Accuracy of 3-unit fixed dental prostheses fabricated on 3D-printed casts

Yeon Jang, Ji Young Sim, Jong Kyoung Park, Woong Chul Kim, Hae-Young Kim, Ji Hwan Kim

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Statement of problem: Three-dimensional (3D)–printed casts are used successfully as diagnostic casts in orthodontics. However, whether 3D-printed casts are sufficiently accurate to be used as definitive casts for fixed dental prostheses (FDPs) is unclear. Purpose: The purpose of this in vitro study was to evaluate the fit of 3-unit FDPs fabricated on 3D-printed casts made by digital light processing and to investigate the clinical applicability of 3D printing. Material and methods: A master model was fabricated from epoxy resin. Stone casts were made from dual viscosity impressions (conventional stone cast [CS] group, n=10). The 3D-printed casts were fabricated using a 3D printer after obtaining digital virtual casts by digital scans (3D-printed cast [3DP] group, n=10). All FDPs were fabricated with a 5-axis milling machine. The master model and intaglio surface of the milled FDPs was superimposed using 3D analysis software to measure the accuracy. Two-way ANOVA was performed to identify a significant difference between the groups (3DP and CS) and sides (pontic side, nonpontic side) and their interactive effects (α=.05). The Tukey honestly significant difference test was used for post hoc analysis. Results: Two-way ANOVA showed significant differences between the 2 groups (3DP and CS) in the marginal and internal root mean square (RMS) values (P<.001). However, no significant difference was found in the marginal RMS values (P=.762) between the pontic and nonpontic sides. The 3DP showed significantly higher RMS values than the CS (P<.001). Conclusions: The fit of FDPs produced from 3D-printed casts was inferior to that of conventional stone casts; however, all FDPs showed clinically acceptable accuracy. These results suggest that 3D-printed casts have clinical applicability but that further improvement of the 3D printer is necessary for their application in prosthodontics.

Original languageEnglish
JournalJournal of Prosthetic Dentistry
DOIs
Publication statusPublished - 2019 Jan 1

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Dental Prosthesis
Fixed Partial Denture
Analysis of Variance
Epoxy Resins
Prosthodontics
Orthodontics
Viscosity
Software
Light
Three Dimensional Printing

ASJC Scopus subject areas

  • Oral Surgery

Cite this

Accuracy of 3-unit fixed dental prostheses fabricated on 3D-printed casts. / Jang, Yeon; Sim, Ji Young; Park, Jong Kyoung; Kim, Woong Chul; Kim, Hae-Young; Kim, Ji Hwan.

In: Journal of Prosthetic Dentistry, 01.01.2019.

Research output: Contribution to journalArticle

Jang, Yeon ; Sim, Ji Young ; Park, Jong Kyoung ; Kim, Woong Chul ; Kim, Hae-Young ; Kim, Ji Hwan. / Accuracy of 3-unit fixed dental prostheses fabricated on 3D-printed casts. In: Journal of Prosthetic Dentistry. 2019.
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abstract = "Statement of problem: Three-dimensional (3D)–printed casts are used successfully as diagnostic casts in orthodontics. However, whether 3D-printed casts are sufficiently accurate to be used as definitive casts for fixed dental prostheses (FDPs) is unclear. Purpose: The purpose of this in vitro study was to evaluate the fit of 3-unit FDPs fabricated on 3D-printed casts made by digital light processing and to investigate the clinical applicability of 3D printing. Material and methods: A master model was fabricated from epoxy resin. Stone casts were made from dual viscosity impressions (conventional stone cast [CS] group, n=10). The 3D-printed casts were fabricated using a 3D printer after obtaining digital virtual casts by digital scans (3D-printed cast [3DP] group, n=10). All FDPs were fabricated with a 5-axis milling machine. The master model and intaglio surface of the milled FDPs was superimposed using 3D analysis software to measure the accuracy. Two-way ANOVA was performed to identify a significant difference between the groups (3DP and CS) and sides (pontic side, nonpontic side) and their interactive effects (α=.05). The Tukey honestly significant difference test was used for post hoc analysis. Results: Two-way ANOVA showed significant differences between the 2 groups (3DP and CS) in the marginal and internal root mean square (RMS) values (P<.001). However, no significant difference was found in the marginal RMS values (P=.762) between the pontic and nonpontic sides. The 3DP showed significantly higher RMS values than the CS (P<.001). Conclusions: The fit of FDPs produced from 3D-printed casts was inferior to that of conventional stone casts; however, all FDPs showed clinically acceptable accuracy. These results suggest that 3D-printed casts have clinical applicability but that further improvement of the 3D printer is necessary for their application in prosthodontics.",
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