Abstract:Debonding at the composite-adhesive interface is a major problem for indirect composite restorations. The aim of this study was to evaluate the bond strength (BS) of an indirect composite resin after various surface treatments (air-abrasion with Al2O3, phosphoric acid-etchig and different applications of NdYAG laser irradiations). Fifty composite disks were subjected to secondary curing to complete polymerization and randomly divided into five experimental groups (n = 10) including Group 1, untreated (control)… Show more
“…26 It increases surface energy, wettability, surface roughness and irregularities which may augment the interlocking between the resin cement and the ceramic. 27,28 In the current study, the µTBS of the sandblasting surface treatment group was lower than that of the hydrofluoric acid treatment group. The fractured surface of the SB specimen examined by SEM Aging protocol 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 Non-thermocycled 13 3 0 1 12 3 11 5 0 6 10 0 5 11 0 Thermocycled 15 1 0 2 13 1 9 7 0 6 10 0 1 also revealed a relatively homogenous surface not deeply dented ( Table 2, Figure 2C), which might explain the lower bond strength values compared with the HF group.…”
Please cite this article as follows: Motevasselian F, Amiri Z, Chiniforush N, Mirzaei M, Thompson V. In vitro evaluation of the effect of different surface treatments of a hybrid ceramic on the microtensile bond strength to a luting resin cement.
Abstract Introduction:The aim of the present study was to investigate the effect of different surface treatments of a hybrid ceramic, Vita Enamic, on the micro-tensile bond strength (µ-TBS) to resin cement. Methods: Ten blocks (3×10×8 mm) were retrieved from the original blocks and divided into 5 groups according to the different surface treatments performed: Groups 1: 35% acid phosphoric for 60 seconds (PA); group 2: Sandblasting with 50 µm Al 2 O 3 particles for 10 seconds (SB); groups 3: 9.5% hydrofluoric acid for 60 seconds (HF), group 4: The Er:YAG laser (2 W, 10 Hz) (ER1), group 5: The Er:YAG laser (3 W, 10 Hz) (ER2). All treated surfaces were salinized and the blocks with similar surface treatments were bonded together using a dual-cured resin cement and light-cured. After 24-hour storage in water, the blocks were cut into beams (1 mm 2 ). Half of the specimens in each group (n=16) were tested immediately and the rest were subjected to thermocycling between 5°C and 55°C for 6000 cycles before the µ-TBS test at a crosshead speed of 0.5 mm/min. The data were analyzed using two-way analysis of variance (ANOVA) and Tukey HSD tests and the significance level was set at 0.05. The failure mode was evaluated by using a stereomicroscope. Results: The µ-TBS was clearly influenced by surface treatment methods (P < 0.001) and thermocycling significantly decreased the bond strength values in all groups (P = 0.007). The highest value (66.07 MPa ± 11.3) was obtained for the HF groups with no thermocycling and the lowest values were observed in the laser groups with no significant difference among different irradiation parameters. Adhesive failure was mainly observed in the PA and SB groups while mixed failure was predominantly shown in the laser and HF groups. Conclusion: This study demonstrated that surface treatment of VE with HF and salinization could improve the bond strength to a dual-cured resin cement, and Er:YAG laser irradiation with the evaluated parameters did not promote the adhesion of the resin cement to VE.
“…26 It increases surface energy, wettability, surface roughness and irregularities which may augment the interlocking between the resin cement and the ceramic. 27,28 In the current study, the µTBS of the sandblasting surface treatment group was lower than that of the hydrofluoric acid treatment group. The fractured surface of the SB specimen examined by SEM Aging protocol 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 Non-thermocycled 13 3 0 1 12 3 11 5 0 6 10 0 5 11 0 Thermocycled 15 1 0 2 13 1 9 7 0 6 10 0 1 also revealed a relatively homogenous surface not deeply dented ( Table 2, Figure 2C), which might explain the lower bond strength values compared with the HF group.…”
Please cite this article as follows: Motevasselian F, Amiri Z, Chiniforush N, Mirzaei M, Thompson V. In vitro evaluation of the effect of different surface treatments of a hybrid ceramic on the microtensile bond strength to a luting resin cement.
