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ID 32950
フルテキストURL
著者
Irie, Masao Okayama University
Hatanaka, Kenji Okayama Univeristy
Suzuki, Kazuomi Okayama University
Watts, David C. University of Manchester
抄録

Objectives
The aims of this investigation were to clarify the effects of 24 h water-storage and finishing time on mechanical properties and marginal adaptation to a Class V cavity of eight modern flowable resin-composites.

Methods
Eight flowable composites, plus two controls (one microfilled and one hybrid composite), were investigated with specimen sub-groups (n = 10) for each property measured. The principal series of experiments was conducted in model Class V cavities with interfacial polishing either immediately (3 min) after setting or after 24 h water-storage. After the finishing procedure, each tooth was sectioned in a buccolingual direction through the center of the restoration, and the presence or absence of marginal-gaps was measured (and then summed for each cavity) at 14 points (each 0.5 mm apart) along the cavity restoration interface (n = 10 per group; total points measured = 140). The shear bond-strengths to enamel and to dentin, and flexural strengths and moduli data were also measured at 3 min and after 24 h water-storage.

Results
For all flowable composites, polished immediately after setting, 14–30 summed gaps were observed (controls: 64 and 42). For specimens polished after 24 h, a significantly (p < 0.05) reduced number of 8–17 summed gaps occurred for only 3 flowable composites; whereas for 5 flowable composites there were non-significantly-different (p > 0.05) numbers (11–17) of summed gaps (controls: 28 and 22). After 24 h storage, shear bond-strengths to enamel and to dentin, flexural strengths and moduli increased highly significantly (p < 0.001) for all materials, except Silux Plus.

Significance
A post-cure interval of 24 h resulted in enhanced mechanical and adhesive properties of flowable dental composites. In a minority of cases there was also a reduced incidence of marginal-gap formation. However the latter effect may be partly attributed to 24 h delayed polishing, even though such a delay is not usual clinical practice.

キーワード
Flowable composite
Gap-formation
Class V restoration
Flexural
Bond-strength
備考
Digital Object Identifier: 10.1016/j.dental.2006.06.001
Published with permission from the copyright holder. This is the author's copy, as published in Dental Material, September 2006, Volume 22, Issue 9, Pages 875-883.
Publisher URL:http://dx.doi.org/10.1016/j.dental.2006.06.001
Direct access to Thomson Web of Science record
Copyright © 2006 Academy of Dental Materials Published by Elsevier Ltd. All rights reserved.
発行日
2006-9
出版物タイトル
Dental Material
22巻
9号
開始ページ
875
終了ページ
883
資料タイプ
学術雑誌論文
言語
English
査読
有り
DOI
Web of Science KeyUT
Submission Path
dentistry_general/4