The effects of cyclic stress on dental polymethylmethacrylate

Hargreaves, A S

doi:10.1111/j.1365-2842.1983.tb00108.x

J of Oral Rehabilitation

1983

DOI: 10.1111/j.1365-2842.1983.tb00108.x

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The effects of cyclic stress on dental polymethylmethacrylate

A S Hargreaves

Abstract: Mechanisms of fatigue failure in polymers and the aims of fatigue testing have been examined, and factors affecting testing summarized. In the light of available work in several fields, parameters have been suggested for realistic flexural fatigue testing of denture base resins. A testing machine has been developed, with which the changes in properties of acrylic resin after fatigue in different environments can be studied. These changes developed gradually after 10(4) cycles and were related to the developmen… Show more

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Cited by 13 publications

References 21 publications

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In vitro flexural fatigue limits of dental composites

Braem

Davidson

Lambrechts

et al. 1994

J. Biomed. Mater. Res.

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The flexural fatigue test equipment developed was used to study the fatigue behavior of dental restorative composites, using a "staircase" approach. Three commercial composites were tested after dry and wet storage conditions. The findings indicate that the method is accurate and reliable, and that changes due to water sorption are clearly reflected: The flexural fatigue limit decreases after water sorption. From the present results it seems that under environmentally controlled conditions, the fatigue behavior is characterized by a well-defined fatigue stress level above which the composites tested fail rapidly, and below which they survive.

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In vitro flexural fatigue limits of dental composites

Braem

Davidson

Lambrechts

et al. 1994

J. Biomed. Mater. Res.

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Flexural fatigue behavior of machinable and light‐activated hybrid composites for esthetic restorations

Yoshida¹,

Morimoto²,

Tsuo³

et al. 2004

J Biomed Mater Res

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Abstract:The purpose of this study was to determine the flexural strength and flexural fatigue strength of a machinable composite (GN-I) and three hybrid composites (Artglass, Estenia, and Gradia). Specimens (2×2×25 mm) were polymerized in a laboratory-photo-curing unit and then immersed in water at 37°C for 24 h, 6 months, and 1 year. After each immersion period, flexural strengths (4-PFS) were measured at a cross-head speed of 1 mm/min in 4-point bending (span = 20 mm; distance between inside loading points = 10 mm).The cyclic fatigue test was performed at 2.0 Hz on a fatigue tester. The staircase method was employed for flexural fatigue strength (FFS) using a 5,000 cyclic load limitation, 5 MPa stress increment, and 20 specimens for each material. Both 4-PFS and FFS of the machinable composite after all immersion periods were significantly greater than those of the three hybrid composites. The FFS results followed the same pattern as those of the 4-PFS.The Estenia material exhibited the highest 4-PFS and FFS after 24-h-immersion among three hybrid composites, whereas after 1-year-immersion, all three composites showed almost identical 4-PFS and FFS statistically. A strong correlation was observed between 4-PFS and FFS of the machinable composite and three hybrid resin composites.

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Effects of simulated functional loading conditions on dentin, composite, and laminate structures

et al. 2008

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Use of composite restorations continues to increase, tempered by more potential problems when placed in posterior dentition. Thus, it is essential to understand how these materials function under stress-bearing clinical conditions. Since mastication is difficult to replicate in the laboratory, cyclic loading is frequently used within in vitro evaluations but often employs traditional fatigue testing, which typically does not simulate occlusal loading because higher stresses and loading frequencies are used, so failure mechanisms may be different. The present investigation utilized relevant parameters (specimen size; loading frequency) to assess the effects of cyclic loading on flexural mechanical properties and fracture morphology of (coronal) dentin, composite, and dentinadhesive-composite "laminate" structures.Incremental monitoring of flexural modulus on individual beams over 60,000 loading cycles revealed a gradual increase across materials; post-hoc comparisons indicated statistical significance only for 1 versus 60k cycles. Paired specimens were tested (one exposed to 60k loading cycles, one to static loading only), and comparisons of flexural modulus and strength showed statistically significantly higher values for cyclically-loaded specimens across materials, with no observable differences in fracture morphology. Localized reorganization of dentin collagen and polymer chains could have increased flexural modulus and strength during cyclic loading, which may have implications toward the life and failure mechanisms of clinical restorations and underlying tooth structure.

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The effects of cyclic stress on dental polymethylmethacrylate

Cited by 13 publications

References 21 publications

In vitro flexural fatigue limits of dental composites

In vitro flexural fatigue limits of dental composites

Flexural fatigue behavior of machinable and light‐activated hybrid composites for esthetic restorations

Effects of simulated functional loading conditions on dentin, composite, and laminate structures

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