The Influence of Surface Conditioning of Ceramic Restorations before Metal Bracket Bonding (original) (raw)
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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.
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.
Journal of Dental Sciences, 2020
Background/purpose: Increasing the bond strength between the orthodontic brackets and all-ceramic materials is one of the challenges facing orthodontists. The purpose of this study is to assess the shear bond strength (SBS) of metal brackets to two types of all ceramic materials using various surface mechanical and chemical conditioning methods. Materials and methods: Sixty ceramic blocks were prepared using two types of all ceramic materials (IPS e.max and VITA Suprinityâ PC) and treated with 3 surface treatments; surface etching with 9.6% hydrofluoric acid (HFA) for 2 mins; surface roughening with Sof-Lex finishing discs; and surface roughening with Sof-Lex finishing discs and etching with HFA. Metal brackets were attached to the surface of the ceramic blocks using light cure orthodontic adhesive. Samples were subjected to 2000 thermo-cycles (5e50 C) and the SBS was assessed using Instron machine. The adhesive remnant index (ARI) was evaluated under light microscope. Descriptive and group comparison were calculated using Two-way ANOVA, Post-hoc Tukey's and Chi-square tests and significance level set at (P < 0.05). Results: surface roughening of both ceramic materials with Sof-Lex discs and HFA resulted in a significant increase in SBS compared to other experimental groups (P < 0.05). However, VITA Suprinity ceramic prepared with Sof-Lex discs only showed the lowest SBS. The distribution of the ARI scores was significantly different between the groups (P < 0.05). Conclusion: Surface preparation of all ceramic materials with Sof-Lex discs and hydrofluoric
Australasian Medical Journal
Background Bonding to ceramic restorations remains a major challenge to orthodontists, especially due to an increasing number of adults seeking orthodontic treatment. Aims The objective of this research was to investigate the influence of two chemical methods used for surface conditioning of ceramic crowns, on shear bond strength (SBS) of metallic and ceramic orthodontic brackets bonded to ceramic surfaces. Methods The study was conducted on 48 prepared specimens of metallic and ceramic orthodontic brackets bonded to ceramic crowns, conditioned with two different etching materials: hydrofluoric acid (HFA), or phosphoric acid, and subsequently, silane. SBS was tested using Universal Testing Machine. The samples were analysed using Scanning Electron Microscope, to determine adhesive remnant index (ARI). Statistical data was processed with ANOVA, and ARI was evaluated using x 2 test, with level of significance α=0.05. Results SBS values of the groups etched with HFA and silane, compared to the groups etched with phosphoric acid and silane, are not significantly increased. However, ceramic brackets show significantly higher SBS values than metallic brackets. Conclusion Both types of ceramic surface conditioning procedures have similar features and provide strong enough SBS values to realize the orthodontic treatment. Also, the assumption that only the type of bracket significantly affects the SBS value can be accepted.
Evaluation of shear bond strength of different treatments of ceramic bracket surfaces
Dental Press Journal of Orthodontics, 2012
OBJECTIVE: To evaluate the bonding strength of the ceramic bracket and composite resin restoration interface, using four types of treatment on the base of the bracket. METHODOLOGY: 48 photoactivated composite resin discs were used (FiltekTM Z250) contained in specimens and divided into 4 groups of 12 specimens for each group according to the type of treatment performed on the base of the brackets. Once the brackets were bonded, the specimens were subjected to shear stress carried out in a universal testing machine (MTS: 810 Material Test System) calibrated with a fixed speed of 0.5 mm / minute. The values obtained were recorded and compared by means of appropriate statistical tests - analysis of variance and then Tukey's test. RESULTS AND CONCLUSIONS: The surfaces of ceramic brackets conditioned with 10% hydrofluoric acid for 1 minute, followed by aluminum oxide blasting, 50µ, after silane application and primer application, was considered the best method to prepare surfaces of ...
With the increase in adult orthodontic treatment comes the need to find a reliable method for bonding orthodontic brackets onto metal or ceramic crowns and fixed partial dentures. In this study, shear bond strength and surface roughness tests were used to examine the effect of 4 different surface conditioning methods: fine diamond bur, sandblasting, 5% hydrofluoric acid, and silica coating for bonding metal brackets to ceramic surfaces of feldspathic porcelain. Sandblasting and hydrofluoric acid were further tested after silane application. A total of 120 ceramic disc samples were produced, and 50 were used for surface roughness measurements. The glazed ceramic surfaces were used as controls. Metal brackets were bonded to the ceramic substrates with a self-curing composite. The samples were stored in 0.9% NaCl solution for 24 hours and then thermocycled (5000 times, 5°C to 55°C, 30 seconds). Shear bond tests were performed with a universal testing device, and the results were statistically analyzed. Chemical surface conditioning with either hydrofluoric acid (4.3 m) or silicatization (4.4 m) resulted in significantly lower surface roughness than mechanical conditioning (9.3 m, diamond bur; 9.7 m, sandblasting) (P Ͻ .001). The surface roughness values reflect the mean peak-and-valley distances. The bond strengths of the brackets bonded to the ceramic surfaces treated by hydrofluoric acid with and without silane (12.2 and 14.7 MPa, respectively), silicatization (14.9 MPa), and sandblasting with silane (15.8 MPa) were significantly higher (P Ͻ .001) than those treated by mechanical roughening with fine diamond burs (1.6 MPa) or sandblasting (2.8 MPa). The highest bond strength values were obtained with sandblasting and silicatization with silane or hydrofluoric acid without silane; these fulfilled the required threshold. The use of silane after hydrofluoric acid etching did not increase the bond strength. Diamond roughening and sandblasting showed the highest surface roughness; they can damage the ceramic surface. Acid etching gave acceptable results for clinical use, but the health risks should be considered. The silicatization technique has the potential to replace the other methods; yet cohesive failures were observed in the ceramic during removal of the brackets. (Am J Orthod
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 ...
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...