Shear bond strength and failure modes of composite to dentin under different light-curing conditions

Miljković, Milan; Dačić, Stefan; Mitić, Aleksandar; Petković, Dušan; Andjelkovic-Apostolovic, Marija

doi:10.1177/09673911221143203

Cited by 3 publications

(6 citation statements)

References 34 publications

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“…17 Miljkovic et al reported that a decrease in what was an initially high SBS was observed in certain adhesives, which is why thermocycling is important. 29 The finding was supported by a previous study that described reduced bond strengths after a thermocycling process of 5,000 cycles. 14 However, the results of the current study were different.…”

Section: Discussionsupporting

confidence: 74%

Hybrid Layer, Shear Bond Strength, and Fracture Patterns of Titanium Dioxide–Doped Phosphate Glass–Filled Universal Dental Adhesives

Husein,

Seoudi,

El-Damanhoury

et al. 2024

European Journal of General Dentistry

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Objectives The aim of the study was to explore the potential effects of incorporating 5 and 10 wt% of TiO2-doped phosphate glass powder as fillers into the universal adhesive system. Materials and Methods Human permanent premolars and molars were used in the study. Five and 10 wt% of TiO2-doped phosphate glass powder as fillers were added into the universal adhesive system. Unmodified universal adhesive was used as control. The effects of the added filler in the universal adhesive were examined on hybrid layer formation at the resin composite and dentine interface (mesio-occlusal-distal [MOD] cavities) under scanning electron microscope (SEM), shear bond strength (SBS) of resin composite to dentine using shear bond testing machine, and the patterns of fracture at the resin composite–dentin interface, which were examined under stereomicroscope. The SBS analyses were performed with (8 samples per group, n = 24) and without (8 samples per group, n = 24) 5,000 cycles of thermocycling. Statistical Analysis One-way analysis of variance (ANOVA) was used to analyze the data of the SBS. For bond strength, the effects of adding fillers into the universal adhesive were analyzed. Results The SEM images showed that the hybrid layers were similar in all the groups of unmodified and modified adhesives. An ANOVA test revealed that the SBSs of control and modified adhesives were not significantly different before (p = 0.15) or after (p = 0.39) thermocycling for all the groups. The patterns of fracture revealed various types of fracture in all adhesive groups including composite resin, adhesive, and dentine failure. Composite resin fractures are the most encountered pattern of fracture. Conclusion Adding 5 and 10 wt% of TiO2 into universal adhesive did not adversely affect the hybrid layer, SBS, or mode of failure of composite resin to dentine. The pattern of fracture at the resin composite and dentine interface showed a favorable bonding with more cohesive than adhesive failure, particularly with the 5 wt% glass-modified adhesive group.

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Section: Discussionsupporting

confidence: 74%

Hybrid Layer, Shear Bond Strength, and Fracture Patterns of Titanium Dioxide–Doped Phosphate Glass–Filled Universal Dental Adhesives

Husein,

Seoudi,

El-Damanhoury

et al. 2024

European Journal of General Dentistry

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“…16 Meanwhile, in group C (60 seconds of chlorhexidine) and group D (90 seconds of chlorhexidine), the most common failure was Mixed 2, which indicated a stronger bond than adhesive failure. 28 This matter was specified by a higher value of shear bond strength in group C and group D, compared to group A and group B. In this study, cohesive failure was not observed in any of the experimental groups.…”

mentioning

confidence: 52%

The Role of Duration of Chlorhexidine Gluconate 2% Application on the Shear Bond Strength of a Total Etch Bonding Agent: A Comparative Study

Fasya,

Yolanda,

Hayati

2023

CCIDE

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Introduction: Matrix metalloproteinases enzymes (MMPs) can degrade the hybrid layer which can cause failure of composite restorations. Chlorhexidine gluconate 2% can reduce MMPs activity and increase the bond strength of the resin to dentin. Purpose: This study aims to determine the role of the duration of chlorhexidine gluconate 2% application on shear bond strength of a total-etch bonding agent. Methods: A total of 36 freshly extracted maxillary premolars were removed occlusally by one-third of the crown using a carborundum disc until the dentin was exposed. Specimens were divided into four groups n(9). The dentin surfaces were etched for 5s. Group A is the control group. In group B, chlorhexidine gluconate 2% was applied for 30s. In group C, chlorhexidine gluconate 2% was applied for 60s. In group D, chlorhexidine gluconate 2% was applied for 90s. The universal adhesive was applied afterwards and then followed by composite to the dentin surface. All specimens were stored in artificial saliva at 37°C for 24 hours. The shear bond strength was tested using a universal testing machine. Results: There was an increase in the shear bond strength of the bonding agent along with the additional application duration of chlorhexidine gluconate 2%. All groups gave higher MPa values than the control group. The shear bond strength in group A (control) was 12.64 MPa; Group B (30s of chlorhexidine) was 16.93 MPa; Group C (60s chlorhexidine) was 18.23 MPa; group D (90s of chlorhexidine) was 18.47MPa. Conclusion: Duration of chlorhexidine gluconate 2% application affects the shear bond strength of the bonding agent with the totaletch system. The effective duration of chlorhexidine gluconate 2% for the restorative procedure is 60 seconds.

