Resistência ao cisalhamento de braquetes metálicos utilizando sistema adesivo autocondicionante

Melgaço, Camilo Aquino; Andrade, Graciele Guerra de; Araújo, Mônica Tirre de Souza; Nojima, Lincoln Issamu

doi:10.1590/s2176-94512011000400013

Cited by 5 publications

(4 citation statements)

References 19 publications

(24 reference statements)

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“…As surface treatment methods become more complicated, the clinical application of these methods become more difficult, which means that finding a simple method to enhance the bond strength becomes imperative. To increase the bond strength, a variety of surface treatments [17,18,19] such as rough polishing, sandblasting with high strength particles, glass coating, acid etching, laser treatment, and primer treatments have been reported [14,20,21,22,23]. …”

Section: Introductionmentioning

confidence: 99%

Shear Bond Strength of Al2O3 Sandblasted Y-TZP Ceramic to the Orthodontic Metal Bracket

2017

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As the proportion of adult orthodontic treatment increases, mainly for aesthetic reasons, orthodontic brackets are directly attached to yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) restorations. This, study analyzed the shear bond strength (SBS) between various surface treated Y-TZP and orthodontic metal brackets. The Y-TZP specimens were conditioned by 110 μm Al2O3 sandblasting, or sandblasting followed by coating with one of the primers (silane, MDP, or an MDP-containing silane primer). After surface treatment, the orthodontic metal bracket was bonded to the specimen using a resin cement, and then 24 h storage in water and thermal cycling (5000 cycles, 5–55 °C), SBS was measured. Surface roughness was analyzed for surface morphology, and X-ray photoelectron spectroscopy (XPS) was employed for characterization of the chemical bond between the Y-TZP and the MDP-based primers (MDP, MDP containing silane primer). It was found that after surface treatment, the surface roughness of all groups increased. The groups treated with 110 μm Al2O3 sandblasting and MDP, or MDP-containing silane primer showed the highest SBS values, at 11.92 ± 1.51 MPa and 13.36 ± 2.31 MPa, respectively. The SBS values significantly decreased in all the groups after thermal cycling. Results from XPS analysis demonstrated the presence of chemical bonds between Y-TZP and MDP. Thus, the application of MDP-based primers after Al2O3 sandblasting enhances the resin bond strength between Y-TZP and the orthodontic metal bracket. However, bonding durability of all the surface-treated groups decreased after thermal cycling.

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Section: Introductionmentioning

confidence: 99%

Shear Bond Strength of Al2O3 Sandblasted Y-TZP Ceramic to the Orthodontic Metal Bracket

2017

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“…It is known that the ideal adhesive material should have adequate bond strength to the tooth, and during debonding, should be removed without damaging the dental enamel by keeping its initial condition as much as possible (LAMPER et al, 2014). The shear bond strength test is the method of choice to assess the efficacy of orthodontic adhesive systems (RIBEIRO et al, 2008;MELGAÇO et al, 2011;CÂMARA et al, 2017). The scientific literature points out that the minimum value of shear bond strength for clinical use ranges from 5.9 to 7.8 MPa (REYNOLDS, 1975;REYNOLDS;VON FRAUNHOFER, 1977).…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…Transbond XT composite, which has been used by the majority of the studies for comparative assessment with other ones, was also used here as an adhesive agent (RIBEIRO et al, 2008;MELGAÇO et al, 2011;BERTOZ et al, 2012). This composite is the gold standard material in several in vitro studies as it has bond strength values ranging from 7 to 19 MPa (RIBEIRO et al, 2008;MELGAÇO et al, 2011;CÂMARA et al, 2017). By comparing the results of the present study with the reference values reported by Reynolds and von Fraunhofer (1977), as well as with previous studies using the same composite and orthodontic tubes modified by welding a metal mesh to their base (RIBEIRO et al, 2008;MELGAÇO et al, 2011;BERTOZ et al, 2012), it was found that the bond strength values were very close to the minimum value set by Reynolds (1975), but lower than to those of more recent studies (RIBEIRO et al, 2008;MELGAÇO et al, 2011;CÂMARA et al, 2017).…”

