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Variable Smear Layer and Adhesive Application: The Pursuit of Clinical Relevance in Bond Strength Testing

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Title: Variable Smear Layer and Adhesive Application: The Pursuit of Clinical Relevance in Bond Strength Testing
Authors: Chowdhury, Abu Faem Mohammad Almas Browse this author →KAKEN DB
Islam, Rafiqul Browse this author
Alam, Arefin Browse this author
Matsumoto, Mariko Browse this author →KAKEN DB
Yamauti, Monica Browse this author
Carvalho, Ricardo Marins Browse this author
Sano, Hidehiko Browse this author →KAKEN DB
Keywords: adhesion
dental bonding
smear layer
dentin-bonding agents
self-etch adhesive
universal adhesive
application mode
double application
bond strength
transmission electron microscopy
Issue Date: Nov-2019
Publisher: MDPI
Journal Title: International Journal of Molecular Sciences
Volume: 20
Issue: 21
Publisher DOI: 10.3390/ijms20215381
Abstract: The removal or modification of smear layers that cover the dentin is critical to allow the penetration of adhesive molecules and to ensure a strong bond between resin and dentin. Aiming to establish a model for clinically-relevant dentin-bond testing, we evaluated the effects of smear layers created by abrasives having similar coarseness (180-grit SiC paper; fine-grit diamond bur) and application modes (single application; double application) on the microtensile bond strengths (mu TBS) of two currently available universal adhesives (G-Premio Bond; Scotchbond Universal Adhesive) and a two-step self-etch adhesive (Clearfil Megabond 2). Sixty extracted human third molars were used for the mu TBS test. Data were analyzed by three-way ANOVA and Tukey's test (alpha = 0.05). Fracture modes were determined using stereomicroscopy. An additional 24 third molars were prepared for observation of the resin-dentin interface by TEM and adhesive-smear layer interaction by SEM. mu TBS was significantly affected by the adhesives and their application modes (p < 0.001), implying that the double application of universal adhesives should be recommended to improve their performance. The effect of smear layers was not significant (p > 0.05), indicating that 180-grit SiC papers could be used to prepare dentin as a substitute for fine-grit diamond burs for dentin-bond testing in laboratory settings.
Rights: https://creativecommons.org/licenses/by/4.0/
Type: article
URI: http://hdl.handle.net/2115/76498
Appears in Collections:歯学院・歯学研究院 (Graduate School of Dental Medicine / Faculty of Dental Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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