Ogaard B, Ten Bosch J J
Department of Orthodontics, Faculty of Dentistry, University of Oslo, Norway.
Am J Orthod Dentofacial Orthop. 1994 Sep;106(3):238-42. doi: 10.1016/S0889-5406(94)70042-7.
This article describes a new nondestructive optical method for evaluation of lesion regression in vivo. White spot caries lesions were induced with orthodontic bands in two vital premolars of seven patients. The teeth were banded for 4 weeks with special orthodontic bands that allowed plaque accumulation on the buccal surface. The teeth were left in the dentition for 2 or 4 weeks after debanding. Regular oral hygiene with a nonfluoridated toothpaste was applied during the entire experimental period. The optical scattering coefficient of the banded area was measured before banding and in 1-week intervals thereafter. The scattering coefficient returned to the sound value in an exponential manner, the half-value-time for left teeth being 1.1 week, for right teeth 1.8 weeks, these values being significantly inequal (p = 0.035). At the start of the regression period, the scattering coefficient of left teeth lesions was 2.5 as high as of right teeth lesions, values being inequal with p = 0.09. It is concluded that regression of initial lesions in the presence of saliva is a relatively rapid process. The new optical method may be of clinical importance for quantitative evaluation of enamel lesion regression developed during fixed appliance therapy.
本文介绍了一种用于体内评估病变消退的新型无损光学方法。在7名患者的两颗活髓前磨牙上用正畸带诱导白斑龋损。用特殊的正畸带将牙齿绑扎4周，使颊面有菌斑堆积。拆除正畸带后，将牙齿留在牙列中2或4周。在整个实验期间，使用不含氟的牙膏进行常规口腔卫生护理。在绑扎前及之后每隔1周测量绑扎区域的光学散射系数。散射系数以指数方式恢复到正常水平，左侧牙齿的半衰期为1.1周，右侧牙齿为1.8周，这些值显著不等（p = 0.035）。在消退期开始时，左侧牙齿病变的散射系数是右侧牙齿病变的2.5倍，p值为0.09，二者不等。结论是在唾液存在的情况下，初始病变的消退是一个相对快速的过程。这种新的光学方法对于定量评估固定矫治器治疗期间牙釉质病变的消退可能具有临床重要性。
