Document Detail

Bleaching effects on shear bond strengths of orthodontic brackets.
MedLine Citation:
PMID:  22583584     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: The purpose of this research was to investigate the influence of 35% hydrogen peroxide on orthodontic bracket adhesion at zero hour, 24 hours, 7, 21 and 56 days after dental bleaching.
MATERIALS AND METHODS: Ninety bovine incisors were prepared for adhesion test and adhesive remnant index (ARI) determination. The 35% hydrogen peroxide was used as a bleaching agent and the Transbond XT as a bonding agent.
RESULTS: Statiscally significant differences were observed between all the groups (p<0.001) and were observed in the comparison of zero hour and control group (p<0.001) and in the comparison of zero hour and 24 hours (p<0.001). ARI scores (0, 1, 2 e 3) also showed statiscally differences between all the groups (p=0.011) and at the comparison of all the test groups with the control: zero hour (p=0.001), 24 hours (p=0.009), 7 days (p=0.018), 21 days (p<0.001) e 56 days (p=0.004).
CONCLUSIONS: The shear bond strength values became significantly lower when the bracket was bonded immediately after bleaching and quickly returned to control level in 24 hours. In seven days, there was a slight increase that was not significant and recovered to normal values in the next weeks. Different patterns of fractures were observed in bleached enamel when ARI scores were analyzed. The control group showed a high frequency of 3 score and none of zero score, the opposite behavior was observed in the test groups.
Mariana M Martins; Marco A de Oliveira Almeida; Carlos N Elias; Alvaro de Moraes Mendes
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Publication Detail:
Type:  Comparative Study; Journal Article     Date:  2011-09-01
Journal Detail:
Title:  Progress in orthodontics     Volume:  13     ISSN:  2196-1042     ISO Abbreviation:  Prog Orthod     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-05-15     Completed Date:  2012-10-24     Revised Date:  2013-06-18    
Medline Journal Info:
Nlm Unique ID:  100936353     Medline TA:  Prog Orthod     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  23-9     Citation Subset:  D; IM    
Copyright Information:
Copyright © 2011 Società Italiana di Ortodonzia SIDO. Published by Elsevier Srl. All rights reserved.
Department of Orthodontics, Faculty of Dentistry, University of Rio de Janeiro State, Brazil.
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MeSH Terms
Acid Etching, Dental / methods
Carbon Compounds, Inorganic / chemistry
Dental Bonding / methods*
Dental Enamel / anatomy & histology
Dental Prophylaxis / methods
Dental Stress Analysis / instrumentation
Hydrogen Peroxide / chemistry
Materials Testing
Orthodontic Brackets*
Phosphoric Acids / chemistry
Resin Cements / chemistry*
Saliva, Artificial / chemistry
Shear Strength
Silicon Compounds / chemistry
Stress, Mechanical
Surface Properties
Time Factors
Tooth Bleaching / methods*
Tooth Bleaching Agents / chemistry*
Reg. No./Substance:
0/Carbon Compounds, Inorganic; 0/Phosphoric Acids; 0/Resin Cements; 0/Saliva, Artificial; 0/Silicon Compounds; 0/Tooth Bleaching Agents; 0/Transbond XT; 7722-84-1/Hydrogen Peroxide; E4GA8884NN/phosphoric acid; WXQ6E537EW/silicon carbide

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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