Comparison of shrinkage according to thickness of photopolymerization resin for 3D printing

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This study aimed to analyze deformation according to post-curing of complete arch artificial teeth for temporary dentures printed with a digital light processing (DLP) printer.Methods: An edentulous model was prepared and an occlusal rim was produced. The edentulous model and occlusal rim were scanned using a model scanner. A complete denture was designed using a dental computer-aided design, and the denture base and artificial tooth were separated. Ten complete arch artificial teeth were printed using a 3D printer (DLP). Complete arch artificial teeth was classified into the following three groups: a group no post-curing (NC), a group with 10 minutes post-curing (10M), and a group with 20 minutes post-curing (20M). Specimens were scanned using a model scanner. The scanned data were overlapped with the reference data. Statistical analysis was performed using one-way ANOVA analysis of variance, Kruskal-Wallis test, and Mann-Whitney U test (α=0.05).Results: Regarding the overall deviation of complete arch artificial teeth, the NC group showed the lowest mean deviation of 111.13 µm and the 20M group showed the highest mean deviation of 131.03 µm. There were statistically significant differences among the three groups (p<0.05). Conclusion:The complete arch artificial tooth showed deformation due to post-curing. In addition, the largest shrinkage deformation was observed at 10 minutes of post-curing, whereas the least deformation was observed at 20 minutes.

Analysis of deformation according to post-curing of complete arch artificial teeth for temporary dentures printed with a DLP printer

Kim¹,

Lee

2021

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Comparison of polymerization by time of light curing for dental 3D printing

Kim

Lee

2022

Self Cite

Results:The third group had the largest measurement length, whereas the first group had the smallest. However, the difference between groups was not statistically significant (p>0.05). The color of the first group was different from that of the second and third groups. Conclusion:All of the 4-mm-thick photocured specimens had a curing reaction, but the part that was not directly irradiated with UV did not show its original color.

An evaluation of marginal fit of resin single crown manufactured using a dental 3D printer

Kim

2022

Results: According to the experimental results, the mean marginal fit of the 3DP group was 71.9 μm, and the LWC group was 55.3 μm. The means of the two groups were found to be significantly different (p<0.001) in the results of the independent sample t-test. Conclusion:The marginal fit of fixed dental prostheses produced by 3DP technology was examined with values greater than those fabricated by traditional technology. However, as it appeared to be a value within the range of clinically acceptable range recommended by numerous studies, it was determined that clinical application would be feasible.