Nd:YVO_4激光照射辅助两种漂白剂牙齿漂白的实验研究

Experimental Study on Nd:YVO_4 Laser Irradiation Used in Tooth Bleaching

目的研究Nd:YVO_4激光照射对牙齿漂白效果的影响,为临床应用提供实验依据。方法以人离体牙为研究对象,建立体外漂白实验模型,采用Beyond及Ultradent Boost过氧化氢成分漂白剂,选择波长为532nm的Nd:YVO_4激光,功率800mW作用于釉质表面,检测牙髓腔内温度变化,通过分光光度比色仪分别于漂白前、漂白后即刻、漂白后4、7和30d,分析牙齿颜色变化值(ΔE)。结果 Boost激光照射组髓腔温度变化量最高。各组均获得了明显的颜色变化。在各时间点,Beyond激光照射组ΔE高于无激光照射组(P>0.05)。Boost激光照射组ΔE在各时间点均显著高于Beyond激光照射组(P<0.05)。结论使用Boost高效牙齿漂白剂,532nm全固态单频Nd:YVO_4激光器,功率为800mW,照射时间20s,总漂白时间5min,可以获得较好的漂白效果。

Objective To study the effect of Nd ： YVO4 laser on tooth bleaching and provide experimental data for clinical application. Methods In vitro human teeth bleaching models were constructed. A 532 nm Nd ： YVO4 laser having an output of 800 mW was used to activate Beyond （35 % hydrogen peroxide） and Uhradent Boost （38% hydrogen peroxide） bleaching gel. The change of pulp tempera- ture was measured within 60 s. The teeth color was evaluated witha spectrophotometer before the bleaching, immediately after the bleaching, and 4, 7 and 30 days after the bleachingrespectively.Results The temperature increased most in the Boost plus irradiation group. Shade changes were observed in all thegroups. At each time point, the Beyond plus irradiation group showed a higher AE than the sole Beyond group （ P 〉 0. 05 ）. The Boost plus irradiation grouphada higher ΔE than the Beyond plus irradiation group.Conclusions The irradiation of a 800 mW 532 nm Nd ： YVO4 laser for 20 s will raise the bleaching efficiency of Boost gel.