巻号一覧
15 巻 (1965)
- 3 号 p. 105-
- 2 号 p. 45-
- 1 号 p. 18-
15 巻, 3 号
選択された号の論文の6件中1～6を表示しています
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須之内 淳二1965 年 15 巻 3 号 p. 105-113
発行日: 1965年
公開日: 2010/03/02
ジャーナル フリーPDF形式でダウンロード (1544K) -
北村 中也1965 年 15 巻 3 号 p. 114-125
発行日: 1965年
公開日: 2010/07/27
ジャーナル フリーThe report about growth and development, calcification and eruption year of teeth had been made and published by many investigators but mutual relation between teeth and paradentium was not understood accurately.
Upper and lower central incisors had been continuously observed for 17.5 months (upper 48 samples, lower 11 samples) by contrast radiography, originally, developed for the purpose.
Clinical teeth crown length before and after dental completion is measured and change from clinical dental crown length to anatomical crown length after dental emergence was observed in 526 samples (upper 279, lower 247) in association with continuous observation groups.
Obtained results were as follows :
1. Rider was set on the cutting-edge of incisor and labial surface of dental crown and gingival boundary line were plastered with contrast medium. Approximately value of clinical dental crown length and teeth length from radiography were found.
2. When the teeth in jaw attained three-quarters of completed teeth length, their eruption was found in oral cavity.
3. Judging from continuous observation groups, growth velocity of clinical dental crown length and teeth length in upper or lower jaws fast, 4 or 5 months after eruption but slower late after its time.
4. Clinical dental crown length attained one-half of anatomical crown length in upper jaw about a year after emergence and in lower jaw about a year and 2.5 months.
5. From the result of statistical analysis, the developmental relation between clinical dental crown length and teeth length was of high correlation.
(r=0.97, Y=-15.92 + 0.94 X, in upper; r =0.98, Y=-11.014-0.76 X, in lower)
6. Judging from continuous observation groups and other observation groups, the root was complet 27.17 months in upper and 30.93 months in lower after emergence.
7. Clinical dental crown length was in upper about 60.9 % and in lower about 58 % of anatomical crown length at the time of root completion.
8. After root completion, clinical dental crown length was linear in semi-logarithmic table. Clinical dental crown length increased in propotion to a logarithm of months.
9. Clinical dental crown length was in accord with anatomical crown length in upper 822 months (approximately 69 years) and in lower 619 months ( approximately 52 years) after emergence.抄録全体を表示PDF形式でダウンロード (3181K) -
塗布条件並びにpHによる離脱の研究広瀬 毅1965 年 15 巻 3 号 p. 126-137
発行日: 1965年
公開日: 2010/03/02
ジャーナル フリーStudies were conducted, from the standpoint of tin, by making use of radioactive tin-113, on the anti-corrosive effect of stannous fluoride on the enamel of an extracted tooth.
The radioactive stannous fluoride was produced by leaving a large quantity of 113SnF2 mixed with a very small amount of 113SnCl2 as it was for 3 hours, in order to transform 113SnCl2 obtained into 113SnF2. Therefor was used the substitution equivalent to effect halogen ion of fluorine (F) and chlorine (Cl) adhering to tin ion (Sn++) of both elements.
As the experimental item, the conditions and adhering status of stannous fluoride at the time of application were measured by the well-type scintillation counter from the aspect of radioactivity, while the domain of its segregation was observed by auto-radiography. And, measurement was also made on the segregation amount of tin in the acid-alkali solution.
The results obtained were as follows :
1. It is optimum to apply the ointment at 8% in concentration for 2-3 hours.
2. The tin of stannous fluoride adheres evenly to the surface of healthy and normal enamel, especially much to the carious and damaged parts.
