三种不同嵌体修复材料断裂韧性的对比研究

发布时间：2018-04-18 07:01

本文选题：Lava~(TM) + Ultimate　；参考：《南昌大学》2017年硕士论文

【摘要】：背景:牙科陶瓷生物性极佳,而且耐腐蚀性、耐酸碱性良好,同时具有突出的美学性能,备受医生和患者的推崇。但与合金、树脂、以及其他高分子嵌体材料相比,陶瓷的弯曲强度,断裂韧性均较低。陶瓷材料最致命的弱点就是脆性大、易碎。陶瓷本身所固有的脆性,制约其进一步的应用和发展。改善陶瓷材料的脆性,提高其断裂韧性一直是国内外陶瓷研究的热点。2015年,美国3M公司发布了全球首款CAD/CAM Restorative纳米复合陶瓷-LavaTM Ultimate优韧瓷,LavaTM Ultimate优韧瓷因含有80wt%(65vol%)预聚合纳米陶瓷颗粒,而被认为是具有极佳韧性的新型牙科陶瓷修复材料。断裂韧性是指材料抵抗裂纹扩展的能力,是表征材料脆性的唯一指标,也是陶瓷最重要的力学性能指标。较低的断裂韧性值,降低了陶瓷修复体临床应用的可靠性,因为断裂韧性值反映了由一个(临界)微缺陷引起的不可逆性损坏时临界应力强度水平。因此,每一个新的牙科陶瓷修复材料在被临床广泛应用之前都应进行测试,测试其断裂韧性值。目的:本实验拟用LavaTM Ultimate优韧瓷与Ceramage聚合瓷、IPS e.max Press铸瓷这两种临床上较常用的嵌体修复材料进行硬度及断裂韧性的比较研究。为LavaTM Ultimate优韧瓷成为新一代嵌体修复材料在临床上广泛应用提供一定的理论依据。材料和方法:1.试件制作与分组:按不同的材料分,各为两组,总共6组:LavaTM Ultimate优韧瓷组(圆柱形组,长方体组)、Ceramage聚合瓷组(圆柱形组,长方体组)、IPS e.max Press铸瓷组(圆柱形组,长方体组)。按厂商推荐的方法,由加工厂分别完成以上三种材料试件的制作,制作成厚度为2.0mm、直径为15.0mm的圆柱形试件以及长为15.0mm、宽为1.25mm,高为2.5mm的长方体试件。每组6个试件块。2.实验测定:压痕法测试硬度:利用数显维氏硬度实验机分别在三组圆柱形试件18个样品实验表面制造压痕。将试件放置于两面相对夹角为136度正四棱锥形金刚石压头下,加以载荷98N,保压时间15秒,每个试件在不同位置测5个点。倒置金相显微镜下观察测量试件实验表面产生的压痕的两条对角线长度,每个压痕测2条对角线长度,求其平均值。按公式计算每一个试件的硬度值。三点弯曲试验测试断裂韧性:对三组18个长方体试件先行线性切割预制裂纹,再在微机控制电子式万能试验机上完成三点弯曲试验,记录每一组试件断裂时的最大载荷值。再按公式计算每一个试件的断裂韧性值。3.数据分析:本实验所得的数据用SPSS Statistics 17.0统计软件。首先对三组试件数据分别进行非参数检验→单个样本K-S检验,得出三组试件数据均符合正态分布,然后进行可疑数据的舍弃,再采用单因素方差分析三种不同嵌体修复材料的硬度值和断裂韧性值,如果存在显著性差异再用Tukey HSD检验对3组均数进行两两比较。检验水准α=0.05,p0.05认为有统计学意义。结果:1.对三种不同嵌体修复材料的硬度值进行统计学分析,结果显示:LavaTM Ultimate优韧瓷组、Ceramage聚合瓷组、IPS e.max Press铸瓷组的硬度值之间的差异有统计学意义(p0.05)。2.对三种不同嵌体修复材料的断裂韧性值进行统计学分析,结果显示:LavaTM Ultimate优韧瓷组、Ceramage聚合瓷组、IPS e.max Press铸瓷组的断裂韧性值之间的差异有统计学意义(p0.05)。3.Tukey HSD检验对3组的硬度值均数和断裂韧性值均数进行组间两两比较。结果显示:硬度值两两比较均有显著性差异(p0.05),断裂韧性值两两比较也均有显著性差异(p0.05)。结论:1.IPS e.max Press组的硬度值最大,LavaTM Ultimate组其次,Ceramage组的硬度值最小;2.Ceramage组的断裂韧性值最大,Lava TM Ultimate组其次,IPS e.max Press组的断裂韧性值最小。
[Abstract]:Background: dental ceramic biological and excellent corrosion resistance, good acid and alkali resistance, also has the aesthetic performance outstanding, highly respected doctors and patients. But with the alloy, resin and other polymer inlay material than the flexural strength fracture toughness of ceramics, ceramic materials are relatively low. The most fatal weakness is brittle large, fragile. The inherent brittle ceramics, restricting its application and development. Further improve the brittleness of ceramic materials to improve the fracture toughness of ceramics at home and abroad has been the research hotspot in.2015, the American 3M company released the world's first CAD/CAM Restorative Ultimate and -LavaTM nano composite ceramic LavaTM Ultimate excellent ductile ductile porcelain, porcelain due to the presence of 80wt% (65vol%) pre polymerization of nano ceramic particles, and is considered to be a new type of dental ceramic material with excellent toughness. The fracture toughness refers to the material to resist crack propagation energy Force is the only indicator of brittle materials, is also the most important ceramic mechanical properties. The fracture toughness of low value, reducing the reliability of ceramic restorations in clinical application, because the fracture toughness values reflected by a (critical) micro defects caused by irreversible damage when the critical stress intensity level so. And each new dental ceramic material was tested before should be widely used in clinical testing, the fracture toughness value. Objective: the purpose of this study was to use LavaTM Ultimate excellent toughness porcelain and Ceramage polymerization porcelain, comparative study of IPS E.Max Press ceramic of these two kinds of clinical common inlay material hardness and the fracture toughness is LavaTM. Ultimate you become a new