Influence of pulse repetition rate of Er:YAG laser and dentin depth on tensile bond strength of dentin-resin interface.
The study evaluated the in vitro influence of pulse-repetition rate of Er:YAG laser and dentin depth on tensile bond strength of dentin-resin interface. Dentin surfaces of buccal or lingual surfaces from human third molars were submitted to tensile test in different depths (superficial, 1.0 and 1.5 mm) of the same dental area, using the same sample. Surface treatments were acid conditioning solely (control) and Er:YAG laser irradiation (80 mJ) followed by acid conditioning, with different pulse-repetition rates (1, 2, 3, or 4 Hz). Single bond/Z-250 system was used. The samples were stored in distilled water at 37 degrees C for 24 h, and then the first test (superficial dentine) was performed. The bond failures were analyzed. Following, the specimens were identified, grounded until 1.0- and 1.5-mm depths, submitted again to the treatments and to the second and, after that, to third-bond tests on a similar procedure and failure analysis. ANOVA and Tukey test demonstrated a significant difference (p < 0.001) for treatment and treatment x depth interaction (p < 0.05). The tested depths did not show influence (p > 0.05) on the bond strength of dentin-resin interface. It may be concluded that Er:YAG laser with 1, 2, 3, or 4 Hz combined with acid conditioning did not increase the resin tensile bond strength to dentin, regardless of dentin depth.
Gonçalves
Mariane
M
Ribeirão Preto School of Dentistry, University of São Paulo, São Paulo, Brazil. ane.gon@netsite.com.br
Corona
Silmara Aparecida Milori
SA
Palma-Dibb
Regina Guenka
RG
Pécora
Jesus Djalma
JD
D003188:Composite Resins; D001840:Dental Bonding / Q000592:standards*; D003804:Dentin; D017220:Dentin-Bonding Agents / Q000592:standards*; D019544:Equipment Failure Analysis; D006801:Humans; D007834:Lasers; D008422:Materials Testing; D008964:Molar, Third; D013718:Tensile Strength
D003188:Composite Resins; D017220:Dentin-Bonding Agents