Evaluation of shear bond strength of different treatments of ceramic bracket surfaces (original) (raw)
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Shear bond strength of ceramic brackets after different pre-treatments in porcelain surface
DOAJ: Directory of Open Access Journals - DOAJ, 2015
Aim: To evaluate the bond strength of brackets bonded after different surface treatments on two dental ceramics. Methods: One hundred and twenty discs (5 mm thick and 7 mm diameter) of two ceramic types were made and randomly divided in 8 groups. Groups 1, 3, 5, and 7 used Eris ceramic and groups 2, 4, 6, and 8 used d.Sign ceramic. The ceramic surfaces were treated with 10% hydrofluoric acid (G1 and G2), 10% hydrofluoric acid + silane (G3 and G4), aluminum oxide blasting + 35% phosphoric acid + silane (G5 and G6), CoJet blasting + 35% phosphoric acid + silane (G7 and G8). Metallic brackets were cemented with Concise cement. Mechanical test was performed in a universal testing machine until failure. Results: The average values (MPa) obtained (G1-7.30; G2-6.12; G3-17.49; G4-19.54; G5-18.80; G6-21.93; G7-6.81 e G8-9.77) were submitted to ANOVA and Tukey test (p<0.05). The fracture patterns were analyzed in stereoscopic microscope (25´X) and representative samples of each group were analyzed in SEM. Conclusions: It was possible to conclude that use of silane after hydrofluoric acid increased the bond strength values.
Effect of different surface treatments on shear bond strength of ceramic brackets to old composite
2020
Background At present, the demand for orthodontic treatment is on the rise. On the other hand, evidence shows that the bond strength of composite resins to old composite restorations is often unreliable. Therefore, the aim of this in vitro study was to assess the effect of different surface treatments on shear bond strength (SBS) of ceramic brackets to old composite restorations. Methods In this in vitro experimental study, 60 nano-hybrid composite discs were fabricated. For aging, the discs were incubated in deionized water at 37 °C for 1 month. Next, they underwent 4 different surface treatments namely acid etching with 37% phosphoric acid, sandblasting, grinding, and Er,Cr:YSGG laser irradiation. Ceramic brackets were then bonded to the discs and underwent SBS testing. Results The maximum mean SBS value was obtained in the grinding group (9.16 ± 2.49 MPa), followed by the sandblasting (8.13 ± 2.58 MPa) and laser (6.57 ± 1.45 MPa) groups. The minimum mean SBS value was noted in th...
Impact of dIfferent surface treatments on surface roughness and shear bond strength of metal ceramIc crowns to ceramIc brackets ABSTRACT statement of problem: Bonding orthodontic brackets on teeth restored with fixed restorations such as crowns and bridges are a challenge for the orthodontist and prosthodontist. purpose: To evaluate the shear bond strength of ceramic brackets bonded to the metal ceramic crowns with 3 different surface treatments. materials and methods: A total of forty metalceramic crowns were constructed for maxillary first premolar and assigned for 4 equal groups of 10 specimens each relative to the surface treatment of their facial surfaces either, aluminum oxide abrasion, hydrofluoric acid etching, Cojet system abrasion, and the last group left without preparation acting as a control group. Each of the 30 treated specimens was treated with silane coupling agent before bonding it to the ceramic bracket with no mix orthodontic adhesive. Debonding was performed with a shear force on a universal testing machine. The mode of bond failure was determined macroscopically, and the integrity of the porcelain crowns was evaluated microscopically at 10X magnification. To evaluate the surface roughness produced relative to the different types of the surface treatment, 40 rectangular metal ceramic specimens classified into 4 groups as in metal ceramic crowns groups and their surface roughness were measured. The results of the shear bond strength and the surface roughness values were recorded and statistically analyzed. results: The results showed that, the method of porcelain conditioning technique affects the shear bond strength. Conditioning with Cojet system significantly increased the value of shear bond strength than hydrofluoric acid which in turn had significantly increased shear strength than aluminum oxide abrasion. Also surface roughness of the specimens treated chemico-mechanical was significantly higher than that treated chemically and mechanically conclusions: Within the limitations of this in vitro study, the following conclusions could be drawn: 1. All treated methods produced significant shear bond strength of the ceramic brackets to the tested ceramic surfaces than the control 2. The highest shear bond strength value was for Cojet system 3. At debonding, the adhesive resin mostly remained in the ceramic surface giving cohesive failure in all tested groups except the control one 4. The highest value of surface roughness was for cojet system, while the lowest value was for aluminum oxide abrasion system.
