title: Base deflection and microleakage of composite restorations.
abstract: The flexural deflections of human dentin, Herculite XR, Dycal, Vidrion F, zinc phosphate base, and combinations of composite-base were determined. The influence of the flexural deflections in the marginal microleakage was also determined for the composite-base combinations. The flexural deflection test for dentin showed no statistically significant differences between the two floor cavity depths studied. There were significant differences among cements when the thickness of the base was 1 mm whereas no differences occurred at 2 mm. The composite-base combinations did not present statistical differences. There were no statistically significant differences in the microleakage levels among loaded and non-loaded specimens; however, dye penetration was visually greater in loaded samples.
authors.affiliation: UNICAMP, School of Dentistry, Campinas State University, Piracicaba, São Paulo, Brazil.
authors.forename: L A
authors.initials: LA
authors.lastname: Paulillo
authors.forename: M F
authors.initials: MF
authors.lastname: de Goes
authors.forename: S
authors.initials: S
authors.lastname: Consani
mesh_terms: D002126:Calcium Hydroxide / Q000737:chemistry; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003188:Composite Resins / Q000737:chemistry*; D003736:Dental Cavity Lining; D003763:Dental Leakage; D018772:Dental Marginal Adaptation; D003804:Dentin / Q000737:chemistry*; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008903:Minerals / Q000737:chemistry; D018583:Pliability; D019279:Resin Cements; D015036:Zinc Phosphate Cement / Q000737:chemistry
chemical_list: D003188:Composite Resins; D005899:Glass Ionomer Cements; D008903:Minerals; D019279:Resin Cements; C090880:Vidrion F; C065770:Herculite XR; C025702:Dycal; D015036:Zinc Phosphate Cement; D002126:Calcium Hydroxide