What question did this study set out to answer?

To evaluate the effects of various relining materials and surface treatment protocols on the shear bond strength of conventional PMMA, SLA, and DLP 3D-printed denture bases.

August 16, 2026European Journal of DentistryOpen Access

Effects of Relining Materials and Surface Treatments on Shear Bond Strength of 3D-Printed Dentures

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Authors

PTPichamon TharanathamNaresuan University AKAwutsadaporn KathengNaresuan University

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Implication

In vitro study demonstrates that air-particle abrasion and matching resins optimize shear bond strength in 3D-printed denture bases, indicating superior protocols for denture relining.

Key Points

To evaluate the effects of various relining materials and surface treatment protocols on the shear bond strength of conventional PMMA, SLA, and DLP 3D-printed denture bases.
Fabricated denture base specimens from conventional heat-polymerized PMMA (n = 96), SLA resin (n = 128), and DLP resin (n = 128) following ISO 9653:1998, followed by 5,000 thermocycles.
Assigned specimens to four surface treatments (untreated control, air-particle abrasion, monomer treatment, or combination) and relined them with auto-polymerizing PMMA, PEMA-based resins, or matching 3D-printed resins (n = 8 per subgroup).
Assessed shear bond strength using a universal testing machine and examined failure modes and surface topography with stereomicroscopy and scanning electron microscopy.
Surface treatment, relining material, and their interaction significantly influenced shear bond strength in all groups (p < 0.05).
Air-particle abrasion generally yielded the highest shear bond strength across all base materials, whereas untreated controls produced the lowest values.
The highest bond strength values occurred with Unifast Trad Pink in conventional PMMA and with the corresponding 3D-printed resins in SLA and DLP groups, with mixed failures predominating.

Cite This Study

Tharanatham et al. (2026) studied this question.

synapsesocial.com/papers/6a8179bcf2fb91fc834ad12c https://doi.org/10.1055/s-0046-1827026

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Implication

In vitro study demonstrates that air-particle abrasion and matching resins optimize shear bond strength in 3D-printed denture bases, indicating superior protocols for denture relining.

Effects of Relining Materials and Surface Treatments on Shear Bond Strength of 3D-Printed Dentures

Discussion

Member takes

Implication

Key Points

Cite This Study

Effects of Relining Materials and Surface Treatments on Shear Bond Strength of 3D-Printed Dentures

Discussion

Member takes

Implication

Key Points

Cite This Study

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