Bond Strength of a Universal Adhesive System to Class I Lateral Walls

Objectives: The aim of this study was to evaluate the bond strength of a universal adhesive system applied with the total etch technique at the lateral walls of Class I cavities,
Methods: Class I cavities (4.5mm X 3mm X 5mm) were performed in 30 sound extracted human molars (obtained under a protocol aproved by the Ethics Committee of the Bauru School of Denistry # 336.886) and restored with Adper Single Bond Universal - 3M/ESPE (group SBU) or Scotchbond Multipurpose - 3M ESPE (group SMP) adhesives systems and Filtek Z250 (3M ESPE) inserted incrementaly, After 24 hours storage in deionized water at 37ºC, the teeth were sectioned into ≈0.8mm sticks obtained from the lateral walls of the cavities. The specimens obtained were submitted to a tensile force in a Universal Testing Machine Instron at a 0.5mm/ min speed.

Results: Data (MPa) analyzed by t-test with a significance level of 5% were SBU (n=15): 24.09 ± 7.63 and SMP (n=15): 31.42 ± 10.59.
Conclusions: Single Bond Universal used as a total etch adhesive showed no difference in bond strength to dentin of lateral walls of Class I cavities compared to Scotchbond Multi Purpose.