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Effect of self-etchant pH on the shear bond strength of orthodontic brackets.
Am J Orthod Dentofacial Orthop. 2008 Aug; 134(2):203-8.AJ

Abstract

INTRODUCTION

Self-etching primers (SEPs) have been used successfully during bonding to reduce technique sensitivity while minimizing the etching of enamel. Although serving the same purpose, SEPs differ in acidity and aggressiveness. Thus, the purpose of this study was to determine whether the pH of SEPs affects the shear bond strength of orthodontic brackets.

METHODS

Forty-five molars were cleaned, mounted, and randomly divided into 3 groups with different SEPs: in group 1 (control), 15 orthodontic brackets were bonded to the teeth with Transbond Plus (3M Unitek, Monrovia, Calif) with a pH of about 1.0; in group 2, 15 brackets were bonded with Adper Prompt L-Pop (3M ESPE, St Paul, Minn) with a pH of 0.9 to 1.0; in group 3, 15 brackets were bonded with Clearfil S3 Bond (Kuraray America, New York, NY), with a pH of 2.7. All teeth were bonded with Transbond XT paste (3M Unitek). The teeth were debonded within half an hour after initial bonding by using a universal testing machine. The residual adhesive on each tooth was evaluated. ANOVA was used to compare the shear bond strength (SBS) of the 3 groups, and the chi-square test was used to compare the adhesive remnant index (ARI) scores for the 3 groups.

RESULTS

ANOVA indicated significant differences between the groups. The Duncan multiple range test indicated that Clearfil S3 Bond produced a significantly stronger mean SBS (6.5 +/- 1.9 MPa) than the Transbond Plus system (mean, 4.2 +/- 1.9 MPa). No significant differences were seen between the SBS of the brackets bonded with Adper (mean, 5.9 +/- 3.4 MPa) and the other 2 groups. The comparisons of the ARI scores between the 3 groups indicated that bracket failure mode was not significantly different.

CONCLUSIONS

The SEP with the highest pH (least acidic), Clearfil S3 Bond, bonded brackets successfully and with the strongest SBS; this suggests that the pH of the SEP is not the primary determinant of the SBS. The clinician should be aware that some SEPs can leave the enamel surface healthier after debonding.

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Authors+Show Affiliations

Ostby AW
College of Dentistry, University of Iowa, Iowa City, IA 52242-1001, USA. sbishara@msn.com
Bishara SE
No affiliation info available
Denehy GE
No affiliation info available
Laffoon JF
No affiliation info available
Warren JJ
No affiliation info available

MeSH

Analysis of VarianceBisphenol A-Glycidyl MethacrylateChi-Square DistributionDental BondingDental DebondingDental EnamelDental EtchingDental Stress AnalysisEquipment Failure AnalysisHumansHydrogen-Ion ConcentrationMaterials TestingOrganophosphatesOrthodontic BracketsResin CementsShear StrengthSurface Properties

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

18675201

Citation

Ostby, Adam W., et al. "Effect of Self-etchant pH On the Shear Bond Strength of Orthodontic Brackets." 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. 134, no. 2, 2008, pp. 203-8.
Ostby AW, Bishara SE, Denehy GE, et al. Effect of self-etchant pH on the shear bond strength of orthodontic brackets. Am J Orthod Dentofacial Orthop. 2008;134(2):203-8.
Ostby, A. W., Bishara, S. E., Denehy, G. E., Laffoon, J. F., & Warren, J. J. (2008). Effect of self-etchant pH on the shear bond strength of orthodontic brackets. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 134(2), 203-8. https://doi.org/10.1016/j.ajodo.2006.07.039
Ostby AW, et al. Effect of Self-etchant pH On the Shear Bond Strength of Orthodontic Brackets. Am J Orthod Dentofacial Orthop. 2008;134(2):203-8. PubMed PMID: 18675201.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of self-etchant pH on the shear bond strength of orthodontic brackets. AU - Ostby,Adam W, AU - Bishara,Samir E, AU - Denehy,Gerald E, AU - Laffoon,John F, AU - Warren,John J, PY - 2006/05/01/received PY - 2006/07/01/revised PY - 2006/07/01/accepted PY - 2008/8/5/pubmed PY - 2008/8/30/medline PY - 2008/8/5/entrez SP - 203 EP - 8 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 - 134 IS - 2 N2 - INTRODUCTION: Self-etching primers (SEPs) have been used successfully during bonding to reduce technique sensitivity while minimizing the etching of enamel. Although serving the same purpose, SEPs differ in acidity and aggressiveness. Thus, the purpose of this study was to determine whether the pH of SEPs affects the shear bond strength of orthodontic brackets. METHODS: Forty-five molars were cleaned, mounted, and randomly divided into 3 groups with different SEPs: in group 1 (control), 15 orthodontic brackets were bonded to the teeth with Transbond Plus (3M Unitek, Monrovia, Calif) with a pH of about 1.0; in group 2, 15 brackets were bonded with Adper Prompt L-Pop (3M ESPE, St Paul, Minn) with a pH of 0.9 to 1.0; in group 3, 15 brackets were bonded with Clearfil S3 Bond (Kuraray America, New York, NY), with a pH of 2.7. All teeth were bonded with Transbond XT paste (3M Unitek). The teeth were debonded within half an hour after initial bonding by using a universal testing machine. The residual adhesive on each tooth was evaluated. ANOVA was used to compare the shear bond strength (SBS) of the 3 groups, and the chi-square test was used to compare the adhesive remnant index (ARI) scores for the 3 groups. RESULTS: ANOVA indicated significant differences between the groups. The Duncan multiple range test indicated that Clearfil S3 Bond produced a significantly stronger mean SBS (6.5 +/- 1.9 MPa) than the Transbond Plus system (mean, 4.2 +/- 1.9 MPa). No significant differences were seen between the SBS of the brackets bonded with Adper (mean, 5.9 +/- 3.4 MPa) and the other 2 groups. The comparisons of the ARI scores between the 3 groups indicated that bracket failure mode was not significantly different. CONCLUSIONS: The SEP with the highest pH (least acidic), Clearfil S3 Bond, bonded brackets successfully and with the strongest SBS; this suggests that the pH of the SEP is not the primary determinant of the SBS. The clinician should be aware that some SEPs can leave the enamel surface healthier after debonding. SN - 1097-6752 UR - https://www.unboundmedicine.com/medline/citation/18675201/Effect_of_self_etchant_pH_on_the_shear_bond_strength_of_orthodontic_brackets_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889-5406(08)00270-9 DB - PRIME DP - Unbound Medicine ER -