Influence of finish line design on marginal adaptation of electroformed metal-ceramic crowns
Influence of finish line design on marginal adaptation of electroformed metal-ceramic crowns
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DOI：
10.1016/j.prosdent.2006.01.009
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发表时间：
2006-03-01
影响因子：
4.6
通讯作者：
Matsumura, H
中科院分区：
文献类型：
--
作者：
Shiratsuchi, H;Komine, F;Matsumura, H
问题陈述。金色电铸金瓷修复体作为传统金瓷修复体的替代品已得到推广。然而，对于牙体预备设计和边缘适合性之间的关系，我们知之甚少。目的。本研究评估了3种不同的终止线设计对电铸金属冠冠和金瓷全冠边缘适合性的影响。材料和方法。为上颌中切牙冠准备了3种钢模，分别为肩部、圆形肩部和深倒角。每组制作8个标准电铸金瓷全冠。在激光显微镜下，在4个部位(唇面、近中面、舌面和远端面，每个点15点)沿周缘测量每个标本60个点的边缘差异。采用Kruskal-Wallis检验和带Bonferroni校正的Malin-Whitney U检验对3组间的数据进行统计学分析。用t-Wilcoxon符号列检验(a=0.05)估计前后的边际差异。Z：1结果。未烤瓷冠和金属烤瓷冠的边缘差值在各组间均有显著差异。最小差异值的最低范围(P
Statement of problem. Gold electroformed metal-ceramic restorations have been promoted as alternatives to conventional metal-ceramic restorations. However, little is known about the relationship between tooth preparation design and marginal adaptation for this type of crown. Purpose. This study evaluated the influence of 3 different finish line designs on the marginal adaptation of electroformed metal copings and metal-ceramic crowns. Material and methods. Three steel dies were prepared for maxillary central incisor crowns with 3 finish line designs: shoulder, rounded shoulder, and deep chamfer preparations. Eight standardized electroformed metal-ceramic crowns were fabricated for each group. Marginal discrepancies were measured at 60 points for each specimen along the circumferential margin at 4 sites (labial, mesial, lingual, and distal Surfaces, with 15 points for each site) before and after firing procedures using a laser microscope. Data among the 3 different groups were statistically analyzed using the Kruskal-Wallis test and the Malin-Whitney U test with the Bonferroni correction. Marginal discrepancies between prefiriiigaiidpostfiriiigproccdtircsxN,cre evaluated usingthcWilcoxon signed-ranks test (a=.05). z:1 Results. Significant differences in the marginal discrepancies ofc1cctroformcd metal copings without porcelain and inetal-ccramic crowns were found arriong all groups. The lowest range ofmcclian rriarginal discrepancy values (P