3. The segregation of tin caused by the acid-alkali solution is more violent as acid is stronger, and a large amount of segregation of tin in pH 5.0-pH 3.0 has been observed since the early stage.抄録全体を表示PDF形式でダウンロード (2597K) -
岡田 昭五郎, 赤田 弘正, 永井 充1965 年 15 巻 3 号 p. 138-144
発行日: 1965年
公開日: 2010/03/02
ジャーナル フリーRecently, the accumulation of radioactive strontium in human bone and teeth caused by nuclear bomb test fallout are increasing. Kerwin proposed the speculation that the retention of radioactive strontium in human body will be increased by drinking fluoridated water everyday, because strontium and fluorine may precipitate within the body as insoluble SrF2. The purpose of this study was to investigate the retention or accumulation of radioactive strontium in the body of animals drinking fluoridated water in graded concentration.
Experimental method and result were as follows:
Four-week aged rats were used for this study. All animals received relatively low fluoride diet and fluoridated drinking water throughout the experiment. According to the concentration of fluorine in drinking water, the animals were divided into 1, 10, 25 and 100 ppm of fluorine groups and control group, and fed for forty days. At forty-first day, those animals were orally administered a single dose of 89Sr, and were sacrificed after one, ten and twentyfive days. 89Sr in femurs in all groups and 89Sr in lower incisor in 10 and 100 ppm fluorine group and control group were analysed.
The significant increase of radioactivity over that of the respective control group were found in 1 ppm fluorine group sacrificed on the 26th day and in 100 ppm fluorine group sacrificed next day, while other experimental groups showed no significant difference compared with the control group.
Following the above experiment, the accumulation of 89Sr in rats was investigated, which were given 89Sr everyday through the experiment. The animals were first given 1, 10 or 50 ppm fluoridated water and low fluoride diet respectively for four weeks and then 89Sr was added to the ration for fifty days. Finally 89Sr in femur and incisor were analysed.
Nither average value of 89Sr in femur nor in incisor in experimental groups (drinking fluoridated water) showed significant differences as compared with that of the control group (drinking distilled water).
The conclusion drawn from above two experiments was that there was no constant correlation between fluorine concentration of drinking water and the retention of 89Sr in hard tissue. And the accumulation of 89Sr in hard tissue in fluoridated groups were not significantly higher than that of the control group even after 50 day administration of 89Sr. Based on these findings the authers could not acknowledge the validity of the speculation of Kerwin.抄録全体を表示PDF形式でダウンロード (1234K) -
I. Wister鼠の実験う蝕研究に於けるEDTA―鉛注射による硬組織内時刻描記法の応用大西 正男, 尾崎 文子, 三村 二, 小椋 秀亮, 玉置 幸子1965 年 15 巻 3 号 p. 145-149
発行日: 1965年
公開日: 2010/03/02
ジャーナル フリー歯が石灰化中の幼Wister鼠にEDTA-鉛を皮下注射すると“鉛線鼠”ができる。この鼠の成長は普通と変らないし, またう蝕形成性食に対して抵抗性でもなく, 感受性でもない。この実験的に作られた歯を持つ鼠は歯質内のマークされた鉛線に囲まれた部分とその外囲のう蝕感受性比較研究に使用できると考察された。象牙質の変化と鉛線の関係の重要性が指摘された。抄録全体を表示PDF形式でダウンロード (1416K) -
II. Wister鼠に作った糖害う蝕の発生部位と罹患度の表現方式大西 正男, 尾崎 文子, 玉置 幸子1965 年 15 巻 3 号 p. 150-155
発行日: 1965年
公開日: 2010/03/02
ジャーナル フリー374匹のWister鼠に発生した糖害性う蝕を記載した結果, 平滑面う蝕と不規則な裂溝に発生したう窩を除くと, 上下顎片側12か所の裂溝が規則的に観測しなければならない箇所となり, その時捨てられたう窩率は1.95%であった。更に簡単化のために発生率の少い裂溝を捨てると規則的に観察しなければならないのは上下顎片側10か所となり, この時捨てられるう窩率は5.15%である。罹患度は下顎第一臼歯の3裂溝, 第二臼歯の2裂溝, それと上顎第三臼歯の1裂溝の6か所を観察してう窩数で1度から6度に分けることができる。う窩の発生は左右同数と認められたので, 鉛線鼠による実験では一側を漂白標本とし, う窩数を数えやすくし, 他側を組織観察に使用することができる。抄録全体を表示PDF形式でダウンロード (904K)
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