本文關(guān)鍵詞： 口腔修復(fù)材料 摩擦磨損實(shí)驗(yàn) 耐磨損性能 釉質(zhì) 牙本質(zhì)　出處：《華北理工大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：目的選用四種口腔常用修復(fù)材料,在體外與天然牙釉質(zhì)及牙本質(zhì)進(jìn)行摩擦磨損實(shí)驗(yàn),研究口腔修復(fù)材料與天然牙釉質(zhì)、牙本質(zhì)之間磨損性能的匹配情況,為臨床選擇修復(fù)體提供適當(dāng)參考和實(shí)驗(yàn)依據(jù)。方法以未磨耗的天然牙釉質(zhì)、牙本質(zhì)牙尖為研究對(duì)象,以高度拋光的聚合瓷、玻璃陶瓷、氧化鋯、純鈦為摩擦副。釉質(zhì)組分為對(duì)照組、實(shí)驗(yàn)組,對(duì)照組為釉質(zhì)牙尖與釉質(zhì)對(duì)磨,實(shí)驗(yàn)組為牙尖分別與四種材料對(duì)磨;牙本質(zhì)分組同釉質(zhì)組。利用微摩擦磨損實(shí)驗(yàn)機(jī),垂直向載荷15N,摩擦運(yùn)動(dòng)方式為往復(fù)運(yùn)動(dòng),循環(huán)次數(shù)6000次,位移1mm,頻率2HZ,使釉質(zhì)、牙本質(zhì)分別與聚合瓷、玻璃陶瓷、氧化鋯、純鈦對(duì)磨,經(jīng)處理得出摩擦系數(shù)等參數(shù)的變化曲線。采用掃描電鏡觀察牙尖及材料磨損前后的表面形貌,粗糙度儀測(cè)牙釉質(zhì)、牙本質(zhì)及材料的粗糙度,HVS-50Z型自動(dòng)轉(zhuǎn)塔數(shù)顯維氏硬度儀測(cè)釉質(zhì)、牙本質(zhì)及材料的表面硬度,電子天平測(cè)釉質(zhì)、牙本質(zhì)牙尖摩擦實(shí)驗(yàn)后的質(zhì)量損失量。結(jié)果1摩擦實(shí)驗(yàn)后,電鏡下釉質(zhì)牙尖表面顯微形貌皆有劃痕及脫落顆粒出現(xiàn),其中釉質(zhì)對(duì)照組、玻璃陶瓷組及純鈦組牙尖表面出現(xiàn)大量碎屑及疲勞裂紋,聚合瓷組牙尖表面較光滑,氧化鋯組牙尖表面磨損嚴(yán)重,有犁溝存在。通過spss17.0對(duì)實(shí)驗(yàn)組及對(duì)照組實(shí)驗(yàn)后釉質(zhì)牙尖的磨損量進(jìn)行分析,實(shí)驗(yàn)組與對(duì)照組具有統(tǒng)計(jì)學(xué)差異(p=0.000,0.05),即四種材料及對(duì)照組對(duì)釉質(zhì)牙尖造成的磨損量不完全相同。對(duì)實(shí)驗(yàn)組各組牙尖質(zhì)量損失量與材料硬度之間進(jìn)行關(guān)聯(lián)性分析(r=0.979,0.8,P=0.004,0.05),相關(guān)性顯著,可以看出硬度和質(zhì)量損失量間具有高度正相關(guān)性,即隨著硬度的增加,質(zhì)量損失量也增加。其中釉質(zhì)與玻璃陶瓷對(duì)磨后的磨損量與釉質(zhì)對(duì)照組最接近。2摩擦實(shí)驗(yàn)后,電鏡下牙本質(zhì)牙尖表面顯微形貌皆有劃痕及脫落顆粒出現(xiàn),其中牙本質(zhì)對(duì)照組、聚合瓷組牙尖表面可見變形的牙本質(zhì)小管形態(tài),玻璃陶瓷組、純鈦組、氧化鋯組牙尖表面磨損嚴(yán)重,牙本質(zhì)小管不可見,磨損區(qū)有大量碎屑及犁溝存在。通過spss17.0對(duì)實(shí)驗(yàn)組及對(duì)照組實(shí)驗(yàn)后牙本質(zhì)牙尖的磨損量進(jìn)行分析,實(shí)驗(yàn)組與對(duì)照組具有統(tǒng)計(jì)學(xué)差異(p=0.000,0.05),即四種材料及對(duì)照組對(duì)牙本質(zhì)牙尖造成的磨損量不完全相同;對(duì)實(shí)驗(yàn)組各組牙尖質(zhì)量損失量與材料硬度之間進(jìn)行關(guān)聯(lián)性分析(r=0.846,0.8,P=0.147,0.05),相關(guān)性顯著,硬度和質(zhì)量損失間有高度正向趨勢(shì),即隨著硬度的增加,質(zhì)量損失量有一定程度增加。其中牙本質(zhì)與玻璃陶瓷對(duì)磨后的磨損量與牙本質(zhì)對(duì)照組最接近。結(jié)論不同材料均會(huì)對(duì)釉質(zhì)、牙本質(zhì)造成不同程度的磨耗,從磨損形貌、材料硬度及質(zhì)量損失分析材料的耐磨性,玻璃陶瓷的耐磨性與釉質(zhì)的性能相匹配,聚合瓷的耐磨性與牙本質(zhì)的性能相匹配。因此臨床對(duì)頜天然牙釉質(zhì)存在的,修復(fù)體宜選用玻璃陶瓷作為其修復(fù)材料;對(duì)頜天然牙本質(zhì)暴露的,修復(fù)體宜選用聚合瓷作為其修復(fù)材料。
[Abstract]:Objective to study the matching of wear properties between dental restorative materials and natural enamel and dentin in vitro by friction and wear experiments with natural enamel and dentin. Methods the unworn natural enamel and dentin cusp were used as the research objects, and the highly polished polymerized porcelain, glass ceramics and zirconia were used. Pure titanium was friction pair. The enamel group was divided into control group, experimental group, the control group was enamel cusp and enamel grinding, the experimental group was tooth tip and four kinds of materials respectively. The dentin was divided into the same enamel group. Using the micro-friction and wear test machine, the vertical load was 15N, the friction movement mode was reciprocating motion, the number of cycles was 6000 times, the displacement was 1mm and the frequency was 2HZ, so that the enamel could be made. Dentin and polymeric porcelain, glass ceramics, zirconia and pure titanium were ground, and the friction coefficient was obtained. The surface morphology of tooth tip and material before and after wear was observed by scanning electron microscope (SEM). The roughness of tooth enamel, dentin and material were measured by rough degree instrument. The