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We have already reported that dental pulp can be securely protected against Er: YAG laser irradiation during caries removal, because the related heat can be controlled by simultaneous cooling with a water spray. However, this water spray may reduce the cutting efficiency, if used excessively. The present study was carried out to determine the optimal amount of water spray during dentin cutting with Er: YAG laser irradiation. Temperature was measured under six different conditions, prepared by changing the amount of water spray (0, 1, 2, 4, 6 and 8ml/min) during Er: YAG laser irradiation, and the cut surface was observed by stereoscopic microscopy for morphological evaluation. The results were are as follows:<BR>1. Temperature elevation by laser irradiation could be prevented with a small amount of water spray.<BR>2. Thermal damage was observed on the irradiated surface under stereoscopic microscopy when the irradiation had been made without water spray, or with water spray at 1ml/min.<BR>3. The depth of cavity was largest in the non-water spray group, and the cavity area tended to become shallower as the amount of water spray was increased.<BR>4. Cutting decreased in efficiency if performed with watar spray at 6 and 8ml/min, as compared with cut volumes obtained with water spray at 1-4 ml/min.<BR>From these results, it is inferred that 2 to 4ml/min is an optimal amount of water spray during dentin cutting with Er: YAG laser irradiation.
- 日本レーザー歯学会の論文