Work

Bonding neat hydrophobic-rich resins to etched dentin: A proof of concept

Year: 2024

Type: article

Abstract: To examine whether the effectiveness of current dentin-priming approaches requiring solvated hydrophilic resins may be replicated by modifying the infiltration dynamics of neat methacrylate-based monomers into dry-etched dentin using dimethyl sulfoxide (DMSO) pretreatments. Methods: H 3 PO 4 -etched mid-coronal dentin surfaces from human molars were air-dried for 30 s and randomly pretreated with 50 %(v/v) ethanolic DMSO for 20 or 60 s. Untreated samples and an isolated wet-bonding group served as controls. Samples were bonded with a three-step etch-and-rinse adhesive or simply with the solvent-free hydrophobic-rich resin. Restored crown segments (n = 7/group) were stored in distilled water for 24 h and sectioned for microtensile bond strength testing. Resin-dentin beams (0.8 mm 2 ) were tested under tension until failure (0.5 mm/min) after 24 h or 2 years of storage in artificial saliva at 37 °C. Nanoleakage evaluation and hybrid layer characterization were performed by SEM. Bond strength data was examined by three-way ANOVA followed by Tukey and Dunnett’s test (α = 0.05). Results: Pretreatments significantly affected the ability of neat and solvated resins to bond to etched-dry dentin ( p = 0.001). Ageing significantly lowered bond strengths depending on resin composition and DMSO-application times ( p = 0.007). While hybridization of DMSO-treated dentin with the solvated resin produced no significant reductions in bond strengths after ageing ( p < 0.05) improving hybrid layer integrity, direct bonding of the neat hydrophobic-rich resin matched the long-term bonding performance of the “gold standard” wet-bonding protocol ( p > 0.05). Significance : Lowering dentin’s hydration state via DMSO-dry bonding allows direct coupling of neat methacrylate-based resins, which may contribute to developing new strategies to ultimately extend the durability of resin-dentin interfaces.

Source: Dental Materials

DOI: 10.1016/j.dental.2024.10.018

Authors: Thiago Henrique Scarabello Stape, Omar Abdelaziz Ismail, Marcelo Capitanio, Arzu Tezvergil-Mutluay

Institutions: University of Turku, Turku University Hospital, Cairo University, Horus University – Egypt

Language: English

Topic: Dental materials and restorations

Subfield: Orthodontics

Field: Dentistry

Domain: Health Sciences

Open Access status: hybrid

Estimated APC paid: $4,170

Funder: Turun Yliopistollinen Keskussairaala