Biomedical subjects

E Miwa

Publications and source records attributed to E Miwa.

12 recordsLinked to original sources

PubMed1989

[Clinical study on the prognosis of complete denture wearers covering 10 years. 4. Masticatory efficiency].

The purpose of this study was to estimate masticatory efficiency of complete denture wearers. The subjects were 72 patients, treated before 5-10 years at students' clinic of Tsurumi University, School of Dental Medicine. The masticatory efficiencies with peanuts and Kamaboko were calculated. Results 1. The mean masticatory efficiency with peanuts for 63 patients was 35.8%, and with Kamaboko (steamed fishpast) for 64 patients was 94.5%, in comparison with natural dentition. 2. The mean masticatory efficiency with peanuts was 124.3%, and with Kamaboko was 99.6%, for complete denture wearers. 3. Comparing the measured value of masticatory efficiency with 5 to 10 years wearing period, there was significant difference in the masticatory efficiency between peanuts and Kamaboko. 4. There was significant difference in the masticatory efficiency with peanuts between the group needed new denture and the group not needed but there was not significant difference with Kamaboko.

Denture, Complete↗

PubMed1989

[Clinical evaluation of the metal-based denture using superplastic titanium alloy for upper edentulous patients].

The purpose of this study was to evaluate clinically superplastic titanium alloy for maxillary complete denture. The subjects that were the 30 patients with upper edentulous ridges were selected from Tsurumi University Dental Hospital. 17 patients were maxillary and mandibular edentulous, the other patients were only maxillary edentulous. Each of metal base was made of 90 Ti-6 Al-4 V alloy by Sankin Dental Co.. The portion of a resin was used of PMMA resin with 4-META (4-methacryloxyethyl trimellitic anhydride). At the time of inserting the denture and one month after, the dentures were clinically observed about the retentive force and the adhesive condition on finish line. At the same time, the patients were examined oral mucose and inquired of the feeling relating to wear new denture. Furthermore each weight of new dentures was compared with each of old dentures. The results were as following: 1. The width and depth of the palate were measured previously on posterior palatal sealed area. The mean value of the depth was 8.8 +/- 1.8 mm and the mean value of the width was 44.9 +/- 2.7 mm. 2. The retentive force of new dentures was clinically adequate enough to achievement of function without two cases. 3. The adhesive condition on the finish line was adequate in all cases. 4. The mean weight value of the new denture was 20.1 +/- 3.9 g. 5. 2 of 30 patients were finded the slightly redness without pain on the middle palatal mucose. 6. The feelings of patients relating to wear were as following: 1) Lighter than old denture. 2) More extensive tongue space.(ABSTRACT TRUNCATED AT 250 WORDS)

Dental Alloys↗

PubMed1989

[Development of a new system for measuring the mean film thickness of the white silicone on the fitness test of the denture base].

A new system is developed for measuring the mean film thickness of the white silicone on the fitness test of the denture base. This system is based on analysing the B/W film density replaced from the thickness of the silicone. The detective feature of this system is as follows: 1. An adequate correlation between the logarithm of the thickness of the white silicone and the logarithm of the B/W film density was estimated from the results of experimental values. 2. With use of the computer assembled into the system, it is capable to quickly process data. 3. Compared with the conventional method, the proper suggestion was gotten to the clinical data. 4. The system is available to use of investigating the bite force and the mean film thickness of the white silicone.

Bite Force↗

PubMed1989

[Solvent power of new denture cleaner for denture calculus and the influence of this cleaner on the denture materials].

In order to chemically remove the calculus adhering to a denture, new denture cleaner was prepared on an experimental basis. The principal ingredient of this solution was a chilating agent which contained the phosphoric acid. This study consisted of the fundamental and the clinical examinations of this solution the purpose of which was to test the solvent power of this solution on the calculus and to evaluate its influence on the denture materials and its effectiveness in clinical practice. 1. the fundamental study 1) method (1) The test for the solvent power of this solution. The powder of tricalcium phosphate (T.C.P. powder: Wakohjunyaku Co.) was substituted for the calculus adhering to a denture. (1) The influence of the solution temperature on the solvent power. The T.C.P. powder was dissolved at 20 degrees C, 30 degrees C, 40 degrees C, 50 degrees C and 60 degrees C temperature in 10 g of the solution within 10 minutes and the amount of dissolved powder was weighted. The time was measured with a stop watch (Seiko Co.) until 0.5 g of T.C.P. powder had been dissolved in 10 g of the solution. (2) The effect of using it with an ultrasonic cleaner. The time to dissolve 0.1 g of T.C.P. powder in 10 g of this solution was compared with that of the 15% EDTA solution. The measurement was repeated 5 times and the arithmetic mean of the 5 sample values was calculated in order to show the experimental results. The room temperature was 19 +/- 2 degrees C, the humidity was 56 +/- 3%. (2) The influence of this solution on the denture materials. (1) resin specimen. In order to test the transverse strength, transverse deflection, Young's modulus and Knoop hardness, resin specimens were processed in the manner specified in I.S.O. 1567. The data were compared the resin specimens steeped in this solution and with the control sample that was steeped in water. The specimens were immersed up to 24 hours. Furthermore the existence of tarnish was observed with a 40 times microscope. (2) metal specimen. In order to test the corrosion, metal specimens were produced according to the manner of a corrosion test. The metal specimens were held vertically and the end immersed to 20 mm in this solution for 24 hours and 120 hours each. After steeping, each specimen was measured for loss in weight. The data were calculated as the loss in weight per hour (mg/cm) and the depth of corrosion per year (mm/yr).(ABSTRACT TRUNCATED AT 400 WORDS)

Corrosion↗

PubMed1987