Effect of Er: YAG Laser on Microtensile Bond Strength of Bleached Dentin to Composite

Rezaei, Mohsen; Aliasghar, Elham; Rezvani, M.; Chiniforush, Nasim; Moradi, Zohreh

doi:10.15171/jlms.2019.19

Cited by 11 publications

(7 citation statements)

References 37 publications

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“…Although application of SA showed an increase in bond strength compared with the bleached surface, its value was significantly lower than that of the non-bleached surface. This result is in agreement with previous studies (Sasaki et al;Nascimento et al, 2019;Zhang et al, 2020), and the primary theory that justifies this finding is that SA can react with hydroxyl crystals or peroxiapatite resulting from bleaching (Briso et al, 2014;Rezaei et al, 2019). Thus, application of 10 % SA gel for 10 min can increase the bond strength to the bleached tooth structure.…”

Section: Discussionsupporting

confidence: 92%

Effect of Sodium Ascorbate or Alpha-Tocopherol on the Resin-Dentin Interface and Bond Strength after Endodontic Treatment and Bleaching

Silva

Jordão-Basso

Alencar

et al. 2021

Int. J. Odontostomat.

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The objective of this in vitro study was to assess the effects of two antioxidants (sodium ascorbate [SA] and alpha-tocopherol [AT]) on the adhesive interface and dentin bond strength immediately after bleaching with 38 % hydrogen peroxide (38HP) in endodontically-treated teeth. Two stages of experimentation were carried out. Bovine incisors were allocated into four groups (n = 10/group for each experiment): NB, non-bleached restored crowns; 38HP, bleached and immediately restored crowns; 38HP-SA, bleached crowns and SA use; and 38HP-AT, bleached crowns and AT use. Hybrid layer length in dentin (µm) and bond strength (MPa) were assessed with confocal microscopy laser and micro-shear bond strength (µSBS) test, respectively. Failure mode was determined by stereomicroscope. Data analysis was performed with analysis of variance (ANOVA) and Kruskal-Wallis, Dunn, Tukey, and Fisher-exact tests (a = 0.05). Higher values of hybrid layer length were observed similarly in the NB and 38HP-SA groups. The highest µSBS mean values were observed in the NB group (18.51 ± 1.33), whereas the SBS values for 38HP-AT (1.68 ± 0.32) were similar to the 38HP group (1.61 ± 0.51) (p > 0.05) and significantly lower than the 38HP-SA group (5.78 ± 0.71). Adhesive failures were predominant in the 38HP and 38HP-AT groups. Cohesive and mixed failures were mostly observed in the NB and 38HP-SA groups, respectively. In conclusion, AT has no immediate effect on the hybrid layer formation and µSBS of dentin. Although SA promotes an increase in hybrid layer formation, it was not reflected in the µSBS values.

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Section: Discussionsupporting

confidence: 92%

Effect of Sodium Ascorbate or Alpha-Tocopherol on the Resin-Dentin Interface and Bond Strength after Endodontic Treatment and Bleaching

Silva

Jordão-Basso

Alencar

et al. 2021

Int. J. Odontostomat.

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“…In another study, HP 35% and CP increased enamel roughness and showed deleterious effects on the enamel micromorphology [4,30]. The use of an oxidizing agent to remove enamel and dentin pigments is the basis of bleaching techniques [31]. The bleaching process, regardless of the use or non-use of light, leads to significant changes in the chemical composition of enamel and dentin.…”

Section: Discussionmentioning

confidence: 99%

The effect of laser-activated bleaching with 810 nm and 980 nm diode lasers on enamel micro-hardness; an in vitro study

Saati¹,

Orumchi²,

Namdar³

et al. 2020

Laser Phys.

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The aim of this study was to assess the micro-hardness of treated enamel with 810 nm and 980 nm diode lasers and to compare it with a conventional bleaching process.A sample of 45 caries-free human premolar teeth were selected. The enamel surfaces were completely polished. The crown portion of each tooth was then sectioned with a diamond disk, at dimensions of 3 × 3 × 3 mm. These sections were embedded in acrylic resin. The initial micro-hardness was determined by Vickers hardness apparatus at a vertical load of 200 g for 15 s. The samples were then randomly assigned to three groups of 15 samples.-Study group 1 (SG1): bleaching with Heydent JW gel and an 810 nm diode.-Study group 2 (SG2): bleaching with Heydent JW gel and a 980 nm diode.-Control group (CG): bleaching with Opalescense Boost.After bleaching, the Vickers micro-hardness was again evaluated. An analysis of covariance (ANCOVA) was used to compare the micro-hardness between the groups after bleaching, considering the initial micro-hardness as a covariate. A paired samples t-test was also used to compare micro-hardness before and after bleaching in each group and between groups.There was a significant difference in micro-hardness after bleaching with a laser and without a laser. After bleaching, the Vickers micro-hardness in the CG was significantly higher than in SG1 and SG2. There was no significant difference between SG1 and SG2 after bleaching (p value > 0.05).According to this study, laser irradiation with 810 nm and 980 nm diode lasers during tooth bleaching could cause a significant decrease in enamel micro-hardness.

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“…The force load and range of motion were 50 N and 0.8 mm respectively [ 22 ]. In the chewing simulator, the specimens were immersed in artificial saliva with a composition of 1.5 mmol/L Ca 2+ , 50 mmol/L KCl, 0.9 mmol/L PO 4 3− , and 20 mmol/L trihydroxy methyl aminomethane, at a pH of 7 [ 23 ].…”

Section: Methodsmentioning

confidence: 99%

In vitro attrition wear resistance of four types of paste-like bulk-fill composite resins

et al. 2022

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Background Recently, the application of bulk-fill composite resins has increased significantly. Attrition wear and the consequently increased surface roughness of composite resins are among the causes of restoration failure in the posterior teeth. This study aimed to compare the attrition wear and surface roughness of four types of bulk-fill composite resins compared to a conventional composite resin. Methods EverX-Posterior, X-tra fil, SonicFill 2, and Filtek Bulk-Fill composites (bulk-fill) and Z250 composite (conventional resin composite) were evaluated. Thirty cylindrical specimens (n = 6) were weighed and monitored for 24 h until their weight was stabilized. The primary surface roughness of the specimens was measured by a profilometer. The specimens were then subjected to attrition wear in a chewing simulator. Next, the specimens were weighed, and the surface roughness was measured again. Data were analyzed by one-way ANOVA and Tukey’s post-hoc test at P < 0.05 significance level. Results According to one-way ANOVA, the difference in weight loss was significant among the groups (P = 0.004) but the difference in surface roughness of the groups was not significant after the attrition wear (P > 0.05). Tukey’s post-hoc test showed that the weight loss of bulk-fill composites was not significantly different from that of Z250 conventional composite after the attrition wear (P > 0.05). Conclusion Within the limitations of this study, it appears that the tested bulk-fill composite resins are comparable to the conventional composite regarding their attrition wear, increased surface roughness, and weight loss.

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Effect of Er: YAG Laser on Microtensile Bond Strength of Bleached Dentin to Composite

Cited by 11 publications

References 37 publications

Effect of Sodium Ascorbate or Alpha-Tocopherol on the Resin-Dentin Interface and Bond Strength after Endodontic Treatment and Bleaching

Effect of Sodium Ascorbate or Alpha-Tocopherol on the Resin-Dentin Interface and Bond Strength after Endodontic Treatment and Bleaching

The effect of laser-activated bleaching with 810 nm and 980 nm diode lasers on enamel micro-hardness; an in vitro study

In vitro attrition wear resistance of four types of paste-like bulk-fill composite resins

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