Oho T, Morioka T
Department of Preventive Dentistry, Faculty of Dentistry, Kyushu University, Fukuoka, Japan.
Caries Res. 1990;24(2):86-92. doi: 10.1159/000261245.
A possible mechanism of acquired acid resistance of lased enamel was proposed on the basis of the investigations of optical properties, compositional and structural changes and permeability of lased and unlased human dental enamel. Lased enamel showed a high positive birefringence, suggesting the formation of 'microspaces' in enamel. No new products were found, though a decrease of lattice strain and a slight a-axis contraction were recognized in lased enamel compared with unlased enamel. The contents of water, carbonate and organic substances were reduced in lased enamel. Gradual changes of birefringence were observed in lased enamel during treatment with acid solutions, and this change was attributed to mineralization of the microspaces. The ions released by an acid decalcification would be trapped in the microspaces in lased enamel, whereas such ions diffuse to the surrounding solution in unlased enamel.
基于对经激光处理和未经激光处理的人牙釉质的光学性质、成分和结构变化以及渗透性的研究，提出了激光处理牙釉质获得抗酸性的一种可能机制。经激光处理的牙釉质呈现出高正双折射，表明在牙釉质中形成了“微空间”。尽管与未经激光处理的牙釉质相比，经激光处理的牙釉质晶格应变减小且a轴略有收缩，但未发现新产物。经激光处理的牙釉质中水分、碳酸盐和有机物质的含量降低。在用酸溶液处理过程中，经激光处理的牙釉质双折射逐渐变化，这种变化归因于微空间的矿化。酸脱钙释放的离子会被困在经激光处理的牙釉质的微空间中，而在未经激光处理的牙釉质中，此类离子会扩散到周围溶液中。