Abstract Introduction:The aim of the present study was to investigate the effect of different surface treatments of a hybrid ceramic, Vita Enamic, on the micro-tensile bond strength (µ-TBS) to resin cement. Methods: Ten blocks (3×10×8 mm) were retrieved from the original blocks and divided into 5 groups according to the different surface treatments performed: Groups 1: 35% acid phosphoric for 60 seconds (PA); group 2: Sandblasting with 50 µm Al 2 O 3 particles for 10 seconds (SB); groups 3: 9.5% hydrofluoric acid for 60 seconds (HF), group 4: The Er:YAG laser (2 W, 10 Hz) (ER1), group 5: The Er:YAG laser (3 W, 10 Hz) (ER2). All treated surfaces were salinized and the blocks with similar surface treatments were bonded together using a dual-cured resin cement and light-cured. After 24-hour storage in water, the blocks were cut into beams (1 mm 2 ). Half of the specimens in each group (n=16) were tested immediately and the rest were subjected to thermocycling between 5°C and 55°C for 6000 cycles before the µ-TBS test at a crosshead speed of 0.5 mm/min. The data were analyzed using two-way analysis of variance (ANOVA) and Tukey HSD tests and the significance level was set at 0.05. The failure mode was evaluated by using a stereomicroscope. Results: The µ-TBS was clearly influenced by surface treatment methods (P < 0.001) and thermocycling significantly decreased the bond strength values in all groups (P = 0.007). The highest value (66.07 MPa ± 11.3) was obtained for the HF groups with no thermocycling and the lowest values were observed in the laser groups with no significant difference among different irradiation parameters. Adhesive failure was mainly observed in the PA and SB groups while mixed failure was predominantly shown in the laser and HF groups. Conclusion: This study demonstrated that surface treatment of VE with HF and salinization could improve the bond strength to a dual-cured resin cement, and Er:YAG laser irradiation with the evaluated parameters did not promote the adhesion of the resin cement to VE.
“…The critical point in indirect and semidirect restorations is the bond between the composite resin and the tooth structure. 26 Study results show that air abrasion with aluminum oxide particles can improve the bond strength of the resin cement to the restoration 25,26,34,35 by increasing the surface area and its wettability and by eliminating contaminated areas. However, the clinician should take care with the restoration finishing lines and avoid sandblasting them.…”
Section: Discussionmentioning
confidence: 95%
“…Indirect composite inlays, onlays, and overlays with the semidirect technique described can be a conservative, cost-effective, and less time-consuming alternative to indirect restorations. 26 This technique is indicated for patients who need proper large reconstructions in posterior teeth in a short time and at a lower cost. The technique described eliminates the laboratory phase of indirect restorations, offering patients a single visit to the dental office, with no need for temporary restorations and use of only a single administration of oral anesthetic.…”
Section: Discussionmentioning
confidence: 99%
“…One of the major problems regarding direct composite restorations might be shrinkage, 20 which produces stress at the tooth-restoration interface and can lead to microleakage, secondary caries, postoperative sensitivity, pulpal irritation, and marginal discoloration. 12,26,32 Also, physical and mechanical properties of composites are affected by the degree of conversion of their monomers. 13 A proper degree of conversion is clinically necessary once unreacted monomers and inadequate polymerization compromise the mechanical properties of composites, affecting their performance under masticatory loads, increasing wear, and decreasing restoration longevity.…”
Section: Discussionmentioning
confidence: 99%
“…After that, we sandblasted the inner surface of the restoration with 50-micrometer aluminum oxide particles for 10 seconds at a distance of 5 centimeters from surface to improve bonding to the resinous cement, taking care to avoid damaging the external margins. 25, 26 We rinsed the restorations with 95% alcohol and dried them with air spray.…”
Clinicians can restore large preparations in posterior teeth successfully with semidirect composite restorations in a single appointment by using the flexible die technique, resulting in satisfactory function and esthetic outcome.
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