Section: Resultsmentioning

confidence: 99%

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Influência Da Modificação Da Base De Colagem E Da Contaminação Salivar Na Resistência De União De Tubos Ortodônticos Colados Ao Esmalte Humano

Brandão¹,

Maltagliati²,

Nahás-Scocate³

et al. 2021

Rev. Uningá

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The objective of this in vitro study was to assess and compare the shear bond strength of conventional and modified orthodontic tubes bonded to the surface of dry and saliva-contaminated enamel. The sample consisted of 40 human teeth, which were randomly divided into four groups according to attachment base and presence or absence of saliva contamination as follows: Group CB, conventional orthodontic tubes without salivary contamination; Group CB-S, conventional orthodontic tubes with salivary contamination; Groups BM, orthodontic tubes modified by welding a metal mesh to their base without salivary contamination; and Group BM-S, modified orthodontic tubes with salivary contamination. Shear bond strength test was performed in a universal testing machine and analysis of the adhesive remnant index (ARI) by optical microscopy. Two-way ANOVA was used, followed by Tukey’s test at a statistical significance level of 5%. The ARI results were analysed descriptively. There was statistically significant difference between the groups regarding the shear bond strength values, with conventional tubes presenting significantly higher values (P < 0.05). In addition, the presence of salivary contamination interfered negatively with the behaviour of conventional tubes only (P < 0.05). Shear bond strength was not improved by increasing the area of the orthodontic tubes. Moreover, salivary contamination influenced negatively the SBS values, but only when conventional tubes were used.

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Shear Bond Strength of Metal Brackets Recycling with Aluminum Oxide

Melo¹,

Youssef²

2020

J. Dentists

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Objective: to evaluate the shear bond strength of metal brackets subjected to recycling with aluminum oxide. Methods: 20 premolars were used, divided into two groups (n = 10) according to the brackets used (G1: Morelli® Light and G2: Morelli® Max). The teeth were autoclaved, included in ¾-inch PVC tubes, perpendicular to the ground. The brackets were fixed on the dental crowns with the TransbondTM XT kit (3M Unitek). The specimens were subjected to thermal cycling. The shear test was performed on the Instron® 5582 testing machine, at a speed of 0.5mm / min. The brackets were recycling with aluminum oxide 24 hours after the test. A new shear was performed, similar to the first. The buccal faces of the teeth were qualified through the IRA in both tests. The data were submitted to statistical analysis using the Kruskal-Wallis, ANOVA and Tukey tests (p <0.05). Results: in the first shear, the bond strength values of Morelli® Max brackets (35,00MPa) were statistically higher than those of Morelli®Light (23,86MPa). In the second, the resistances were statistically similar (Morelli®Max: 37,19 MPa and Morelli®Light: 45,18 MPa). The Morelli® Light bracket was influenced by the recycling of aluminum oxide, with a significant increase in resistance from the first to the second test. There was no significance for the values of the IRA scores in both trials. Conclusion: recycling with aluminum oxide influenced the shear bond strength of the Morelli®Light bracket, causing an increase in adhesion strength; the Morelli® Max bracket was superior to Morelli® Light before recycling; after recycling, the brackets had similar behaviors.

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Resistência ao cisalhamento de braquetes metálicos utilizando sistema adesivo autocondicionante

Cited by 5 publications

References 19 publications

Shear Bond Strength of Al2O3 Sandblasted Y-TZP Ceramic to the Orthodontic Metal Bracket

Shear Bond Strength of Al2O3 Sandblasted Y-TZP Ceramic to the Orthodontic Metal Bracket

Influência Da Modificação Da Base De Colagem E Da Contaminação Salivar Na Resistência De União De Tubos Ortodônticos Colados Ao Esmalte Humano

Shear Bond Strength of Metal Brackets Recycling with Aluminum Oxide

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