Compressive Fatigue Limits of Composite Restorative Materials

Draughn, Robert A.

doi:10.1177/00220345790580031101

Cited by 150 publications

(113 citation statements)

References 6 publications

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“…The cyclic shear bond strength (CSBS) data were analyzed according to the design by Draughn. 16 Student's t-test was used to determine significance between the cyclic subgroups and between static and cyclic groups. A Kruskal-Wallis test was used in conjunction with a Mann-Whitney test to compare the differences in the ARI scores.…”

Section: Discussionmentioning

confidence: 99%

“…For accurate data analysis, a minimum of fifteen samples is required to perform the up and down test to evaluate the fatigue strength. 16 In the present study, the number of each sample group was 25. According to the procedure addressed by Draughn, 16 the data analysis was based on the event that occurred (bond failures, no bond failures) with the least frequency.…”

Section: The Cyclic Fatigue Testingmentioning

confidence: 96%

“…16 The initial load was approximately 60% of the mean static testing results of each group, and the test was run for 1000 cycles or until bond failure. If any bracket survived the 1000 cycles, then the load was raised by a fixed amount of 20 Newton (N) for the next tested sample.…”

Section: The Cyclic Fatigue Testingmentioning

confidence: 99%

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In vitro evaluation of self-etch bonding in orthodontics using cyclic fatigue

Mansour¹,

Drummond

Evans

et al. 2011

The Angle Orthodontist

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Objective: To evaluate the bond strength of a self-etch bonding system using static loading and cyclic fatigue with shear testing. This is a two-part evaluation; the first part will evaluate shear testing, the second part tensile testing. Materials and Methods: Bovine teeth (n 5 82) were randomly distributed to either a self-etch (Transbond Plus) or total-etch (37% phosphoric-acid + Transbond XT) group. The static shear (SSBS) and cyclic shear (CSBS) bond strengths were measured 24 hours after the bonding of mesh-based brackets. The adhesive remnant index (ARI) and failure sites were evaluated. Results: The mean SSBS was 34.25 6 9.21 and 24.64 6 9.42 MPa for the total-and self-etch groups, respectively. CSBS was 24.07 6 0.65 MPa and 18.92 6 1.08 MPa for the total-and selfetch groups, respectively. Cyclic loading produced lower bond strengths compared to static testing for both adhesives; the difference was only statistically significant for the total-etch system. Comparison of the two materials showed a statistically significant difference between the two techniques. The total-etch had higher bond strengths than the self-etch bonding system. The samples showed a predominance of ARI scored of 2 and 1, and their bonding failure sites were cohesive within the composite. Conclusion: Cyclic loading, simulating occlusal forces, reduces the bond strength of both bonding systems. Even though the self-etch bonding system had lower shear bond strength than the totaletch system, both were still clinically acceptable. (Angle Orthod. 2011;81:783-787.)

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Section: Discussionmentioning

confidence: 99%

Section: The Cyclic Fatigue Testingmentioning

confidence: 96%

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In vitro evaluation of self-etch bonding in orthodontics using cyclic fatigue

Mansour¹,

Drummond

Evans

et al. 2011

The Angle Orthodontist

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show abstract

“…Early fatigue tests focused almost exclusively on restorative materials such as amalgam and resin composites [49][50][51][52][53] . To determine the feasibility of a complex dental restoration, Huysmans et al 52) employed a fatigue testing machine (load cycling at 5 Hz frequency) to evaluate the mechanical fatigue behavior of premolar teeth restored with a titanium alloy post and an amalgam or composite core.…”

