The Journal of Advanced Prosthodontics

The Korean Academy of Prosthodonitics (대한치과보철학회)
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Effect of internal structures on the accuracy of 3D printed full-arch dentition preparation models in different printing systems

  • Teng Ma (Yantai Stomatological Hospital of Binzhou Medical University) ;
  • Tiwu Peng (School of Stomatology, Binzhou Medical University) ;
  • Yang Lin (School of Public Health and Management, Binzhou Medical University) ;
  • Mindi Zhang (School of Stomatology, Binzhou Medical University) ;
  • Guanghui Ren (Yantai Stomatological Hospital of Binzhou Medical University)
  • Received : 2023.03.29
  • Accepted : 2023.06.20
  • Published : 2023.06.30
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Abstract

PURPOSE. The objective of this study was to investigate how internal structures influence the overall and marginal accuracy of full arch preparations fabricated through additive manufacturing in different printing systems. MATERIALS AND METHODS. A full-arch preparation digital model was set up with three internal designs, including solid, hollow, and grid. These were printed using three different resin printers with nine models in each group. After scanning, each data was imported into the 3D data processing software together with the master cast, aligned and trimmed, and then put into the 3D data analysis software again to compare the overall and marginal deviation whose results are expressed using root mean square values and color maps. To evaluate the trueness of the resin model, the test data and reference data were compared, and the precision was evaluated by comparing the test data sets. Color maps were observed for qualitative analysis. Data were statistically analyzed by one-way analysis of variance and Bonferroni method was used for post hoc comparison (α = .05). RESULTS. The influence of different internal structures on the accuracy of 3D printed resin models varied significantly (P < .05). Solid and grid models showed better accuracy, while the hollow model exhibited poor accuracy. The color maps show that the resin models have a tendency to shrink inwards. CONCLUSION. The internal structure design influences the accuracy of the 3D printing model, and the effect varies in different printing systems. Irrespective of the kind of printing system, the printing accuracy of hollow model was observed to be worse than those of solid and grid models.

Keywords

Acknowledgement

The authors thank Huaxin Dental Lab and Department of Dental Technology of Yantai Stomatological Hospital for their support in model printing and scanning, as well as Huaxin Wang, Xinxin Liu, and Jing Zhang for their help in this study.

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