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.
Division of Cariology and Endodontics, School of Dentistry, University of Geneva, Rue Barthelemy Menn, 19, CH-1205 Geneva, Switzerland. Tissiana.Bortolotto@unige.ch
Tissiana
T
Bortolotto
Wassila
W
Doudou
Karl Heinz
KH
Kunzelmann
Ivo
I
Krejci
D000134:Acid Etching, Dental / Q000379:methods; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D003737:Dental Cavity Preparation / Q000145:classification; D003743:Dental Enamel / Q000648:ultrastructure*; D018772:Dental Marginal Adaptation; D003764:Dental Materials / Q000737:chemistry*; D003793:Dental Restoration, Permanent / Q000145:classification*; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D058105:Polymerization; D019279:Resin Cements / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013997:Time Factors; D014867:Water / Q000737:chemistry
C112828:Clearfil AP-X; D003188:Composite Resins; D003764:Dental Materials; D017220:Dentin-Bonding Agents; C474035:Filtek Supreme; C498353:G-Bond; D008689:Methacrylates; C469607:OptiBond FL; C451600:OptiBond Solo Plus; C408584:Prompt L-Pop; D019279:Resin Cements; C403634:Stae bonding agent; C407402:Unifil Bond; C477386:iBond; D014867:Water; C074811:Tenure adhesive; C041330:Scotchbond