Dentin Erosion Simulation by Cantilever Beam Fatigue and pH Change

Staninec, Michal; Nalla, Ravi K.; Hilton, Joan F.; Ritchie, Robert O.; Watanabe, Larry G.; Nonomura, Grace; Marshall, Grayson W.; Marshall, Sally J.

doi:10.1177/154405910508400415

Cited by 38 publications

(36 citation statements)

References 12 publications

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“…Staninec et al 36 investigated the magnitude and location of tooth structure loss using sectioned segments of tooth structure that were subjected to cyclic mechanical loading. Despite the obvious limitation of using sectioned segments of tooth structure, they found that there was a greater loss of material in high-stress areas, supporting the possibility of abfraction.…”

Section: Experimental Evidence Of Abfractionmentioning

confidence: 99%

Abfraction: separating fact from fiction

Michael¹,

Townsend²,

Greenwood³

et al. 2009

Australian Dental Journal

143

114

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Non-carious cervical lesions involve loss of hard tissue and, in some instances, restorative material at the cervical third of the crown and subjacent root surface, through processes unrelated to caries. These non-carious processes may include abrasion, corrosion and possibly abfraction, acting alone or in combination. Abfraction is thought to take place when excessive cyclic, non-axial tooth loading leads to cusp flexure and stress concentration in the vulnerable cervical region of teeth. Such stress is then believed to directly or indirectly contribute to the loss of cervical tooth substance. This article critically reviews the literature for and against the concept of abfraction.Although there is theoretical evidence in support of abfraction, predominantly from finite element analysis studies, caution is advised when interpreting results of these studies because of their limitations. In fact, there is only a small amount of experimental evidence for abfraction. Clinical studies have shown associations between abfraction lesions, bruxism and occlusal factors, such as premature contacts and wear facets, but these investigations do not confirm causal relationships. Importantly, abfraction lesions have not been reported in pre-contemporary populations.It is important that oral health professionals understand that abfraction is still a theoretical concept, as it is not backed up by appropriate clinical evidence. It is recommended that destructive, irreversible treatments aimed at treating so-called abfraction lesions, such as occlusal adjustment, be avoided.

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Section: Experimental Evidence Of Abfractionmentioning

confidence: 99%

Abfraction: separating fact from fiction

Michael¹,

Townsend²,

Greenwood³

et al. 2009

Australian Dental Journal

143

114

View full text Add to dashboard Cite

show abstract

“…An in vitro simulation demonstrated material loss from the dentin surface due to the presence of cyclic (fatigue) stresses, although the magnitude of the loss was small. [14] However, once a notch is formed, it does act to concentrate stress in that location and thus is presumed to be a factor in the eventual de-bonding failure of restorations of NCCL's. [15,16] The fatigue behavior of dentin has been examined in recent studies [17,18], but there are no corresponding studies on the fatigue properties of enamel.…”

Section: Introductionmentioning

confidence: 99%

Fatigue of dentin–composite interfaces with four-point bend

et al. 2008

Self Cite

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Objectives-The objective was to determine the fracture and cyclic fatigue properties of composite-dentin beams bonded with a self-etching adhesive in four-point bend.Methods-Beams of rectangular cross-section were shaped to a size of ~0.87 × 0.87 × 10 mm and placed in a four-point bending apparatus, with the loading points 1.8 and 7.2 mm apart, with the interface centered between the inner rollers. Cyclical loading was performed in Hanks' Balanced Salt Solution at 25°C, with forces between 54% and 99% of the bending strength of the bonded beams.Results-Solid dentin and solid composite beams [n = 6] had bending strengths of 164.4 and 164.6 MPa, respectively, under monotonically increasing loads. Bonded beams [n = 6] had strengths of 90.6 MPa. No significant difference was found between solid composite and solid dentin beams, the bonded beams were different (ANOVA, p = 0.000) With long-term cycling, stresses below 49 MPa were tolerated for 10 6 cycles, but with increasing stress up to 90 MPa, beams failed earlier, demonstrating that subcritical fatigue cycling will eventually cause failure.Significance-Fatigue may be a significant mechanism of dentin-composite bond degradation.

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“…The high clinical incidence and prevalence of noncarious cervical lesion (NCCL) has led to questions about the factors involved on the formation and progression of these lesions [1][2][3][4][5][6][7][8]. Clinically, the association among maxillary premolars with endodontic access, MOD restoration, and NCCL presence is a routine situation in clinical practice.…”

Section: Introductionmentioning

confidence: 99%