目的 比较慢性牙周炎患者和牙周健康者唾液中钙离子浓度的不同及其水平，以及牙周临床指标的关系。方法 60例受试者分别为牙周健康对照组30例，试验组30例。收集研究对象的唾液样本，应用离子选择性电离分析仪对唾液标本钙离子浓度进行分析。将试验组唾液钙离子水平与其牙周临床指标进行相关性分析。结果 试验组唾液钙离子浓度为(2.24±0.02) mmol/L，对照组唾液钙离子浓度为(2.01±0.08)mmol/L，试验组唾液钙离子浓度高于对照组，差异有统计学意义(P<0.01)。试验组唾液钙水平与牙周探诊深度、临床附着丧失、牙龈指数、出血指数和牙石指数呈正相关关系，与菌斑指数无相关性。结论 唾液钙离子浓度可以通过提高牙菌斑矿化浓度影响慢性牙周疾病的发生和发展。

Objective To compare the calcium ion concentration in saliva between chronic periodontitis patients and periodontally healthy controls.Methods This study contained 60 subjects in all: 30 periodontally health subjects as control group and 30 patients with chronic periodontitis. The periodontally clinical parameters and salivary samples were collected. Then the concentration of calcium ion in saliva from all samples was analyzed by using ion selective ionization analyzer.Results The calcium concentrations in saliva from the subjects with chronic periodontitis and periodontally healthy group respectively were (2.24±0.02) mmol/L and (2.01±0.08) mmol/L. There was significant difference between chronic periodontitis group and control group (P<0.001).Conclusions The occurrence and development of salivary calcium ion concentration can improve the effect of plaque mineralization concentration in the chronic periodontal disease and there might be higher calcium ion concentration in saliva with chronic periodontitis compared with the periodontally health subjects.