Language：Japanese   Publisher：(NPO)日本歯科保存学会  

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Language：Japanese   Publisher：(一社)日本口腔ケア学会  

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Language：Japanese   Publisher：(株)デンタルダイヤモンド社  

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Language：Japanese   Publisher：(一社)日本口腔ケア学会  

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Language：Japanese   Publisher：(NPO)日本歯科保存学会  

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Language：Japanese   Publisher：(一社)日本口腔ケア学会  

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Language：Japanese   Publisher：(一社)日本癌治療学会  

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Language：Japanese   Publisher：特定非営利活動法人 日本歯周病学会  

Acess is a toothpaste and medical product for periodontal disease, that has sodium bicarbonate as its base component. Because of the high hardness level of sodium bicarbonate, it has been a problem in holding the Acess out from the surface of toothbrush holding Acess on the surface of a toothbrush has been a problem. For this reason, we developed trial toothbrushes, with U-shaped bristles in an attempt to improve the holding ability of the brushes for Acess. The purpose of this study was to investigate, by a questionnaire survey, the microbial plaque removal efficacy of the brushes using Acess and the level of comfort with their use. In this study, Toothbrush A, toothbrush B and manufactured toothbrush C were used. All the toothbrushes were used with Acess for one week. Then, we asked the patients to no brushing their teeth one day before the coming to our dental clinic. At the clinic, we evaluated the clinical parameters and the amount of microbial plaques attached to the teeth. Then, the patients brushed their teeth for five minutes at the clinic and we repeated quantity of microbial plaques. Finally, we calculated the removal rate of the microbial plaques. There were no differences in the removal rate of microbial plaques among the three toothbrushes examined in this study. On the other hand, more favorable improvement of the clinical parameters were observed for toothbrushes A and B, whereas, the clinical parameters remained at the baseline for toothbrush C. The results of the questionnaire survey showed that Acess was easier to hold on the bristles of toothbrushes A and B as compared to that on the bristles of toothbrush C. Furthermore Acess did not fall out of the bristles. Consequently, with our trial toothbrushes A and B, the rate of microbial plaque reduction was almost equal to that with toothbrush C. However, we found that Acess was held satisfactorily on the U-shaped bristles of toothbrush, improving the efficiency of maintenance of hygiene of the oral environment. Thereby, we conclude that application of Acess improved the clinical parameters examined in this study. Nihon Shishubyo Gakkai Kaishi (J Jpn Soc Periodontol) 56(2)：171-181, 2014.

DOI： 10.2329/perio.56.171

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Language：Japanese   Publisher：ライフケア学会  

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Language：Japanese   Publisher：ライフケア学会  

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Language：Japanese   Publisher：(NPO)日本歯科保存学会  

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Language：Japanese   Publisher：(NPO)日本歯周病学会  

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Language：Japanese   Publisher：(NPO)日本歯周病学会  

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Language：English   Publisher：国立大学法人 東京医科歯科大学  

Masticatory performance of denture wearers was compared with that of the normal subjects by analyzing the behavior of the mechanical properties of the bolus. The index of the ability to comminute bolus was described as the total number of masticatory strokes until swallowing and therefore this was chosen as the first index. Principal Component Analysis (PCA) on the data of six parameters; 80% energy, elasticity, viscosity, hardness, adhesiveness, and cohesiveness, indicated that the cohesiveness was independent of the other parameters and should be evaluated as the second index of the ability to dilute bolus with saliva. Two factor scores of the other parameters were calculated using the standardized scoring coefficient obtained from PCA and factor analysis on the data of the normal subjects, which realized to compare two groups on the same plane of factor scores. The movement of factor scores on the factor plane would indicate the total behavior of mechanical properties of bolus and was chosen as the third index of the ability to knead bolus. Triangle Diagram (TD) was completed by using these three indices. On the TD, all the subjects were lower level at least in one index than the normal subjects in all the foods.

DOI： 10.11480/jmds.550302

CiNii Books

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Language：Japanese  

CiNii Books

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Language：English   Publisher：国立大学法人 東京医科歯科大学  

The aim of this study was to investigate changing mechanical properties of the bolus during mastication and to quantify mechanical properties of the final bolus at swallowing. Changing mechanical properties of the bolus of three different types of foods (rice cracker, cheese and peanuts) by twelve normal dentitions were investigated by principal component analysis (PCA) on six mechanical properties (rupture energy, elasticity, viscosity, hardness, cohesiveness and adhesiveness). The raw data of cohesiveness immediately before swallowing was always constant. In all three food samples, the results by PCA on six parameters indicated that cohesiveness was independent from the remaining five parameters, and two factors were extracted on these five parameters by PCA. Furthermore, factor structure of bolus at swallowing showed no difference between the three food samples in spite of the variations in the raw data. The mechanical properties of swallowable bolus were clarified for the first time.

DOI： 10.11480/jmds.550202

CiNii Books

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Language：English   Publisher：国立大学法人 東京医科歯科大学  

The effect of different polishing materials on the surface texture and the color change of indirect prosthetic resin composite materials exposed to a staining agent was studied. Six different resin composites were polished using the same procedures and were measured for the gloss. After exposed to a coffee solution, the changes were measured on the color properties. The six different types of resin composites were further divided into four groups of eight specimens each for the different surface polishing procedure. The gloss was measured by a gloss meter (TC-108D, Tokyo-Densyoku, Tokyo, Japan) with an angle of 45° and expressed in gloss units (GU). Before and after exposure to the staining agent, the color measurements of all specimens were recorded with a colorimeter (TC-1800MKII, Tokyo-Densyoku, Tokyo, Japan) using CIE L* a* b*. All specimens were stored in the coffee solution for 5 weeks at 37 °C. Most of the resin composites showed the highest gloss and staining resistances when the fine silicone diamond polishing point was used. The results of this study suggested that there are differences in the gloss and the color changes depending on the filler type and the composition of the polishing materials.

DOI： 10.11480/jmds.550101

CiNii Books

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Language：Japanese   Publisher：(一社)日本歯科理工学会  

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Language：Japanese   Publisher：(公社)日本補綴歯科学会  

CiNii Books

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Language：Japanese   Publisher：(公社)日本補綴歯科学会  

CiNii Books

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Language：Japanese   Publisher：(公社)日本補綴歯科学会  

CiNii Books

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Language：Japanese   Publisher：(公社)日本補綴歯科学会  

CiNii Books

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Language：Japanese   Publisher：(株)ヒョーロン・パブリッシャーズ  

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Language：Japanese   Publisher：(公社)日本補綴歯科学会  

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Language：Japanese   Publisher：(公社)日本補綴歯科学会  

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Language：Japanese   Publisher：(公社)日本補綴歯科学会  

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