In vitro evaluation of marginal and internal adaptation after occlusal stressing of indirect class II composite restorations with different resinous bases.

Abstract	Composite inlays are indicated for large cavities, which frequently extend cervically into dentin. The purpose of this study was to compare in vitro the marginal and internal adaptation of class II fine hybrid composite inlays (Herculite, Kerr) made with or without composite bases, having different physical properties. Freshly extracted human molars were used for this study. The base extended up to the cervical margins on both sides and was made from Revolution (Kerr), Tetric flow (Vivadent), Dyract (Detrey-Dentsply) or Prodigy (Kerr), respectively. Before, during and after mechanical loading (1 million cycles, with a force varying from 50 to 100 N), the proximal margins of the inlay were assessed by scanning electron microscopy. Experimental data were analysed using non-parametric tests. The final percentages of marginal tooth fracture varied from 30.7% (no base) to 37.6% (Dyract). In dentin, percentages of marginal opening varied from 9.2% (Tetric Flow) to 30.1% (Prodigy), however, without significant difference between base products. Mean values of opened internal interface with dentin varied from 11.06% (Tetric Flow) to 28.15% (Prodigy). The present results regarding dentin adaptation confirmed that the physical properties of a base can influence composite inlay adaptation and that the medium-rigid flowable composite Tetric Flow is a potential material to displace, in a coronal position, proximal margins underneath composite inlays.
Authors	Didier Dietschi, Steven Olsburgh, Ivo Krejci, Carel Davidson
Journal	European journal of oral sciences (Eur J Oral Sci) Vol. 111 Issue 1 Pg. 73-80 (Feb 2003) ISSN: 0909-8836 [Print] England
PMID	12558811 (Publication Type: Comparative Study, Evaluation Study, Journal Article)
Chemical References	Compomers Composite Resins Dentin-Bonding Agents Dyract Methacrylates Prodigy Revolution (composite resin) Silicates tetric flow composite resin
Topics	Compomers Composite Resins Dental Cavity Lining Dental Marginal Adaptation Dental Stress Analysis Dentin-Bonding Agents Humans Inlays Materials Testing Methacrylates Microscopy, Electron, Scanning Molar Random Allocation Silicates Weight-Bearing

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