Comparison of wire loop and shear blade as the 2 most common methods for testing orthodontic shear bond strength

Mojtahedzadeh, F; Akhoundi, Mohammad Sadegh Ahmad; Noroozi, Hassan

doi:10.1016/j.ajodo.2006.03.021

Cited by 15 publications

(14 citation statements)

References 11 publications

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“… 17 When the specimens were stored only in water without thermocycling, the bond strengths to ceramics and the incidence of cohesive ceramic fractures were found to be excessively high. 19 In this study, no ceramic fractures were found, probably indicating that the exposure to water and temperature changes involved in thermocycling mainly affected the bond of the resin composite to the metal bracket base ( Table 4 ). 18 However, de Oliveira et al 26 reported that the bracket bond strength to enamel was significantly improved after thermocycling.…”

Section: Discussionmentioning

confidence: 55%

“…In this study, shear bond strength was tested using the wire loop method. Mojtahedzadeh et al 19 suggested that this method might more closely reproduce clinical loads than the shear blade method. In addition, thermocycling (1,000 cycles) was applied prior to debonding to approximate clinical reality.…”

Section: Discussionmentioning

confidence: 99%

“…Shear bond strength tests were performed by the wire loop method previously described by Mojtahedzadeh et al 19 The bonded specimens were mounted in a jig attached to a universal testing machine (3343, Instron Inc., Canton, MA, USA). A 0.018 × 0.025 inch stainless steel wire was engaged under tie wings.…”

Section: Methodsmentioning

confidence: 99%

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Orthodontic bracket bonding to glazed full-contour zirconia

et al. 2016

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ObjectivesThis study evaluated the effects of different surface conditioning methods on the bond strength of orthodontic brackets to glazed full-zirconia surfaces.Materials and MethodsGlazed zirconia (except for the control, Zirkonzahn Prettau) disc surfaces were pre-treated: PO (control), polishing; BR, bur roughening; PP, cleaning with a prophy cup and pumice; HF, hydrofluoric acid etching; AA, air abrasion with aluminum oxide; CJ, CoJet-Sand. The surfaces were examined using profilometry, scanning electron microscopy, and electron dispersive spectroscopy. A zirconia primer (Z-Prime Plus, Z) or a silane primer (Monobond-S, S) was then applied to the surfaces, yielding 7 groups (PO-Z, BR-Z, PP-S, HF-S, AA-S, AA-Z, and CJ-S). Metal bracket-bonded specimens were stored in water for 24 hr at 37℃, and thermocycled for 1,000 cycles. Their bond strengths were measured using the wire loop method (n = 10).ResultsExcept for BR, the surface pre-treatments failed to expose the zirconia substructure. A significant difference in bond strengths was found between AA-Z (4.60 ± 1.08 MPa) and all other groups (13.38 ± 2.57 - 15.78 ± 2.39 MPa, p < 0.05). For AA-Z, most of the adhesive remained on the bracket.ConclusionsFor bracket bonding to glazed zirconia, a simple application of silane to the cleaned surface is recommended. A zirconia primer should be used only when the zirconia substructure is definitely exposed.

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Section: Discussionmentioning

confidence: 55%

Section: Discussionmentioning

confidence: 99%

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Orthodontic bracket bonding to glazed full-contour zirconia

et al. 2016

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“…Therefore, this method may be able to simulate the clinical setting [3]. However, Mojtahedzadeh et al [21] showed that the wire loop method resulted in less dispersed SBS data. Since cyclic loading is similar to the blade technique, this method was used in our study.…”

Section: Discussionmentioning

confidence: 99%

Effect of Cyclic Loading on Shear Bond Strength of Orthodontic Brackets: An In Vitro Study

