ラバーダム装着から除去後に至るまでのＮｄ：ＹＡＧレーザーによる疼痛緩和効果に関する経時的変化

Abstract

The purpose of this study was to compare the pain-relieving effects of pulsed Nd:YAG laser irradiation with topical anesthetic application during placement of a rubber dam clamp.Twenty-two students, aged 22 to 31 years (mean 24.05), who had not experienced either endodontic or cervical restorative treatment of first permanent molars, participated in this study. In this study, the same tooth for the same patient was tested three times every week. The following were the conditions of each site: 1) control site: no pretreatment before placement of the rubber dam clamp, 2) topical anesthetic site: application of topical anesthetic 60 seconds before placement of the rubber dam clamp and wash-out by three-way syringe water, 3) Nd:YAG laser irradiation site: Nd:YAG laser irradiation before placement of the rubber dam clamp. The irradiation conditions were 120 mJ, 1.2 W, 10 pps, and irradiation time was 30 sec twice. The efficacy of pain-relief was assessed by visual analogue scale (VAS) at the start, before placement of the rubber dam clamp, after placement of the rubber dam clamp, and until 20 minutes at 2-minute intervals. The clamp was removed 14 minutes after the start. Pain-relieving effects were also examined by questionnaire.The VAS levels of both placement and removal of the rubber dam clamp were high for all sites. On placement of the rubber dam clamp, the VAS level with Nd:YAG laser irradiation was statistically significantly lower than with no preparation (P<0.05: Wilcoxon signed-ranks test). During placement of the rubber dam clamp, the VAS level with Nd:YAG laser irradiation and topical anesthetic application were statistically significantly lower than with no preparation (P<0.05: Wilcoxon signed-ranks test).