J Dent Rehabil Appl Sci.  2022 Dec;38(4):233-241. 10.14368/jdras.2022.38.4.233.

Evaluation of the dimensional change of 3D-printed complete denture after post-curing

• Lee S
• Kwak Y
• Park E
• Kim H

• KMID: 2538521
• DOI: http://doi.org/10.14368/jdras.2022.38.4.233

Abstract

Purpose
The purpose of this study was to assess the dimensional change of 3D-printed dentures after post-curing.
Materials and Methods
The upper and lower dentures were designed in Exocad DentalCAD software and exported as STL files. The upper and lower dentures were printed from 10 STL files using a DLP-type dental 3D printer. The printed upper and lower dentures were cleaned, and a scan file was created using a model scanner before and after post-curing. The dimensional change was evaluated by superimposing the scanned denture files before and after post-curing and measuring the distance between measurement points on the denture. SPSS was used for statistics, and the level of significance was 5%.
Results
The maxillary denture reduced in size during post-curing, with the most notable color change occurring in the posterior palatal region. The reduction in anteroposterior maxillary denture length (A-D, A-E, A-F), as well as the distance between the first molars on both sides (B-C), was statistically significant. After post-curing, the mandibular denture showed more noticeable color change in the posteriorly buccal and lingual region. The decrease of length on the posterior (A-M, A-D, A-E, A-L, A-H, A-I, H-I) and lingual (J-K, L-M) sides of the denture were statistically significant.
Conclusion
There was significant dimensional change in both the length and width of the 3D-printed maxillary and mandibular dentures after post-curing in this experiment. Consequently, it is seemed necessary to develop post-curing techniques and materials that reduce such denture deformation.

Keyword

post-curing; dimensional change; 3-D printed denture; length; width

Figure

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  Fig. 1 STL file of complete denture and measurement points. (A) Upper denture, (B) Lower dentue.

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  Fig. 2 Partially polymerized complete denture 3D-printed (before post-curing). (A) Upper denture, (B) Lower denture.

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  Fig. 3 Distance between measurement points of complete denture. (A) Length measurement of upper denture, (B) Width measurement of upper denture, (C) Length measurement of lower denture, (D) Width measurement of lower denture.

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  Fig. 4 Color map shows the dimensional change after post-curing. (A) Upper denture, (B) Lower denture.

Reference

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