Colagem ortodôntica em esmalte com presença ou ausência de contaminação salivar: é necessário o uso de adesivo auto-condicionante ou de adesivo hidrofílico?

Objective: To evaluate, in vitro, the shear bond strength of self-curing (Concise TM -3M and Alpha Plast -DFL) and light-curing composites (Transbond TM XT -3M and Natural Ortho -DFL) used in orthodontics bonding, associated to Morelli metal brackets, with further analysis of adhesive remnant index (ARI) and enamel condition in scanning electron microscopy (SEM). Methods: Forty human premolars, just extracted and stored in physiologic solution 0.9 % were used. Randomly, these samples were divided in four groups: G1 group, the brackets were bonded with Concise TM -3M composite; in G2 group, Alpha Plast -DFL composite was used; in G3 group, Transbond TM XT -3M was used; in G4 group, Natural Ortho -DFL composite was used. These groups were submitted to shear strength tests in universal testing machine, at 0.5 mm per minute speed. Results: Statistical difference between G3 and G4 groups was recorded, as G4 showing higher strength resistance than G3. In the other hand, there were no statistical differences between G1, G2 and G3 and G1, G2 and G4 groups. ARI analysis showed that there was no statistical difference between the groups, and low scores were recorded among then. The scanning electron microscopy (SEM) analysis revealed the debonding spots and the enamel surface integrity. Conclusions: Shear bond strength was satisfactory and similar between the composites, however Natural Ortho -DFL revealed best comparing to Transbond TM XT -3M. Keywords: Composite resins. Shear strength. Scanning electron microscopy.How to cite this article: Neves MG, Brandão GAM, Almeida HA, Brandão AMM, Azevedo DR. In vitro analysis of shear bond strength and adhesive remnant index comparing light-curing and self-curing composites. Dental Press J Orthod. 2013 May-June;18(3):124-9.» The authors report no commercial, proprietary or financial interest in the products or companies described in this article. Objetivo: avaliar in vitro a resistência ao cisalhamento de compósitos autopolimerizáveis (Concise e Alpha Plast) e fotopolimerizáveis (Transbond XT e Natural Ortho) utilizados na colagem de braquetes metálicos da marca Morelli, analisando o índice de adesivo remanescente (ARI) e da integridade da superfície do esmalte por meio de microscopia eletrônica de varredura (MEV). Métodos: foram utilizados 40 pré-molares humanos extraídos. As raízes dos dentes foram incluídas em gesso-pedra especial, no interior de tubos de PVC usados para a confecção dos corpos de prova. Esses corpos de prova foram divididos em quatro grupos: grupo G1, braquetes associados ao compósito Concise; grupo G2, braquetes associados ao compósito Alpha Plast; grupo G3, braquetes associados ao compósito Transbond XT; e grupo G4, braquetes associados ao compósito Natural Ortho. Os grupos foram submetidos ao teste de cisalhamento em máqui-na universal de ensaios, a uma velocidade de 0,5mm por minuto. Resultados: houve diferença estatística entre os grupos G3 e G4, sendo os valores de G4 superiores; no entanto, não foram encontradas diferenças estatisticamente significativa...

Section: Discussionmentioning

confidence: 98%

In vitro analysis of shear bond strength and adhesive remnant index comparing light curing and self-curing composites

Neves

Brandão

Almeida³

et al. 2013

“…3,4,11,17 The substrate used in our study was bovine tooth enamel, as in other studies. 4,5,13,16 Bovine teeth are anatomically, histologically and chemically similar to human teeth, although bond strength result shows to be lower than those of human teeth. 8,9 In this study, the samples used for the bond strength trial were cylinders made of Transbond™ XT composite resin.…”

Section: E5mentioning

confidence: 98%

“…Other studies found higher bond strength results for Transbond™ MIP in dry environments, 3 and some authors believed that they were higher than recommended for orthodontic bracket bonding. 13 Therefore, not only bond strength, but also bonding characteristics, such as mechanisms and depth of penetration of different adhesives in the tags formed during enamel etching, are factors that should be evaluated and taken into consideration when making a decision about which materials to use.…”