generation of ductile porcelain inlay material widely used in clinic to provide certain theoretical basis. Materials and methods: 1. specimens and grouping: according to different materials, respectively The two group, a total of 6 groups: LavaTM Ultimate group (group A, Ren porcelain cuboid group), Ceramage group (group A, Ceramage cuboid group), IPS group (E.Max Press ceramic cylinder group, cuboid group). Methods according to the manufacturer's recommended, by the processing plant were completed in three samples making, made into a thickness of 2.0mm, 15.0mm and 15.0mm long cylindrical specimen diameter, width is 1.25mm, height is 2.5mm of the cuboid specimen. Each group of 6 specimens of.2. block experiment: indentation hardness test: the use of Vivtorinox digital hardness testing machine respectively in the three groups cylindrical specimens of 18 samples of experimental surface indentation. Place the specimen on opposite sides of an angle of 136 degrees is four pyramid shaped diamond indenter, to load 98N, the holding time of 15 seconds, each specimen in different positions measured 5 points. Observed under the inverted microscope measurement experiment surface the pressure The two diagonal length marks, each indentation measured 2 diagonal length, find the average. According to the formula of every specimen hardness. Three point bending tests of fracture toughness: three groups of 18 rectangular specimens to linear cutting crack, then in microcomputer control electronic universal testing machine on the completion of the three point bending test, each test group recorded maximum load values of the fracture. According to the calculation formula of fracture toughness of each specimen of the value of the.3. data analysis: the experimental data obtained by SPSS statistical software Statistics 17. The first of three groups of specimen data respectively by non parametric test, single sample K-S test, the three groups of specimen data accord with the normal distribution, and then abandon the suspicious data, and then uses the single factor variance analysis of three kinds of inlay material hardness and fracture toughness, if there are significant differences with T Ukey HSD test of the 3 groups were compared by 22. A =0.05 level test. P0.05 was considered statistically significant. Results: 1. of three different inlay materials hardness values were statistically analyzed, the results showed that LavaTM Ultimate excellent toughness porcelain group, Ceramage polymerization porcelain group, there was significant difference between IPS E.Max Press the hardness of the cast porcelain group (P0.05.2.) on three different restorative materials block fracture toughness values were statistically analyzed, the results showed that LavaTM Ultimate excellent toughness porcelain group, Ceramage polymerization porcelain group, there were statistically significant differences between the IPS E.Max Press ceramic fracture toughness value group (P0.05).3.Tukey HSD the test of the 3 groups were the number of hardness and fracture toughness values were compared between the 22 groups. The results showed that: 22 there were significant differences in hardness (P0.05), 22 also had significant difference. The value of fracture toughness (P0.05). The hardness value of 1.IPS E.Max Press group is the largest, followed by LavaTM Ultimate group, and the hardness value of Ceramage group is the smallest. The fracture toughness value of 2.Ceramage group is the largest, followed by Lava TM Ultimate group, and the fracture toughness value of IPS IPS group is the smallest.

【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：R783.1

【参考文献】