Bonding brackets on white spot lesions pretreated by means of two methods (original) (raw)
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Shear bond strength of brackets to demineralize enamel after different pretreatment methods
The Angle Orthodontist, 2012
Objective: To compare the influence of demineralized and variously pretreated demineralized enamel on the shear bond strength of orthodontic brackets. Materials and Methods: Sixty bovine enamel specimens were allocated to five groups (n = 12). Specimens of group 1 were not demineralized and were not pretreated, but served as controls. The other specimens were demineralized to form artificial carious lesions. Samples from group 2 were only demineralized and were kept untreated in artificial saliva. The other samples were pretreated with highly concentrated fluoride preparations (group 3: Elmex Gelee, 1.23% F; group 4: Clinpro White Varnish, 2.23% F) or with an infiltrating resin (group 5: Icon). After respective pretreatments, brackets were adhesively fixed on all specimens with an adhesive system after etching with 35% phosphoric acid and application of a primer and bracket resin cement (Transbond XT). Bracket shear bond strength was evaluated with a universal testing machine. Sta...
Evaluation of the bond strength of different bracket-bonding systems to bovine enamel
The European Journal of Orthodontics, 1997
In an experimental study the bond strength of stainless steel, ceramic and plastic brackets to bovine enamel was investigated by tensile testing. The brackets were cemented to the enamel using a conventional two-paste orthodontic bonding resin, a light-cured, fluoride-releasing adhesive, a no-mix-orthodontic bonding resin and a light-curing glass ionomer cement.
Research, Society and Development, 2021
The objective of this study to evaluate the effect of universal adhesives application time to enamel through shear bond strength (SBS), adhesive remnant index (ARI), and morphological enamel integrity. Bovine incisors were divided into four groups according to bonding system protocol (n=20): (1) conventional etch-and-rise adhesive – Transbond XT Primer (P-XT); (2) one-step self-etching adhesive – Transbond Self Etching Primer (T-SEP); (3) one universal adhesive – Single Bond Universal, which were rubbed for 20s (SBU-20) or (4) 40s (SBU-40). Transbond XT composite was used to bond the brackets to enamel. SBS was evaluated in a universal test machine at 0.5mm/minute. ARI was determined under x12.5 magnification and enamel damage was evaluated through scanning electron microscope (SEM) after debonding (n=10). SBS data were compared using one-way ANOVA and Tukey’s test. The Kruskal–Wallis test was used to compare the ARI scores (α =0.05). The P-XT and T-SEP groups showed significantly ...
World journal of orthodontics, 2010
To evaluate the shear bond strength of brackets bonded with resin-modified glass-ionomer cement (RMGIC) using various methods of enamel conditioning. Forty-five human premolars were randomly divided into five groups. The roots of these teeth were fixed in acrylic resin cylinders, and brackets were bonded to the teeth's crowns using the following material combinations: RMGIC only; RMGIC and corresponding primer; RMGIC, acid etching, and Scotchbond Multipurpose; RMGIC and two-step self-etching primer; and RMGIC and one-step primer. All specimens were submitted to pH cycling for 14 days before shear bond strength was assessed in a universal test machine. The medians and standard deviations (in MPa) were RMGIC only = 8.34 ± 1.11; RMGIC and corresponding primer = 7.05 ± 2.24; RMGIC, acid etching, and Scotchbond Multipurpose = 7.00 ± 4.79; RMGIC and two-step self-etching primer = 0.54 ± 0.30; and RMGIC and one-step primer = 10.61 ± 4.58. The value for RMGIC and two-step self-etching p...
Egyptian Dental Journal , 2012
objective: To examine the surface hardness of fluorosed teeth with and without the application of resin infiltration and also evaluate the shear bond strength and the adhesive remnant index. materials and methods: For hardness evaluation, a total number of 20 fluorosed premolars were used and divided into four equal groups of ; Group (1): Teeth were exposed to pH and thermocycling then Icon material , Group (2) same as group 1 then the brackets were applied (3) Same as group 2 but without application of the Icon material, Group (4) Teeth with aging as the control group. For the shear bond strength (SBS) test, another 20 premolars were used and divided randomly into four equal groups ; Group (1): Teeth with brackets , Group (2) Teeth with brackets exposed to pH and thermocycling for two weeks , Group (3) Teeth with brackets but with Icon materials applied prior to bonding of the brackets, and Group (4) Same as group 3 but exposed to pH and thermocycling for two weeks. The Adhesive Remnant Index (ARI) was assessed. results: Significant difference in the surface hardness with and without application of Icon was observed (224±18.4 and 176±12.3 Kgf/mm 2) at p≤0.05. For SBS , the highest values were obtained with Icon application (11.6 ± 3.127 and 10.1±2.548) MPa and the ARI scored 2 and 3. conclusions: Pretreatment of fluorosed teeth with resin infiltration improved the microhardness of enamel and the SBS of brackets and decreased the tendency of enamel fracture.
