| Effect of an acidic primer on shear bond strength of orthodontic brackets. | |
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MedLine Citation:
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PMID: 9743128 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A unique characteristic of some new etching systems is that they combine the conditioning and priming agents into a single acidic primer solution. The purpose of this study was to determine the effects on the shear bond strength and the bracket/adhesive failure mode when an acidic primer and other enamel etchants were used to condition the enamel surface before bonding. The brackets were bonded to extracted human teeth according to one of four protocols following the manufacturers instructions. Group I, teeth were etched with 37% phosphoric acid, the brackets were then bonded with System 1+ adhesive (Ormco Corporation. Orange, Calif.); group II, teeth were etched with 10% maleic acid, the brackets were also bonded with System 1+ adhesive; group III, an acidic primer that contains both the acid (phenyl-P) and the primer (hema and dimethacrylate) were placed on the enamel for 30 seconds. The adhesive used on this group was a lightly filled resin that contains Bis-GMA and HEMA. (Clearfil Liner Bond 2. J.C. Moritta, Kuraway, Japan); Group IV, the same acidic primer was used as in group II, the adhesive used was highly filled (Panavia 21. J.C. Moritta) and contains Bis-GMA. The present in vitro findings indicated that the use of acidic primers to bond orthodontic brackets to the enamel surface could provide clinically acceptable shear bond forces (x = 10.4 +/- 4.4 MPa) when used with a highly (77%) filled adhesive (Panavia 21). These debonding forces were comparable to those obtained when the enamel was conditioned with either Phosphoric (x = 11.8 +/- 4.1 MPa) or Maleic (x = 10.9 +/- 4.4 MPa) acids. With the use of a lightly (10%) filled adhesive (Clearfil Liner Bond 2), the shear bond strength was significantly lower (x = 5.9 +/- 5.6 MPa). It is of interest to note that there was a tendency to have less residual adhesive remaining on the tooth when an acid primer was used than when phosphoric and maleic acids were used. This might be of advantage to the clinician because it will require less time to clean the teeth after debonding. |
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Authors:
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S E Bishara; V V Gordan; L VonWald; M E Olson |
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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: 114 ISSN: 0889-5406 ISO Abbreviation: Am J Orthod Dentofacial Orthop Publication Date: 1998 Sep |
Date Detail:
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Created Date: 1998-09-23 Completed Date: 1998-09-23 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: 243-7 Citation Subset: D; IM |
Affiliation:
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Orthodontic Department, College of Dentistry, University of Iowa, Iowa City 52242, 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* Adhesiveness Analysis of Variance Bisphenol A-Glycidyl Methacrylate Dental Bonding / methods* Dental Debonding Dental Enamel / drug effects Dentin-Bonding Agents Humans Maleates / pharmacology Materials Testing Methacrylates Orthodontic Brackets* Phosphates Phosphoric Acids / pharmacology Resin Cements / chemistry Statistics, Nonparametric Tensile Strength |
| Chemical | |
Reg. No./Substance:
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0/Clearfil Linerbond System; 0/Dentin-Bonding Agents; 0/Maleates; 0/Methacrylates; 0/Panavia TPN-S; 0/Phosphates; 0/Phosphoric Acids; 0/Resin Cements; 110-16-7/maleic acid; 1565-94-2/Bisphenol A-Glycidyl Methacrylate; 7664-38-2/phosphoric acid; 868-77-9/hydroxyethyl methacrylate |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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