Document Detail


In vitro analysis of femtosecond laser as an alternative to acid etching for achieving suitable bond strength of brackets to human enamel.
MedLine Citation:
PMID:  23483297     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
This study aims to evaluate the effect of laser irradiation and orthophosphoric acid etching on the shear bond strength (SBS) of orthodontic brackets to enamel. Three groups (n = 20) of extracted premolar teeth were randomly established depending on the laser treatment performed on the buccal surfaces: (1) no laser (control); (2) Er:YAG laser (2,940 nm, 0.8 W, 100 μs/pulse, 10 Hz) and; (3) Ti:Sapphire laser (795 nm, 1 W, 120 fs/pulse, 1 kHz). Each group was divided into two subgroups according to whether 37 %-orthophosphoric acid etching was made after laser irradiation or not. Brackets were randomly luted with Transbond(TM) XT adhesive resin. After 72 h, a SBS test was developed in a universal testing machine (crosshead speed, 0.5 mm/min). Representative specimens from each experimental subgroup were examined by means of scanning electron microscopy. Cement residuals remaining on the premolar surfaces were assessed using the adhesive remnant index. ANOVA, post-hoc tests for intergroup comparisons, chi-square test and linear regression were run for data analyses (α = 0.05). After acid etching, SBS values did not differ regardless the laser treatment. When phosphoric acid was not applied, the SBS values of the femtosecond laser group were significantly higher than for the other groups. Femtosecond laser without acid seems to be the most suitable method to improve bond strengths at the bracket/enamel interface, thus avoiding the disadvantages inherent to acid etching.
Authors:
M C Lorenzo; M Portillo; P Moreno; J Montero; R Castillo-Oyagüe; A García; A Albaladejo
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-3-13
Journal Detail:
Title:  Lasers in medical science     Volume:  -     ISSN:  1435-604X     ISO Abbreviation:  Lasers Med Sci     Publication Date:  2013 Mar 
Date Detail:
Created Date:  2013-3-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8611515     Medline TA:  Lasers Med Sci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Dental Clinic (Faculty of Medicine), University of Salamanca, Paseo Universidad de Coimbra, s/n, 37007, Salamanca, Spain, mcruzlorenzo@hotmail.com.
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