52383
document
The competition between enamel and dentin adhesion within a cavity : an in vitro evaluation of class V restorations . To gain more insight into the consequences of curing contraction within the tooth cavity , we assessed the margin behavior of 12 contemporary restorative systems in class V restorations with margins located on enamel and dentin after mechanical loading and water storage . Mixed class V cavities were prepared on extracted human molars and restored using five etch and rinse and seven self-etch adhesive systems with their corresponding composites . Marginal adaptation was evaluated by using a computer-assisted quantitative marginal analysis in a scanning electron microscope ( SEM ) on epoxy replicas before , after thermal and mechanical stressing and after 1 year of water storage . The interactions of " testing conditions " , " adhesive-composite combination " and " tooth substrate " with " marginal adaptation " were evaluated by two-way ANOVA . Fatigue , stress and storage conditions had significant effects on the marginal adaptation . Only two groups ( Optibond FL and G Bond ) presented equal percentages of marginal adaptation on enamel and dentin ; in the other groups , the rate of degradation was product dependent . All materials tested showed a distinct behavior on enamel and dentin . In addition to mechanical resistance and long-term stability , differences within materials also exist in their ability to simultaneously bond to enamel and dentin .
52384
Intervention_Physical
five etch and rinse
52385
Intervention_Physical
seven self-etch adhesive systems
52386
Intervention_Physical
scanning electron microscope
52387
Outcome_Other
Fatigue , stress and storage conditions
52388
Outcome_Other
marginal adaptation .
52389
Outcome_Physical
marginal adaptation on enamel
52390
Outcome_Other
and
52391
Outcome_Physical
dentin
52392
Outcome_Other
;
52393
Outcome_Physical
rate of degradation
52394
Outcome_Physical
enamel
52395
Outcome_Physical
dentin
52396
Outcome_Other
simultaneously bond to enamel and dentin .