快速扩弓前后龈沟液天冬氨酸转氨酶、碱性磷酸酶水平的变化

目的：研究快速扩弓前后龈沟液天冬氨酸转氨酶（AST）与碱性磷酸酶（ALP）水平的变化,以及其与快速扩弓牙周组织改建的关系.方法：选择38例快速扩弓的患者（10.5～12.8岁）,随机分为对照组（18例）和加力组（20例）.利用全自动化生化分析仪检测快速扩弓前,快速扩弓24h、7d,及保持7d、14d、28d的龈沟液AST、ALP水平的变化,结果以酶总量/牙表示.采用SAS（r）Proprietary Software Version 9.00对数据进行配对t和两样本t检验.结果：加力组AST水平在快速扩弓24h后开始升高（P＜0.05）,对照组在快速扩弓7d后开始升高（P＜0.01）,2组AST水平至保持28d时一直维持在较高水平（P＜0.01）;扩弓24h至保持28d,加力组与对照组AST水平存在显著差异（P＜0.05）.加力组和对照组ALP水平在快速扩弓7d后开始升高,至保持28d时一直维持在较高水平（P＜0.01）;从扩弓7d至保持28d,加力组与对照组ALP水平存在显著差异（P＜0.01）.结论：龈沟液AST、ALP水平可以在一定程度上反映快速扩弓后牙周组织的改建.

Changes of aspartate aminotransferase and alkaline phosphatase activities in gingival crevicular fluid during rapid palatal expansion

PURPOSE: This study was designed to examine the changes of aspartate aminotransferase (AST) and alkaline phosphatase (ALP) activities in gingival crevicular fluid (GCF) during rapid palatal expansion, and to explore the relationship between these changes and periodontal tissue remodeling. METHODS: Thirty-eight patients (aged 10.5 to 12.8years) who required opening of the palatal suture as the first stage of their orthodontic treatment were included and studied. The patients were divided into two groups: control group (18 cases) and experimental group (20 cases). GCF samples were collected at 6 observation periods with filter paper strips: before activation, 24 hours and 7 days after activation, 7 days, 14 days, and 28 days in retention. AST and ALP activities were determined by a full automatic biochemical analyzer, and the results were expressed as total AST and ALP activities. The data was analyzed with SAS (r) Proprietary Software Version 9.00 for paired t test and two-sample t test. RESULTS: AST activity was significantly elevated after 24-hour activation in the test group (P<0.05), but after 7-day activation in the control group (P<0.01). Both in the control and experimental group, AST activity remained high until 28-day in retention (P<0.01). AST activity in the test group was significantly greater compared to the control group from 24-hour activation to 28-day in retention (P<0.05). ALP activity increased significantly from 7-day activation to 28-day retention in the control and experimental group (P<0.01), and there was statistically significant difference between the control and the experimental group from 7-day to 28-day in retention (P<0.01). CONCLUSION: Our results suggest that AST and ALP levels in GCF may reflect the tissue remodeling which occurs in the periodontium during rapid palatal expansion to some degree.