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Effects of various methods of chlorhexidine application on shear bond strength.
Am J Orthod Dentofacial Orthop. 1998 Aug; 114(2):150-3.AJ

Abstract

Chlorhexidine has been applied on the teeth and over orthodontic appliances during treatment in order to reduce bacterial colonization. The purpose of this study was to determine whether the application of chlorhexidine with or without a sealant, to the etched enamel will affect the shear bond strength and the bracket/adhesive failure modes of orthodontic brackets. A total of 132 extracted third molars were cleaned and then divided into 6 groups of at least 20 teeth each. The teeth were etched with a 37% phosphoric acid gel and a sealant was applied in 5 of the groups. Stainless steel orthodontic brackets were then bonded with the Transbond XT bonding system. The chlorhexidine was applied to the teeth either as a prophylactic paste or as a varnish under the following conditions: (1) as a varnish over the bracket and tooth surfaces after the bonding procedure was completed; (2) as a prophylactic paste containing 0.12% chlorhexidine over the intact enamel i.e., before etching; (3) mixed with the sealant and applied to the etched enamel before bonding, (4) as a varnish applied to the etched enamel with no sealant used; (5) as a varnish over the light cured sealant; and (6) as a varnish over the sealant before the sealant was light cured. All teeth were mounted in phenolic rings and stored in deionized water at 37 degrees C for 48 hours. A Zwick Universal Testing Machine was used to determine shear bond strengths. The residual adhesive on the enamel surface was evaluated with the Adhesive Remnant Index. The analysis of variance and chi square tests were used to compare the six groups. Significance was predetermined at the p < or = 0.05. The findings in this study indicated that shear bond strength was not significantly affected when chlorhexidine was applied; (1) over the bracket and tooth surfaces after the bonding procedure was completed (mean = 12.3 +/- 3.1 MPa), (2) as a prophylactic paste over the unetched enamel surface before the bonding procedure is initiated (mean = 9.6 +/- 2.3 MPa), and (3) when the varnish was premixed with the sealant and applied on the etched enamel surface (mean 11.8 +/- 2.1 MPa). On the other hand, in all the experimental groups in which the chlorhexidine varnish was applied as a layer on the etched enamel surface or over the sealant, shear bond strength values and bracket failure rates were of a magnitude that made them clinically unacceptable.

Authors+Show Affiliations

College of Dentistry, University of Iowa, Iowa City 52242, USA.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

9714279

Citation

Bishara, S E., et al. "Effects of Various Methods of Chlorhexidine Application On Shear Bond Strength." American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, vol. 114, no. 2, 1998, pp. 150-3.
Bishara SE, Vonwald L, Zamtua J, et al. Effects of various methods of chlorhexidine application on shear bond strength. Am J Orthod Dentofacial Orthop. 1998;114(2):150-3.
Bishara, S. E., Vonwald, L., Zamtua, J., & Damon, P. L. (1998). Effects of various methods of chlorhexidine application on shear bond strength. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 114(2), 150-3.
Bishara SE, et al. Effects of Various Methods of Chlorhexidine Application On Shear Bond Strength. Am J Orthod Dentofacial Orthop. 1998;114(2):150-3. PubMed PMID: 9714279.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of various methods of chlorhexidine application on shear bond strength. AU - Bishara,S E, AU - Vonwald,L, AU - Zamtua,J, AU - Damon,P L, PY - 1998/8/26/pubmed PY - 1998/8/26/medline PY - 1998/8/26/entrez SP - 150 EP - 3 JF - American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics JO - Am J Orthod Dentofacial Orthop VL - 114 IS - 2 N2 - Chlorhexidine has been applied on the teeth and over orthodontic appliances during treatment in order to reduce bacterial colonization. The purpose of this study was to determine whether the application of chlorhexidine with or without a sealant, to the etched enamel will affect the shear bond strength and the bracket/adhesive failure modes of orthodontic brackets. A total of 132 extracted third molars were cleaned and then divided into 6 groups of at least 20 teeth each. The teeth were etched with a 37% phosphoric acid gel and a sealant was applied in 5 of the groups. Stainless steel orthodontic brackets were then bonded with the Transbond XT bonding system. The chlorhexidine was applied to the teeth either as a prophylactic paste or as a varnish under the following conditions: (1) as a varnish over the bracket and tooth surfaces after the bonding procedure was completed; (2) as a prophylactic paste containing 0.12% chlorhexidine over the intact enamel i.e., before etching; (3) mixed with the sealant and applied to the etched enamel before bonding, (4) as a varnish applied to the etched enamel with no sealant used; (5) as a varnish over the light cured sealant; and (6) as a varnish over the sealant before the sealant was light cured. All teeth were mounted in phenolic rings and stored in deionized water at 37 degrees C for 48 hours. A Zwick Universal Testing Machine was used to determine shear bond strengths. The residual adhesive on the enamel surface was evaluated with the Adhesive Remnant Index. The analysis of variance and chi square tests were used to compare the six groups. Significance was predetermined at the p < or = 0.05. The findings in this study indicated that shear bond strength was not significantly affected when chlorhexidine was applied; (1) over the bracket and tooth surfaces after the bonding procedure was completed (mean = 12.3 +/- 3.1 MPa), (2) as a prophylactic paste over the unetched enamel surface before the bonding procedure is initiated (mean = 9.6 +/- 2.3 MPa), and (3) when the varnish was premixed with the sealant and applied on the etched enamel surface (mean 11.8 +/- 2.1 MPa). On the other hand, in all the experimental groups in which the chlorhexidine varnish was applied as a layer on the etched enamel surface or over the sealant, shear bond strength values and bracket failure rates were of a magnitude that made them clinically unacceptable. SN - 0889-5406 UR - https://www.unboundmedicine.com/medline/citation/9714279/Effects_of_various_methods_of_chlorhexidine_application_on_shear_bond_strength_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889-5406(98)00176-0 DB - PRIME DP - Unbound Medicine ER -