Tensile and shear bond strength evaluation of a total-etch three-step and two self-etching one-step dentin bonding systems.
OBJECTIVE
The aim of this study was to compare the bond strengths of two new self-etching one-step (Prompt L-Pop 2 and Adper Prompt L-pop) to a total-etch three-step dentin bonding system (Scotchbond Multipurpose Plus).


METHODS
One hundred twenty human molars were randomly divided into 3 groups of 40 specimens each. Dentin surfaces of each group were bonded with either Scotchbond Multipurpose Plus (SMP), a three-step system, Prompt L-Pop 2 (PLP), or Adper Prompt L-Pop (APLP), two one-step bonding systems--according to manufacturers' recommendations. After adhesive application, a composite resin cylinder was incrementally built in a Teflon mold (5 mm high and 5 mm in diameter). The samples of each group were randomly divided into 2 subgroups of 20 samples each and were tested in a shear bond or in a tensile bond strength mode (crosshead speed 5 mm/min). Statistical analyses were performed with one-way ANOVA and Student's t-test.


RESULTS
The significantly lowest shear and tensile bond strength values were obtained with APLP. PLP revealed higher shear bond strengths than APLP and SMP. There were no differences in tensile bond strengths between PLP and SMP (p < 0.05).


CONCLUSIONS
The results of this in vitro study showed that the chemical modifications (adjunction of monomers and copolymers) of the self-etching all-in-one system APLP did not improve its mechanical properties.
Maurin
Jean-Christophe
JC
Development and Regeneration of Dental Tissues Laboratory, Faculty of Odontology, University of Lyon, France.
Lagneau
Christelle
C
Durand
Magali
M
Lissac
Michèle
M
Seux
Dominique
D
D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing / Q000379:methods; D010755:Organophosphates / Q000737:chemistry*; D019279:Resin Cements / Q000737:chemistry*; D033081:Shear Strength; D013718:Tensile Strength
C489661:Adper Prompt Self-Etch; D017220:Dentin-Bonding Agents; D010755:Organophosphates; C408584:Prompt L-Pop; D019279:Resin Cements; C425844:Scotchbond Multi-Purpose Plus; D017438:Bisphenol A-Glycidyl Methacrylate