Influence of high-power Nd-YAG laser irradiation on mandible.
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High-power Nd-YAG laser (Power density: 1910 W/cm<SUP>2</SUP>, Total energy: 1188 J) was irradiated to canine mandibles, and bone defects reaching to bone marrow were made. The author compared the difference of healing process and histological changes in time course between the no treatment group, the group with removed carbonized layer, and the control group in which defects were made by bone bur instead of laser irradiation. The comparative studies were performed by means of soft X-ray radiographic, histopathological method, microradiography and OTC labelling method. The results obtained were as follows.<BR>(1) The marginal region of Nd-YAG laser wound showed minor cracks where calcification progressed day by day and the change was clealy observed as a radiopaque image and fluorescent image. No remarkable change was observed even after 24 weeks. Also, necrosis of osteocyteand vacuolation were observed in a wider range, while similar findings were observed although narrow in width in the group with removed carbonized layer. However, the control would showed no such finding.<BR>(2) Defective group by bone bur showed the formation of new bone after 2 weeks and healing process of bone was nearly completed after 20 weeks. In the group with removed carbonized layer after Nd-YAG laser irradiation, new bone were formed in bone marrow after 4 weeks, and in marginal part after 8 weeks and defects were filled after 20 weeks. In non-treated group after Nd-YAG laser irradiation, new bone was formed in bone marrow after 4 weeks, in marginal region after 16 weeks. However, carbonized and degenerated necrosis layers remained even after 24 weeks and defective cavities still existed. Finally, the bottoms of the cavities were lined with new bone from the bone marrow. The change seemed to be a compensatory reaction against delayed closure at the punctured site in cortex.<BR>These results indicated that Nd-YAG laser irradiation gives disorder of osseous tissue in wide range and the healing process was delayed. However, removal of carbonized layer seemed to make it possible that laser irradiated wounds had almost the same healing process as bone bur wounds.
- 社団法人 日本口腔外科学会の論文
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