title: 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.affiliation: Department of Cariology, Endodontology and Pediatric Dentistry, School of Dentistry, University of Geneva, Geneva, Switzerland. didier.dietschi@medecine.unige.ch
authors.forename: Didier
authors.initials: D
authors.lastname: Dietschi
authors.forename: Steven
authors.initials: S
authors.lastname: Olsburgh
authors.forename: Ivo
authors.initials: I
authors.lastname: Krejci
authors.forename: Carel
authors.initials: C
authors.lastname: Davidson
mesh_terms: D020770:Compomers; D003188:Composite Resins; D003736:Dental Cavity Lining; D018772:Dental Marginal Adaptation; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents; D006801:Humans; D007284:Inlays; D008422:Materials Testing; D008689:Methacrylates; D008855:Microscopy, Electron, Scanning; D008963:Molar; D011897:Random Allocation; D017640:Silicates; D016474:Weight-Bearing
chemical_list: D020770:Compomers; D003188:Composite Resins; D017220:Dentin-Bonding Agents; C088486:Dyract; D008689:Methacrylates; C099128:Prodigy; C102735:Revolution (composite resin); D017640:Silicates; C452226:tetric flow composite resin