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The Effect of Various Surface Treatments and Joint Designs on the Flexural Strength of Repaired 3D-Printed Denture Base: In Vitro Study

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Abstract:

This study investigates the effect of different joint designs and surface treatments on the flexural strength of a 3D-printed resin denture base. Seventy specimens of 3D-printed resin were used in this study, these specimens were grouped according to the joint design into four groups (positive control group, butt-joint group, bevel-joint group, and round-joint group) except the positive control group each one of these groups is subgroup into another three groups according to the surface treatment material into heat-cured monomer (MMA), sandblast, and 3-D printed resin. The specimens were cut in the middle according to the joint shape, and the cut surfaces were treated with heat-cured MMA monomer, sandblast, and 3D-printed resin (as a negative control group). Then a silicone mold was used to prepare the specimens with 3D printed resin, using a light-emitting diode, and post-cured with a light-cured unit box. An Instron testing machine examines all specimens. The bevel-joint group repaired with 3D printed resin (G7) had the highest mean flexural strength (85.0483) MPa and a significant difference from the control group. For fixing a fractured denture base made of 3D-printed resin, the bevel-joint design is the most recommended design of the joint, and the best material for treatment is 3D-printed resin. Then a round-joint with heat-cured monomer and the butt-joint with 3D-printed resin treatment.

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Periodical:

Engineering Headway (Volume 30)

Pages:

21-30

DOI:

https://doi.org/10.4028/p-Ijn3p5

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Online since:

January 2026

Authors:

Ebaa Enad Hameed*, Ihab Nafea Yassen, Ammar Arab Beddai

Keywords:

3D-Printed Resin, Flexural Strength, Joint Design, Surface Treatment

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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