Shear Bond Strength of Composite Diluted with Composite-Handling Agents on Dentin and Enamel

• Published in: Polymers Vol. 14; no. 13; p. 2665
• Main Authors: Kim, Mijoo, Jo, Deuk-Won, Khalifah, Shahed Al, Yu, Bo, Hayashi, Marc, Kim, Reuben H
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 30.06.2022; MDPI
• Subjects: Acrylic resins; Adhesive strength; Adhesives; Bond strength; Bonding strength; Composite materials; composite-handling agents; Curing; dental composite; Dentin; Enamel; Mixtures; modeling resin; sculpturing resin; Shear; shear bonding strength; Standard deviation; Statistical analysis; Substrates; Teeth; Variance analysis; Wetting; wetting resin; United States > US; Germany; Chicago Illinois; dental composite; modeling resin; shear bonding strength; composite-handling agents; wetting resin; sculpturing resin
• ISSN: 2073-4360; 2073-4360
• DOI: 10.3390/polym14132665

This in vitro study aimed to examine the shear bond strength of composite on the dentin and enamel substrates when mixed with different composite-handling agents (CHAs). Eighty extracted molars were embedded into acrylic resin and sectioned sagittally. On the prepared specimens, four groups of resin mixtures were bonded onto the enamel or dentin surfaces—composite only, composite mixed with Composite Wetting Resin (CWR), composite mixed with Brush and Sculpt (BS), and composite mixed with Modeling Resin (MR). All groups were prepared by mixing at a 1:1 ratio by weight. Each specimen was subjected to the shear bond strength test. After the test, adhesive or cohesive failures were examined at the fractured sites. Data were analyzed using one-way and two-way analysis of variance (ANOVA) and the Tukey post hoc test. All composite groups mixed with CHAs displayed a reduced shear bond strength on dentin and enamel substrates compared to composite alone (p < 0.05). The shear bond strength on dentin decreased in the following order: CWR > BS > MR. A similar pattern was observed on enamel, except that there was no statistically significant difference between BS and MR. Statistically significant interactions between resin mixtures and substrates were found (p < 0.001). On the dentin substrate, adhesive failure dominated while adhesive/cohesive failure dominated on the enamel substrate. Conclusions: The shear bonding strength of composite decreases when mixed with CHAs on both dentin and enamel substrates.