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

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          Abstract

          OBJECTIVE: To evaluate shear bond strength of 3 adhesive systems (Single Bond, TransbondTM MIP and TransbondTM 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 (TransbondTM XT, TransbondTM MIP and Single Bond) with or without saliva contamination. For each adhesive system, there were two groups defined as no contamination group (NC): 37% H3PO4 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 ºC 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. Two-way 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.

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          Clinical trials with crystal growth conditioning as an alternative to acid-etch enamel pretreatment.

          It has been claimed that different ion solutions containing sulfate induce crystal growth and might be a better alternative than conventional acid etching for enamel pretreatment in bracket bonding. It should thus combine optimal bond strength with easy and quick debonding. Two clinical experiments were performed to test this hypothesis. The first experiment dealt with the debonding procedure. Following conditioning with dilute sulfuric acid which contained sodium sulfate (to be termed solution A) on one side of the mouth and etching with 37% phosphoric acid on the other, brackets were bonded on the maxillary and mandibular incisors of twenty dental nurse students. Debracketing and a subsequent cleanup procedure were performed after 2 days. The mode of loosening was mainly between the enamel surface and adhesive on the crystal-growth-conditioned teeth and between the bracket mesh and adhesive on the teeth etched with phosphoric acid. This difference in mode of loosening was statistically significant (P less than 0.001). In the second experiment, which dealt with the clinical bond strength, 250 brackets were bonded in forty patients. One side served as a control and was conventionally acid etched. On the experimental side conditioning was done with solution A in thirty patients. In ten patients, 10% phosphoric acid was added to the dilute sulfuric acid used (to be termed solution B). Failure rates and modes of failure were recorded for a 6-month period.(ABSTRACT TRUNCATED AT 250 WORDS)
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            A review of direct orthodontic bonding

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              A Review of Direct Orthodontic Bonding

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                Author and article information

                Journal
                dpjo
                Dental Press Journal of Orthodontics
                Dental Press J. Orthod.
                Dental Press International (Maringá, PR, Brazil )
                2176-9451
                2177-6709
                April 2012
                : 17
                : 2
                : 30.e1-30.e6
                Affiliations
                [01] orgnameUFF
                [02] orgnameUFF
                [03] orgnameUFF
                Article
                S2176-94512012000200005 S2176-9451(12)01700205
                10.1590/S2176-94512012000200005
                4364995f-8d3f-4fb6-8c85-e150fcab2a38

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 24 November 2008
                : 12 August 2008
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 17, Pages: 0
                Product

                SciELO Brazil

                Categories
                Online Articles

                Enamel bonding,Shear bond strength,Saliva contamination

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