No abstract available.
Rubber* ; Wettability*

The purpose of this study was to evalute the effect of immersion disinfection on the dimensional stability of rubber impression materials. The metallic master model was made in order to simulate the intraoral arch form. Impressions were made from four impression materials (Exaflex, Extrude, Reprosil, Impregum-F) and immersed in three disinfectant solutions (Wydex, Vi-Pon, Potadine). Casts from the impressions were measured according to the interpreparation distance. The A-B and The B-D abutment distance were compared with the control group and disinfected groups. The results were as follows; 1. The measurements of the stone cast increased relative to the master model and there was a significant difference (P<0.05). 2. The relative dimensional change of the stone cast as compared with master model ranged from 0.10% to 0.56% in the A-B distance and ranged from 0.04% to 0.27% in the B-D distance. 3. The dimensional change of the disinfected groups as compared with the control group was significantly different in the three impression materials except for Impregum-F (P<0.05). 4. The relative dimensional change of the disinfected groups compared with the control group ranged from 0% to 0.20% in the A-B distance and ranged from -0.09% to 0.11% in the B-D distance. These results suggest that immersion disinfection of rubber impression materials by chemical disinfectants causes very small dimensional change and the change is clinically acceptable for prothesis fabrication
Disinfectants ; Disinfection* ; Immersion* ; Rubber*

No abstract available.
Eczema* ; Hand* ; Rubber*

No abstract available.
Hemorrhage* ; Hemorrhoids* ; Ligation* ; Rubber*

No abstract available.
Hemorrhoidectomy* ; Hemorrhoids* ; Ligation* ; Rubber*

No abstract available.
Blister* ; Nevus* ; Rubber*

No abstract available.
Blister* ; Nevus* ; Rubber*

The purpose of this study was to compare surface roughness and morphologic changes after use of various plaque control devices to titanium implant surfaces. The study materials were 6 ITI titanium implants(Bonefit(R)) and 5 plaque control devices. 6 implants were divided into 6 different groups and instrumented by each plaque control devices as follows. 1) Group I : untreated control 2) Group II : Titanium curette(Titanium curette(R), 3i) 80 vertical/horizontal strokes 3) Group III : Plastic curette(Implacare(R), Hu-Friedy) 80 vertical/horizontal strokes 4) Group IV : Plastic tip-ultrasonic scaler(Amdent(R), Amdent) 160 seconds 5) Group V : Rotating interdental brush(Identobrush(R), Identoflex) 160 seconds 6) Group VI : Abrasive rubber cup polisher(Zircate(R), Prophy paste, Dentsply) 160 seconds. All specimens were prepared for evaluation by surface roughness tester, optical stereomicroscopy(OM) and scanning electron microscopy(SEM). The Ra and Rt mean values of the tested specimens were 1) Group I (Ra=0.170+/-0.007micrometer, Rt=1.297+/-0.016micrometer) 2) Group II (Ra=0.209+/-0.006micrometer, Rt=1.602+/-0.110micrometer) 3) Group III (Ra=0.179+/-0.001micrometer, Rt=1.429+/-0.055micrometer) 4) Group IV (Ra=0.182+/-0.005micrometer, Rt=1.511+/-0.085micrometer) 5) Group V (Ra=0.301+/-0.008micrometer, Rt=1.882+/-0.131micrometer) 6) Group VI (Ra=0.147+/-0.010micrometer, Rt=1.059+/-0.021micrometer) In Ra values, experimental group II, V, VI were statistically significant different when compared with control. OM and SEM observation showed that experimental group III, IV were minimal changes when compared with control and group VI was smoothest among other experimental groups. The results suggested that plastic curette and plastic tip-ultrasonic scaler were predictable devices to titanium implant surface.
Plastics ; Rubber ; Stroke ; Titanium*

Stomach ; Rubber ; Latex

The purpose of this study was to investigate and compare the biomechanical properties of orthodontic rubber elastic materials. Latex bands, nylon-covered elastic threads and polyurethane-based elastic modules, delivering 205 +/- 10 grams force at 30mm stretching state were selected and stored separately in 3 environments-air (22+/-3degreesC), distilled water (37+/-1degreesC), or natural saliva (37+/-1degreesC). And, the amount of remaining force and permanent elongation of each sample were measured on Instron at interval of 1 hour, 6 hours, 12 hours, 24 hours, 1 week, and 2 weeks. So the data derived were analyzed statistically. The results were as follows: 1. Force decay and permanent elongation of all materials increased with time lapsed; elastic module, latex band and nylon-covered elastic thread in that order of the amount of force decay; elastic module, elastic thread, latex band in that order of the amount of permanent elongation. 2. Among environmental conditions, force decay and permanent elongation in natural saliva, most increased, and those in air, least increased. 3. There was a negative correlation between force decay and permanent elongation. 4. Force decay and permanent elongation were most affected by the material itself, time and environments in that order. 5. After 24 hours in saliva, the percentage of remaining force in elastic module was 51.9% (107.37grams); in latex band, 83.2%(172.62grams); in elastic thread, 85.0%(179.25grams). After 2 weeks in saliva, the percentage of remaining force in elastic module was 42.9%(88.75grams); in latex band, 74.5%(154.50grams); in elastic thread, 77.6%(163.75grams).
Latex ; Rubber* ; Saliva ; Water