| Effect of altering the type of enamel conditioner on the shear bond strength of a resin-reinforced glass ionomer adhesive. | |
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MedLine Citation:
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PMID: 10982929 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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S E Bishara; L Vonwald; J F Laffoon; J R Jakobsen |
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Publication Detail:
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Type: Comparative Study; Journal Article |
Journal Detail:
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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:
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Created Date: 2000-10-19 Completed Date: 2000-10-19 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8610224 Medline TA: Am J Orthod Dentofacial Orthop Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 288-94 Citation Subset: D; IM |
Affiliation:
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College of Dentistry, University of Iowa, Iowa City, IA 52242-1001, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Acid Etching, Dental
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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:
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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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