J Adv Prosthodont.  2021 Apr;13(2):89-99. 10.4047/jap.2021.13.2.89.

Evaluating the accuracy (trueness and precision) of interim crowns manufactured using digital light processing according to post-curing time: An in vitro study

Affiliations
  • 1Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University, Seoul, Republic of Korea
  • 2Health Science Research Institute, College of Health Science, Korea University, Seoul, Republic of Korea
  • 34RD Dental Laboratory, Seoul, Republic of Korea
  • 4Interdisciplinary Program in Precision Public Health, Korea University, Seoul, Republic of Korea

Abstract

PURPOSE
This study aimed to compare the accuracy (trueness and precision) of interim crowns fabricated using DLP (digital light processing) according to postcuring time. MATERIALS AND METHODS: A virtual stone study die of the upper right first molar was created using a dental laboratory scanner. After designing interim crowns on the virtual study die and saving them as Standard Triangulated Language files, 30 interim crowns were fabricated using a DLP-type 3D printer. Additively manufactured interim crowns were post-cured using three different time conditions-10-minute post-curing interim crown (10-MPCI), 20-minute postcuring interim crown (20-MPCI), and 30-minute post-curing interim crown (30-MPCI) (n = 10 per group). The scan data of the external and intaglio surfaces were overlapped with reference crown data, and trueness was measured using the best-fit alignment method. In the external and intaglio surface groups (n = 45 per group), precision was measured using a combination formula exclusive to scan data (10 C2). Significant differences in accuracy (trueness and precision) data were analyzed using the Kruskal-Wallis H test, and post hoc analysis was performed using the Mann-Whitney U test with Bonferroni correction (α=.05).
RESULTS
In the 10-MPCI, 20-MPCI, and 30-MPCI groups, there was a statistically significant difference in the accuracy of the external and intaglio surfaces (P <.05). On the external and intaglio surfaces, the root mean square (RMS) values of trueness and precision were the lowest in the 10-MPCI group.
CONCLUSION
Interim crowns with 10-minute post-curing showed high accuracy.

Keyword

Digital light processing; Interim crown; Trueness; Precision; Post-curing time
Full Text Links
  • JAP
Actions
Cited
CITED
export Copy
Close
Share
  • Twitter
  • Facebook
Similar articles
    DB Error: unknown error