不同修复材料对牙釉质及牙本质磨损性能的研究

发布时间：2018-01-26 14:33

本文关键词： 口腔修复材料摩擦磨损实验耐磨损性能釉质牙本质　出处：《华北理工大学》2016年硕士论文　论文类型：学位论文

【摘要】：目的选用四种口腔常用修复材料,在体外与天然牙釉质及牙本质进行摩擦磨损实验,研究口腔修复材料与天然牙釉质、牙本质之间磨损性能的匹配情况,为临床选择修复体提供适当参考和实验依据。方法以未磨耗的天然牙釉质、牙本质牙尖为研究对象,以高度抛光的聚合瓷、玻璃陶瓷、氧化锆、纯钛为摩擦副。釉质组分为对照组、实验组,对照组为釉质牙尖与釉质对磨,实验组为牙尖分别与四种材料对磨;牙本质分组同釉质组。利用微摩擦磨损实验机,垂直向载荷15N,摩擦运动方式为往复运动,循环次数6000次,位移1mm,频率2HZ,使釉质、牙本质分别与聚合瓷、玻璃陶瓷、氧化锆、纯钛对磨,经处理得出摩擦系数等参数的变化曲线。采用扫描电镜观察牙尖及材料磨损前后的表面形貌,粗糙度仪测牙釉质、牙本质及材料的粗糙度,HVS-50Z型自动转塔数显维氏硬度仪测釉质、牙本质及材料的表面硬度,电子天平测釉质、牙本质牙尖摩擦实验后的质量损失量。结果1摩擦实验后,电镜下釉质牙尖表面显微形貌皆有划痕及脱落颗粒出现,其中釉质对照组、玻璃陶瓷组及纯钛组牙尖表面出现大量碎屑及疲劳裂纹,聚合瓷组牙尖表面较光滑,氧化锆组牙尖表面磨损严重,有犁沟存在。通过spss17.0对实验组及对照组实验后釉质牙尖的磨损量进行分析,实验组与对照组具有统计学差异(p=0.000,0.05),即四种材料及对照组对釉质牙尖造成的磨损量不完全相同。对实验组各组牙尖质量损失量与材料硬度之间进行关联性分析(r=0.979,0.8,P=0.004,0.05),相关性显著,可以看出硬度和质量损失量间具有高度正相关性,即随着硬度的增加,质量损失量也增加。其中釉质与玻璃陶瓷对磨后的磨损量与釉质对照组最接近。2摩擦实验后,电镜下牙本质牙尖表面显微形貌皆有划痕及脱落颗粒出现,其中牙本质对照组、聚合瓷组牙尖表面可见变形的牙本质小管形态,玻璃陶瓷组、纯钛组、氧化锆组牙尖表面磨损严重,牙本质小管不可见,磨损区有大量碎屑及犁沟存在。通过spss17.0对实验组及对照组实验后牙本质牙尖的磨损量进行分析,实验组与对照组具有统计学差异(p=0.000,0.05),即四种材料及对照组对牙本质牙尖造成的磨损量不完全相同;对实验组各组牙尖质量损失量与材料硬度之间进行关联性分析(r=0.846,0.8,P=0.147,0.05),相关性显著,硬度和质量损失间有高度正向趋势,即随着硬度的增加,质量损失量有一定程度增加。其中牙本质与玻璃陶瓷对磨后的磨损量与牙本质对照组最接近。结论不同材料均会对釉质、牙本质造成不同程度的磨耗,从磨损形貌、材料硬度及质量损失分析材料的耐磨性,玻璃陶瓷的耐磨性与釉质的性能相匹配,聚合瓷的耐磨性与牙本质的性能相匹配。因此临床对颌天然牙釉质存在的,修复体宜选用玻璃陶瓷作为其修复材料;对颌天然牙本质暴露的,修复体宜选用聚合瓷作为其修复材料。
[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.
【学位授予单位】：华北理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：R783.1

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