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Volume 48 (1981)
- Issue 4 Pages 311-
- Issue 3 Pages 255-
- Issue 2 Pages 199-
- Issue 1 Pages 1-
Volume 48, Issue 3
Displaying 1-11 of 11 articles from this issue
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—A Review of Some Recent Investigations—Shogoro Okada1981 Volume 48 Issue 3 Pages 255-260
Published: September 30, 1981
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (708K) -
Shiro Suzuki1981 Volume 48 Issue 3 Pages 261-276
Published: September 30, 1981
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSThe present study is concerned with the improvement of the mechanical properties of the hard crown and bridge resins by the use of new composite fillers. The author studied the properties of the hard resins containing the composite fillers instead of the PMMA powder which is conventionally used in the hard resins. The composite fillers were prepared using several polyfunctional monomers and hydrophobic colloidal silica. The properties studied included compressive strength, transverse strength, abrasion, Brinell hardness, water absorption and thermal expansion coefficient. The filler prepared from the TMPT monomer, tri-methylol propane trimethacrylate, was the most useful, showing an improvement of the mechanical properties of the hard resin. The TMPT composite filler contains vinylic double bonds and it is possible for these groups to copolymerize with the matrix. The author determined that the combination of 2.6E·UDMA comonomer and TMPT composite filler was the best for the hard resin in this study. This combination exhibited the maximum compressive strength, transverse strength and Brinell hardness and the minimum thermal expansion coefficient. This hard resin was superior to the hard resins on the market.View full abstractDownload PDF (8983K) -
Masato Yazawa1981 Volume 48 Issue 3 Pages 277-291
Published: September 30, 1981
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSThe effects of molybdenum (Mo) on the dental caries of the hamsters were studied. All animals were challenged with Str. mutans after weaning for 5 days and were bred on Diet #2000 for 61 days. Mo was added to the drinking water after weaning, or added to the diet and/or drinking water before weaning. The teeth were scored for caries by the method of Keyes.
Results are as follows:
1) The caries score of the male hamsters were higher than those of the hamsters in the control group. This tendency is observed in the experimental group.
2) The animals administered with Mo in the drinking water (2 ppm Mo) atter weaning naa less caries than the control group, but the difference between the two groups was not statistically significant.
3) The animals administered with Mo in the diet and drinking water (5 ppm Mo added to the diet and water) for 10 days before weaning had a significantly lower caries score than the control group.
4) The animals administered with Mo in the diet and drinking water for 10 days before weaning (5 ppm Mo) and throughout the experimental period (2 ppm Mo after weaning) showed a lower caries score, which was not statistically significant compared to those of the control group.
5) The body weight gain of the animals was better in the Mo group, but the weight gain of the control group for 5 days after weaning was poor except in the summer.
It was concluded that Mo administration is more effective before weaning than after weaning. The anti-caries effect of Mo suggested the influence of the systemic factors.View full abstractDownload PDF (1496K) -
Chikako Nakamura, Norio Shimura, Yasuo Hirayama, Masami Yonemitsu, Kei ...1981 Volume 48 Issue 3 Pages 292-301
Published: September 30, 1981
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSPersonality test, general anxiety test (GAT) and fatigue grade test were conducted on 521 children in the 4th, 5th and 6th grade in an elementary school to clarify the relationship between the dental caries and the human adaptation processes in their environment. Children with high inadaptable personality scores presented a high anxiety and fatigue score. In each class, the GAT score correlated with the fatigue score. Children who lead a regular life showed less anxiety and fatigue.
There was a tendency of more childern with approximal dental caries in the group with a high GAT score. In children when a newly erupted second molar became caries they showed higher GAT score. Many of the boys whose newly erupted second molar did not become caries woke up in the morning by themselves.
Therefore it is considered that children who lead a self-supporting life deal successfully with the stresses which lead to dental caries. It is concluded that life style must be regarded as an important factor to prevent dental caries.View full abstractDownload PDF (1160K) -
[in Japanese]1981 Volume 48 Issue 3 Pages 302
Published: September 30, 1981
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (104K) -
[in Japanese]1981 Volume 48 Issue 3 Pages 303
Published: September 30, 1981
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (1661K) -
[in Japanese]1981 Volume 48 Issue 3 Pages 304
Published: September 30, 1981
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (145K) -
[in Japanese]1981 Volume 48 Issue 3 Pages 305
Published: September 30, 1981
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (132K) -
[in Japanese]1981 Volume 48 Issue 3 Pages 306
Published: September 30, 1981
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (1711K) -
[in Japanese]1981 Volume 48 Issue 3 Pages 307
Published: September 30, 1981
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (1875K) -
[in Japanese]1981 Volume 48 Issue 3 Pages 308
Published: September 30, 1981
Released on J-STAGE: October 08, 2010
JOURNAL FREE ACCESSDownload PDF (115K)
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