석고 모형재와 고무인상재의 젖음성이 지르코니아 코핑의 변연적합도에 미치는 영향

Abstract

Purpose: This study examined the effect of wettability of gypsum materials and rubber impression material on the marginal fitness of zirconia copings. Methods: Three commercially available gypsum materials(Fugirock EP, Snow Rock, Tuff Rock) and three zirconia blocks(iJAM Emerald, LUXEN Smile block, ICE Zirkon transluzent) were studied. The zirconia copings were fabricated by using dental CAD/CAM system. Contact angles on the impression materials were measured with contact angle measuring device. Silicone replica method was used to measure the marginal fitness and cutting was performed on the bucco-lingual and mesio-distal sides. It were observed with a stereomicroscope at &#x00B0;&#x00F8;40 magnification. The data were statistically analyzed with One-way ANOVA. Results: Mean values of contact angles were <TEX>$58.3{\pm}0.7^{\circ}$</TEX> for Tuff Rock, <TEX>$77.5{\pm}0.5^{\circ}$</TEX> for Fugirock EP and <TEX>$87.8{\pm}0.5^{\circ}$</TEX> for Snow Rock and the difference between them was statistically significant(p<0.05). The smallest values of marginal fitness for the JF groups were <TEX>$30.7{\pm}3.0{\mu}m$</TEX> for bucco-lingual direction, <TEX>$29.3{\pm}3.0{\mu}m$</TEX> for mesio-distal direction. One-way ANOVA showed statistically significant difference between groups for marginal fitness(p<0.05). Conclusion: Tuff rock gypsum material had superior wettability to others. The mean marginal fitness of the Tuff rock gypsum material group were significantly better than other groups. Thus they can be also expected to show clinically satisfactory marginal fitness.