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The purpose of this study was to evaluate the pain relief effects of pulsed Nd: YAG laser irradiation with and without Chinese ink. Twenty mandibular canines and the mucogingival areas were examined in this study (10 males, 10 females; aged 25 to 30 years; the mean age, 26.5 years). The right areas were irradiation sites (with and without Chinese ink), and the left areas were control sites without irradiation. The conditions for irradiation were laser energy 1.5w, pulses per second 15pps, and irradiation time 60sec. And the laser was irradiated on mucogingival surfaces stained with and without Chinese ink. Also, pain relief effects were evaluated as to pulp thermal sensitivity and surface anesthetic effect. (1) Evaluation of pulp thermal sensitivity: The buccal surfaces of canines were heated to 65°C with the tip of a heat probe, and each subject reported an immediate response to pulp thermal sensitivity. And, the degree of pulp thermal sensitivity was measured by a pain thermometer on irradiation sites and control sites. (2) Evaluation of surface anesthetic effect: The mucobuccal folds were penetrated with a 30G cartridge needle, and each subject reportedan immediate response to needle penetration on the irradiation site and the control site. The pain was classified into the following three grades: grade 1, no pain; grade 2, slight pain; grade 3, pain. For these results of pain relief effects on pulp thermal sensitivity and surface anesthetic effects, there was a statistically significant difference in the pain relief effects between the irradiation site and the control site (P<0.05: Wilcoxon signed-ranks test). In the irradiation site, the pain relief effect of Nd: YAG laser irradiation with Chinese ink was significantly more effective than that without Chinese ink (P<0.001: Wilcoxon signed-ranks test). This study suggested that Nd: YAG laser irradiation with Chinese ink may be useful for pain relief.
- 日本レーザー歯学会の論文