Journal of Oral Tissue Engineering

ORIGINAL ARTICLE
 Mineralization of Resin Using Experimental Adhesives Containing Hydroxyapatite in Long Term

 Tomohiro HOSHIKA1, Yoshihiro NISHITANI2, Kei TAKAHASHI1, Haruka OGATA2, Naoko OHARA3, Takehiro KAJIHARA2, Masahiro YOSHIYAMA3

1Department of Operative Dentistry, Okayama University Hospital, Okayama, Japan
2Department of Restrative Dentistry and Endodontology,
Research Field in Dentistry, Medical and Dental Sciences Area,
Research and Education Assembly, Kagoshima University, Kagoshima, Japan
3Department of Operative Dentistry, Okayama University
Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
J Oral Tissue Engin 2015; 13(2): 85-95
SYNOPSIS
Incomplete resin infiltration into acid-etched dentin leaves water-rich, resin-poor regions in hybrid layers that may cause degradation of resins and collagen fibrils. Incorporation of hydroxyapatite (HAp) into resins may provide a reservoir of calcium phosphate that might “backfill” water-filled voids in hybrid layers and resins. The purpose of this study was to test the hypothesis that incorporation of HAp into experimental resins can fill in microvoids with calcium phosphate. Three experimental adhesives were created by adding 0, 5 or 10wt% HAp. We carried out the following experiments: Water sorption and solubility evaluation, Evaluation of the calcium deposition inducibility, SEM observation and energy dispersive X-ray analysis, Tensile Testing. Although hydroxyapatite appears to have no effect on the ability of resin to infiltrate dentin in this study, incorporating HAp into dental adhesives may allow the formation of crystals below the hybrid layer, which could help create a stronger anchor.

Key words: adhesive, dentin, hydroxyapatite


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