Hardness and young's modulus of human peritubular and intertubular dentine

Kinney, J.H.; Balooch, M.; Marshall, Sally J.; Marshall, Grayson W.; Weihs, Timothy P.

doi:10.1016/0003-9969(95)00109-3

Cited by 312 publications

(218 citation statements)

References 17 publications

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“…The high density of dentine tubules and/or the less mineralized intertubular dentine matrix of the inter radicular dentine near the pulp may give a unique mechanical characteristic of root canal surface dentine compared to other parts of radicular dentine [20,21]. Traditional means of assessing mechanical properties of this surface have been through classical micro or nanohardness apparatuses yet these techniques require a high amount of surface polishing that removes a portion, or perhaps all, of the inner radicular dentine.…”

Section: Discussionmentioning

confidence: 99%

A novel approach to evaluate the effect of medicaments used in endodontic regeneration on root canal surface indentation

Yassen¹,

Chu²,

Gallant³

et al. 2013

Clin Oral Invest

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Objectives: To investigate the capability of a novel reference point indentation apparatus to test the indentation properties of root canal surface dentine treated with three intracanal medicaments used in endodontic regeneration. Materials and Methods:Immature human premolars were selected (n=22). Four specimens were obtained from each root and randomly assigned to three treatment groups and a control group. Each specimen was exposed to one of three treatment pastes (triple antibiotic (TAP), double antibiotic (DAP), or calcium hydroxide [Ca(OH) 2 ] or neutral de-ionized water (control) for one or four weeks. After each time-interval, the indentation properties of the root canal dentine surfaces were measured using a BioDent reference point indenter. Two-way ANOVA and Fisher's Protected Least Significant Differences were used for statistical analyses.Results: Significant differences in indentation parameters and estimated hardness between all groups at both time points were found. TAP treated dentine had the highest significant indentation parameters, followed by DAP treated dentine, untreated control dentine and Ca(OH) 2 treated dentine, respectively. Furthermore, TAP treated dentine had the lowest significant estimated hardness, followed by DAP treated dentine, untreated control dentine and Ca(OH) 2 treated dentine, respectively. Conclusion: BioDent reference point indenter was able to detect significant differences in indentation properties of root canal dentine treated with various medicaments.Clinical Relevance: The use of a reference point indenter is a promising approach to characterize the indentation properties of root canal surfaces without any surface modification. This might provide an in vitro mechanical measurement that is more representative of the actual clinical situation.

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Section: Discussionmentioning

confidence: 99%

A novel approach to evaluate the effect of medicaments used in endodontic regeneration on root canal surface indentation

Yassen¹,

Chu²,

Gallant³

et al. 2013

Clin Oral Invest

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“…If carious teeth are used, higher radiation doses may be necessary and might cause alterations in material structure and properties. Nano-indentation has become a common technique for the determination of local mechanical properties of structural features in biological hard tissues [12][13][14]. Hence, while investigations of the mechanical properties (hardness, surface morphology and bond strength) on a micro-scale showed no effect of radiation doses up to 25 kGy [15][16][17][18], the effect on the mechanical properties on a nano-scale needed to be investigated.…”

Section: Introductionmentioning

confidence: 99%

Effect of sterilization by gamma radiation on nano-mechanical properties of teeth

Brauer¹,

Saeki²,

Hilton

et al. 2008

Dental Materials

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Objectives. Extracted teeth used in dental research need to be considered infective and hence be sterilized without the materials properties being altered. This study examined the effect of gamma radiation on the nano-mechanical properties of dentin and enamel of extracted human third molars.Methods. Whole teeth were sterilized using gamma radiation doses of 7 kGy and 35 kGy, respectively; teeth of the control group were not treated with gamma radiation. Crowns were sectioned occlusally and polished. Elastic modulus and hardness were tested using atomic force microscopy with nano-indentations under wet conditions.Results. We found no significant dose-response relationship in elastic modulus or hardness in either dentin or enamel.Significance. Nano-indentation is a common technique for the determination of local mechanical properties in biological hard tissues. Gamma radiation is an efficient way to sterilize extracted teeth while alterations of dentin and enamel mechanical properties are minimized.

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“…This highly oriented microstructure is believed to confer anisotropy to the mechanical properties, although the magnitude and orientation of the anisotropy is not well established. Indeed, after some five decades of research on the mechanical properties of dentin [e.g., [3][4][5][6][7][8][9][10][11][12][13][14][15], there is still little consistency in some of the basic questions that dictate its structural behavior.…”

Section: Introductionmentioning

confidence: 99%

Effect of orientation on the in vitro fracture toughness of dentin: the role of toughening mechanisms

2003

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Toughening mechanisms based on the presence of collagen fibrils have long been proposed for mineralized biological tissues like bone and dentin; however, no direct evidence for their precise role has ever been provided. Furthermore, although the anisotropy of mechanical properties of dentin with respect to orientation has been suggested in the literature, accurate measurements to support the effect of orientation on the fracture toughness of dentin are not available. To address these issues, the in vitro fracture toughness of dentin, extracted from elephant tusk, has been characterized using fatigue-precracked compact-tension specimens tested in Hank's Balanced Salt Solution at ambient temperature, with fracture paths perpendicular and parallel to the tubule orientations (and orientations in between) specifically being evaluated. It was found that the fracture toughness was lower where cracking occurred in the plane of the collagen fibers, as compared to crack paths perpendicular to the fibers. The origins of this effect on the toughness of dentin are discussed primarily in terms of the salient toughening mechanisms active in this material; specifically, the role of crack bridging, both from uncracked ligaments and by individual collagen fibrils, is considered. Estimates for the contributions from each of these mechanisms are provided from theoretical models available in the literature.

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Hardness and young's modulus of human peritubular and intertubular dentine

Cited by 312 publications

References 17 publications

A novel approach to evaluate the effect of medicaments used in endodontic regeneration on root canal surface indentation

A novel approach to evaluate the effect of medicaments used in endodontic regeneration on root canal surface indentation

Effect of sterilization by gamma radiation on nano-mechanical properties of teeth

Effect of orientation on the in vitro fracture toughness of dentin: the role of toughening mechanisms

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