Radvar M, Creanor S L, Gilmour W H, Payne A P, McGadey J, Foye R H, Whitters C J, Kinane D F
Department of Adult Dental Care, Glasgow Dental Hospital & School, Scotland, UK.
J Clin Periodontol. 1995 Jan;22(1):71-7. doi: 10.1111/j.1600-051x.1995.tb01773.x.
The aim of this study was to evaluate the effects of Nd:YAG laser treatment on subgingival calculus, cementum and dentine, in vitro at different power settings and durations. The study included 2 experiments. In the 1st experiment, 32 extracted teeth with calculus were divided into 8 laser treatment groups. Each tooth was treated on 2, 3 or 4 sites. In the 2nd experiment, 3 extracted cementum covered teeth and 3 extracted root planed teeth with exposed dentine were selected. 1 surface of each tooth was subjected to 8 different laser treatments. In both experiments, all specimens were assessed using scanning electron microscopy. Micrographs were taken from each treated site at x 100 and x 750 magnifications. An arbitrary scale (from 0 to 3) was used to score the degree of damage caused by the laser. Generally, the laser caused greater damage on calculus than either cementum or dentine. Linear regression analysis showed that higher total energy input caused a greater mean damage score on calculus (R2 = 66%, p < 0.001). 3-way analysis of variance showed that for calculus, the power setting, number of pulses per second and the duration of exposure contributed independently to the mean damage score in an additive way. Cementum specimens were not affected by treatment 1 (50 mJ, 10 pps, 1 s), treatment 2 (50 mJ, 10 pps, 5 s), and treatment 5 (50 mJ, 20 pps, 1 s). Dentine specimens were not affected by treatment 1 (50 mJ, 10 pps, 1 s).(ABSTRACT TRUNCATED AT 250 WORDS)
本研究的目的是在体外评估不同功率设置和持续时间下，钕钇铝石榴石（Nd:YAG）激光治疗对龈下牙结石、牙骨质和牙本质的影响。该研究包括2个实验。在第一个实验中，32颗有牙结石的拔除牙齿被分为8个激光治疗组。每颗牙齿在2、3或4个部位接受治疗。在第二个实验中，选取了3颗有牙骨质覆盖的拔除牙齿和3颗牙本质暴露的根面平整后的拔除牙齿。每颗牙齿的1个表面接受8种不同的激光治疗。在两个实验中，所有标本均使用扫描电子显微镜进行评估。在100倍和750倍放大倍数下从每个治疗部位拍摄显微照片。使用任意尺度（从0到3）对激光造成的损伤程度进行评分。一般来说，激光对牙结石造成的损伤比对牙骨质或牙本质造成的损伤更大。线性回归分析表明，更高的总能量输入会使牙结石的平均损伤评分更高（R2 = 66%，p < 0.001）。三因素方差分析表明，对于牙结石，功率设置、每秒脉冲数和暴露持续时间以累加方式独立地对平均损伤评分产生影响。牙骨质标本不受治疗1（50 mJ，10 pps，1 s）、治疗2（50 mJ，10 pps，5 s）和治疗5（50 mJ，20 pps，1 s）的影响。牙本质标本不受治疗1（50 mJ，10 pps，1 s）的影响。（摘要截断于250字）
