<i>In vitro</i> flexural fatigue limits of dental composites

Braem, M; Davidson, C.L.; Lambrechts, Paul; Vanherle, Guido

doi:10.1002/jbm.820281203

Cited by 61 publications

(42 citation statements)

References 22 publications

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“…and a nanohybrid flow composite (GRAFL). Many studies have reported that flexural properties are positively correlated with the filler volume of resin composites, i.e., composites with a low filler content (%volume) have low FS (23)(24)(25)(26). However, Jiang et al found that composites with the same matrix and a different filler volume had similar FS (16).…”

Section: Discussionmentioning

confidence: 99%

Effects of critical thermal cycling on the flexural strength of resin composites

et al. 2015

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We compared flexural strength (FS) infour resin composites before and after three protocols for thermal cycling aging. Four resin composites were evaluated: Enamel Plus Hri, Gradia Direct Posterior, Grandioso, and Grandioso Flow. Sixty specimens (2 × 2 × 25 mm) were fabricated using a split metallic mold and light-cured for 30 s. The specimens were then randomly divided into four groups and tested using one of the following thermal cycling procedures: 1) storage in deionized water for 24 h (control group), 2) 15,000 cycles, 3) 30,000 cycles, and 4) 45,000 cycles. Each thermal cycling procedure was conducted between 5°C and 55°C, with a dwell time of 30 s. All specimens were subjected to a three-point bending test, to determine FS (0.5 mm/min). "Material" and "thermal aging" were significantly associated with FS (P < 0.001). A statistically significant interaction between the two factors was also detected (P < 0.001). In the non-aged groups, nanohybrid composites had the highest FS. FS significantly decreased after thermal cycling protocols in all composites tested.

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Section: Discussionmentioning

confidence: 99%

Effects of critical thermal cycling on the flexural strength of resin composites

et al. 2015

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“…Clamping the specimen and causing it to reverse (in displacement control), or stressing at a constant R, can compensate for specimen creep and change in compliance (Braem et al, 1994b). An additional advantage to displacement control testing of polymers is that the stress decreases continually, and therefore hysteretic heating does not take place (Hertzberg and Manson, 1980 (Cox, 1972), has been used for the characterization of and testing for differences among the lives in cyclic fatigue of various glass ionomers (Nakajima et al, 1996).…”

Section: Iia) Inorganic Glasses and Ceramicsmentioning

confidence: 99%

“…In an evaluation of composite restorative materials classified according to filler particle size, observation of the fracture surface revealed inter-and intra-particle fracture for the small particle and hybrid composites (Drummond, 1989 (Braem et al, 1994b). The relationship between storage time and decrease in strength is logarithmic (Yamamoto and Takahashi, 1995).…”

Section: (V) Applications Of Fatigue Data Analysis (Va) Life Predictionmentioning

confidence: 99%

Fatigue of Restorative Materials

Baran

Boberick

McCool

2001

Critical Reviews in Oral Biology & Medicine

137

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Failure due to fatigue manifests itself in dental prostheses and restorations as wear, fractured margins, delaminated coatings, and bulk fracture. Mechanisms responsible for fatigue-induced failure depend on material ductility: Brittle materials are susceptible to catastrophic failure, while ductile materials utilize their plasticity to reduce stress concentrations at the crack tip. Because of the expense associated with the replacement of failed restorations, there is a strong desire on the part of basic scientists and clinicians to evaluate the resistance of materials to fatigue in laboratory tests. Test variables include fatigue-loading mode and test environment, such as soaking in water. The outcome variable is typically fracture strength, and these data typically fit the Weibull distribution. Analysis of fatigue data permits predictive inferences to be made concerning the survival of structures fabricated from restorative materials under specified loading conditions. Although many dentalrestorative materials are routinely evaluated, only limited use has been made of fatigue data collected in vitro: Wear of materials and the survival of porcelain restorations has been modeled by both fracture mechanics and probabilistic approaches. A need still exists for a clinical failure database and for the development of valid test methods for the evaluation of composite materials.

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“…Microfill composites have been shown to have fracture resistance, stiffness, and fatigue strength lower than those of more heavily filled composites (Drummond, 1989;Willems et al, 1992;Braem et al, 1994a). Microfill composites generally show very low wear from abrasion by food.…”

Section: (A) Present Materialsmentioning

confidence: 99%

Current Trends in Dental Composites

Ferracane

1995

Critical Reviews in Oral Biology & Medicine

379

276

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ABSTRACT:The clinical performance of dental composites has been significantly improved over the past decade through modifications in formulation that include: using more stable polymerization promoters for greater color stability; incorporating high concentrations of finely ground fillers to produce adequate strength and excellent wear resistance while retaining translucency; adding radiopacifying agents for improved diagnostics; and utilizing dentin adhesives. However, there are problems which limit the use of composites, especially in posterior teeth. The materials remain very technique-sensitive, due to the extensive contraction which accompanies polymerization and negatively influences marginal sealing. In addition, the materials are generally considered to have inadequate mechanical properties and wear resistance in contact areas to serve as total replacements for amalgams. Current efforts are focusing on several areas, including the development of non-or minimallyshrinking dental composites containing spiro-orthocarbonates as additives to dimethacrylates or epoxy-base resins, and the production of alternative filler materials for ideal wear resistance and esthetics. This paper reviews the composition and characteristics of current dental composites, as well as recent areas of study.

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In vitro flexural fatigue limits of dental composites

Cited by 61 publications

References 22 publications

Effects of critical thermal cycling on the flexural strength of resin composites

Effects of critical thermal cycling on the flexural strength of resin composites

Fatigue of Restorative Materials

Current Trends in Dental Composites

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