Amalgamated alloy, kept in a dryice-ethanol mixture in frozen state over-night, was applied for the filling of 201 molar cavities of school children, as an control of this experimental group, 233 cavities of same school years were treated by the alloy amalgamated just before application.
A year later, two groups were compared in respect of appearance of the secondary lesion, and statistically showed no significant differences at 5% level.
The fact would indicate the more convinient use of the frozen amalgam in the field of mass treatment in caries control.

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Prior to regular oral health examinations, a total of 386 elementary school children were subjected to a survey by the use of questionnaires. Findings revealed by the questionnaires were subsequently compared and studied with those findings obtained from actual oral health examinations which were conducted soon afterwards.
The following were salient conclusions arrived at.
1. The questionnaire form contained the 5 items of 1) if there was experienced a toothache in the immediate past, 2) if one thought that one could not chew food properly, 3) if one was conscious of the malalignment of one's teeth, 4) if one had a habit of keeping one's mouth open all the time, and 5) if the gum was easily susceptible to bleeding.
Subjective answers were asked to each of the items.
2. Of these 5 items contained in the questionnaires, items 1), 3) and 5) were though to be of much use to actural oral health examinations.

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This study was performed to know the cleaning effect of different types of toothbrushes. The head of toothbrush was designed to have same length of nylon bristles and same tufted space. Nine different types of toothbrushes were prepared as follows:
A. Trimmed shape
1. Straight trimmed to irregular height.
2. Straight trimmed to uniform height.
3. Convexly trimmed.
B. Diameter of bristles
1. 0.23 mm.
2. 0.33 mm.
3. 0.40 mm.
Eighteen patients who had no denture and were normal dentition were instructed to clean with modified Stillman's method for 5 minutes. Quantity of eliminated debris was calculated by specially prepared measure.
From the observation, the toothbrush that was tufted the widest bristles showed high effectiveness and it was significant at the 5% level by wholly-significant-difference method. Concerning the shape, the shape with straight trimmed to unifrom height showed high effectiveness, but it was statistically insignificant. During observation period, injuried gingiva by toothbrush was not observed.

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The effects of operation stress on the system were studied with the dynamic valances between the removal of vital load from the disease and the production of it by the operation strees using the patients in the domain of orall surgery.
Data used, Donaggio's reaction value (D-value): Zambrini-Watanabe's reaction value (Z-value): and the number of leucocyte and acidocyte in the fluidic blood, were collected from 76 males and 70 females (3 to 76 old years) who accepted the surgical treatment from April, 1961 to December, 1965 at Department of Oral Surgery, Mie Prefecture University Hospital.
Treated diseases were the fracture of jaw (22 cases), the tumor of jaw (19 cases), the phlegmon (15 cases), the maxillitis (37 cases), and the maxillary cyst (53 cases).
The following measurement values were used for the measurement indications, that was the preoperation value of each disease for a basal disease load, the value one day or 7 days after operation for with or without operation stress load respectively.
I) Succesive Changes of Each Indication
Ih the indications of both basal disease and operation stress loads, it was shown for D-value to be significant at 5 per cent and 2 per cent level in the phlegmon and the maxillary cyst respectively. Z-value and the number of leucocyte were recognized to be significant in all diseases. The number of acidocyte was shown at one per cent level in the fracture of jaw, the phlegmon, and the maxillary cyst. On the other hand, in the indication being disappered from the stress load, it was significant in all diseases without except the number of leucocyte in the tumor of jaw.
II) Examination of Indication between Each Disease.
In the indication of basal disease load, the significant difference in D-value was observed between the fracture of jaw and the phlegmon, maxillary cyst, or maxillitis. Moreover, it was shown between the maxillary cyst and the fracture of jaw, maxillary tumor, or phlegmon. In Z-value, the difference was able to indicate between the maxillary cyst and other disease. It was significant at 5 per cent level between the maxillary cyst and the phlegmon or between the maxillary cyst and the maxillitis in the number of leucocyte.
In the indication of operation stress load, the difference was significant in D-value at 0.1 per cent or one per cent level between the fracture of jaw and the maxillitis or the maxillary cyst respectively, 5 per cent between the phlegmon and the maxillary cyst. In the number of leucocyte it was at one per cent level between the phlegmon and the maxillary cyst. In the cases of Z-value and the number of acidocyte there were no differences.
In the indication disappered from the stress load, the difference was significant in D-value at 0.1 per cent leveleebetween the fracture of jae and the maxillitis, the maxillary cyst, 5 per cent between the phlegmon and the maxillitis, 2 per cent between the maxillitis and the maxillary cyst. In the number of leuco-and acidocyte it was at 0.1 per cent between the phlegmon and the maxillary cyst. The significant difference in Z-value was not recognized among the all diseases.
III) Correlation between Measurement Indications.
The correlations by diseases in the indications of no stress load was as follows. In the fracture of jaw, they were found out between D-value and the number of acidocyte, D-and Z-value in the maxillitis, and then between the number of leuco-and acidocyte in the maxillary cyst. However, the correlation was not recongnized in the phlegmon.
IV) Correlation between the Indication with the Operation Stress Load.
The correlation was in Z-value and the number of acidocyte of the tumor of jaw, D-value and the number of leucocyte of the maxillitis. However, it was not found out in the cases of the fracture of jaw, the phlegmon and the maxillary cyst.

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