Leonard R H, Austin S M, Haywood V B, Bentley C D
Department of Dental Ecology, University of North Carolina, School of Dentistry, Chapel Hill 27599-7450, USA.
Quintessence Int. 1994 Dec;25(12):819-23.
The purpose of this study was to evaluate in vivo changes in the pH of plaque and of a 10% carbamide peroxide solution occurring within the bleaching guard during a 2-hour nightguard vital bleaching procedure. Baseline pH values for plaque and the carbamide peroxide solution were established. A small hole was placed in the anterior interproximal region of the guard to allow placement of the pH electrode. The pH of the carbamide peroxide solution was measured at 5-minute intervals. After 2 hours, the guard was removed and pH of the plaque was remeasured. The procedure was repeated three times on each of four subjects. The mean baseline pH reading for plaque was 6.31 and mean final pH reading was 6.86. The difference was statistically significant. At initial placement of the carbamide peroxide-filled guard, the mean intraguard pH was 4.50 (range of 2.80 to 7.80). The mean peak intraguard pH of 8.06 (range of 7.30 to 8.43), which was significantly different from baseline, was obtained within 31 minutes. The pH of plaque, saliva, and a 10% carbamide peroxide bleaching solution within the guard increased significantly during bleaching and remained significantly elevated for the duration of the study (2 hours).
本研究的目的是评估在夜间护齿器活髓漂白过程的2小时内，护齿器内菌斑和10%过氧化脲溶液的pH值在体内的变化。确定了菌斑和过氧化脲溶液的基线pH值。在护齿器的前牙邻间隙区域开一个小孔，以便放置pH电极。每隔5分钟测量一次过氧化脲溶液的pH值。2小时后，取下护齿器，重新测量菌斑的pH值。该程序在四名受试者中的每一位身上重复进行三次。菌斑的平均基线pH读数为6.31，平均最终pH读数为6.86。差异具有统计学意义。在最初放置充满过氧化脲的护齿器时，护齿器内的平均pH值为4.50（范围为2.80至7.80）。在31分钟内获得了平均峰值护齿器内pH值8.06（范围为7.30至8.43），与基线有显著差异。在漂白过程中，护齿器内菌斑、唾液和10%过氧化脲漂白溶液的pH值显著升高，并在研究期间（2小时）一直保持显著升高。
