Citation Information :
Santos MS, Pereira CP, Silva AR, Cerqueira UM, Faria LC, Pithon MM. The Shear Strength of Orthodontic Attachments Made from Different Composites and Glued in Enamel Conditioned by Two Different Techniques. Int J Experiment Dent Sci 2021; 10 (2):58-62.
Background: The use of removable thermoplastic appliances has become an alternative to the use of conventional fixed appliances through gradual, sequential, and consecutive dental repositioning. Aligners have become a reality.
Objective: To evaluate the shear strength of orthodontic attachments made from different composites and affixed to enamel treated with two different conditioning techniques.
Materials and methods: A total of 150 bovine incisors were randomly divided into 10 groups (n = 15). In groups I, III, V, VII, and IX, the tooth enamel was etched with 37% phosphoric acid, and then an adhesive was applied. In groups II, IV, VI, VIII, and X, enamel etching was performed with the self-etching agent Transbond Plus Self-Etching Primer (TPSEP). The composites used were Filtek Bulk Fill Flowable (groups I and II), Filtek One Bulk Fill (groups III and IV), Filtek Z350 XT (groups V and VI), Filtek Z250 XT (groups VII and VIII), and Filtek Z100 (groups IX and X). The attachments were molded in a silicone matrix adapted to the buccal area of the teeth, and then light-curing was performed. The samples were stored in distilled water for 24 hours. Subsequently, shear strength tests were performed using a universal mechanical testing machine. The results were analyzed using analysis of variance (ANOVA) and Kruskal–Wallis test and Student's t-test (p = 0.05).
Results: There were no significant differences (p = 0.230) among most of the adhesive systems for bonding orthodontic attachments. However, group VII differed from groups II, III, VI, and X (p < 0.05).
Conclusion: The Filtek Z250 XT composite on teeth etched with 37% phosphoric acid produced the strongest bond. The bonding was weakest with the Filtek One Bulk Fill composite on teeth etched with 37% phosphoric acid.
Clinical significance: With the popularization of aligners, it is necessary to test the materials involved in this treatment modality. Knowing the best material for making the attachments provides a more predictive treatment.
Balbino ACD, Pithon MM, Braga E. Evaluation of the influence of the type of orthodontic bracket on the perception of age. J Res Dent 2018;6(2):29–34. DOI: 10.19177/jrd.v6e2201829-34
Jeremiah HG, Bister D, Newton JT. Social perceptions of adults wearing orthodontic appliances: a cross-sectional study. Eur J Orthod 2011;33(5):476–482. DOI: 10.1093/ejo/cjq069
Barreda GJ, Dzierewianko EA, Munoz KA, et al. Surface wear of resin composites used for Invisalign® attachments. Acta Odontol Latinoam 2017;30(2):90–95.
Gomez JP, Pena FM, Martinez V, et al. Initial force systems during bodily tooth movement with plastic aligners and composite attachments: a three-dimensional finite element analysis. Angle Orthod 2015;85(3):454–460. DOI: 10.2319/050714-330.1
Weckmann J, Scharf S, Graf I, et al. Influence of attachment bonding protocol on precision of the attachment in aligner treatments. J Orofac Orthop 2020;81(1):30–40. DOI: 10.1007/s00056-019-00204-7
Lobato M, Montero J, Fuentes MV, et al. Effect of adhesive application on the shear bond strength of refrigerated and pre-heated of different composite resins to orthodontic molar tubes. J Adhes Sci Technol 2013;27(20):2251–2264. DOI: 10.1080/01694243.2013.771096
Neves MG, Brandao GAM, de Almeida HA, et al. In vitro analysis of shear bond strength and adhesive remnant index comparing light curing and self-curing composites. Dental Press J Orthod 2013;18(3):124–129. DOI: 10.1590/s2176-94512013000300020
Zope A, Zope-Khalekar Y, Chitko SS, et al. Comparison of self-etch primers with conventional acid etching system on orthodontic brackets. J Clin Diagnostic Res 2016;10(12):ZC19–ZC22. DOI: 10.7860/JCDR/2016/18842.9031
Giannini M, Makishi P, Ayres APA, et al. Self-etch adhesive systems: a literature review. Braz Dent J 2015;26(1):3–10. DOI: 10.1590/0103-6440201302442
Pithon MM, De Oliveira Ruellas AC, Sant’Anna EF, et al. Shear bond strength of brackets bonded to enamel with a self-etching primer. Effects of increasing storage time after activation. Angle Orthod 2009;79(1):133–137. DOI: 10.2319/100207-472.1
Hamlin NJ, Bailey C, Motyka NC, et al. Effect of tooth-structure thickness on light attenuation and depth of cure. Oper Dent 2016;41(2):200–207. DOI: 10.2341/15-067-L
Taha NA, Maghaireh GA, Ghannam AS, et al. Effect of bulk-fill base material on fracture strength of root-filled teeth restored with laminate resin composite restorations. J Dent 2017;63:60–64. DOI: 10.1016/j.jdent.2017.05.016
Bilgii D, Dundar A, Barutcugil C, et al. Surface properties and bacterial adhesion of bulk-fill composite resins. J Dent 2020;95:103317. DOI: 10.1016/j.jdent.2020.103317
Sorake A, Rai R, Hegde G, et al. Comparison of shear bond strength of new self-etching primer with conventional self-etching primers: an in-vitro study. J Int oral Health 2015;7(7):17–21.
Yadala C, Gaddam R, Arya S, et al. Comparison of shear bond strength of three self-etching adhesives: an in-vitro study. J Int oral Heal 2015;7(7):53–57.