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KMID : 1004520230390020079
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Journal of Dental Rehabilitation and Applied Science
2023 Volume.39 No. 2 p.79 ~ p.88
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Comparison of shear bond strength between hard relining material and 3D-printing denture base resin containing silica micro-gel
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Lee Yeon-Woo
Song Young-Gyun
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Abstract
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Purpose: Various methods have been attempted to overcome limitations of physical characteristics of 3D-printed dentures; among them a novel method of increasing fracture strength by adding fine particles into the resin has been found to be effective. However, there are still limited research on the effect of these particles on the bond strength between the printed resin and denture relining materials. The purpose of this study is to compare the shear bond strength between the 3D-printing denture base resin and various relining materials when micro-particles on the surface of the resin are removed.
Materials and Methods: 63 μm-sized silica microgels were mixed into 3D-printing denture base resin to make groups of weight ratio of 2 wt% and 3 wt%. After printing all 3 groups, including the control group, an HF etching solution was applied to dissolve the silica micro-particles on the surface. Three kinds of relining materials, Tokuyama Rebase II normal, KOOLINER, and ProBase Cold were attached to the surface. The shear bond strength values and the failure modes for each group were analyzed.
Results: The shear bond strength showed the largest average value in the control group, in which silica was not mixed, among all three relining materials. Also, there were significant differences between specimens with different weight ratios. The largest value was measured in ProBase Cold, and the main failure mode was adhesive failure in all groups.
Conclusion: The shear bond strength was significantly reduced when the silica micro-particles on the surface were removed from the 3D printing denture base resin.
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KEYWORD
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3D printing, denture bases, denture relining, microgels, shear strength
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