3D 프린팅법으로 제작한 브리지 패턴의 내면 적합도
Internal fit of bridge patterns fabricated by a 3D printing technique
김시철, 한민수, 최범진, 이충재, 이해형,
소속 상세정보
김시철 ( Kim Si-Chul ) - 단국대학교 치과대학 생체재료학교실
한민수 ( Han Min-Soo ) - 혜전대학교 치기공과
최범진 ( Choi Beom-Jin ) - 단국대학교 치과대학 생체재료학교실
이충재 ( Lee Chung-Jae ) - 신한대학교 치기공학과
이해형 ( Lee Hae-Hyoung ) - 단국대학교 조직재생공학연구소
KMID : 1035320140410040239
Abstract
The purpose of this study was to compare the marginal and internal fit of resin bridge patterns fabricated by a 3D printer system. Three type bridge models (2-, 3-, 4-unit bridge) were prepared with die stone and two types of margin, knife or chamfer were applied to the abutment teeth. The gypsum models were used to fabricate resin patterns by a 3D printer. The printed resin patterns were fixed to their master dies using zinc phosphate cement and then invested with dental stone in a box. The resin patterns were cut mesiodistally using a diamond saw and further polished with #1000 SiC paper. Internal fit of the bridge patterns was measured at areas of marginal opening (MO), marginal gap (MG) of maximum curvature area, axial gap (AG), and occlusal gap (OG) from the images of gaps captured by a stereoscope with CCD camera. Overall, mean gap dimensions of the resin patterns prepared in this study were <155 μm, except for OG. The 3D bridge patterns with chamfer margin showed a significantly higher adaptation accuracy at MO, but those with knife margin showed a better accuracy at MG. Internal fit of all patterns at AG were found to be <50 μm.
키워드
3D printing; bridge pattern; margin type; internal fit; dental casting
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