Comparison of nanohardness between coronal and radicular intertubular dentin

Inoue, Toshiko; Saitô, Makoto; Yamamoto, Masato; Debari, Kazuhiro; Kou, Keitatsu; Nishimura, Fumio; Miyazaki, Takashi

doi:10.4012/dmj.28.295

Cited by 34 publications

(38 citation statements)

References 33 publications

(40 reference statements)

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“…The mean hardness values of control dentine from this calculation were 0.49 and 0.52 GPa at both time points. These values are slightly lower than the untreated radicular dentine nanohardness values reported in previous studies, which ranged between 0.55-0.76 GPa [22,23]. Several factors could account for these differences including the immature nature of the dentine selected in this study, the location of dentine measured, and the technique used.…”

Section: Discussioncontrasting

confidence: 49%

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: Discussioncontrasting

confidence: 49%

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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“…The exposed cross-sections were polished and then placed into ultrasonic bath (Bandelin Sonorex GT 120 Transistor, Bandelin Electronics, Germany) for 5 minutes to remove the smear layer [31], dehydrated with 70% ethanol, and stored in a desiccator for 24 hours. Afterwards, the samples were sputter-coated in a vacuum with a thin carbon layer (Vacuum Evaporator, Type JEE-SS, JEOL, Tokyo, Japan).…”

Section: Dentin Microstructure and Elemental Analysesmentioning

confidence: 99%

Animal and human dentin microstructure and elemental composition

et al. 2014

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AbstractAnimal teeth are a common model in studies on dentin adhesive materials. The aim of this study was to compare microstructural parameters (density and diameter of dentinal tubules (DT), peritubular dentin (PTD) thickness, PTD and intertubular dentin (ITD) surface area) and chemical characteristics of canine, porcine, equine, and human root dentin. The middle layers of dentin were harvested just below a cemento-enamel junction from incisors and investigated by means of scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDXS). SEM evaluation of the specimens revealed, that porcine dentin shared most similarities with human dentin. When comparing the density of DTs, canine dentin was also found to be similar to human dentin. Elemental composition of the root dentin did not differ significantly in porcine, equine and human dentin, but in canine dentin higher magnesium value in PTD compared to ITD was found. It is known that microstructural and chemical characteristics affect the strength of the adhesive bonds created among restorative materials and dentin. According to the results of this study, porcine dentin seems to be the most appropriate model to study dental materials to be used in human restorative dentistry.

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“…In the cervical third of the root there is a larger quantity of dentinal tubules than there is in the apical region, and tubule diameters diminish as they approach the apical region [33,34,17]. Studies conducted by Foxton et al [35] and Mallmann et al [36] affirmed that the bond in cervical and middle thirds is stronger than it is in apical third.…”

Section: In Vitro Study On the Influence Of The Light Polymerization mentioning

confidence: 74%

In Vitro Study on the influence of the light polymerization technique and appliance on the bond strength of intra-radicular dowels

Nagase

Morimoto

Agra

et al. 2012

BDS

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ABSTRACTindirect technique.Forty bovine single root teeth with 12mm length were used in this study. Roots were endodontically treated and randomly divided into four groups according to the light curing unit and the technique used: group HD (direct technique, halogen lamp), group LD (direct technique, LED), group HI (direct-indirect technique, halogen lamp), group LI (direct-indirect technique, LED). Retention force was determined using a Universal Testing Machine (Instron). All data were analyzed using one-way analysis of variance (ANOVA) and Tukey's test. After the test, failure was examined and 28.95) did not show difference statistically but presented higher retention force than group HD (142.30N ± 25.60) and LD (178.56N ± 25.67). Most of fracture occurred in interface between dentin/resin. Based on the obtained results, it was

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Comparison of nanohardness between coronal and radicular intertubular dentin

Cited by 34 publications

References 33 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

Animal and human dentin microstructure and elemental composition

In Vitro Study on the influence of the light polymerization technique and appliance on the bond strength of intra-radicular dowels

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