International Journal of Experimental Dental Science

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VOLUME 10 , ISSUE 2 ( July-December, 2021 ) > List of Articles


The Shear Strength of Orthodontic Attachments Made from Different Composites and Glued in Enamel Conditioned by Two Different Techniques

Matheus Soledade Carvalho Santos, Carolina Palmito Pereira, Alex Roney Costa Silva, Uillian Mozart Ferreira da Mata Cerqueira, Lucianne Cople Maia de Faria, Matheus Melo Pithon

Keywords : Clear aligner, Orthodontics attachments, Shear strength

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.

DOI: 10.5005/jp-journals-10029-1233

License: CC BY-NC 4.0

Published Online: 17-02-2023

Copyright Statement:  Copyright © 2021; The Author(s).


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.

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