Zero D T, Rahbek I, Fu J, Proskin H M, Featherstone J D
Eastman Dental Center, Rochester, N.Y.
Caries Res. 1990;24(3):181-8. doi: 10.1159/000261263.
The relationship among the iodide permeability (Ip) test, the surface microhardness (SMH) test, and enamel demineralization chemically analyzed as mineral loss was investigated using bovine enamel blocks. Demineralization periods of 0 (control) and 5, 15, 30, and 45 min using 0.05 mol/l lactate (pH 4.75) were chosen to approximate the acid challenge occurring during the intraoral enamel demineralization test. Mineral loss (Ca and PO4) was found to be directly proportional to dissolution time (r = 0.95). Changes (delta) in Ip and SMH each increased linearly over time (r = 0.58 and 0.64, respectively) and were similarly related to mineral loss (r = 0.60 and 0.65, respectively). The correlation between delta Ip and delta SMH was 0.55. When longer demineralization periods (60, 120, and 240 min) were included, the correlation between delta Ip and delta SMH was 0.68. We conclude that both the Ip test and the SMH test can be used as measures of the early stages of enamel dissolution.
使用牛牙釉质块研究了碘离子渗透性（Ip）测试、表面显微硬度（SMH）测试与作为矿物质损失进行化学分析的牙釉质脱矿之间的关系。选择使用0.05 mol/l乳酸（pH 4.75）进行脱矿0（对照）、5、15、30和45分钟的时间段，以模拟口腔内牙釉质脱矿测试期间发生的酸侵蚀。发现矿物质损失（钙和磷酸盐）与溶解时间成正比（r = 0.95）。Ip和SMH的变化（δ）均随时间呈线性增加（分别为r = 0.58和0.64），并且与矿物质损失也有相似的关系（分别为r = 0.60和0.65）。δIp与δSMH之间的相关性为0.55。当纳入更长的脱矿时间段（60、120和240分钟）时，δIp与δSMH之间的相关性为0.68。我们得出结论，Ip测试和SMH测试均可作为牙釉质溶解早期阶段的测量方法。
