Impact of photoinitiator quality on chemical-mechanical properties of dental adhesives under different light intensities

Silva, Tânia Mara da; Petrucelli, Nícolas de Faria; Mendonça, Rafael Pinto de; Júnior, Jefferson Pires da Silva; Campos, Tiago Moreira Bastos; Gonçalves, Sérgio Eduardo de Paiva

doi:10.4322/bds.2023.e3704

Cited by 2 publications

(2 citation statements)

References 26 publications

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“…Minerals are replaced by resin monomers that envelope the collagen fibrils forming after polymerization, the principal mechanism for dentinal adhesion, well-known as the hybrid layer, which is mainly responsible for stable long-term dentin bonding. 2 - 5 …”

Section: Introductionmentioning

confidence: 99%

“…The hybrid layer is obtained by partially or totally removing minerals with acidic primers in self-etch adhesives or acid etching in etch-and-rinse adhesive systems. 1 , 5 Recently, more versatile adhesives have been introduced, called universal adhesives, which can be adapted to both strategies. 6 The latter adhesive systems usually contain functional monomers which are capable of chemically interacting with hydroxyapatite, contributing to bond durability.…”

Section: Introductionmentioning

confidence: 99%

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Longitudinal bond strength of a universal adhesive and chemical dentin characterization under different acid etching protocols

GONÇALVES,

PRAKKI,

SILVA

et al. 2024

J. Appl. Oral Sci.

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Objective This study aimed to analyze the longitudinal bond strength of a universal adhesive and chemically characterize the dentin substrate under different acid etching protocols. Methodology Dentin samples were etched with polyacrylic acid 25% (PAA) for 10 seconds (n=3) and phosphoric acid 32% (PA) for 15 seconds (n=3) and analyzed by Fourier transform infrared spectroscopy – attenuated total reflectance (FTIR-ATR) before and after treatment. For collagen degradation, samples (n=12) were divided into 3 groups: PAA, PA, and Deionized water (control), and analyzed by the quantity of solubilized type I collagen C-terminal cross-linked telopeptides and solubilized C-terminal peptide in relation to total protein concentration (ICTPtp and CTXtp) and by their ultimate tensile strength (UTS). For the adhesive interface analysis, dentin samples (n=72) were divided into 3 groups: PAA, PA, and Self-etch (SE), and subdivided into 2 groups: 24 h (baseline) and 1 year. The following tests were performed: microtensile bond strength (μTBS) (n=48), scanning electron microscopy (SEM) (n=12), and nanoleakage (n=12). Results The FTIR of PAA showed lower reduction of the peaks in the phosphate group when compared to PA. For ICTPtp, PA showed a significantly higher value. For CTXtp, PA and PAA groups failed to statically differ from each other. UTS was significantly lower for PA. For μTBS, storage time significantly affected bond strength. The results were unaffected by the etching protocol. For SEM, after 1 year, PA had little evidence of degradation in the upper third of the adhesive interface in comparison to the other groups. Nanoleakage showed no considerable silver impregnation after 1 year in the SE group. Conclusion The use of PAA prior to a universal adhesive (when compared to PA) represents a less aggressive type of etching to dentin. However, self-etching still seems to be the best option for universal adhesive systems that have functional monomers in their composition.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Longitudinal bond strength of a universal adhesive and chemical dentin characterization under different acid etching protocols

GONÇALVES,

PRAKKI,

SILVA

et al. 2024

J. Appl. Oral Sci.

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Postoperative Sensitivity in Posterior Composite Resin Restorations

Santos Bispo,

De Castro Mudo,

Ferreira Pedrosa

et al. 2023

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Composite resin restorations are part of everyday clinical practice, delivering aesthetic and long-lasting results, provided there is mastery of the technique and knowledge of dental materials. Among the main failures in composite resin restorations is postoperative sensitivity, which causes discomfort for both the patient and the dentist due to the need to redo the procedure. The aim of this study is to demonstrate, through the literature, the possible origins of postoperative sensitivity and to describe more effective methods to minimize it. A literature review was conducted, with a temporal focus on the last 10 years (2013–2023), where articles published on the topic were searched in the PubMed, Scielo, Google Scholar, Scribd, and Lilacs databases. Postoperative sensitivity occurs due to the movement of existing dentinal fluids in the dentin, caused by inadequate sealing of dentinal tubules. Procedure failure is associated with factors such as restorative technique, adhesive system, monomer conversion rate, and polymerization time, which can lead to postoperative sensitivity. Thus, postoperative sensitivity can be triggered by various factors during the clinical procedure, requiring attention at every stage of the restorative technique by the dentist

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Impact of photoinitiator quality on chemical-mechanical properties of dental adhesives under different light intensities

Abstract: Impact of photoinitiator quality on chemical-mechanical properties of dental adhesives under different light intensitiesImpacto da qualidade de fotoiniciadores nas propriedades químico mecânicas de adesivos dentais sob diferentes intensidades de luz

Cited by 2 publications

References 26 publications

Longitudinal bond strength of a universal adhesive and chemical dentin characterization under different acid etching protocols

Longitudinal bond strength of a universal adhesive and chemical dentin characterization under different acid etching protocols

Postoperative Sensitivity in Posterior Composite Resin Restorations

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