enamel was measured by HVS-50Z automatic turret, the surface hardness of dentin and material was measured by electronic balance, and the enamel was measured by electronic balance. Results 1 after the friction test, there were scratches and exfoliated particles on the surface of enamel cusp under electron microscope, including enamel control group. A large number of debris and fatigue cracks appeared on the cusp surface of vitreous ceramics group and pure titanium group. The surface of cusp of polymerized porcelain group was smooth, and that of zirconia group was serious. There were ploughing furrows. The wear amount of enamel cusp in experimental group and control group was analyzed by spss17.0. The difference between experimental group and control group was statistically significant (P < 0.05). Four kinds of materials and the control group did not cause the same amount of wear on the enamel cusp. The relationship between the weight loss of the tooth tip and the hardness of the material in each group of experimental group was analyzed. The correlation between hardness and mass loss is highly positive, that is, with the increase of hardness. The wear amount of enamel and glass ceramics was the closest to that of enamel control group. 2. After friction experiment, there were scratches and shedding particles on the surface of dentin cusp under electron microscope. In the dentin control group, the dentine tubules were deformed on the surface of the dental tip in the polymerized porcelain group, and the surface wear was serious in the vitreous ceramic group, pure titanium group and zirconia group, and the dentin tubules were not visible. There were a large number of debris and ploughs in the wear zone. The wear amount of dentin cusps in experimental group and control group was analyzed by spss17.0. There was a statistical difference between the experimental group and the control group (P < 0.05), that is, the four kinds of materials and the control group did not cause the same amount of attrition on the cusps of dentin. The correlation analysis between the weight loss of the tooth tip and the hardness of the material in each group of experimental group was carried out, and the correlation between the weight loss of the tooth tip and the hardness of the material was significant (P < 0. 147 / 0. 05). There is a high positive trend between hardness and mass loss, that is, with the increase of hardness. The mass loss increased to a certain extent. The wear rate of dentin and glass ceramics on grinding was the closest to that of dentin control group. Conclusion different materials will cause different degrees of wear on enamel and dentin. The wear resistance of the material and the wear resistance of the glass ceramics were analyzed from the wear morphology, hardness and mass loss of the material. The wear resistance of the glass ceramics matched the properties of the enamel. The wear resistance of polymeric porcelain is matched with that of dentin. Therefore, glass ceramics should be used as the restorative material for the clinical application of natural dental enamel. For the maxillary natural dentin exposed, the prosthesis should choose polymeric porcelain as its restorative material.
【學(xué)位授予單位】：華北理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：R783.1

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