Polymerization kinetics and polymerization stress in resin composites after accelerated aging as a function of the expiration date

D’Alpino, Paulo Henrique Perlatti; Svizero, Nádia da Rocha; Arrais, César Augusto Galvão; Alonso, Roberta Caroline Bruschi; Graeff, Carlos Frederico de Oliveira

doi:10.1016/j.jmbbm.2015.05.016

Cited by 7 publications

(6 citation statements)

References 33 publications

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“…To decide if a RC product has a shelf stability and grant an expiration date, a variety of characteristics should be evaluated. As a result, the substance must be examined to see if it is vulnerable to deterioration that will result in functional failure, as well as the amount of danger that such a failure would pose [ 16 ]. Dental practitioners are unaware of the risks of using RCs after their expiration dates.…”

Section: Introductionmentioning

confidence: 99%

Effect of Accelerated Aging on Some Mechanical Properties and Wear of Different Commercial Dental Resin Composites

et al. 2021

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The aim of current in vitro research was to determine the effect of hydrothermal accelerated aging on the mechanical properties and wear of different commercial dental resin composites (RCs). In addition, the effect of expiration date of the composite prior its use was also evaluated. Five commercially available RCs were studied: Conventional RCs (Filtek Supreme XTE, G-aenial Posterior, Denfil, and >3y expired Supreme XTE), bulk-fill RC (Filtek Bulk Fill), and short fiber-reinforced RC (everX Posterior). Three-point flexural test was used for determination of ultimate flexural strength (n = 8). A vickers indenter was used for testing surface microhardness. A wear test was conducted with 15,000 chewing cycles using a dual-axis chewing simulator. Wear pattern was analyzed by a three-dimensional (3D) noncontact optical profilometer. Degree of C=C bond conversion of monomers was determined by FTIR-spectrometry. The specimens were either dry stored for 48 h (37 °C) or boiled (100 °C) for 16 h before testing. Scanning electron microscopy (SEM) was used to evaluate the microstructure of each material. Data were analyzed using ANOVA (p = 0.05). Hydrothermal aging had no significant effects on the surface wear and microhardness of tested RCs (p > 0.05). While flexural strength significantly decreased after aging (p < 0.05), except for G-aenial Posterior, which showed no differences. The lowest average wear depth was found for Filtek Bulk Fill (29 µm) (p < 0.05), while everX Posterior and Denfil showed the highest wear depth values (40, 39 µm) in both conditions. Passing the expiration date for 40 months did not affect the flexural strength and wear of tested RC. SEM demonstrated a significant number of small pits on Denfil’s surface after aging. It was concluded that the effect of accelerated aging may have caused certain weakening of the RC of some brands, whereas no effect was found with one brand of RC. Thus, the accelerated aging appeared to be more dependent on material and tested material property.

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Section: Introductionmentioning

confidence: 99%

Effect of Accelerated Aging on Some Mechanical Properties and Wear of Different Commercial Dental Resin Composites

et al. 2021

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“…Compared to light-cured composites, chemically-cured composites seem to be more affected by the storage conditions. [ 6 7 ] Several studies concerning the storage stability of restorative dental biomaterials have been reported. [ 8 9 10 11 12 13 ]…”

Section: Introductionmentioning

confidence: 99%

The effect of expiration date on mechanical properties of resin composites

Sabbagh

Nabbout

Jabbour

et al. 2018

J Int Soc Prevent Communit Dent

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Objective:The aim of this in vitro study is to evaluate the effect of expiration date on some mechanical properties of resin composites after controlled storage of syringes and compules in a refrigerator at 4°C.Materials and Methods:Specimens were tested at 7 days after storage in distilled water at room temperature. The investigated properties are the static modulus of elasticity, the flexural strength, and the Vickers microhardness. Same batches of restorative materials were examined at baseline (at least 1 year before their expiration date) and 1 year after they expired.Results:Paired t-test is used to compare the results between the two groups using StatView software (version 5.0) SAS Campus Drive Cary, North Carolina, USA. Except for the flexural strength, no statistical differences were found between the mechanical properties of the expired and the unexpired group.Conclusion:The 1-year expiry date did not seem to affect the investigated mechanical properties.

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“…Other studies have shown that Maxcem Elite does not have a relevant acid-base reaction while setting, as do other selfadhesive cements, maintaining a low pH for a long time, which could adversely influence the formation of an optimal cross-linked polymer network [9]. D' Alpino et al [26] found a linear correlation between shrinkage strain rate and the filler volume. With increasing filler-volume percent, the shrinkage strain decreased [27].…”

Section: Discussionmentioning

confidence: 99%

Strain determination of self-adhesive resin cement using 3D digital image correlation method

et al. 2018

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Introduction/ObjectiveIn an attempt to simplify dental procedures, a new group of resin cements, self-adhesive resin cements (SARCs), have been introduced. Performance of SARCs can widely vary. One of the main reasons of adhesion failure is polymerization shrinkage. The aim of this study was to determine, evaluate, and measure strain field of self-adhesive dual cure resin cement during polymerization in self-cure mode using 3D digital image correlation (DIC) method. Methods The self-adhesive Maxcem Elite (Kerr, Orange, CA, USA) cement was tested in five cylindrical samples (5 mm in diameter and 2 mm in thickness) prepared by filling plastic ring-type molds. Digital images were recorded immediately after sample preparation. Results Non-uniform strain distribution was found in resin cement with higher strain values along the periphery (up to 15%) and lower strain values in central parts (around 4%) of each sample. Conclusion It can be concluded that DIC is a powerful tool for full-field strain measurements in material characterization.

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Polymerization kinetics and polymerization stress in resin composites after accelerated aging as a function of the expiration date

Cited by 7 publications

References 33 publications

Effect of Accelerated Aging on Some Mechanical Properties and Wear of Different Commercial Dental Resin Composites

Effect of Accelerated Aging on Some Mechanical Properties and Wear of Different Commercial Dental Resin Composites

The effect of expiration date on mechanical properties of resin composites

Strain determination of self-adhesive resin cement using 3D digital image correlation method

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