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증기압 멸균 소독에 의한 치과용 석고의 물성변화

Other Titles
 Effect of Physical Properties of Dental Stones by Autoclave 
 김연웅  ;  이용근  ;  정경호  ;  조리라  ;  김경남  ;  김광만 
 Journal of the Korean Research Society for Dental Materials (대한치과기재학회지), Vol.30(1) : 55-62, 2003 
Journal Title
Journal of the Korean Research Society for Dental Materials(대한치과기재학회지)
Issue Date
stone ; autoclave ; setting expansion ; compressive strength ; surface roughness
stone ; autoclave ; setting expansion ; compressive strength ; surface roughness
Gypsum products have potential contamination by infectious human pathogens, which could be transmitted from patient to the gypsum model via impression materials. Therefore disinfection and sterilization of gypsum products are recommended. Steam
sterilization: namely autoclaving is widely available in dentistry. The aim of this study was to investigate degradation of mechanical properties for dental gypsum after steam sterilization. The effect of autoclaving on compressive strength, weight loss
and dimensional accuracy of specimens of commercial die stone such as Crystal Rock(CR : Maruishi), Die Keen(DK : Columbus Dental), Resin Rock(RR : Whip Mix), Tuff Rock(TR : Talladium) were estimated, and experimental gypsums{(EP) : 0.5wt% accelerator,
0.02wt% retarder, 0.1wt% surface agent, 0.1wt% Poly Vinyl Acetate} were also measured the above properties after autoclaving. For each group, five cylindrical(6mm in diameter and 12mm long) specimens made with manufactures water:powder ratio. All
specimens were dried in oven until reaching the constant mass. After dried, they were autoclaved at 12 degrees C for 20 minute, dried again. Compressive strength was measured before and after autoclaving using mechanical testing machine at a cross-head
speed of 0.5mm/min. The dimensional accuracy was estimated by length change of specimens with digital caliper before and after autoclaving. For statistical analysis, ANOVA Tukeys Studentized Range (HSD) test and T test were used. Compressive strength
and weight were decreased in all samples after autoclaving. There is significant difference between CR, DK and RR, TR in after autoclaving(p<0.05). EP exhibited the highest compressive strength after autoclaving. The weight was significantly decreased
in all group except RR after autoclaving(p<0.05). The dimensional accuracy was not significantly increased in all group except CR. As this result, we found that resin-containing dental stone is more appropriate for autoclaving in dentistry.
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2. College of Dentistry (치과대학) > Dept. of Dental Biomaterials and Bioengineering (치과생체재료공학교실) > 1. Journal Papers
Yonsei Authors
Kim, Kwang Mahn(김광만) ORCID logo https://orcid.org/0000-0002-5235-0294
Lee, Yong Keun(이용근)
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