The influence of shelf life and storage conditions on some properties of composite resins

Lange, C. De; Bausch, J. Robert; Davidson, C.L.

doi:10.1016/0022-3913(83)90276-7

Cited by 13 publications

(9 citation statements)

References 4 publications

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“…9 Studies involving expired resin composite performance reported various methodologies including flexure strength, 4,10 flexural modulus, 4,10 hardness, 9,11 diametral tensile strength, 12 surface roughness, 11 filler distribution, 13 thermal analysis, 10 infrared spectroscopy, 11 electron paramagnetic resonance (EPR) spectroscopy, 14 and X-ray diffraction. 14 Furthermore, accelerated and/or actual storage times differ, varying from 6 months ambient aging, 9,11 9 months simulated due to accelerated aging, 10,13,14 15 months, 12 and 7 years of ambient storage. 4 The purpose of this study was to investigate the postexpiration flexural strength and modulus of five, ambiently stored, visible light-cured direct restorative resin composites.…”

Section: Introductionmentioning

confidence: 99%

Flexural Performance of Direct Resin Composite Restorative Materials Past Expiration Date

2020

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Objective This study' s purpose was to examine the flexural properties of five direct restorative resin composites stored up to 30 months after the expiration date. Materials and Methods Ambient-stored materials had pre-expiration date baseline flexure strength values as per ISO 4049 (n = 20). All materials were used per manufacturer guidelines, photopolymerized on both sides using a LED-based visible light curing unit, and stored in 0.2M phosphate buffered saline. At 24 hours, specimens were stressed to failure in three-point bend at a 0.5 mm/min cross head speed. Additional samples were made at 3, 6, 9, 12, 15, 18, 24, and 30 months past expiration date. Young’s modulus (flexural) was ascertained using the linear slope of the stress-stain curve. Statistical Analysis The mean data was found to contain a non-normal distribution and irregular variance which was compared using Kruskal–Wallis with Dunn’s posthoc testing.Also, Pearson’s correlation analysis was used to identify possible similar degradation behavior between products within both flexure strength and modulus determinations. A 95% level of confidence (α = 0.05) was used. Results Materials maintained similar to baseline flexure strength and modulus for up to 15 months past expiration date with two materials being similar at 30 months. However, clinicians were still advised to follow expiration dates, as resin composite degradation mechanisms are complex and vital constituents might degrade that are not overtly identified by clinical handling characteristics. No dental shelf life standards exist and manufacturers are requested to provide protocol information used in determining shelf life expiration.

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Section: Introductionmentioning

confidence: 99%

Flexural Performance of Direct Resin Composite Restorative Materials Past Expiration Date

2020

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“…[ 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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“…Previously published investigations that assessed the performance and durability of two‐component composite resins unambiguously revealed a strong influence of storage temperature and storage time on the stability of mechanical properties. The findings of several independent studies therefore clearly recommended material storage in a refrigerator to prevent or delay premature aging 23,25,39,40 . Nevertheless, such recommendations seem to be less important today, and many manufacturers of two‐part paste systems like luting cements, core build‐ups and equally IRM permit the storage of their materials at room temperature (partly up to 28 °C) without explicitly stating the benefit of using a refrigerator.…”

Section: Discussionmentioning

confidence: 99%

Effect of Cartridge Storage Time and Ambient Laboratory Conditions on the Stability of Mechanical Properties of Bis‐Acryl Interim Resin Materials

Niem

Heun

Hübner

et al. 2021

Journal of Prosthodontics

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Purpose To investigate the stability of mechanical properties during the entire shelf life of chemically‐activated bis‐acryl interim resin materials stored at ambient laboratory conditions. Materials and methods Four bis‐acryl interim resin materials with no explicit recommendation for refrigerator storage were selected (Luxatemp Plus, Visalys Temp, Structur 3, Structur Premium). Following cartridge storage at ambient laboratory conditions in 6‐month intervals, 30 specimens (2.0 × 2.0 × 25.0 mm3) were prepared in each case and stored in distilled water (37.0 ± 1.0 °C) with 3 different water storage times (2 hours, 24 hours, 7 days). Flexural strength, modulus of elasticity, modulus of toughness, and elastic recovery were determined (3‐point bend test). Data were subjected to a three‐way multivariate analysis of variance (MANOVA) to determine overall significance, followed by a series of separate one‐way ANOVAs after data were split, using Tukey and Games‐Howell post hoc tests to identify significant differences between groups (α = 0.05). Results While Luxatemp Plus showed no significant decrease for all mechanical properties during the investigated shelf life of 21 months (p > 0.05), Visalys Temp exhibited a continuous decline of the corresponding values (p < 0.05), irrespective of the water storage time. Structur 3 and Structur Premium properties remained almost unchanged during the first 6 months of the examination period. Subsequently, a progressive decrease was observed for flexural strength and modulus of elasticity, while most modulus of toughness and elastic recovery results revealed little alteration. Conclusion Depending on the bis‐acryl interim resin material, mechanical properties appeared to be susceptible to continuous degradation processes during cartridge storage at ambient conditions, especially towards the end of the material shelf life. For some materials, the chemical stabilization and recommended storage conditions should be revised by the manufacturers to prevent premature aging during shelf life.

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The influence of shelf life and storage conditions on some properties of composite resins

Cited by 13 publications

References 4 publications

Flexural Performance of Direct Resin Composite Restorative Materials Past Expiration Date

Flexural Performance of Direct Resin Composite Restorative Materials Past Expiration Date

The effect of expiration date on mechanical properties of resin composites

Effect of Cartridge Storage Time and Ambient Laboratory Conditions on the Stability of Mechanical Properties of Bis‐Acryl Interim Resin Materials

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