A comparative clinical study of the failure rate of orthodontic brackets bonded with two adhesive systems: conventional and self-etching primer (SEP)

Abstract

Objective: This study compared the clinical performance of orthodontic brackets bonded with Transbond adhesive paste after two priming systems: a two-stage conventional system (acid etching + Transbond XT adhesive primer) and a singlestage self-etching primer (SEP) (Transbond Plus). Methods: The sample comprised 480 metal brackets bonded to the teeth of 24 consecutive patients treated for 36 to 48 months. A split-mouth design was used for bonding, and both systems were used in each patient. Bracket failure rates for each system were analyzed; and failure causes as reported by the patients and the quadrant of teeth for which brackets failed were recorded. Results: The conventional system group had a failure rate of 5.41%, whereas the rate for SEP was 4.58%. In this group, there were 5 failures (38.4%) in the right maxillary quadrant, 2 (15.4%) in the left maxillary quadrant, 4 (30.8%) in the right mandibular quadrant, and 2 (15.4%) in the left mandibular quadrant. In the SEP group, there were 4 (36.4%) failures in the right maxillary quadrant, 1 (9%) in the left maxillary quadrant, 3 (27.3%) in the right mandibular quadrant, and 3 (27.3%) in the left mandibular quadrant. Results of descriptive statistical analysis and odds ratio did not show any significant differences between rates (p = 0.67). Conclusion: The clinical efficiency of SEP was similar to that of the conventional system. » The author reports no commercial, proprietary or financial interest in the products or companies described in this article.original article Objetivo: o objetivo do presente estudo foi comparar o desempenho clínico da colagem de braquetes ortodônticos com resina Transbond (3M Unitek) associada a dois sistemas adesivos: convencional em duas etapas (ataque ácido + Transbond XT adhesive Primer) e Self-Etching Primer (SEP), em etapa única (Transbond Plus). Métodos: a amostra foi constituída de 480 braquetes metálicos (Victory, 3M Unitek), colados em 24 pacientes, que foram tratados durante um período de 36 a 48 meses. A colagem foi feita por meio do sistema split-mouth, utilizando os dois sistemas de colagem em cada paciente. Foi analisada a taxa de queda dos braquetes para cada sistema de colagem, descrita a causa da queda conforme relato do paciente e a posição dos dentes nas arcadas. Resultados: o sistema adesivo convencional apresentou taxa de queda de 5,41%, enquanto a do SEP foi de 4,58%. O sistema convencional apresentou 5 quedas (38,4%) no quadrante superior direito, 2 (15,4%) no quadrante superior esquerdo, 4 (30,8%) no quadrante inferior direito e 2 (15,4%) no quadrante inferior esquerdo. O SEP apresentou 4 quedas (36,4%) no quadrante superior direito, 1 (9%) no quadrante superior esquerdo, 3 (27,3%) no quadrante inferior direito e 3 (27,3%) no quadrante inferior esquerdo. Por meio da análise estatística descritiva e do teste Odds Ratio, constatou-se que não houve diferença significativa entre essas taxas (p = 0,67). Conclusão: com base nesses resultados, pode-se concluir que o sistema adesivo SEP apresentou eficácia clínica s...

Effect of different bonding protocols on degree of monomer conversion and bond strength between orthodontic brackets and enamel

“…3,4 Factors that can influence clinical performance include bracket design and type 5 , composition of the orthodontic wire 6 , and, especially, the resins and adhesive systems used for bracket bonding. 7,8 Adhesion failures between bracket and tooth surface compromise the success of the orthodontic treatment, are costly, and cause inconvenience to the patient. 3 Bonding brackets to dental enamel is a routine procedure in Orthodontics and it usually follows the protocol proposed by Buonocore 9 in which the enamel surface is conditioned with 37% phosphoric acid to increase adhesiveness.…”

Effect of Enamel Pretreatment with Pastes Presenting Different Relative Dentin Abrasivity (RDA) Values on Orthodontic Bracket Bonding Efficacy of Microfilled Composite Resin: In Vitro Investigation and Randomized Clinical Trial

“…Various clinical studies tried to estimate the failure rate of orthodontic brackets, comparing brackets of different materials [8], types of orthodontic bonding [23], adhesion procedures [46] and adhesive materials [7,17,47]. In addition, retrospective studies investigated the issue, trying to assess correlations between brackets' failure rate and multiple variables [11,12,48].…”

“…For the other group, in which a flowable resin composite was used (Heliosit Orthodontic, Ivoclar Vivadent AG, Schaan, Liechtenstein), a lower failure rate (6%) was reported. The study of Dominguez et al [46] compared two different adhesion protocols: 37% etching + Transbond XT paste and Transbond Self Etch Primer + Transbond XT paste (3M Unitek, Monrovia, CA, USA) with previous pumicing with a rubber cup. The survival rates for the two groups were, respectively, 5.41% and 4.58%.…”

A Clinical Comparison of Failure Rates of Metallic and Ceramic Brackets: A Twelve-Month Study

“…e failure rate of the metal brackets is reported to be much higher during the first 6 months of the treatment [16,38,40,41]. In the studies where the failure rates of the metal brackets bonded with the self-etching primer system were analysed after 6 and 12 months of treatment, it was found that 50-68% of detachments occurred within the first half year of the therapy [15,42].…”

“…e adhesive-enamel interface has been well tested as evidenced by numerous articles dedicated to both in vivo and in vitro tests. ese surveys mostly assessed the application of self-etching primer which is still controversial [15][16][17][18][19]. e evaluation of identical adhesive systems and two different orthodontic brackets makes it possible to compare the bond strength between the adhesive and the bracket.…”