Effects of at-home and in-office bleaching and three composite types (hybrid, microhybrid, and nanofilled) on repair shear bond strength of aged composites

Zakavi, Faramarz; Johar, Najmeh; Moalemnia, Mina; Rakhshan, Vahid

doi:10.4103/1735-3327.324020

Cited by 4 publications

(2 citation statements)

References 54 publications

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“…A significant reduction in the bond strength of freshly added composite to the bleached one was noticed in this study between the 3 tested groups and the control one. This result was in covenant with Zakavi et al [20] who concluded that a major reduction of the bond strength occurred between the bleached composite and the freshly added one upon using of a nanofilled type while an acceptable bond strength was noticed upon using hybrid and microhybrid composite resin.…”

Section: Discussionsupporting

confidence: 78%

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The shear bond strength of freshly added composite resin to a repaired chemically bleached composite.

El.Sayed

2024

Egyptian Dental Journal

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Objective: This in-vitro study was done to evaluate the shear bond strength (SBS) of a repaired chemically bleached composite using a freshly added composite material. Materials and Methods:Forty composite disk specimens were prepared using a (8X3mm) Teflon mold. All specimens were immersed in saline solution for 2 months. Afterwards, the specimens were equally divided into four groups (10 each) depending on the instance of new composite addition. A Teflon mold (5X3mm) was used for adding the new composite disk by packing of the new composite to the previously cured disk. Group A (the control group) new composite was added to non-bleached composite samples. While group B fresh composite was added immediately after bleaching, group C it was added 1 week after bleaching, and group D it was added 2 weeks after bleaching. Bleaching was done utilizing chemical bleaching technique. The SBS between the two composite disks was measured using Instron universal testing machine.Results: A highly statistically significant difference was revealed by using of ANOVA test between the four groups (p<0.001), with the highest mean shear stress values noted in group A followed by D then group C, while the lowest recorded in group B. A High statistically significant difference between group B vs. A and D (p<0.001*) was shown by using of Pairwise Posthok test, denoting the lower shear bond stress values of group B versus both these groups. Furthermore, a significant statistical difference was noted between groups A & B versus C. While, non-significant differences were recorded between groups A&C versus group D. Conclusions:Teeth bleaching significantly decreases SBS in composite repair procedures, despite using ethanol based adhesives. In addition, postponing the composite repair after bleaching procedure has a major role in regaining the desired SBS.

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Section: Discussionsupporting

confidence: 78%

“…These results may be referred to the using of certain whiting material and also the different method of bleaching. Zakavi et al [20] described that no major disturb of the bond strength between freshly added composite to a bleached preexisted composite.…”

Section: Discussionmentioning

confidence: 99%

The shear bond strength of freshly added composite resin to a repaired chemically bleached composite.

El.Sayed

2024

Egyptian Dental Journal

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Effect of at‐home bleaching gels with different thickeners on the physical properties of a composite resin without bisphenol A

Vieira

Ferraz

Vieira-Júnior

et al. 2022

J Esthet Restor Dent

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Objective: To investigate, in vitro, the influence of at-home bleaching with 16% carbamide peroxide (CP) gels containing different thickeners on the color, gloss, roughness, and microhardness of a composite resin with bisphenol A (BPA) and without bisphenol A (BPA-free).Material and methods: Cylindrical samples (7 Â 2 mm) of a composite resin with BPA (Filtek Z350 XT ® ; 3M/ESPE) and composite resin BPA-free (Vittra APS ® ; FGM) were subdivided into six subgroups (n = 12), according to the bleaching gel used: no bleaching (control), commercial gel with 16% CP and carbopol, experimental gel with 16% CP and carbopol, experimental gel with 16% CP and natrosol, experimental gel with carbopol and experimental gel with natrosol. At the end of the experimental phase, the specimens were analyzed for color (ΔE* ab and ΔE 00 ), surface roughness (Ra), gloss (GU), and surface microhardness (SMH). The data for all analyzes were submitted to Levene's test, Shapiro-Wilk's test and ANOVA.Results: For ΔE* ab and ΔE 00 no statistically significant differences were found between all groups evaluated. Bleaching with experimental 16% CP gel with carbopol resulted in the lowest GU values for both composite resins evaluated. 16% CP experimental gel with natrosol resulted in higher Ra for the BPA composite resin and the bleaching with natrosol resulted in higher Ra for BPA-free. About 16% CP experimental gel with carbopol and 16% CP experimental gel with natrosol resulted in the lowest final SMH for composite resin with BPA. For the BPA-free composite resin, no differences were found between the groups in SMH for the same resin, however they presented the lowest values compared with all others groups. Conclusion:The effects on physical properties are dependent on the composition of the composite resin and the thickener/bleaching gel used. The BPA-free composite resin showed less changes after exposure to bleaching agent, although its initial physical properties were worse compared to a bleached BPA.Clinical Relevance: The hydrogen peroxide and thickener of the at-home bleaching gel does impact the properties of composites with BPA or BPA-free such as gloss,

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Comparative evaluation of microtensile bond strength in three different dentin luting agents: An in vitro study

Cayo-Rojas¹,

Castro-Ramirez²,

Ladera-Castañeda³

et al. 2022

JISPCD

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Aim: Long-term clinical success on indirect restorations is largely determined by bonding efficiency of the luting agent, with adhesion to dentin being the main challenge. Therefore, aim of this study was to assess the microtensile bond strength when using flowable resin composite, preheated resin composite and dual self-adhesive resin cement as dentin luting agents. Materials and Methods: Occlusal thirds of molar teeth were cut and randomly divided into 3 groups to be cemented: RelyX™U200, Filtek™ Z250 XT- preheated to 70° and Filtek Flow™ Z350XT. They were then thermocycled 5000 times between 5+/-2°C and 55+/-2°C. Subsequently, 10 microbars per group were prepared. The 30 samples were placed in saline solution for 24 hours at room temperature prior to microtensile test. This was performed with a digital universal testing machine at a crosshead speed of 0.5 mm/min. The bond strength values obtained were analyzed in Megapascals (MPa). Measures of central tendency such mean and measures of dispersion such standard deviation were used. In addition, the Kruskall Wallis non-parametric test with Bonferroni post hoc test was applied, considering a significance value of 5% (P < 0.05), with type I error. Results: The dentin microtensile bond strengths of preheated resin composite, flowable resin composite and dual self-adhesive cement were 6.08 ± 0.66 Mpa, 5.25 ± 2.60Mpa and 2.82 ± 1.26Mpa, respectively. In addition, the preheated resin composite exhibited significantly higher microtensile bond strength compared to the dual self-adhesive cement (P < 0.001). While the flowable resin composite showed no significant difference with the dual self-adhesive cement (P = 0.054) and the preheated resin composite (P = 0.329). Conclusions: The microtensile bond strength in dentin was significantly higher when using a preheated resin composite at 70°C as a luting agent compared to dual self-adhesive cement. However, the preheated resin composite showed similar microtensile bond strength compared to the flowable resin composite.

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Effects of at-home and in-office bleaching and three composite types (hybrid, microhybrid, and nanofilled) on repair shear bond strength of aged composites

Cited by 4 publications

References 54 publications

The shear bond strength of freshly added composite resin to a repaired chemically bleached composite.

The shear bond strength of freshly added composite resin to a repaired chemically bleached composite.

Effect of at‐home bleaching gels with different thickeners on the physical properties of a composite resin without bisphenol A

Comparative evaluation of microtensile bond strength in three different dentin luting agents: An in vitro study

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