Evaluation of Internal Fit of Three-Dimensional Provisional Crowns Printed with Different Orientations and Different Post Curing Time Protocols: An in-Vitro Study

Document Type : Original Article

Authors

1 fixed prosthodontics department

2 professor in fixed prosthodontics department

Abstract

The effect of 3D printing parameters including different Orientations and post curing time protocols on the internal fit of 3D printed provisional crowns is not clear.
Aim: This current study is to investigate the effect of three different printing orientations and two different post curing time protocols on the internal fit of provisional
printed crowns. Methods: A ready-made model of an upper first premolar tooth was
scanned. 30 dies were printed using. One of the printed dies was scanned. The design
of crown was made. 30 crowns were printed. 18 Provisional crowns were divided into
3 groups (n= 6) according to the printing orientation used: group A (0˚), group B (90˚)
and group C (30˚). 12 crowns were divided into 2 groups(n=6) according to the post
curing time protocol used: group F (20 min), group G (40 min). Internal fit was measured using stereomicroscope. The effect of different printing orientations and post curing time protocols was statistically analyzed by using One-way ANOVA and independent T-test using IBM SPSS version 26.0. Results: There was a statistically significant
difference in mean internal gap among the three groups (p≤0.05). The highest mean
internal gap was reported by Group A. The lowest mean internal gap was reported by
group C. There was no statically significant difference between group F and group G.
Conclusion: Changing Printing orientations had an impact on internal fit of provisional
restoration but changing post curing time protocols (20 min or 40 min) had no effect.

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Dental Science Updates
Volume 6, Issue 2
September 2025
Pages 378-386

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