摘要
目的 研究不同类型脱敏剂对活髓牙牙本质小管封闭以及全瓷修复黏接效果的影响,为临床上活髓牙全瓷修复选用脱敏剂提供依据.方法 收集健康完好离体第三磨牙12颗,牙体预备后制备牙本质片,将牙冠分为两半,共分出牙体24块,随机分为4组,每组6块:对照组(仅清洁牙本质表面并吹干)、双氟-12组(涂布氟化物脱敏剂:双氟-12脱敏剂)、奥敏清组(涂布生物活性玻璃为主要成分的脱敏剂:奥敏清脱敏剂)、Gluma组(涂布HEMA-戊二醛类脱敏剂:Gluma脱敏剂).SEM电镜扫描不同实验组表面特征,计算牙本质小管封闭率.在各组实验件表面按规范程序黏接瓷块后,万能力学测试仪检测最大剪切力,分析实验结果.结果 电镜扫描结果显示,Gluma组界面光滑平整,沉积物少,视野内仅有少数牙本质小管口可见.奥敏清组的牙本质小管封闭率(33.6％)显著高于对照组(10.7％),显著小于Gluma组(82.1％)和双氟-12组(80.0％),差异有统计学意义(P＜0.05).与对照组比较,Gluma组显著增强了最大剪切力(P＜0.05),奥敏清组和双氟-12组最大剪切力显著下降(P＜0.05).结论 含有HEMA-戊二醛类脱敏剂是一种合适的全瓷冠修复活髓隐裂牙的脱敏剂,而氟化物和生物活性玻璃类脱敏剂均不建议用于全瓷冠修复活髓隐裂牙的脱敏.
Abstract
Objective To observe the influence of different types of desensitizers on the sealing of dentinal tubules in vital teeth and the bonding effect of all-ceramic crowns,and to provide a basis for selecting desensitizing agents for the restoration of vital teeth with all-ceramic crowns in clinical practice.Methods Intact extracted molars were collected,and dentin slices were prepared after tooth preparation.The slices were randomly divided into 4 groups:group A(control group,no treatment),group B(application of fluoride desensitizing agent(Biofluoride 12),group C(application of biologically active glass-based desensitizing agent(Actim-ins),and group D(application of HEMA-glutaraldehyde-based desensitizing agent(Gluma).Scanning electron microscope(SEM)was used to examine the surface morphology of the different groups and the sealing rate of dentinal tubules was calculated.After bond-ing the ceramic blocks to the surface of each experimental group ac-cording to a standardized protocol,a universal testing machine was used to measure the maximum shear force and analyze the experimen-tal results.Results Both Gluma and Biofluoride 12 effectively sealed the dentinal tubules.Actiminspartially sealed the dentinal tu-bules,but its sealing effect was inferior to that of Gluma and Biofluo-ride12.The Gluma group significantly enhanced the maximum shear force of resin adhesives,while both Actimins and Biofluoride 12 groups observed a decrease of maximum shear force.Conclusion HEMA-based glutaraldehyde desensitizing agent is an appropriate de-sensitizing agent for all-ceramic crown restoration of vital cracked teeth.Fluoride-based desensitizing agent and biologically active glass-based desensitizing agent are both unsuitable for all-ceramic crown restoration of vital cracked teeth.
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