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Bond strength to dentin of primary teeth irradiated with varying Er:YAG laser energies and SEM examination of the surface morphology
Author(s) -
Monghini Elisângela M.,
Wanderley Rosimeyri L.,
Pécora Jesus D.,
Palma Dibb Regina G.,
Corona Silmara A.M.,
Borsatto Maria C.
Publication year - 2004
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.20023
Subject(s) - morphology (biology) , dentin , irradiation , bond strength , materials science , laser , composite material , primary (astronomy) , dentistry , scanning electron microscope , optics , medicine , adhesive , physics , geology , layer (electronics) , nuclear physics , paleontology , astronomy
Background and Objectives This study aimed to assess in vitro the influence of Er:YAG laser energy on the shear bond strength of a total‐etch adhesive to lased dentin of primary teeth, and observe under SEM the morphological appearance of laser‐ablated dentin surfaces. Study Design/Materials and Methods For SBS, specimens were irradiated with the energies 60 mJ/2 Hz (G2), 80 mJ/2 Hz (G3), 100 mJ/2 Hz (G4). Control (G1) was not irradiated. Dentin surfaces were acid‐etched, Single Bond ® adhesive (3 M) was applied, and resin cylinders were fabricated from Z250 ® resin (3 M). Bond strength was tested in shear (0.5 mm/min). For morphological analysis, specimens were irradiated using the same energies, either or not acid‐etched, and observed by SEM. Results and Conclusions SBS means, in MPa, were: G1‐17.89(±4.75); G2‐12.34(±4.85); G3‐10.30(±3.67); G4‐10.41(±4.20). Overall, Er:YAG laser irradiation of primary teeth dentin, prior to the adhesive protocol, adversely affected bond strength. Furthermore, it was noticed that even though there was no significant difference among the Er:YAG laser‐treated groups, the increase of laser energy resulted in increasingly cratered surfaces, regardless of acid‐etching association. Lasers Surg. Med. 34:254–259, 2004. © 2004 Wiley‐Liss, Inc.