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ID 32946
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Author
Nishgawa, Goro
Suzuki, Kazuomi
Watts, David C
Abstract

This in vitro study evaluated the effects of delayed versus immediate polishing to permit maturation of interfacial gap-formation around highly viscous conventional glass-ionomer cement (HV-GIC) in Class I restorations, together with determining the associated mechanical properties. Cavity preparations were made on the occlusal surfaces of premolars. Three HV-GICs (Fuji IX GP, GlasIonomer FX-II and Ketac Molar) and one conventional glass-ionomer cement (C-GIC, Fuji II, as a control) were studied, with specimen subgroups (n=10) for each property measured. After polishing, either immediately (six minutes) after setting or after 24 hours storage, the restored teeth were sectioned in a mesiodistal direction through the center of the model Class I restorations. The presence or absence of interfacial-gaps was measured at 1000× magnification at 14 points (each 0.5-mm apart) along the cavity restoration interface (n=10; total points measured per group = 140). Marginal gaps were similarly measured in Teflon molds as swelling data, together with shear-bond-strength to enamel and dentin, flexural strength and moduli. For three HV-GICs and one C-GIC, significant differences (p<0.05) in gap-incidence were observed between polishing immediately and after one-day storage. In the former case, 80–100 gaps were found. In the latter case, only 9–21 gaps were observed. For all materials, their shear-bond-strengths, flexural strength and moduli increased significantly after 24-hour storage.

Note
Published with permission from the copyright holder.
This is the author's copy, as published in Operative Dentistry, September 2008, Volume 33, Issue 2, Pages 196-202.
Publisher URL:http://dx.doi.org/10.2341/07-75
Copyright © 2008 Operative Dentistry, Inc
Published Date
2008-9
Publication Title
Operative Dentistry
Volume
volume33
Issue
issue2
Start Page
196
End Page
202
Content Type
Journal Article
language
English
Refereed
True
DOI
Submission Path
dentistry_general/11