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Influence of pulse repetition rate of Er:YAG laser and dentin depth on tensile bond strength of dentin–resin interface
Author(s) -
Gonçalves Mariane,
Corona Silmara Aparecida Milori,
PalmaDibb Regina Guenka,
Pécora Jesus Djalma
Publication year - 2008
Publication title -
journal of biomedical materials research part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.849
H-Index - 150
eISSN - 1552-4965
pISSN - 1549-3296
DOI - 10.1002/jbm.a.31636
Subject(s) - dentin , materials science , bond strength , ultimate tensile strength , molar , distilled water , er:yag laser , laser , composite material , universal testing machine , dental bonding , dentistry , optics , adhesive , chemistry , medicine , physics , layer (electronics) , chromatography
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°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 × 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. © 2007 Wiley Periodicals, Inc. J Biomed Mater Res, 2008