Adhesive systems effect over bond strength of resin-infiltrated and de/remineralized enamel
F1000Research
Background: The purpose of this study was to evaluate the effect of different bonding agents on bond-strength to demineralized enamel after remineralizing treatments and resin infiltration. Methods: Buccal enamel of 120 bovine incisors was polished and then were divided into five experimental groups: SE (sound enamel); DE (demineralized enamel); AS (demineralized enamel immersed in artificial saliva for eight weeks); NaF (demineralized enamel treated with 0.05% sodium fluoride solution (one minute) for eight weeks); Ic (demineralized enamel infiltrated with a low-viscosity resin (Icon-DGM). These groups were subdivided according to adhesive system used: self-etching adhesive Adper Easy One (3M/ESPE) and etch-and-rinse adhesive Single Bond (3M/ESPE). The composite resin blocks were fabricated using a Teflon matrix. A thermomechanical cycling machine was used to carry out the artificial aging of the specimens and thus were sectioned into sticks. The microtensile tests were performed u...
The European Journal of Orthodontics, 2013
The objective of this study was to test the effects of enamel deproteinization on bracket bonding with conventional and resin-modified glass ionomer cement (RMGIC). One hundred premolars, extracted for orthodontic reasons, were divided into five groups (n = 20). Group 1 (control): enamel was etched with 35 per cent phosphoric acid, a thin layer of adhesive was applied, and the brackets were bonded with Transbond XT. Group 2: enamel was etched with 10 per cent polyacrylic acid and the brackets were bonded with conventional glass ionomer cement (GIC). Group 3: enamel was treated with 5.25 per cent NaOCl, etched with 10 per cent polyacrylic acid, and the brackets were bonded with conventional GIC. Group 4: enamel was etched with 10 per cent polyacrylic acid and the brackets were bonded with RMGIC. Group 5: enamel was treated with 5.25 per cent NaOCl, etched with 10 per cent polyacrylic acid, and the brackets were bonded with RMGIC. The teeth were stored in distilled water for 24 hours before they were submitted to shear testing. The results demonstrated that bond strength values of group 1 (17.08 ± 6.39 MPa) were significantly higher in comparison with the other groups. Groups 2 (3.43 ± 1.94 MPa) and 3 (3.92 ± 1.57 MPa) presented values below the average recommended in the literature. With regard to adhesive remnant index, the groups in which the enamel was treated with NaOCl showed a behaviour similar to that of the resin composite. It is conclude with enamel treatment with NaOCl increased bonding strength of brackets bonded with GIC and RMGIC, but increased bond strength was not statistically significant when compared to the untreated groups.
Comparison of Shear Bond Strength of Adhesives to Enamel: An In Vitro Study
World journal of dentistry, 2024
high bond strength, predictable handling, and ease of use. 2,5 GC Corporation has introduced a novel self-etch adhesive resin that can be used for luting various direct and indirect restorations to enamel and dentin. Although the basic adhesion mechanism appears similar for all self-adhesive cements, these materials are still relatively new, and detailed information on their composition and adhesive properties is limited. Hence, the purpose of this study was to compare the SBS of novel G-CEM ONE (GC Corporation, Itabashi-Ku, Tokyo, Japan) and Maxcem Elite (Kerr Corporation, Orange, California, United States of America) to the enamel. The null hypothesis is that there are no statistically significant differences between the shear bond strengths (SBSs) of the two materials and also between the etched and the nonetched surfaces of the tooth used for bonding. Materials a n d Methods The study design chosen was an in vitro study with the IEC number 2019/P/CONS/71. The study duration was from November to December 2019. For this study, 40 caries-free human premolars,