Document Detail

Effects of a self-etching primer and 37% phosphoric acid etching on enamel: a scanning electron microscopic study.
MedLine Citation:
PMID:  22917996     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: The purpose of this study was to compare the etching effects of a self-etching primer with 37% phosphoric acid on enamel by using a scanning electron microscope. Bond strength and the site of bond failure were also determined for brackets bonded using SEP and 37% phosphoric acid.
MATERIALS AND METHODS: A total of 60 maxillary premolar teeth were used for this study and they were divided into four groups. First two groups were used for studying the different types of etch patterns obtained and the next two groups were used to test the bond strength with the help of Universal testing machine. After debonding, the amount of residual adhesive was assessed according to adhesive remnant index using a stereomicroscope.
RESULTS: The majority of etch patterns obtained in the 37% phosphoric acid group were type II, whereas in the SEP group, type IV pattern was more common. There was no statistically significant difference between mean bond strengths obtained with the SEP group and the phosphoric acid group. Use of SEP results in less amount of residual adhesive on tooth surface after debonding.
CONCLUSION: SEP produces more conservative etch pattern compared to 37% phosphoric acid. Use of SEP for bonding provides similar and clinically acceptable bond strength compared to use of 37% phosphoric acid etching technique and requires less clean-up procedures hence, reduces enamel loss.
CLINICAL SIGNIFICANCE: Use of 37% phosphoric acid for orthodontic bonding yields high bond strength but, causes enamel loss during both etching and debonding. SEPs not only provide adequate bond strength with a more conservative etch pattern but also enable easy debonding, thereby reducing the enamel damage.
Lalita G Nanjannawar; Girish S Nanjannawar
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Publication Detail:
Type:  Comparative Study; Journal Article     Date:  2012-05-01
Journal Detail:
Title:  The journal of contemporary dental practice     Volume:  13     ISSN:  1526-3711     ISO Abbreviation:  J Contemp Dent Pract     Publication Date:    2012 May-Jun
Date Detail:
Created Date:  2012-08-24     Completed Date:  2013-03-18     Revised Date:  2014-07-31    
Medline Journal Info:
Nlm Unique ID:  101090552     Medline TA:  J Contemp Dent Pract     Country:  India    
Other Details:
Languages:  eng     Pagination:  280-4     Citation Subset:  D; IM    
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MeSH Terms
Chi-Square Distribution
Dental Bonding*
Dental Debonding
Dental Enamel / drug effects*,  ultrastructure
Dental Etching / methods*
Dental Stress Analysis
Materials Testing
Microscopy, Electron, Scanning
Orthodontic Brackets*
Phosphoric Acids
Resin Cements / chemistry*
Shear Strength
Reg. No./Substance:
0/Phosphoric Acids; 0/Resin Cements; E4GA8884NN/phosphoric acid

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

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