Er:YAG激光与高速手机处理乳牙牙本质表面对树脂剪切强度影响的对比研究

发布时间：2019-01-30 08:19

【摘要】：目的：对比研究Er:YAG激光和高速手机处理乳牙牙本质后对复合树脂剪切强度的影响。方法：收集符合标准的下颌乳前牙共124颗，分别包埋在大小为3cm×5cm的超硬石膏中。并随机分为A、B、C、D4个组，每组31颗牙齿。A组和B组用Er:YAG激光（功率2W）暴露乳牙唇面牙本质，C组和D组用高速手机暴露乳牙唇面牙本质，每组随机抽取1个样本进行扫描电镜取像并观察比较。A组和C组样本进行酸蚀处理后，其余120个样本树脂充填后进行剪切强度测试并统计分析。结果：扫描电镜观察发现Er:YAG激光处理的乳牙牙本质表面不平，呈鱼鳞状、波浪状的粗糙外观，表面清洁无玷污层，牙本质小管口清晰可见，管周牙本质较管间牙本质突出于表面，大量开放的牙本质小管口呈“袖口”样外观；高速手机处理的牙体表面留下横纹，切面较平，表面覆盖一层致密的玷污层，，并伴有明显的龟裂，牙本质结构不清晰，牙本质断面上偶见牙本质小管开放。剪切强度经统计分析得出A组的剪切强度为（11.45±3.79）Mpa，B组为（9.78±3.35）Mpa，A组与B组比较无统计学差异（P0.05），尚不能认为A组与B组的剪切强度有不同；C组为（8.97±4.03）Mpa，D组（5.90±3.29）Mpa，C组与D组比较有统计学差异（P0.05），可以认为C组与D组的剪切强度不同；A组与C组比较有统计学差异（P0.05），可以认为A组与C组的剪切强度不同；B组与D组比较有统计学差异（P0.05），可以认为B组与D组的剪切强度不同。结论：乳牙牙本质表面使用功率为2W的Er:YAG激光处理后，是否联合酸蚀处理均可提高其与复合树脂间的剪切强度；高速手机联合酸蚀处理乳牙牙本质可提高复合树脂剪切强度。
[Abstract]:Objective: to compare the effect of Er:YAG laser and high speed mobile phone on shear strength of deciduous dentin. Methods: a total of 124 mandibular premolars were collected and embedded in superanhydrite of the size of 3cm 脳 5cm. Each group was randomly divided into 4 groups: group A and group B exposed dentin to labial surface of deciduous teeth with Er:YAG laser (power 2W), group C and group D exposed dentin of labial surface of deciduous teeth with high-speed mobile phone. Group A and group C were treated by acid etching, and the other 120 samples were filled with resin for shear strength test and statistical analysis. Results: the primary dentin treated by Er:YAG laser was found to have rough surface, fish scale, wavy appearance, clean and untarnished surface, and the orifice of dentine tubules was clearly visible. The peritube dentin was more prominent than the intertube dentin on the surface, and a large number of open dentine tubules presented a "cuff" appearance. The surface of the tooth treated by high-speed mobile phone was flat, with a dense smear layer, with obvious cracks, unclear dentin structure, and occasionally open dentin tubules on the dentin section. The shear strength of group A was (11.45 卤3.79) Mpa,B and that of group B was (9.78 卤3.35) Mpa,A (P0.05). The shear strength of group A is not different from that of group B; Group C (8.97 卤4.03) Mpa,D group (5.90 卤3.29) Mpa,C was significantly different from group D (P0.05), the shear strength of group C and D was different. Group A and group C have statistical difference (P0.05), it can be considered that the shear strength of group A and group C is different; group B and group D have statistical difference (P0.05), we can think that the shear strength of group B and group D is different. Conclusion: the shear strength between deciduous dentin and composite resin can be improved by using 2W Er:YAG laser treatment or not. High-speed mobile phone combined with acid etching treatment of deciduous dentin can improve the shear strength of composite resin.
【学位授予单位】：新疆医科大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：R788.1

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