Strength of the bond as a predictor of marginal performance: an in vitro evaluation of contemporary adhesives.
OBJECTIVE
The aim of this study was to elucidate whether marginal performance (in terms of % of continuous margins) can, or not, be predicted from microTBS values. A relationship was attempted between microTBS and % of continuous margins (% CM) before and after loading of class V restorations made with five restorative systems from both etch & rinse and self-etch approach.


METHODS
Resin-dentin slabs and as well as class V cavities with cervical margins in dentin were prepared and restored using five adhesive systems (Scotchbond Multipurpose Plus (SMPP), James 2, Experimental Bond, Xeno III and iBond) with their corresponding restorative composites. Bond strength and percentages of continuous margins were calculated before and after thermal and mechanical loading. Statistical correlation was calculated between bond strength/marginal adaptation before loading and bond strength/marginal adaptation after loading of the same adhesives.


RESULTS
Ranking of materials according to their performance was test method dependent. A low weak correlation was found between bond strength and percentages of marginal adaptation.


CONCLUSIONS
No correlation could be established between strength of the bond and percentages of continuous margins. A direct comparison of bond strength with marginal adaptation data may be misleading.
Bortolotto
Tissiana
T
Division of Cariology and Endodontology, School of Dentistry, University of Geneva, 19, Rue Barthélemy-Menn, CH-1205, Geneva, Switzerland. Tissiana.Bortolotto@medecine.unige.ch
Mileo
Antonella
A
Krejci
Ivo
I
D000134:Acid Etching, Dental / Q000379:methods; D003188:Composite Resins; D001840:Dental Bonding; D003737:Dental Cavity Preparation; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000379:methods*; D003799:Dental Stress Analysis / Q000379:methods; D003804:Dentin; D017220:Dentin-Bonding Agents; D006801:Humans; D008422:Materials Testing / Q000379:methods; D019279:Resin Cements; D018709:Statistics, Nonparametric; D013718:Tensile Strength
D003188:Composite Resins; D017220:Dentin-Bonding Agents; D019279:Resin Cements