搜索结果: 1-14 共查到“口腔医学 pH”相关记录14条 . 查询时间(0.119 秒)
探讨咀嚼麦芽糖醇口香糖对唾液流率与pH值的影响。方法 选10例志愿者,分别检测咀嚼麦芽糖醇口香糖或木糖醇口香糖前后不同时间段唾液的流率和pH值。应用SPSS 12.0软件分析。结果 咀嚼2种口香糖10 min内,唾液流率显著增加,在2 ~ 4 min时达到峰值,实验组和对照组分别为(4.24 ± 0.30) mg/min和(4.53 ± 0.19) mg/min。唾液pH值在2 ~ 4 min时上...
楔状缺损与唾液和pH 值的关系
楔状缺损 唾液 pH 值
2014/3/11
楔状缺损是一种常见的非龋性牙体缺损性疾病，是牙体硬组织的慢性损伤，好发于中老年人，其病因复杂。近年来，随着研究方向的进一步拓展，唾液和pH 值在楔状缺损形成中的作用逐步显现，本文就唾液和pH 值对楔状缺损的影响进行回顾和总结。
Electrochemical behavior and pH stability of artificial salivas for corrosion tests
Saliva artificial Hydrogen-ion concentration Corrosion Sodium fluoride
2009/10/19
It is assumed that the compositions of artificial salivas are similar to that of human saliva. However, the use of solutions with different compositions in in vitro corrosion studies can lead dissimil...
In Vitro pH Analysis of Active and Arrested Dentinal Caries in Extracted Human Teeth Using a Micro pH Sensor
pH Active caries Arrested caries
2009/9/14
The aim of this study was to evaluate the pH at the surface of active or arrested carious dentin using a micro pH sensor, and to compare the relationship between different pH measurement techniques. T...
A Newly Designed Automatic pH-cycling System to Simulate Daily pH Fluctuations
Automatic pH-cycle Demineralization and remineralization Time-lapse analysis
2009/9/14
The aim of this study was to develop and evaluate an automatic pH-cycling system, which was intended for performing time-lapse analyses of dental caries. Two single-section specimens prepared from eac...
Evaluation of the Solubility of Dental Cements in Artificial Saliva of Different pH Values
Solubility Permanent cements Temporary cements
2009/9/14
The aim of this study was to determine the solubility of dental cements in artificial saliva of different pH values. A total of 180 specimens—20 specimens (20 mm diameter×1.5 mm thickness) for each de...
Effect of pH and Addition of Salt on the Adsorption Behavior of Lysozyme on Gold, Silica, and Titania Surfaces Observed by Quartz Crystal Microbalance with Dissipation Monitoring
Lysozyme Adsorption QCM-D
2009/9/11
The adsorption behaviors of lysozyme on dentally related Au, SiO2, and TiO2 surfaces were investigated by a quartz crystal microbalance with dissipation monitoring (QCM-D) method. Frequency shifts ind...
目的在模拟口腔环境下，研究牙科用铬合金（钴铬合金和镍铬合金）在pH值为7和5的人工唾液中的电化学腐蚀行为。方法用动电位极化曲线法，测定铬合金在pH值为7和5的人工唾液中自腐蚀电位、自腐蚀电流密度，与含钛元素镍铬合金进行比较分析；并用电化学阻抗谱研究铬合金的腐蚀机制和耐腐蚀性能。结果钴铬合金的自腐蚀电流密度低于含钛元素镍铬合金和镍铬合金，阻抗值高于含钛元素镍铬合金和合金；而镍铬合金自腐蚀电流密度高于...
变异链球菌gtfs在不同pH条件下表达的差异性
变异链球菌 葡萄糖基转移酶 实时定量逆转录聚合酶链反应
2010/9/14
目的检测具有不同产胞外多糖（EPS）能力的变异链球菌菌株在不同pH条件下产EPS的能力及其与gtfA、gtfB、gtfC、gtfD表达变化的关系。方法选取变异链球菌（血清型c）临床分离株502（高产糖株）和参考株UA159（低产糖株），以实时定量逆转录聚合酶链反应（real-time RT-PCR）方法检测在不同pH条件下与变异链球菌产糖能力密切相关的毒力因子gtfA、gtfB、gtfC、gtfD...
Evaluation of the Dental Plaque pH Recovery Effect of a Xylitol Lozenge on Patients with Fixed Orthodontic Appliances
Dental plaque pH Xylitol lozenge Fixed orthodontic therapy Dental caries risk
2008/12/11
The purpose of this study was to evaluate the influence of a xylitol lozenge on the dental plaque pH profile of fixed orthodontic patients. Twelve volunteers participated in this study. Before the...
不同饮料对不同龋敏感儿童牙菌斑pH值的影响
牙菌斑 饮料 pH值测定 龋病
2010/9/8
目的比较不同种类的饮料对龋敏感儿童及无龋儿童牙菌斑pH值的影响。方法采用微型蜂式pH指示电极原位测试儿童牙菌斑pH值。选择四川省成都市幼儿园3～5岁无龋儿童10名和龋敏感儿童10名作为研究对象，观察其饮用可口可乐、统一鲜橙多及乐百氏AD钙奶饮料后牙菌斑pH值的动态变化。结果无龋和龋敏感组儿童牙菌斑的静止pH值有统计学差异（ P<0.05）。饮用饮料后，各组牙菌斑pH值均下降，约5～10 min后达...
pH值对磁性固位体耐蚀性能的影响
磁性固位体 耐蚀性能 人工唾液
2010/9/14
目的 研究人工唾液的酸碱度在偏酸性的条件下,3 种磁性固位体外包裹容器的耐腐蚀能力的改变。方法 将3 种磁性固位体浸泡于人工唾液中,介质pH值分为516 和710 两组,实验温度3615 ℃,时间6 个月。采用恒电位法测定极化曲线实验、浸泡实验及扫描电镜方法,分析材料的耐腐蚀能力。结果 pH 值下降,磁性固位体外包裹容器———不锈钢中铁离子的溶出量提高近10 倍。表明在偏酸性的环境中,3 种材料的...
释放介质pH值对口腔粘膜生物粘附药膜体外释药的影响
口腔粘膜病 药膜 体外释放 药物动力学
2010/8/23
药物治疗是控制口腔粘膜病的主要手段。漱口水、软膏、凝胶等制剂是局部治疗口腔粘膜病的常见剂型。这些制剂在治疗开始时就释放药物,然后浓度迅速下降至治疗水平以下,不能长时间保持局部有效治疗浓度。本研究旨在了解和评价不同基质材料和介质pH 值对药物体外释放百分率和药物动力学的影响,以便合理预测药物的体内释放,为进一步研究开发生物粘附药膜提供实验依据。