SURFACE MODIFICATION OF DENTAL HARD TISSUES USING PULSED UV LASERS
In the present paper the main results achieved by the authors in the study of laser ablation and surface texturing of dentin and enamel with KrF excimer laser radiation will be reviewed. In dentin, the laser treatment leads to two distinct behaviors. When the tubules are roughly parallel to the laser beam, a coneshaped topography develops for fluences between 0.5 and 2 J/cm2. When the tubules are significantly tilted towards the laser beam or/and the fluence exceeds 2 J/cm2, the treated surface is flat and covered with resolidified material. The kinetics of cone growth can be described by a modified Johnson-Mehl-Avrami-Kolmogorov equation and the boundary lines delimiting fully developed cones define a Voronoi tessellation. In enamel, material is preferentially removed at the prisms sheaths leading to the formation of surface pits of a few micrometers. The laser treatment leads to a reduction of the organic matter content of dental hard tissues, without significantly affecting hydroxyapatite.
Rui Vilar Victor Oliveira
Departamento de Engenharia de Materiais, Instituto Superior Técnico Av. Rovisco Pais no1, 1049-001 Lisboa, Portugal
国际会议
第三届太平洋国际激光与光学应用会议(PICALO 2008)
北京
英文
82-87
2008-04-16（万方平台首次上网日期，不代表论文的发表时间）