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“…However, if the bonding interface resists and remains intact, residual stress could be transferred to adjacent tooth structures, possibly resulting in fractures of the enamel or dentin. 40 However, in the samples of the Filtek One Bulk Fill resin composite, a better bond strength was observed with the monowave unit as opposed to the polywave unit with standard and extra power. This could be due to the fact that Filtek One Bulk Fill was the most filled material, containing 58.5% by volume.…”

Section: Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

“…8,21,27,35,39 There is controversy over high irradiance levels as they can produce greater polymerization contraction and internal stress within the bonding interface, but also low irradiance could cause insufficient polymerization of the composite resin, with high levels of residual monomer and this can reduce the mechanical properties of the final restoration, which is why new curing methods are being suggested. 24,40 The assumption that an increase in irradiance and a decrease in curing time would lead to poor mechanical properties 5,24 is not accurate because the properties of the resin composite after light curing depend not only on the curing protocols, but also on the intrinsic characteristics of the material, such as the type of monomer present in the organic matrix, photoinitiator, monomer viscosity, and mobility of the radicals. Therefore, such reasoning cannot be considered a general rule.…”

Section: Discussionmentioning

confidence: 99%

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Effect of Polywave and Monowave Light Curing Units on the Microtensile Bond Strength and Failure Types of Different Bulk-Fill Resin Composites: An in vitro Study

Castro-Ramirez,

Espinoza-Salcedo,

Huamani-Echaccaya

et al. 2024

CCIDE

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Aim This study aimed to evaluate the effects of polywave and monowave light-emitting diode curing units on the microtensile bond strength and failure types of three bulk-fill resin composites. Materials and Methods This in vitro experimental study was performed on 180 microbars obtained from human third molars and were distributed into 12 groups according to the type of bulk-fill resin composite and the light-curing unit. Third molars were restored using Filtek One Bulk Fill Restorative, Tetric ® N-Ceram Bulk Fill, and Opus Bulk Fill resin composites was light-cured with Elipar Deep Cure L and Valo in three modes: standard, high power, and extra power. Subsequently, microtensile analysis was carried out with a universal testing machine and the type of failure with an optical stereomicroscope. For statistical analysis, the Kruskal–Wallis H-test was used, with the Bonferroni post hoc test and Fisher’s exact test, considering a significance of p<0.05. Results There were significant differences in the microtensile bond strength between the Filtek One Bulk Fill restorative and Opus Bulk-Fill (p = 0.042) when light was cured with the polywave unit at standard power. On the other hand, the Filtek One Bulk Fill Restorative and Opus Bulk Fill resins showed significant differences in microtensile bond strength when light was cured with the monowave unit compared with the polywave unit (p<0.05). Conclusion The presence of alternative photoinitiator systems that are more reactive than camphorquinone produced higher microtensile bond strength in Tetric N-Ceram Bulk Fill and Opus Bulk Fill resins when light-cured with a high and standard polywave unit, respectively, compared to Filtek One Bulk Fill resins. Finally, Tetric N-Ceram Bulk Fill and Opus Bulk Fill resins had the highest percentage of mixed failures, while Filtek One Bulk Fill resin had adhesive failures, which was related to its lower microtensile bond strength.

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Shear bond strength and failure modes of composite to dentin under different light-curing conditions

Cited by 3 publications

References 34 publications

Hybrid Layer, Shear Bond Strength, and Fracture Patterns of Titanium Dioxide–Doped Phosphate Glass–Filled Universal Dental Adhesives

Hybrid Layer, Shear Bond Strength, and Fracture Patterns of Titanium Dioxide–Doped Phosphate Glass–Filled Universal Dental Adhesives

The Role of Duration of Chlorhexidine Gluconate 2% Application on the Shear Bond Strength of a Total Etch Bonding Agent: A Comparative Study

Effect of Polywave and Monowave Light Curing Units on the Microtensile Bond Strength and Failure Types of Different Bulk-Fill Resin Composites: An in vitro Study

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