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Changes in Resin-infiltrated Dentin Stiffness after Water Storage

¹ Faculty of Dentistry, Srinakharinwirot University, Thailand;
² Guanghua School of Stomatology & Institute of Stomatological Research, Sun Yatsen University, Guangzhou, China;
³ Department of Oral Biology and
⁵ Department of Oral Rehabilitation, School of Dentistry, Medical College of Georgia, Augusta, GA 30912-1129, USA;
⁴ Pediatric Dentistry and Orthodontics, University of Hong Kong, Hong Kong SAR, China;
⁶ Department of Operative Dentistry, Faculty of Dentistry, Mahidol University, Thailand; and
⁷ Department of Mechanical Engineering, University of Maryland Baltimore County, Baltimore, MD, USA

Correspondence: ^* corresponding author, ftay{at}mail.mcg.edu

Plasticization of polymers by water sorption lowers their mechanical properties in a manner that is predictable by the polarity of their component resins. This study tested the hypothesis that when adhesive resins were used to create resin-infiltrated dentin, the reductions in their flexural moduli after water storage would be lowered proportional to their hydrophilic characteristics. Three increasingly hydrophilic resin blends were used to fabricate polymer beams and macro-hybrid layer models of resin-infiltrated dentin for testing with a miniature three-point flexure device, before and after 1–4 weeks of water storage. Flexural modulus reductions in macro-hybrid layers were related to, and more extensive than, reductions in the corresponding polymer beams. Macro-hybrid layers that were more hydrophilic exhibited higher percent reductions in flexural modulus, with the rate of reduction proportional to the Hoy’s solubility parameters for total intermolecular attraction forces (_t) and polar forces (_p) of the macro-hybrid layers.

Key Words: water • hydrophilicity • solubility parameter • macro-hybrid layer • flexural modulus

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