劲润牙本质保护膜对不同粘结剂与牙本质间剪切强度的影响

发布时间：2018-07-25 17:34

【摘要】：目的：随着科技发展,全瓷冠、瓷贴面等修复方式所带来的美学效果逐渐得到患者的普遍认可,要求美容修复的患者日渐增多,同时活髓牙不能做冠的旧思想逐渐被摒弃,导致活髓牙修复的病例越来越多,与此同时,越来越多的患者产生牙本质过敏,于是医师开始尝试对牙体预备后的牙本质进行脱敏,研制出不同种类、不同原理的脱敏剂,并在临床工作中取得了不错的治疗效果,以至于有些医生认为,活髓牙牙体预备后不进行脱敏是不道德的行为。 劲润牙本质保护膜是由日进齿科研发的一种新型脱敏剂,其优良的牙本质脱敏效果得到医师的广泛好评。学者已经证实涂布牙本质保护膜之后会在牙本质表面形成一厚约5μm的硬质涂层,表面光滑,质地坚硬。但这一涂层会阻碍粘结剂与牙本质间的相互作用,其对粘结剂粘结强度的影响鲜有报道。 本实验拟研究劲润牙本质保护膜对GIC、 ZPCC、 RMGIC、 RC4种粘结剂与牙本质间剪切强度的影响,为临床中使用牙本质保护膜并匹配相应的粘结剂提供依据。 方法：收集40颗因正畸而拔除的人前磨牙,无龋坏及裂纹,未行任何牙科治疗,保存于生理盐水中并定期更换,保存期介于1-2个月之间。将离体牙包埋于自凝树脂底座中,高速手机磨除颊舌侧牙釉质,形成两个相互平行的面,且面积大于4×4mm,随机分为GIC、 ZPCC、 RMGIC、 RC4个组,每组10个样本,每组随机选取5个以颊侧为实验组,其余5个以舌侧为实验组。实验组75%酒精棉球消毒吹干后涂布牙本质保护膜并光固化,对照组75%酒精棉球消毒吹干后不做特殊处理,分别将4×4×2mm硅橡胶圈贴附于牙本质表面,每一组按照厂家推荐的粉液比调拌粘结剂,充满硅橡胶圈,待粘结剂初步凝固后小心去除硅橡胶圈,形成4×4×2mm的粘结端。37℃水浴锅中静置24h后行剪切试验,记录剪切强度及断离类型。每组随机选取1个样本喷金后扫描电镜观察、拍照。利用SAS9.13软件进行统计学分析,X2检验检测断离类型,以P0.05记为有统计学意义。 结果：1.使用牙本质保护膜使GIC的粘结强度减少3.798MPa,使ZPCC的粘结强度减少8.389MPa,使RMGIC的粘结强度增强4。143MPa,使RC的粘结强度增强5.628MPa, P值均小于0.05,有统计学意义。 2.扫描电镜显示剪切实验后,所有实验组牙本质保护膜层完整,未见牙本质小管结构,对照组可见牙本质小管结构,被残余粘结剂封闭。 结论：1.劲润牙本质保护膜可以降低GIC、 ZPCC的剪切强度。 2.劲润牙本质保护膜可以增强RMGIC、 RC的剪切强度。 3.牙本质保护膜涂层不会因粘结剂的使用而破坏,其牙本质粘结性能稳定。
[Abstract]:Objective: with the development of science and technology, the aesthetic effect brought by all ceramic crowns and porcelain veneers was generally accepted by the patients, and the old idea that the living pulp teeth could not be used as crowns was gradually abandoned. More and more cases resulted in the restoration of living pulp teeth. At the same time, more and more patients developed dentin allergies. So doctors began to try to desensitize the dentin after dental preparation, and developed different kinds and different principles of desensitizers. Some doctors believe that it is immoral to desensitize a living pulp tooth after preparation. Jinrun dentin protective film is a new desensitizer developed by Japanese dentin department. Its excellent effect of dentin desensitization has been widely praised by doctors. It has been proved that a rigid coating of about 5 渭 m thick is formed on the dentin surface after the coating of dentin protective film, the surface is smooth and the texture is hard. However, this coating will hinder the interaction between binder and dentin, and its influence on bond strength of binder is rarely reported. The purpose of this study was to study the effect of dentine protective film on shear strength between GIC, ZPCC, RMGIC, RC4 binder and dentin, and to provide a basis for clinical use of dentin protective film and matching corresponding binder. Methods: 40 human premolars extracted by orthodontics were collected without caries and cracks. They were preserved in normal saline and changed regularly. The preservation period was between 1 and 2 months. The isolated teeth were embedded in the self-coagulating resin base. The enamel of the buccal and lingual side was ground by high speed mobile phone, and two parallel surfaces were formed, and the surface area was larger than 4 脳 4 mm. The tooth was randomly divided into GIC, ZPCC, RMGIC, RC4 group with 10 samples in each group. Each group randomly selected 5 buccal side as experimental group, the remaining 5 lingual side as experimental group. In the experimental group, 75% alcohol cotton balls were coated with dentin protective film and cured by light after disinfection and drying. In the control group, 75% alcohol cotton balls were disinfected and dried without special treatment, and 4 脳 4 脳 2mm silicone rubber rings were attached to the dentin surface, respectively. Each group was filled with silicone rubber rings according to the powder / liquid ratio recommended by the manufacturer. After the binder was initially solidified, the silicone rubber ring was carefully removed, and the adhesive end of 4 脳 4 脳 2mm was formed in a water bath pot at .37 鈩，

本文编号：2144541