發(fā)布時(shí)間：2018-04-18 07:01

  本文選題：Lava~(TM) + Ultimate　； 參考：《南昌大學(xué)》2017年碩士論文

【摘要】：背景:牙科陶瓷生物性極佳,而且耐腐蝕性、耐酸堿性良好,同時(shí)具有突出的美學(xué)性能,備受醫(yī)生和患者的推崇。但與合金、樹(shù)脂、以及其他高分子嵌體材料相比,陶瓷的彎曲強(qiáng)度,斷裂韌性均較低。陶瓷材料最致命的弱點(diǎn)就是脆性大、易碎。陶瓷本身所固有的脆性,制約其進(jìn)一步的應(yīng)用和發(fā)展。改善陶瓷材料的脆性,提高其斷裂韌性一直是國(guó)內(nèi)外陶瓷研究的熱點(diǎn)。2015年,美國(guó)3M公司發(fā)布了全球首款CAD/CAM Restorative納米復(fù)合陶瓷-LavaTM Ultimate優(yōu)韌瓷,LavaTM Ultimate優(yōu)韌瓷因含有80wt%(65vol%)預(yù)聚合納米陶瓷顆粒,而被認(rèn)為是具有極佳韌性的新型牙科陶瓷修復(fù)材料。斷裂韌性是指材料抵抗裂紋擴(kuò)展的能力,是表征材料脆性的唯一指標(biāo),也是陶瓷最重要的力學(xué)性能指標(biāo)。較低的斷裂韌性值,降低了陶瓷修復(fù)體臨床應(yīng)用的可靠性,因?yàn)閿嗔秧g性值反映了由一個(gè)(臨界)微缺陷引起的不可逆性損壞時(shí)臨界應(yīng)力強(qiáng)度水平。因此,每一個(gè)新的牙科陶瓷修復(fù)材料在被臨床廣泛應(yīng)用之前都應(yīng)進(jìn)行測(cè)試,測(cè)試其斷裂韌性值。目的:本實(shí)驗(yàn)擬用LavaTM Ultimate優(yōu)韌瓷與Ceramage聚合瓷、IPS e.max Press鑄瓷這兩種臨床上較常用的嵌體修復(fù)材料進(jìn)行硬度及斷裂韌性的比較研究。為L(zhǎng)avaTM Ultimate優(yōu)韌瓷成為新一代嵌體修復(fù)材料在臨床上廣泛應(yīng)用提供一定的理論依據(jù)。材料和方法:1.試件制作與分組:按不同的材料分,各為兩組,總共6組:LavaTM Ultimate優(yōu)韌瓷組(圓柱形組,長(zhǎng)方體組)、Ceramage聚合瓷組(圓柱形組,長(zhǎng)方體組)、IPS e.max Press鑄瓷組(圓柱形組,長(zhǎng)方體組)。按廠商推薦的方法,由加工廠分別完成以上三種材料試件的制作,制作成厚度為2.0mm、直徑為15.0mm的圓柱形試件以及長(zhǎng)為15.0mm、寬為1.25mm,高為2.5mm的長(zhǎng)方體試件。每組6個(gè)試件塊。2.實(shí)驗(yàn)測(cè)定:壓痕法測(cè)試硬度:利用數(shù)顯維氏硬度實(shí)驗(yàn)機(jī)分別在三組圓柱形試件18個(gè)樣品實(shí)驗(yàn)表面制造壓痕。將試件放置于兩面相對(duì)夾角為136度正四棱錐形金剛石壓頭下,加以載荷98N,保壓時(shí)間15秒,每個(gè)試件在不同位置測(cè)5個(gè)點(diǎn)。倒置金相顯微鏡下觀察測(cè)量試件實(shí)驗(yàn)表面產(chǎn)生的壓痕的兩條對(duì)角線長(zhǎng)度,每個(gè)壓痕測(cè)2條對(duì)角線長(zhǎng)度,求其平均值。按公式計(jì)算每一個(gè)試件的硬度值。三點(diǎn)彎曲試驗(yàn)測(cè)試斷裂韌性:對(duì)三組18個(gè)長(zhǎng)方體試件先行線性切割預(yù)制裂紋,再在微機(jī)控制電子式萬(wàn)能試驗(yàn)機(jī)上完成三點(diǎn)彎曲試驗(yàn),記錄每一組試件斷裂時(shí)的最大載荷值。再按公式計(jì)算每一個(gè)試件的斷裂韌性值。3.數(shù)據(jù)分析:本實(shí)驗(yàn)所得的數(shù)據(jù)用SPSS Statistics 17.0統(tǒng)計(jì)軟件。首先對(duì)三組試件數(shù)據(jù)分別進(jìn)行非參數(shù)檢驗(yàn)→單個(gè)樣本K-S檢驗(yàn),得出三組試件數(shù)據(jù)均符合正態(tài)分布,然后進(jìn)行可疑數(shù)據(jù)的舍棄,再采用單因素方差分析三種不同嵌體修復(fù)材料的硬度值和斷裂韌性值,如果存在顯著性差異再用Tukey HSD檢驗(yàn)對(duì)3組均數(shù)進(jìn)行兩兩比較。檢驗(yàn)水準(zhǔn)α=0.05,p0.05認(rèn)為有統(tǒng)計(jì)學(xué)意義。結(jié)果:1.對(duì)三種不同嵌體修復(fù)材料的硬度值進(jìn)行統(tǒng)計(jì)學(xué)分析,結(jié)果顯示:LavaTM Ultimate優(yōu)韌瓷組、Ceramage聚合瓷組、IPS e.max Press鑄瓷組的硬度值之間的差異有統(tǒng)計(jì)學(xué)意義(p0.05)。2.對(duì)三種不同嵌體修復(fù)材料的斷裂韌性值進(jìn)行統(tǒng)計(jì)學(xué)分析,結(jié)果顯示:LavaTM Ultimate優(yōu)韌瓷組、Ceramage聚合瓷組、IPS e.max Press鑄瓷組的斷裂韌性值之間的差異有統(tǒng)計(jì)學(xué)意義(p0.05)。3.Tukey HSD檢驗(yàn)對(duì)3組的硬度值均數(shù)和斷裂韌性值均數(shù)進(jìn)行組間兩兩比較。結(jié)果顯示:硬度值兩兩比較均有顯著性差異(p0.05),斷裂韌性值兩兩比較也均有顯著性差異(p0.05)。結(jié)論:1.IPS e.max Press組的硬度值最大,LavaTM Ultimate組其次,Ceramage組的硬度值最小;2.Ceramage組的斷裂韌性值最大,Lava TM Ultimate組其次,IPS e.max Press組的斷裂韌性值最小。
[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.

【學(xué)位授予單位】：南昌大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：R783.1

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本文編號(hào)：1767287