Er : YAGレーザー照射後のラット象牙質・歯髄の電子顕微鏡的観察
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概要
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Irradiation with a dental laser is claimed to induce analgesia, but the mechanisms and extent of the effects are uncertain. Therefore, Er : YAG laser irradiation (with a spot diameter 0.6mm, 70mJ, 10PPS, 10Sec) was performed on rat teeth, and responses of nerve fibers and nerve endings in dentin and pulp were investigated using an electron microscope at various timepoints after treatment (15,24,48 and 72hrs). Based on electron microscopic observation, the following results can be obtained : 1. Degeneration of collagen fibers were recognized in the upper and middle layers of the dentin. 2. Vacuolization and shrinkage of the odontoblastic process in the dentinal tubules were seen, and many nerve fibers and endings that touched the odontoblastic process were also degenerated. 3. Numerous nerve fibers and endings that touched the odontoblasts and pulp cells were degenerated. Cell membranes and vesicles in those nerve fibers and endings disappeared. 4. Degeneration of the myelin sheath and Shwann cells was also seen. These data indicate that laser treatment may diminish pain by disturbing the conduction pathway of sensation.
- 福岡歯科大学学会の論文
- 1999-09-30