用3种技术复制10副义齿（每组10副）。第一组，使用传统技术复制义齿；第二组，用牙齿颜色的树脂将义齿整体打印出来，然后用粉色树脂覆盖义齿边缘；第三组，义齿基托与粉色树脂分开打印，牙齿用牙齿颜色的树脂整体打印。义齿基托和牙齿使用定位装置进行关联。对3组中的复制义齿进行扫描，并将STL文件导入表面匹配软件程序以评估其准确性。使用单因素方差分析（ANOVA），然后进行Tukey事后检验（α = 0.05）进行统计分析。
发现3种复制技术在准确性上存在显著差异（P <.001），传统义齿组记录的总体偏差最高（0.73±0.06毫米），整体式义齿组记录的偏差最小（0.21±0.04毫米）。整体式义齿组中尖牙、第一磨牙和上颌结节处的偏差最低，分别为（0.13±0.01毫米）、（0.11±0.03毫米）、（0.27±0.05毫米）。
使用3D打印技术复制全口义齿有良好前景，整体式义齿的准确性最高。需要进行比较性临床研究。
