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Tensile bond strength of a flowable composite resin to ER:YAG‐laser‐treated dentin
Author(s) -
DonadioMoura Juliana,
GouwSoares Sheila,
de Freitas Patricia M.,
Navarro Ricardo S.,
Powell Lynn G.,
Eduardo Carlos de P.
Publication year - 2005
Publication title -
lasers in surgery and medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 112
eISSN - 1096-9101
pISSN - 0196-8092
DOI - 10.1002/lsm.20176
Subject(s) - dentin , bond strength , ultimate tensile strength , molar , composite number , materials science , phosphoric acid , composite material , adhesive , universal testing machine , distilled water , er:yag laser , laser , dentistry , chemistry , optics , medicine , physics , layer (electronics) , chromatography , metallurgy
Background and Objectives This in vitro study evaluated the influence of a flowable composite resin (FCR) on the tensile bond strength of resin to dentin treated with the Er:YAG Laser (L) and diamond bur (DB). Study Design/Materials and Methods Ninety dentin surfaces obtained from 45 third molars were ground and randomly divided into six groups ( n = 15): G1–DB, G2–DB+FCR, G3–L (100 mJ, 10 Hz, 37.04 J/cm 2 ), G4–L (100 mJ, 10 Hz, 37.04 J/cm 2 )+FCR, G5–L (250 mJ, 2 Hz, 92.60 J/cm 2 ), and G6–L (250 mJ, 2 Hz, 92.60 J/cm 2 )+FCR. After surface etching with 37% phosphoric acid and the application of an adhesive system, inverted conical specimens were prepared with a hybrid composite resin. In groups G2, G4, and G6 a FCR was placed before the hybrid composite resin. After 24 hours‐storage in distilled water, the tensile test was performed in a universal testing machine (0.5 mm/minute, 500 N). Results Data were submitted to Kruskal Wallis test ( P = 0.01). The mean bond strength values (MPa±SD) were: G1–13.54 (±2.99), G2–14.67 (±2.32), G3–9.49 (±3.09), G4–14.60 (±2.76), G5–8.97 (±3.89), and G6–13.02 (±2.18). Groups G1 and G2 presented the highest bond strength values, which were statistically similar to those of G4 and G6. The groups treated with laser and without the FCR (G3 and G5) showed the lowest shear bond strength values. Conclusions FCR can increase the adhesion to dentin treated with Er:YAG laser within different parameters. © 2005 Wiley‐Liss, Inc.