title: The influence of resin composite and bonded amalgam restorations on dentine permeability in Class II cavities in vitro.
abstract: OBJECTIVE
  This study was conducted to measure and compare dentine permeability reduction in Class II preparations, after restoration with resin composite or bonded amalgam, using either a multi-step or one-bottle dental adhesive system.
  
  
  METHODS
  An in vitro fluid transport model was used to measure initial dentine permeability in Class II cavities with an intact smear layer in crown segments from extracted human premolars. One week and 3 months after restoration with resin composite or bonded amalgam, using either multi-step or one-bottle dental adhesive system, the measurements were repeated and the reduction in permeability was calculated as a percentage of the initial values. The data were analyzed statistically using a one-way ANOVA and Least Significant Difference tests.
  
  
  RESULTS
  After 1 week the resin composite with one-bottle dental adhesive system provided the highest reduction in dentine permeability, whereas after 3 months the bonded amalgam caused the highest reduction. At both time intervals the resin composite with multi-step adhesive system provided the lowest reduction. (P=0.036 at 1 week, P=0.016 at 3 months). After 3-months storage in water a significant increase in dentine permeability reduction was found in the bonded amalgam group only (P=0.017). The reduction in dentine permeability provided by resin composite with one-bottle dental adhesive system and bonded amalgam in Class II cavities was similar at both time intervals. (P=0.182 at 1 week, P=0.750 at 3 months).
  
  
  CONCLUSIONS
  The results of this study indicated that on the basis of reducing dentine permeability in vitro, resin composite restorations with the investigated one-bottle adhesive system was superior to its multi-step equivalent and bonded amalgam can also be preferred in Class II restorations.
authors.affiliation: Department of Cariology, Endodontology, Pedodontology, Academic Center for Dentistry Amsterdam (ACTA), Louwesweg 1, 1066 EA, Amsterdam, Netherlands. r.ozok@acta.nl
authors.forename: A R
authors.initials: AR
authors.lastname: Ozok
authors.forename: A J
authors.initials: AJ
authors.lastname: De Gee
authors.forename: M K
authors.initials: MK
authors.lastname: Wu
authors.forename: P R
authors.initials: PR
authors.lastname: Wesselink
mesh_terms: D000293:Adolescent; D000704:Analysis of Variance; D001641:Bicuspid; D003188:Composite Resins / Q000494:pharmacology*; D003723:Dental Amalgam / Q000494:pharmacology*; D003737:Dental Cavity Preparation; D003763:Dental Leakage / Q000517:prevention & control; D003793:Dental Restoration, Permanent / Q000379:methods; D003806:Dentin Permeability / Q000187:drug effects*; D017220:Dentin-Bonding Agents / Q000494:pharmacology; D019234:Dentinal Fluid / Q000502:physiology; D006801:Humans; D019279:Resin Cements / Q000494:pharmacology; D012212:Rheology; D019228:Tooth Crown / Q000502:physiology
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; D019279:Resin Cements; C084018:Scotchbond Multi-Purpose; D003723:Dental Amalgam