탄성고무인상재에 따른 초경석고 모형의 정밀도에 관한 연구
ACCURACY OF IMPROVED STONE CASTS FROM ELASTOMERIC IMPRESSION MATERIALS
김기홍, 장익태, 임순호,
소속 상세정보
김기홍 ( Kim Ki-Hong ) - 서울대학교 치과대학 치과보철학교실
장익태 ( Chang Ik-Tae ) - 서울대학교 치과대학 치과보철학교실
임순호 ( Yim Soon-Ho ) - 성균관대학교 의과대학
KMID : 0362419990370030301
Abstract
The purpose of this study was to compare the accuracy of currently used elastomeric impression materials for complete arch impression taking. Five elastomers (Impregum, Permlastic, Express, Extrude, Examix) and one Irreversible hydrocolloid (Aroma-fine) were tested. For each material, 5 impressions were made of stainless steel model to which five tapered posts were attached. Custom trays were used for polyether and polysulfide impression materials, and putty/wash two step technique was used for addition polyvinylsiloxane impression materials. Improved stone models were poured to all impressions. Accuracy of the materials was assessed by measuring ten distances on stone dies poured from impressions of the master model. All measurements for master and improved stone models were with three dimensional measuring machine. The results were as follows 1. The dimensional accuracy of polyether, extrude, and examix were significantly superior to polysulfide, exress, and alginate in reproducing full arch mode (p<0.05). 2. There were no statistical differences in dimensional accuracy for full arch impression between polyether, extrude and examix (p>0.05). 3. there were no statistical differences in dimensional accuracy between polysulfide, express, and alginate (p>0.05). 4. There were no statistical differences between addition polyvinyl siloxane materials (p>0.05). 5. There were no statistical differences between anterior-posterior and lateral dimensional changes of all impression materials (p>0.05).
키워드
Accuracy; Elastomers; Impression materials; Three dimensional measuring machine; improved stone
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