Section: Load Cycling Fatigue Test Of Prg Filler-filled Adhesivesmentioning

confidence: 99%

A Review of Chemical-approach and Ultramorphological Studies on the Development of Fluoride-releasing Dental Adhesives Comprising New Pre-Reacted Glass Ionomer (PRG) Fillers

et al. 2008

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This paper reviews our recent studies on fluoride-releasing adhesives and the related studies in this field based on information from original research papers, reviews, and patent literatures. A revolutionary PRG (pre-reacted glass ionomer) filler technology -where fillers were prepared by the acid-base reaction of a fluoroaluminosilicate glass with polyalkenoic acid in water, was newly developed, and a new category as "Giomer" was introduced into the market. On fluoride release capability, SIMS examination revealed in vitro fluoride ion uptake by dentin substrate from the PRG fillers in dental adhesive. On bonding durability, it was found that the improved durability of resin-dentin bonds might be achieved not only via the strengthened dentin due to fluoride ion uptake from the PRG-Ca fillers, but also due to retention of relatively insoluble 4-AETCa formed around remnant apatite crystallites within the hybrid layer in 4-AET-containing self-etching adhesives. On ultramorphological study of the resin-dentin interface, TEM images of the PRG-Ca fillers revealed that the dehydrated hydrogel was barely distinguishable from normal glass fillers, if not for the concurrent presence of remnant, incompletely reacted glass cores. In conclusion, it was expected that uptake of fluoride ions with cariostatic effect from PRG-Ca fillers would endow dentin substrates with the benefit of secondary caries prevention, together with an effective and durable adhesion to dentin. Key words: Pre-reacted glass ionomer (PRG) technology, Giomer, Fluoride-releasing adhesiveReceived May 30, 2007: Accepted Nov 2, 2007 In 1955, Dr. Michael Buonocore 1) first demonstrated the bonding of acrylic resin to etched enamel. This success has since opened a new vista in the field of adhesive dentistry, and so-called acid-etching technique is ubiquitous in today's dental clinics. The field of adhesive dentistry has made a significant progress over the past decade. A large part of this success is attributed to the major advances in a bonding technology 2) . On dental adhesives, most of the developed products are biologically evaluated by means of in vivo histopathological studies and clinical trial investigations. INTRODUCTIONResults obtained thus far, when measured against stringent clinical demands, point to the need for further research and improvement. The ultimate goal in the design and development of dental adhesives is to render a material that is relatively easy to apply, less technique-sensitive, and which inhibits the formation of secondary caries. To achieve these targets through the development of more advanced adhesives, numerous challenges have been continuously performed by rigorous chemical-approach studies with the aim of tackling research problems and speculations that are regularly encountered in the course of exploration and development. In addition, to understand the mechanism of adhesion to dental hard tissues or its degradation at the resin-dentin interface, numerous ultramorphological studies are undertaken, and made valuable ...

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“…Fatigue studies showed a correlation between the compressive strength and the fatigue limit, indicating that a composite with a high compressive strength will withstand fatigue better 20) . PM2 demonstrated higher compressive strength than PM0 in both DRY and WET groups.…”

Section: Discussionmentioning

confidence: 99%

Effect of PMMA filler particles addition on the physical properties of resin composite

et al. 2010

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The aim of this study was to evaluate the effect of additional polymethyl methacrylate (PMMA) fillers on the physical properties of experimental resin composites. PMMA particles (d=30 µm) were added to an experimental methacrylate-based resin composite in five concentrations of 0, 2.0, 4.8, 9.1, and 23.1 wt%. Properties such as contact angle, water sorption and compressive strength were measured and the fractured specimens were observed with a scanning electron microscope. The results showed that a small amount (2 wt%) of additional PMMA fillers inhibited the crack propagation and enhanced compressive strengths of the resin composites, without a significant change in water contact angle of surface or increased water sorption. However, in higher portions, the mechanical properties were not improved as a debonding at the interface between untreated fillers and the matrix, or failure within the organic filler could reduce the compressive yield strength of the composite.

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Compressive Fatigue Limits of Composite Restorative Materials

Abstract: Compressive fatigue limits at 5,000 stress cycles have been measured for seven commercial composite restorative materials. The average of the ratios between fatigue limit and compressive strengths is 0.64.

Cited by 150 publications

References 6 publications

In vitro evaluation of self-etch bonding in orthodontics using cyclic fatigue

In vitro evaluation of self-etch bonding in orthodontics using cyclic fatigue

A Review of Chemical-approach and Ultramorphological Studies on the Development of Fluoride-releasing Dental Adhesives Comprising New Pre-Reacted Glass Ionomer (PRG) Fillers

Effect of PMMA filler particles addition on the physical properties of resin composite

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