Imani

Aghajani

Momeni

et al. 2019

JDT

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Objectives: In clinical conditions, orthodontic brackets are exposed to periodic stresses mainly induced by mastication and intraoral forces. The objective of the present study was to evaluate the effects of cyclic loading to simulate masticatory forces on shear bond strength (SBS) of metal brackets bonded to teeth using self-etch and total-etch bonding systems. Materials and Methods: Eighty-four caries- and crack-free bovine mandibular incisors were selected and randomly assigned to two groups based on the type of bonding system. After bonding, all samples were thermocycled (500 cycles) followed by cyclic loading of the half of the specimens in each group by applying 40 N load with 2 Hz frequency for 10,000 cycles. The SBS was measured using a universal testing machine. The adhesive remnant index (ARI) score was calculated subsequently. Data were analyzed using Kolmogorov-Smirnov test, two-way ANOVA and Mann-Whitney test. Results: The SBS was 10.09±3.78 MPa and 14.44±6.06 MPa for self-etch and total-etch bonding systems in cyclic loading group, respectively. The SBS was 9.43±5.3 MPa and 11.31±5.42 MPa in self-etch and total-etch groups without cyclic loading, respectively. Cyclic loading did not cause any significant difference in SBS (P>0.05). The ARI scores of the groups were significantly different (P<0.05). Conclusions: The present results demonstrated that low masticatory forces at 10,000 cycles did not have a significant impact on bracket-adhesive SBS; however, they significantly changed the ARI score. Even though the total-etch bonding system yielded higher SBS than the self-etch system, the performance of both was clinically acceptable.

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“…The shear bond testing was with the help of a loop wire because Mojtahedzadeh et al [24] in their study mentioned that the loop wire method has more similarity to clinical loads and lower dispersion of values than the blade method, for debonding of brackets in a shear mode.…”

Section: Discussionmentioning

confidence: 99%

Effect of remineralizing agents on bond strength of orthodontic brackets: an in vitro study

Ladhe¹,

Sastri²,

Madaan³

et al. 2014

Prog Orthod.

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BackgroundThe purpose of this study is to evaluate the effect of casein phosphopeptide amorphous calcium phosphate (CPP-ACP) and CPP-ACP with fluoride (CPP-ACP-F) on the shear bond strength (SBS) of orthodontic brackets bonded with two different adhesive systems.MethodsOne hundred twenty-six human premolar teeth were selected. One hundred twenty teeth were used for SBS testing, and six teeth were used for scanning electron microscope (SEM) examination. One hundred twenty premolars were divided into mainly three groups: CPP-ACP (group A), CPP-ACP-F (group B), and control group (group C). Each group was sub-divided into two groups according to the bonding adhesive, light cure (groups A1, B1, and C1) and chemical cure (groups A2, B2, and C2). The teeth were pre-treated with the group-specified preventive agent 1 h/day for five consecutive days. Standard edgewise brackets were bonded with the respective adhesives. SBS evaluation was done with the universal testing machine. After debonding, all the teeth were scored for adhesive remaining on the buccal surface, in accordance to adhesive remnant index, under a stereomicroscope. The acid-etched enamel surfaces were observed under SEM after treatment with CPP-ACP, CPP-ACP-F, and artificial saliva.ResultIn light-cure adhesive group, CPP-ACP-F (B1) showed superior results compared to the control group (C1), whereas the CPP-ACP group (A1) showed lower mean SBS than the control group (C1). Both these differences were not statistically significant (p > 0.05). In chemical-cure adhesive group, control group C2 showed significantly superior results (p < 0.05) compared to group A2 and group B2. The results of two-way ANOVA showed highly significant difference due to adhesive types (p < 0.01), whereas enamel pre-treatment showed non-significant difference (p > 0.01).ConclusionThe SBS of the orthodontic brackets was non-significantly affected when the brackets were cured with light-cure bonding system and treated with either CPP-ACP or CPP-ACP-F, whereas with chemical-cure adhesive, decreased bond strength was seen, which was within the clinically acceptable limits.

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Comparison of wire loop and shear blade as the 2 most common methods for testing orthodontic shear bond strength

Cited by 15 publications

References 11 publications

Orthodontic bracket bonding to glazed full-contour zirconia

Orthodontic bracket bonding to glazed full-contour zirconia

Effect of Cyclic Loading on Shear Bond Strength of Orthodontic Brackets: An In Vitro Study

Effect of remineralizing agents on bond strength of orthodontic brackets: an in vitro study

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