Effect of Tubule Orientation and Dentin Location on the Microtensile Strength of Bovine Root Dentin.

Jia, Lei; Hattori, Masayuki; Hasegawa, Koji; Yoshinari, Masao; Kawada, Eiji; Oda, Yutaka

doi:10.4012/dmj.21.73

Cited by 37 publications

(23 citation statements)

References 32 publications

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“…Tubule density in the coronal region of root dentin was found to be higher than that in the apical region, and the diameter of the tubules decreases in an apical direction 35) . However, Liu et al 33) reported that dentin region did not affect the microtensile strength of bovine root dentin. Additionally, it was found that bond strength to root canal dentin was neither influenced by dentin depth nor tubule density when a self-etch adhesive system was used 32) .…”

Section: Discussionmentioning

confidence: 99%

“…Further, the adhesive surface was not perpendicularly exposed to the light source, which meant that light energy tended to decrease with distance. It was reported that dentin mechanical properties and structure are dependent on the dentin region [32][33][34] . Tubule density in the coronal region of root dentin was found to be higher than that in the apical region, and the diameter of the tubules decreases in an apical direction 35) .…”

Section: Discussionmentioning

confidence: 99%

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Effects of photocuring strategy on bonding of dual-cure one-step self-etch adhesive to root canal dentin

et al. 2009

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This study evaluated the effects of light power density and light exposure time on regional bond strength of Clearfil DC Bond to root canal dentin. Post spaces were prepared in extracted premolars. Root canal dentin was treated with a dualcure bonding system, Clearfil DC Bond, and light-cured for 10, 20, or 30 seconds using two halogen light curing units: Optilux 501 (830 mW/cm 2 ) and Hyperlightel (1350 mW/cm 2 ). Following which, all post spaces were filled with a dual-cure resin composite. After 24-hour storage, microtensile bond strengths (μTBS) at the coronal and apical regions were measured. At the coronal region, μTBS values were similar among all the experimental groups. At the apical region, bond strength improved when the curing time was extended to 30 seconds with Optilux 501, and likewise with Hyperlightel when curing time was extended to 20 or 30 seconds. In addition, significant differences in μTBS between the coronal and apical regions disappeared with prolonged curing times.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Effects of photocuring strategy on bonding of dual-cure one-step self-etch adhesive to root canal dentin

et al. 2009

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“…After extraction, the teeth were stored immediately in distilled water at about 4 for a maximum period of three months before use. Since occlusal dentin tends to give a lower bond strength than proximal or buccal dentin 15,16 , and that dentinal tubule orientation and location significantly influence mechanical strength test results 17,18 , buccal surfaces were used for marginal gap measurement in Class V cavities while proximal surfaces were used for shear bond strength measurements in this study.…”

Section: Methodsmentioning

confidence: 99%

Effect of Thermocycling on Interfacial Gap-formation in Class V Cavities and Mechanical Properties of Spherical Silica Filler Addition to Resin-modified Glass Ionomer Restorations

Hatanaka¹,

Irie²,

Tjandrawinata³

et al. 2006

Dent. Mater. J.

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The effects of thermocycling at 20,000 cycles and addition of silanized spherical silica filler SF on resin-modified glass ionomer cement RMGIC restorations were investigated. A RMGIC added with an untreated spherical silica filler UF was used as a comparison. Marginal gaps in Class V tooth cavities, compressive strength, diametral tensile strength, flexural strength, and shear bond strengths to enamel and dentin were examined. All thermocycled samples showed decreased frequency of marginal gap formation as compared to the 24-hour samples, with reduction of 73 to 95 . At the immediate condition, after 24 hours, and after thermocycling, the addition of 10 wt SF yielded the most favorable results in terms of marginal gap formation in Class V cavities, compressive strength, flexural strength, and shear bond strength to enamel. Diametral tensile strength and flexural strength were also increased significantly by the addition of 5 wt SF. Further, shear bond strength tests showed that the addition of SF had no effect on bonding capability to enamel and dentin.

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“…In particular, in the context of clinical applications, materials should have compatible moduli. On this note, elastic moduli of tooth substrates and restorative materials have been measured with compressive, flexural, and tensile tests [9][10][11][12][13] . Owing to localized structural variations, reported mechanical properties of teeth have run the whole gamut.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Bleaching on the Elastic Modulus of Bovine Enamel

et al. 2007

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The purpose of this study was to determine the elastic modulus of enamel during bleaching procedure with the use of an ultrasonic device. Enamel sections were obtained from freshly extracted bovine incisors. Specimens were exposed to 10％ carbamide peroxide for two hours, followed by an application of a fluoride-containing toothpaste for five minutes and stored in artificial saliva (pH 7.0). An ultrasonic device was used to measure the sound velocities of longitudinal and shear waves as well as elastic modulus. The mean elastic modulus of bleached enamel decreased with time, from 15.5 GPa to 10.1 GPa. Conversely, the elastic modulus of bleached enamel followed by application of a fluoride-containing toothpaste increased with time, from 15.2 GPa to 20.2 GPa. Results of this study indicated that a decrease in elastic modulus associated with bleaching occurred, and that fluoride-containing toothpaste reversed this effect.

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Effect of Tubule Orientation and Dentin Location on the Microtensile Strength of Bovine Root Dentin.

Cited by 37 publications

References 32 publications

Effects of photocuring strategy on bonding of dual-cure one-step self-etch adhesive to root canal dentin

Effects of photocuring strategy on bonding of dual-cure one-step self-etch adhesive to root canal dentin

Effect of Thermocycling on Interfacial Gap-formation in Class V Cavities and Mechanical Properties of Spherical Silica Filler Addition to Resin-modified Glass Ionomer Restorations

The Effect of Bleaching on the Elastic Modulus of Bovine Enamel

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