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KMID : 1035320230500010029
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Korean Society for Dental Materials
2023 Volume.50 No. 1 p.29 ~ p.46
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Effect of microstructure of reinforced CAD/CAM hybrid composite resin block on shear bond strength of composite resin
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Um Sung-Ho
Shin Min-Jeong
Chung Shin-Hye
Park Young-Seok
Lim Bum-Soon
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Abstract
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The shear bond strength of the composite resin to a CAD/CAM hybrid composite resin block(CRB) can be affected by thecomposition and microstructure of the hybrid CRB, surface treatment and the properties of the applied adhesive. In this study,the shear bond strengths between composite resin and the hybrid CRBs were measured to evaluate the effect of microstructuredifferences in hybrid CRBs on the bond strength. Ten conventional and reinforced hybrid CRBs developed by five domesticand international manufacturersand five universal adhesives currently used in dentistry were selected. After polishing the hybridCRB surface, the specimens were divided into two groups. The first group was HF-treated to observe the microstructure byFE-SEM, and the second group was sandblasted with alumina, measured the surface roughness by CLSM, bonded with compositeresin (diameter = 2.0mm) using universal adhesive, and stored in a 37 ℃ water bath for 24 hours, and measured the shearbond strength using a universal testing machine. The measured values were statistically analyzed using the Tukey-multiple comparisontest (α= 0.05). It was observed that the size, type, and fraction of the filler particles contained in the regular and reinforcedhybrid CRBs affected the microstructure, but the differences did not affect the shear bond strength. All five universal adhesivescontaining 10-MDP as the main functional monomer met the minimum bond strength (>20 MPa) required for clinical applications.
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KEYWORD
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Hybrid composite resin block, reinforced, surface roughness, universal adhesive, shear bond strength
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