Wear characteristics and inhibition of enamel demineralization by resin-based coating materials.
In this study, wear and inhibition of enamel demineralization by resin-based coating materials were investigated. Seven commercially available coating materials, with and without fillers, were used. A mechanical wear test was performed, and the specimens were then examined with a scanning electron microscope. Hardness and elastic modulus measurements for each material were obtained by nanoindentation testing. Thin layers of each material were applied on human enamel surfaces, which were subjected to alternating immersion in demineralizing and remineralizing solutions. The inhibition ability of enamel demineralization adjacent to the coating was estimated with depth-dependent mechanical properties using the nanoindentation test. The non-filled coating material showed significantly lower hardness, lower elastic modulus, and higher weight loss. There were no significant differences in weight loss among the six filled coating materials. After the alternating immersion protocol, the enamel specimens having application of coating materials with ion-releasing ability were harder than those in the other groups in some locations 1-11 μm from the enamel surface and within 300 μm from the edge of the coating materials. In conclusion, clinical use of the resin-based coating materials with ion-releasing ability may prevent demineralization of exposed enamel adjacent to the coating during treatment.
Division of Orthodontics and Dentofacial Orthopedics, Department of Oral Growth and Development, School of Dentistry, Health Sciences University of Hokkaido, Hokkaido, Japan.
Naohiko
N
Kawamura
Division of Orthodontics and Dentofacial Orthopedics, Department of Oral Growth and Development, School of Dentistry, Health Sciences University of Hokkaido, Hokkaido, Japan.
Masahiro
M
Iijima
Division of Cariology and Endodontology, Department of Oral Rehabilitation, Health Sciences University of Hokkaido, Hokkaido, Japan.
Shuich
S
Ito
Division of Restorative Science and Prosthodontics, College of Dentistry, The Ohio State University, Columbus, Ohio, USA.
William A
WA
Brantley
Department of Endodontics, College of Dentistry, University of Illinois, Chicago, Illinois, USA.
Satish B
SB
Alapati
Division of Orthodontics and Dentofacial Orthopedics, Department of Oral Growth and Development, School of Dentistry, Health Sciences University of Hokkaido, Hokkaido, Japan.
Takeshi
T
Muguruma
Division of Orthodontics and Dentofacial Orthopedics, Department of Oral Growth and Development, School of Dentistry, Health Sciences University of Hokkaido, Hokkaido, Japan.
Kyotaro
K
Kawaguchi
Division of Cariology and Endodontology, Department of Oral Rehabilitation, Health Sciences University of Hokkaido, Hokkaido, Japan.
Takashi
T
Saito
Division of Orthodontics and Dentofacial Orthopedics, Department of Oral Growth and Development, School of Dentistry, Health Sciences University of Hokkaido, Hokkaido, Japan.
Itaru
I
Mizoguchi
D001641:Bicuspid; D003743:Dental Enamel / Q000187:drug effects*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D055119:Elastic Modulus; D006244:Hardness; D006801:Humans; D066298:In Vitro Techniques; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D019279:Resin Cements / Q000737:chemistry*; D017001:Tooth Demineralization / Q000517:prevention & control*
D017220:Dentin-Bonding Agents; D019279:Resin Cements
enamel coating; enamel demineralization buffering; nanoindentation; wear