Verdonschot E H, Rondel P, Huysmans M C
Trikon: Institute for Dental Clinical Research, Department of Cardiology and Endodontology, University of Nijmegen, The Netherlands.
Caries Res. 1995;29(2):100-6. doi: 10.1159/000262049.
The use of sealants and sealant restorations has increased considerably over the past 10 years, and with it increased the problem of detecting secondary caries and marginal (micro)leakage. It was the purpose of this study to investigate the validity of electrical conductance measurements (ECMs) in diagnosing marginal leakage into dentine of sealants and sealant restorations. Ninety extracted premolar teeth were divided into three groups. Initial ECMs, denoted 'baseline ECMs', were conducted in all three groups by placing the probe tip of an Electronic Caries Monitor in the occlusal fissure which was filled with a dentifrice. The ECMs were divided by the area, yielding ECM/mm2 values. In group A 30 teeth were treated to receive 'nonleaking sealants'. In the 30 teeth of group B a narrow groove was cut at the occlusal surface reaching the dentine and restored by the application of a sealant without etching of the adjacent enamel to create a high probability of marginal leakage. The samples in group C received the same treatment as those in group B, but in this group the enamel was etched to reduce the probability of marginal leakage. The ECMs subsequently conducted were denoted 'sealed/restored ECMs'. Teeth in groups B and C were thermocycled 700 times (4-67 degrees C) to provoke leakage, after which ECMs were conducted (denoted 'ECMs after thermocycling'). The teeth were immersed in fuchsin for 24 h and cut along the fissure system to validate marginal leakage. The electrical conductance decreased significantly from baseline to the sealed/restored stage in all groups (p < 0.05).(ABSTRACT TRUNCATED AT 250 WORDS)
在过去10年中，窝沟封闭剂及封闭修复体的使用显著增加，随之而来的是继发龋和边缘（微）渗漏检测问题的增多。本研究旨在探讨电导率测量（ECM）在诊断窝沟封闭剂及封闭修复体边缘渗漏至牙本质情况时的有效性。90颗拔除的前磨牙被分为三组。在所有三组中，通过将电子龋监测仪的探头尖端置于充满洁齿剂的咬合沟中来进行初始ECM，即“基线ECM”。将ECM值除以面积，得出ECM/mm²值。A组30颗牙齿接受“无渗漏封闭剂”处理。B组的30颗牙齿在咬合面切割出一条窄沟直至牙本质，然后在不蚀刻相邻釉质的情况下应用封闭剂进行修复，以产生较高的边缘渗漏可能性。C组样本接受与B组相同的处理，但该组对釉质进行蚀刻以降低边缘渗漏的可能性。随后进行的ECM被称为“封闭/修复后ECM”。B组和C组的牙齿进行700次热循环（4 - 67摄氏度）以引发渗漏，之后进行ECM（称为“热循环后ECM”）。将牙齿浸入品红中24小时，然后沿裂隙系统切开以验证边缘渗漏情况。所有组从基线到封闭/修复阶段电导率均显著降低（p < 0.05）。（摘要截断于250字）