Effect of Ceramic Surface Treatment and Adhesive Systems on Bond Strength of Metallic Brackets
International Journal of Dentistry, 2020
Objective. This study evaluated the effect of ceramic surface treatments on bond strength of metal brackets to machinable ceramics and veneering porcelain using different adhesive resins. Materials and methods. Machined ceramic specimens (10 × 10 × 2 mm) were prepared from Vitablocs mark II (Vita) and IPS e.max® CAD (Ivoclar). Layered porcelain fused to metal (IPS d.Sign®, Ivoclar) was used to fabricate PFM specimens (n = 60/group). Half of specimens were etched (9.6% HF, 15 sec), and the rest were nonetched. Three resin bonding systems were used for attaching metal brackets (Victory series™ APC II, 3M) to each group (n = 10): Transbond™ XT (3M), Light Bond™ (Reliance), or Blugloo™ (Ormco), all cured with LED curing unit (Bluephase G1600, Vivadent) for 50 s each. Specimens were immersed in deionized water at 37°C for 24 hours prior to shear bond testing (Instron) at crosshead speed of 0.5 mm/min. Debond surface of ceramic and bracket base was examined for failure mode (FM), Ceramic ...
The Influence of Surface Conditioning of Ceramic Restorations before Metal Bracket Bonding
Materials Sciences and Applications, 2012
The aim of this study was to compare the shear bond strength and Adhesive Remnant Index of four different veneering ceramic materials to metal brackets. Additionally, it should be examined whether it is possible to overcome the etching method using hydrofluoric acid which is noxious. Instead of this treatment, air particle abrasion with 25 µm aluminium trioxide, silane coupling application and etching with 37.0 per cent orthophosphoric acid as pre-treatment procedures of the veneering ceramics before bonding was investigated. Two surface conditioning methods of four ceramic materials before bonding brackets were examined: in Group 1 an air particle abrasion with 25 µm aluminium trioxide (4 seconds at a pressure of 2.5 bars) and subsequently a silane coupling agent (Espe Sil, 3M Unitek, Monrovia, USA) was applicated on one side of each ceramic specimen (10 per group). In Group 2 one side of each sample (10 per group) was etched with 37.0 per cent orthophosphoric acid for two minutes and was followed by a silane application (Espe Sil, 3M Unitek, Monrovia, USA). After this procedure the self-ligating metal brackets SmartClip (3M Unitek, Monrovia, USA) brackets were bonded to the ceramic blocks and a thermocycling process started (5˚C-55˚C, 6000 cycles). Then, shear bond strength and Adhesive Remnant Index (ARI) were measured. To determine statistical differences Oneway-ANOVA and Tukey Post-hoc test were performed. The level of significance was set at α = 0.05. On the basis of the results of the current study, it could be concluded that sandblasting with 25 µm aluminium trioxide and the use of orthophosphoric acid (37.0 per cent) seem to prepare the surface of the ceramic restoration sufficiently before bracket bonding. The found level of shear bond strength values seem be sufficient for bracket bonding. Hydrofluoric acid seems not to be justifiable anymore for preparing the surface of dental ceramic restorations before bracket bonding.
Journal of dentistry (Tehran, Iran), 2011
The objective of this study was to compare the tensile bond strength of metal brackets bonding to glazed ceramic surfaces using three various surface treatments. Forty two glazed ceramic disks were assigned to three groups. In the first and second groups the specimens were etched with 9.5% hydrofluoric acid (HFA). Subsequently in first group, ceramic primer and adhesive were applied, but in second group a bonding agent alone was used. In third group, specimens were treated with 35% phosphoric acid followed by ceramic primer and adhesive application. Brackets were bonded with light cure composites. The specimens were stored in distilled water in the room temperature for 24 hours and thermocycled 500 times between 5°C and 55°C. The universal testing machine was used to test the tensile bond strength and the adhesive remenant index scores between three groups was evaluated. The data were subjected to one-way ANOVA, Tukey and Kruskal-Wallis tests respectively. The tensile bond strength ...