Makoto Saito

Showa University, Shinagawa, Tōkyō, Japan

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Publications (5)1.89 Total impact

  • 01/2013; 33(3):248-251. DOI:10.7881/dentalmedres.33.248
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    ABSTRACT: In one aspect, this study examined the tensile strength of coronal dentin, as a function of the location of incremental lines, in two types of teeth: human molar versus bovine incisor. In another aspect, tensile strength in coronal dentin was examined with tensile loading in two different orientations to the incremental lines: parallel versus perpendicular. There were four experimental groups in this study: HPa, human molar dentin with tensile orientation parallel to the incremental lines; HPe, human molar dentin with tensile orientation perpendicular to the incremental lines; BPa, bovine incisor dentin with tensile orientation parallel to the incremental lines; BPe, bovine incisor dentin with tensile orientation perpendicular to the incremental lines. Tensile strengths of the parallel group (HPa and BPa) were significantly higher (p<0.05) than those of the perpendicular group (HPe and BPe). Effect of structural anisotropy, contributed by the incremental lines, was thus confirmed in coronal dentin. However, there were no differences in anisotropy effect between the two tooth types.
    Dental Materials Journal 07/2012; 31(4):541-8. DOI:10.4012/dmj.2012-024 · 0.94 Impact Factor
  • 01/2011; 31(3):228-231. DOI:10.7881/dentalmedres.31.228
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    ABSTRACT: This study investigated the hardness and Young's modulus of coronal and radicular intertubular dentin. Ten bovine teeth were each divided into coronal and radicular groups, and the flat surfaces of the coronal and radicular dentin were subsequently processed along the tooth axis. The hardness and Young's modulus of the coronal and radicular intertubular dentin were evaluated using nanoindentation tests, at two locations per tooth. Mean hardness and Young's modulus values were statistically compared by one-way ANOVA and Fisher's PLSD test. The hardness of coronal intertubular dentin was 0.81 +/- 0.05 GPa and that of radicular dentin was 0.55 +/- 0.02 GPa. Additionally, the Young's modulus of coronal intertubular dentin was 26.60 +/- 2.19 GPa and that of radicular dentin was 20.89 +/- 1.10 GPa. Findings of this study revealed that the hardness and Young's modulus of coronal intertubular dentin were greater than those of radicular intertubular dentin.
    Dental Materials Journal 06/2009; 28(3):295-300. DOI:10.4012/dmj.28.295 · 0.94 Impact Factor
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    ABSTRACT: This study investigated chemical components of coronal and radicular dentin using Fourier transform infrared spectroscopy. Five bovine teeth were divided into coronal and radicular portions, and coronal and radicular dentin slabs were prepared horizontally. The area intensities of amide I, amide II, amide III and phosphate of the coronal and radicular dentin were evaluated by Fourier transform infrared spectroscopy at two locations per tooth. The mean area intensities were compared statistically by one-way ANOVA and Fisher&apos;s PLSD tests. The amide I area intensity of coronal dentin was 8.67±2.20 and that of radicular dentin was 12.29±2.47. The amide II area intensity of coronal dentin was 0.84±0.25 and that of radicular dentin was 1.94±0.45. The amide III area intensity of coronal dentin was 0.17±0.03 and that of radicular dentin was 0.50±0.10. Additionally, the phosphate area intensity of coronal dentin was 24.45±9.23 and that of radicular dentin was 42.05±3.67. All of the area intensities of coronal dentin were lower than those of radicular dentin.
    01/2009; 29(2):134-138. DOI:10.7881/dentalmedres.29.134

Publication Stats

13 Citations
1.89 Total Impact Points

Institutions

  • 2009–2012
    • Showa University
      Shinagawa, Tōkyō, Japan

Disciplines