Environmental degradation of glass-ionomer cements: A depth-sensing microindentation study

Wang, X. Y., Yap, Adrian U. J., Ngo, H. C. and Chung, S. M. (2007) Environmental degradation of glass-ionomer cements: A depth-sensing microindentation study. Journal of Biomedical Materials Research Part B - Applied Biomaterials, 82B 1: 1-6. doi:10.1002/jbm.b.30697


Author Wang, X. Y.
Yap, Adrian U. J.
Ngo, H. C.
Chung, S. M.
Title Environmental degradation of glass-ionomer cements: A depth-sensing microindentation study
Journal name Journal of Biomedical Materials Research Part B - Applied Biomaterials   Check publisher's open access policy
ISSN 1552-4973
1552-4981
Publication date 2007-07-01
Sub-type Article (original research)
DOI 10.1002/jbm.b.30697
Volume 82B
Issue 1
Start page 1
End page 6
Total pages 6
Place of publication Hoboken, NJ, United States
Publisher John Wiley & Sons
Language eng
Formatted abstract
This study investigated the effects of various environmental conditions on the hardness and elastic modulus of restorative glass-ionomer cements (GICs). Two resin-modified GICs (RMGICs) (Fuji II LC [FL]; Photac-Fil Quick [PQ]) and three highly viscous GICs (HVGICs) (Fuji IX Fast [FN]; KetacMolar [KM]; KetacMolar Quick [KQ]) were evaluated in this study. Specimens were fabricated according to the manufacturers’ instructions and stored under a variety of conditions (n = 7): 100% humidity, distilled water, pH 5 demineralization solution, and pH 7 remineralization solution. The hardness and elastic modulus were measured using a depth-sensing microindentation test after 4 weeks. The results were analyzed using the independent samples T-test and ANOVA/Scheffe’s post hoc test (p < 0.05). HVGICs showed significantly higher hardness and elastic modulus than RMGICs under all storage conditions. Storage in distilled water significantly increased the hardness and elastic modulus of FN, but decreased that of PQ. All HVGICs and RMGICs stored in remineralization solution had hardness values and elastic moduli comparable to those stored in water. Compared to remineralization solution, demineralization solution had no significant effects on the modified GICs with the exception of KQ. The results suggest that the mechanical properties of glassionomer restoratives are material-type and storage condition dependent. Therefore, the clinical selection of a glass-ionomer material should be based on the oral environment to which it will be subjected.
Keyword Mechanical properties
Microindentation
Glass-ionomer
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Dentistry Publications
 
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Created: Thu, 18 Nov 2010, 00:18:11 EST