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Volume 67 (2000)
- Issue 4 Pages 291-
- Issue 3 Pages 233-
- Issue 2 Pages 129-
- Issue 1 Pages 1-
Volume 67, Issue 3
Displaying 1-9 of 9 articles from this issue
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Miyuki Azuma2000 Volume 67 Issue 3 Pages 233-239
Published: September 30, 2000
Released on J-STAGE: October 08, 2010
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Takayoshi Yoshida2000 Volume 67 Issue 3 Pages 240-250
Published: September 30, 2000
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSThe purpose of this study was to investigate the relation between the artificial crown contour and plaque accumulation in severely disabled patients who have muscle hypoactivity in the oral region. This relation was statistically analyzed by the change in CFU numbers of Mutans Streptococci, Lactobacillus, and total anaerobic bacteria.
The results were as follows:
1. In the severely disabled group, there was no significant difference in the decrease of number of microorganisms between with and without tooth brushing. When the normal contour crown was exchanged for the under contour, however, the numbers of Mutans Streptococci and total anaerobic bacteria decreased significantly (p < 0.05) .
2. In the normal control group, both the crown contour and tooth brushing were effective for decreasing the number of Mutans Streptococci and total anaerobic bacteria (p<0.05) .
3. In both groups, the number of Lactobacillus was decreased by changing the crown contours and by tooth brushing, with no statistical significance.
4. In view of the cariogenic potential of microorganisms, it is concluded that the under contour crown prevents plaque accumulation, and that this crown should be used on severely disabled patients, as it makes tooth brushing more effective.View full abstractDownload PDF (3455K) -
Noriko Sugawara2000 Volume 67 Issue 3 Pages 251-263
Published: September 30, 2000
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSThe purpose of this study is to clarify the occlusal contact mode between the upper and lower molars on the working side of group function occlusion during lateral excursion.
After the intercuspal position (IP) and two lateral positions (Ll, the middle point between IP and L2 ; L2, the edge-to-edge occlusal position of the molars) on the Gothic arch were defined, occlusal contact
relations in these three occlusal positions were recorded, using black silicone. Digital data of real occlusal contacts and visualized data of close (less than 3opm) occlusal areas, by computer image processing, were analyzed.
The conclusions are as follows
1. Although the numbers of real occlusal contacts and the visualized occlusal area tend to decrease toward L2 during lateral excursion, the former, in some cases, goes up and down.
2. Functional cusps play an important part in occlusal contact at the intercuspal position.
3. Occlusal contact points are on the functional cusps of the upper and lower molars, which can be clinically regarded as certain points, and these points slide on the inclining non-functional cusps of antagonistic teeth during lateral excursion.
4. Each upper and lower molar has 2 to 6 occlusal contact points near the top functional cusps at the intercuspal position, and some of them contact continuously during lateral excursion.View full abstractDownload PDF (8320K) -
Takayuki Kobayashi2000 Volume 67 Issue 3 Pages 264-271
Published: September 30, 2000
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSAcceleration and deceleration of bone like crystal growth on electrically polarized hydroxyapatite ceramics are induced by their surface changes, as recently reported by Yamashita, et al. In this study, newbone-forming ability of electrically polarized hydroxyapatite was physicochemically characterized and histologically evaluated using femora and tibiae of rabbits. The electrical polarizability of hydroxyapatite was demonstrated by thermally stimulated current measurements. No significant difference between polarized and non-polarized hydroxyapatite was recognized by IR spectroscopy and X-ray diffractometry. A negatively charged hydroxyapatite surface exhibited osteogenesis with direct bone contacting in early stage. A positively charged surface resulted in a small amount of bone formation on the surface. On the contrary, in the zone isolated by fibrous layer, a large volume of bone newly formed. It is useful that the outstanding bone formability in the early stage on a negatively charged surface implies more rigid initial fixation in orthopedic and dental fields. Positively charged surfaces have a new-bone-conducting property that acts over a long distance, and the possibility of controlling osteogenesis.View full abstractDownload PDF (4525K) -
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...2000 Volume 67 Issue 3 Pages 272
Published: September 30, 2000
Released on J-STAGE: October 08, 2010
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[in Japanese], [in Japanese]2000 Volume 67 Issue 3 Pages 273
Published: September 30, 2000
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (2223K) -
[in Japanese], [in Japanese], [in Japanese]2000 Volume 67 Issue 3 Pages 274
Published: September 30, 2000
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (175K) -
[in Japanese], [in Japanese]2000 Volume 67 Issue 3 Pages 275
Published: September 30, 2000
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (183K) -
[in Japanese], [in Japanese]2000 Volume 67 Issue 3 Pages 276
Published: September 30, 2000
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (177K)
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