论文部分内容阅读
目的探讨金属基底冠厚度对纳米陶瓷金瓷冠和普通陶瓷金瓷冠在耐压力方面的影响。方法用车床加工一个模拟前磨牙预备体的金属代型,再研磨加工出五种厚度(0.2mm、0.4mm、0.6mm、0.8mm、1.0mm)的基底冠,各10个,将同一厚度的基底冠随机分为两组,每组5个,分别对应A-E的纳米陶瓷组和A’-E’的普通陶瓷组。各组分别熔附相应的陶瓷材料,整个瓷层的厚度为1.0mm。用Instron万能材料实验机,直径6 mm的球状压头置于试件牙合面中心,以1mm/min的速度加压至瓷层崩裂,记录数值,进行统计分析。结果①组内比较结果:A-E各组之间存在显著性差异(P<0.01);A’-E’各组之间也存在显著性差异(P<0.01);②组间比较结果:A组与A’组无显著差异(P>0.05),而B组与B’组、C组与C’组、D组与D’组、E组与E’组均有显著性差异(P<0.01)。结论①瓷层厚度一定时,随基底冠厚度的增加,纳米陶瓷各组和普通陶瓷各组的耐压力均增高。基底冠厚度为0.2 mm组的耐压力最小,1.0 mm组的耐压力最大。②基底冠厚度相同时,纳米陶瓷各组的耐压力较普通陶瓷各组高。
Objective To investigate the effect of metal base crown thickness on the pressure resistance of nano-ceramic porcelain crowns and common ceramic porcelain crowns. Methods A metal mimic precast body was prepared by lathe machining. Five kinds of basal crowns (0.2mm, 0.4mm, 0.6mm, 0.8mm, 1.0mm) The basilar crowns were randomly divided into two groups of 5 in each group, corresponding to AE ceramic nanocomposites and A’-E ’ceramic autoclaves, respectively. Each group were fused with the corresponding ceramic materials, the thickness of the entire porcelain layer is 1.0mm. With Instron universal material testing machine, 6 mm in diameter ball indenter placed in the center of the occlusal surface of the specimen, pressed at a speed of 1 mm / min until the porcelain layer was cracked, and the values recorded for statistical analysis. Results ① In-group comparison results showed that there was significant difference between AE groups (P <0.01); there was also significant difference between A’-E ’groups (P <0.01); ②Comparison between groups: (P <0.05). There was significant difference between group B and B ’, group C and C’, group D and D ’, group E and E’ (P <0.01) ). Conclusion ① When the thickness of the porcelain layer is constant, with the increase of the basement cap thickness, the pressure resistance of each group of nano-ceramics and ordinary ceramics is increased. The pressure resistance of the group 0.2 mm at the base crown is the smallest, and the pressure resistance at the 1.0 mm group is the largest. ② the same base crown thickness, the pressure resistance of each group of ceramic nano-ceramic higher than the average of each group.