Section: E5mentioning

confidence: 99%

“…5,6 However, when used in moist environments, its advantages over Transbond™ XT (3M Unitek Dental Products, Monrovia, CA), a conventional adhesive system, remain controversial. 4,15,16 In a dry environment, both have similar bond strength, 4,5,15,17 but Transbond™ MIP may present a significantly higher bond strength than necessary for bonding (18.31 MPa), 13 which may damage the enamel during debonding. Adhesive materials should have shear bond strengths compatible to the clinical needs.…”

Section: Introductionmentioning

confidence: 99%

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Influence of saliva contamination on the shear bond strength of adhesives on enamel

Assad-Loss¹,

Tostes²,

Mucha³

2012

Influence of saliva contamination on the shear bond strength of adhesives on enamel original articleObjective: To evaluate shear bond strength of 3 adhesive systems (Single Bond, Transbond™ MIP and Transbond™ XT) applied on bovine enamel under saliva contamination condition. Method:One hundred and twenty enamel surfaces of bovine incisors were divided into 6 groups (n = 20) according to the adhesive system used (Transbond™ XT, Transbond™ MIP and Single Bond) with or without saliva contamination. For each adhesive system, there were two groups defined as no contamination group (NC): 37% H 3 PO 4 conditioning for 30 seconds and two layers of adhesive systems; saliva contamination group (SC): After the first adhesive layer application, the examined areas were contaminated with saliva. Samples were mounted appropriately for testing and stored in deionized water at 37 °C for 7 days. Samples were then submitted to shear bond strength trials at a speed of 0.5 mm/min. The Adhesive Remnant Index (ARI) was evaluated under stereomicroscopy. Twoway analysis of variance and the Tukey test were used to compare mean values (α = 0.05).Results: Groups XT (NC) = 26.29 ± 7.23; MIP (NC) = 24.47 ± 7.52 and SB (NC) = 32.36 ± 4.14 XT (SC) = 19.59 ± 6.76; MIP (SC) = 18.08 ± 6.39 and SB (SC) = 18.18 ± 7.03 MPa. ARI 0 and 1 were the most prevalent scores in all study groups examined. Conclusion:Saliva contamination significantly decreased bond strength of the three adhesive systems examined (p <0.05). However, the comparison of groups with and without saliva contamination did not reveal any significant differences, and, therefore, the three systems may be considered equivalent.

“…According to the authors, these results may be related to (a) difficulty in maintaining proper isolation of the region, (b) inadequate adaptation of the attachment base to the tooth surface, (c) stronger masticatory forces, (d) different etching times, and (e) individual variations related to enamel composition. 8 Nowadays, however, given recent advances in primer quality 4,16,17 and in the bases of orthodontic attachments 11 manufactured for direct bonding, combined with awareness of the benefits of this procedure, it would be convenient to devise methods capable of increasing the efficiency of traditional bonding, notably in teeth subjected to higher masticatory impact, such as lower molars. In reviewing the literature, only one study was found which evaluated in vitro an alternative approach to reduce the percentage of failures in the direct bonding of molars.…”

Section: Introductionmentioning

confidence: 99%

Estudo in vitro da resistência ao cisalhamento da colagem direta de tubos ortodônticos em molares

Pinzan-Vercelino

Pinzan

Gurgel

et al. 2011

Objective: Although direct bonding takes up less clinical time and ensures increased preservation of gingival health, the banding of molar teeth is still widespread nowadays. It would therefore be convenient to devise methods capable of increasing the efficiency of this procedure, notably for teeth subjected to substantial masticatory impact, such as molars. This study was conducted with the purpose of evaluating whether direct bonding would benefit from the application of an additional layer of resin to the occlusal surfaces of the tube/tooth interface. Methods: A sample of 40 mandibular third molars was selected and randomly divided into two groups: Group 1 -Conventional direct bonding, followed by the application of a layer of resin to the occlusal surfaces of the tube/tooth interface, and Group 2 -Conventional direct bonding. Shear bond strength was tested 24 hours after bonding with the aid of a universal testing machine operating at a speed of 0.5mm/min. The results were analyzed using the independent t-test. Results: The shear bond strength tests yielded the following mean values: 17.08 MPa for Group 1 and 12.60 MPa for Group 2. Group 1 showed higher statistically significant shear bond strength than Group 2. Conclusions: The application of an additional layer of resin to the occlusal surfaces of the tube/tooth interface was found to enhance bond strength quality of orthodontic buccal tubes bonded directly to molar teeth. AbstractKeywords: Tooth bonding. Shear strength. Molar tooth.