不同处理因素对复合树脂微渗漏影响的体外实验研究

发布时间：2018-03-06 04:33

  本文选题：复合树脂　切入点：聚合收缩　出处：《滨州医学院》2015年硕士论文　论文类型：学位论文

【摘要】：目的：复合树脂如今已广泛应用于牙体缺损的治疗当中,然而其光照固化后仍不可避免地产生一定程度的聚合收缩。而这种聚合收缩应力有可能会破坏树脂和牙的粘结界面,造成边缘微渗漏,引起继发龋、牙齿术后敏感等不良后果。因此减少树脂修复后微渗漏一直是口腔医生关注的焦点。本实验分别从复合树脂预处理时的温度、复合树脂充填形式、是否加入预聚合树脂核以及不同光固化模式四个方面,探讨不同处理方法对牙体缺损治疗后边缘微渗漏的影响,以期找到一种能有效减少树脂治疗后微渗漏的方法,为临床操作提供理论基础。方法：实验一：新鲜拔除36颗上下颌恒磨牙,牙合面备V类洞,随机分为3组。A组：常温下用Z350树脂充填窝洞；B组：将在Z350树脂预热到60。C后充填窝洞； C组：将Z350树脂预冷到4。C后充填窝洞。经过500次冷热水循环试验后用品红染色。将牙体纵切成厚度为0.9mm的薄片,使用体视显微镜观测染料渗透深度。实验二：新鲜拔除36颗上下颌恒磨牙,牙合面备V类洞,随机分为3组。A组：常温下用Z350树脂充填窝洞；B组：将在Z350树脂预热到60。C后充填；C组：使用Z350树脂制作嵌体后修复窝洞。经过500次冷热水循环试验后用品红染色。将牙体纵切成厚度为0.9mm的薄片,使用体视显微镜观测染料渗透深度。实验三：新鲜拔除48颗上下颌恒磨牙,牙合面备V类洞,随机分为4组。A组：常温下用Z350树脂充填窝洞；B组：常温下充填时在窝洞中植入预聚合的复合树脂核；C组：将在Z350树脂预热到60。C后充填；D组：将在Z350树脂预热到60C后充填,并将预聚合的复合树脂核置入其中。经过500次冷热水循环试验后用品红染色。将牙体纵切成厚度为0.9mm的薄片,使用体视显微镜观测染料渗透深度。实验四：新鲜拔除48颗恒磨牙,颊面备V类洞,随机分为4组。将3MZ350树脂预热后充填,即刻用不同光固化模式行光照固化：A组：低强度光照组(400 mw/cm2×40 s)；B组：高强度光照组(800 mw／cm2×20 s)；C组：弱光引导组(100mw/cm2×10 s+800 mw/cm2×15 s)；D组：间歇光照组(800 mw/cm2×40 s,2s开,2 s关)。将标本进行温度循环,然后经品红溶液染色,使用体视显微镜观察标本颊舌向切片充填体边缘染料渗漏程度。结果：1.使用不同温度的复合树脂修复窝洞后的微渗漏两两之间均有显著性差异(P≤0.05)。预热组微渗漏明显小于预冷组。2.预热树脂组和嵌体组之间微渗漏差别无显著性,均显著小于直接充填组(P≤0.05)3.预热组和预热+树脂核组的微渗漏明显小于常温组和常温+树脂核组,差异具有显著性(P≤0.05)。预热组和预热+树脂核组之间差异没有显著性(P0.05)。常温组和常温+树脂核组之间差异没有显著性(P0.05)。4.高强度光组的微渗漏小于其他三组,差异具有显著性(P≤0.05),其他三组之间的差异没有显著性。结论：1.温度对复合树脂修复后的微渗漏有一定程度的影响,将复合树脂预热至60C时充填可减小充填后的微渗漏。将复合树脂预冷至4。C时会增加复合树脂的充填后的微渗漏。2.使用预热树脂充填和嵌体修复均可减小V类洞龈壁边缘微渗漏3.在常温或预热时加入复合树脂核对修复后的微渗漏没有明显影响。4.复合树脂预热后,使用低强度光,间歇光照和弱光引导均会降低修复后的边缘封闭性。
[Abstract]:Objective: to treat the composite resin now has been widely used in dental defects, but the light cured still inevitably have a certain degree of polymerization shrinkage. The polymerization shrinkage stress in bonding interface may destroy the resin and teeth, causing microleakage, causing secondary caries, teeth postoperative sensitivity etc. adverse consequences. So to reduce the microleakage of resin is the focus of attention. The doctor has oral and the effects of the composite resin pretreatment temperature, composite resin filling form, whether or not to join the pre polymerization resin core and different light curing modes in four aspects, to investigate the effect of different treatment methods on the treatment of microleakage tooth defect later, in order to find a method can effectively reduce the microleakage of resin after treatment, providing a theoretical basis for the clinical operation. Methods: experiment one: freshly extracted 36 molars. Teeth Surface preparation of V cavity, were randomly divided into 3 groups:.A group under normal temperature with Z350 resin restorations; group B: Z350 to 60.C after preheating in resin restorations; group C: Z350 resin pre cooled to 4.C after restorations. After 500 times of cold and hot water circulation after the test with magenta staining. The tooth was slit into sheet thickness of 0.9mm, using a microscope dye penetration depth. Experiment two: freshly extracted 36 molars. The occlusal surface preparation of class V cavity, were randomly divided into 3 groups:.A group under normal temperature with Z350 resin restorations; group B: in Z350 resin preheating to 60.C after filling; group C: making use of Z350 resin inlay after repairing cavity. After 500 times of cold and hot water circulation test with fuchsin staining. The tooth slit into the thickness of 0.9mm sheet, using a microscope dye penetration depth. Experiment three: freshly extracted 48 molars, occlusal surface preparation V绫绘礊,闅忔満鍒嗕负4缁，

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