Effect of short-term water storage on the elastic properties of some dental restorative materials—A resonant ultrasound spectroscopy study

Pastila, Pirjo; Lassila, Lippo; Jokinen, Mikko; Vuorinen, Jyrki; Vallittu, Pekka K.; Mäntylä, T.

doi:10.1016/j.dental.2006.05.006

Cited by 27 publications

(19 citation statements)

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“…Nevertheless even the most recent composite resin products, due to their resin matrix's nature, still absorb more moisture than ceramics and are thus more prone to the penetration of various staining agents [4,5]. Unfortunately, only information furnished by manufacturers is available on the discoloration potential of composite resin materials so far and there is a lack of independent scientific data regarding their possible behavior in the clinical environment.…”

Section: Introductionmentioning

confidence: 99%

Color stability of recent composite resins

et al. 2016

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The objective of the study was to evaluate the color stability of 8 recently developed resin composites when exposed to various staining agents. Six disc-shaped specimens made out of 8 resin composite materials were immersed in artificial saliva, coffee, coke, tea, orange juice and red wine. The initial color (T0) of the 288 specimens was assessed by a calibrated reflectance spectrophotometer (SpectroShade, MHT) over a black as well as a white background. All specimens were kept in an incubator (INP-500, Memmert GmbH) at 37°C for 4 weeks. Colorant solutions were changed every 7 days to avoid bacteria or yeast contamination. After 4 weeks of storage in the colorants (T1), spectrophotometric measurements were repeated and DE00 was calculated. When analyzed over a white background, the mean DE00 values varied from 1.5 (Venus Diamond) to 52.4 (Miris 2). When analyzed over a black background, the mean DE00 values varied from 0.8 (Venus Diamond) to 40.0 (ELS). Significant differences were detected when comparing values at T0 and T1 (DE00) for both backgrounds (Anova and Fisher's LSD post hoc test). Resin composite materials do behave in a significantly different way (p value \ 0.01) when exposed to various staining solutions.

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Section: Introductionmentioning

confidence: 99%

Color stability of recent composite resins

et al. 2016

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“…In contrast, the authors did not observe a change in cyclic fatigue resistance within this period, indicating that the degradation due to water sorption was limited, or that the specimen was not totally saturated. In other, longer term, experiments in which full saturation of the entire polymer network with water or solvents occurred, the softening of the network, in conjunction with other long-term degradative effects, was shown to cause a reduction in the failure resistance of dental composites (Ravindranath et al, 2007), as evidenced by the polymer network becoming less rigid and more yielding to external loads (Pastila et al, 2007). While some plasticization of the network may help to provide an enhanced plastic zone ahead of crack tips for energy dissipation, the reduced properties of the compromised network facilitate the propagation of cracks at lower energies, negating any beneficial effects.…”

Section: Hydrolysis and Long-term Relaxationmentioning

confidence: 99%

Factors Involved in Mechanical Fatigue Degradation of Dental Resin Composites

2013

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The design of clinical trials allows for limited insights into the fatigue processes occurring in resin composites and the factors involved therein. In vitro studies, in contrast, can fundamentally narrow study interests to focus on particular degradation mechanisms and, to date, represent the major contributors to the state of knowledge on the subject. These studies show that microstructural features are important in determining strength and fracture toughness, whereas fatigue resistance is mainly related to the susceptibility of the matrix and the filler/matrix interface to mechanical and chemical degradation. In this review, we focus on fracture mechanisms occurring during fatigue, on the methods used to assess them, and on additional phenomena involved in the degradation of initial mechanical properties of resin composites.

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“…On the other hand, it can also be assumed that resin systems with a lower modulus of elasticity could provide good durability for the adhesive joints due to absorption of debonding stress to the elastic interphase layer. IPN polymer matrix of the FRC has a lower modulus of elasticity than polymer matrix of normal dimethacrylate filling composites …”

Section: Discussionmentioning

confidence: 99%