The Effect of Resin Type, Preparation Design, and Location on the Marginal Adaptation of 3D-Printed Onlays: In Vitro Study

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This study aims to compare the marginal adaptations of onlay restorations produced using two different 3D printing resins and preparation techniques.
80 restorations produced using two different 3D printing resins (Crowntec and VarseoSmile Crown Plus)
Samples divided into four groups based on resin type and preparation design
Marginal gaps measured under stereomicroscope at 18 points, analyzed using ANOVA and Tukey's post hoc test
Statistical differences found between resins (p<0.05)
Crowntec groups displayed different marginal gap values than VarseoSmile Crown Plus groups
Flat preparations showed smaller gaps than shoulder preparations, but not statistically significant (p>0.05)

In Vitro Study Reveals Resin Type and Location Impact Marginal Adaptation of 3D-Printed Onlays, Suggesting Design Considerations.

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Yiğin et al. (2026) studied this question.

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