Bashir E, Gustavsson A, Lagerlöf F
Department of Cariology, School of Dentistry, Karolinska Institutet, Huddinge, Sweden.
Caries Res. 1995;29(6):467-9. doi: 10.1159/000262116.
Erosion of the buccal incisor enamel, most frequent in the upper jaw, has been associated with excessive oral exposure to citric acid-containing foodstuffs. The aim of the study was to determine the retention of citric acid at different sites in the mouth after a standardized exposure. Thirty-four normal subjects rinsed with 95.2 mmol/l (2%) citric acid, pH 2.1, for 5 s. At 1 min 55 s after the rinse a preweighed cotton pellet was used to collect saliva samples from upper labial incisor surfaces (UB), lower labial incisor surfaces (LB) and sublingually (SL). The citric acid concentration was determined enzymatically. The concentrations were (mean +/- SD): 32.12 +/- 19.50, 11.90 +/- 8.60 and 1.52 +/- 1.90 mmol/l in the saliva collected from the UB, LB and SL sites, respectively. Analysis of variance revealed that the citric acid concentration in the upper incisor site differed significantly from that of the lower incisor site (p < 0.001) and the sublingual site (p < 0.001), and that the lower incisor site differed significantly from the sublingual site (p < 0.001). The individuals differed significantly with respect to citric acid retention (p < 0.05). A significant correlation was found between UB and LB sites (r = 0.61, p < 0.05).
颊侧切牙牙釉质侵蚀在上颌最为常见，这与口腔过度接触含柠檬酸的食物有关。本研究的目的是确定标准化暴露后柠檬酸在口腔不同部位的留存情况。34名正常受试者用95.2 mmol/l（2%）的柠檬酸（pH 2.1）冲洗5秒。冲洗后1分55秒，用预先称重的棉球从上门唇切牙表面（UB）、下门唇切牙表面（LB）和舌下（SL）采集唾液样本。采用酶法测定柠檬酸浓度。各部位浓度分别为（均值±标准差）：从UB部位采集的唾液中为32.12±19.50 mmol/l，LB部位为11.90±8.60 mmol/l，SL部位为1.52±1.90 mmol/l。方差分析显示，上门牙部位的柠檬酸浓度与下门牙部位（p < 0.001）和舌下部位（p < 0.001）有显著差异，下门牙部位与舌下部位也有显著差异（p < 0.001）。个体在柠檬酸留存方面存在显著差异（p < 0.05）。UB部位和LB部位之间存在显著相关性（r = ０.61，p < 0.05）。
