Document Detail


Effect of altering the type of enamel conditioner on the shear bond strength of a resin-reinforced glass ionomer adhesive.
MedLine Citation:
PMID:  10982929     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The purpose of this study was to determine the effects of changing the type of enamel conditioner on the shear bond strength of a resin-reinforced glass ionomer within half an hour after bonding the bracket to the tooth. Freshly extracted human molars were collected and stored in a solution of 0.1% (weight/volume) thymol. The teeth were cleaned and polished. The teeth were randomly separated into 4 groups according to the enamel conditioner/etchant and adhesive used: group I, teeth were conditioned with 10% polyacrylic acid and brackets were bonded with a resin-reinforced glass ionomer adhesive; group II, teeth were conditioned with 20% polyacrylic acid and brackets were bonded with a resin-reinforced glass ionomer adhesive; group III, teeth were etched with 37% phosphoric acid and the brackets were bonded with a resin-reinforced glass ionomer adhesive; group IV, teeth were etched with 37% phosphoric acid and the brackets were bonded with a composite adhesive. The results of the analysis of variance comparing the 4 experimental groups (F = 24.87) indicated the presence of significant differences between the groups (P =.0001). In general, the shear bond strengths were significantly greater in the 2 groups etched with 37% phosphoric acid. This was true for both the resin-reinforced glass ionomer (X = 6.1 +/- 2.7 MPa) and the composite (X = 5.2 +/- 2.9 MPa) adhesives. On the other hand, the shear bond strengths were significantly lower in the two groups conditioned with polyacrylic acid. The bond strength of the resin-reinforced glass ionomer adhesive conditioned with 10% polyacrylic acid (X = 0.4 +/- 1.0 MPa) was significantly lower than the group conditioned with 20% polyacrylic acid (&xmacr; = 3.3 +/- 2.6 MPa). The present findings indicated that the bond strength of the resin-reinforced glass ionomer adhesive can be significantly increased in the initial half hour after bonding if the enamel is etched with 37% phosphoric acid instead of being conditioned with either 10% or 20% polyacrylic acid. The clinician needs to take these properties into consideration when ligating the initial archwires.
Authors:
S E Bishara; L Vonwald; J F Laffoon; J R Jakobsen
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics     Volume:  118     ISSN:  0889-5406     ISO Abbreviation:  Am J Orthod Dentofacial Orthop     Publication Date:  2000 Sep 
Date Detail:
Created Date:  2000-10-19     Completed Date:  2000-10-19     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8610224     Medline TA:  Am J Orthod Dentofacial Orthop     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  288-94     Citation Subset:  D; IM    
Affiliation:
College of Dentistry, University of Iowa, Iowa City, IA 52242-1001, USA.
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MeSH Terms
Descriptor/Qualifier:
Acid Etching, Dental / methods*
Acrylic Resins
Aluminum Silicates
Analysis of Variance
Bisphenol A-Glycidyl Methacrylate
Chi-Square Distribution
Dental Bonding*
Dental Enamel* / drug effects
Dental Stress Analysis
Dentin-Bonding Agents
Glass Ionomer Cements*
Humans
Orthodontic Brackets*
Phosphoric Acids
Random Allocation
Resin Cements*
Statistics, Nonparametric
Tensile Strength
Chemical
Reg. No./Substance:
0/Acrylic Resins; 0/Aluminum Silicates; 0/Dentin-Bonding Agents; 0/Fuji Ortho LC; 0/Glass Ionomer Cements; 0/Phosphoric Acids; 0/Resin Cements; 135669-49-7/Transbond; 1565-94-2/Bisphenol A-Glycidyl Methacrylate; 7664-38-2/phosphoric acid; 9003-01-4/carbopol 940

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


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