Influence of environmental calcium/phosphate and pH on glass ionomers

Wang, Xiao Yan, Jin, Adrian Yap U. and Ngo, Hien C. (2007) Influence of environmental calcium/phosphate and pH on glass ionomers. European Journal of Oral Sciences, 115 3: 224-229. doi:10.1111/j.1600-0722.2007.00443.x


Author Wang, Xiao Yan
Jin, Adrian Yap U.
Ngo, Hien C.
Title Influence of environmental calcium/phosphate and pH on glass ionomers
Journal name European Journal of Oral Sciences   Check publisher's open access policy
ISSN 0909-8836
1600-0722
Publication date 2007-06-01
Sub-type Article (original research)
DOI 10.1111/j.1600-0722.2007.00443.x
Volume 115
Issue 3
Start page 224
End page 229
Total pages 6
Place of publication Malden, MA, United States
Publisher Wiley-Blackwell Publishing
Language eng
Abstract This study investigated the effects of environmental calcium/phosphate and pH on the hardness and elastic modulus of two glass-ionomer cements (GICs) [Fuji IX Fast (FN) and KetacMolar (KM)]. Specimens were randomly subjected to storage media of pH 3, 5, and 7. The calcium and phosphate levels of the storage solutions ranged from 0 to 2.4 mM. After 4 wk of conditioning, hardness and elastic modulus were determined using a depth-sensing microindentation test. Sectioned surfaces were observed with scanning electron microscopy. For both FN and KM, no significant change in hardness, elastic modulus, or surface structure were observed at pH 7 and 5, regardless of the concentration of calcium and phosphate. FN and KM specimens conditioned at pH 3 had lower hardness and modulus in comparison to those conditioned at pH 7. An increased level of environmental phosphate led to higher hardness and elastic modulus of FN and KM at pH 3. In general, a microscopic surface reaction layer was observed in specimens conditioned at pH 3. The thickness and structure of the reaction layer varied depending on environmental phosphate levels. The results suggest that the influence of environmental calcium and phosphate on GICs was pH dependent.
Keyword Calcium phosphate
Glass ionomer
Mechanical properties
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, 00:18:01 EST