抛光过程中复合树脂表面粗糙和光泽度的变化

目的探讨抛光过程中复合树脂表面粗糙度和光泽度的变化规律。方法测定９种复合树脂抛光前的压接面及经过２４０目、３２０目、４００目、６００目、８００目、１２００目金刚砂纸抛光后抛光面的粗糙度值和光泽度值。结果随着由粗至细逐级抛光，粗糙度值稳步下降，至８００目时均恢复至抛光前的程度；而光泽度值在６００目以前变化甚微，８００目时骤然回升，至１２００目时有５种树脂已达到或超过抛光前的水平。结论复合树脂必须抛光至一定精细程度，才能获得理想的滑泽表面。

Changes of surface roughness and glossiness of the composite resins during polishing

Objective To investigate the changes of surface roughness and glossiness of the composite resins during polishing. Methods Nine conventional composite resins were evaluated. Composite specimens were polymerized on celluloid strip, so, smooth surfaces were obtained for each specimen, then the smooth surface of the specimens were sequentially polished with diamond polishing papers grits #240,#320,#400,#600,#800 and #1200. The roughness and glossiness of the central surface at 60 reflex angle were measured. Results The results showed that the values of roughness decreased steadily when specimens were polished with sequential polishing paper from coarse to fine one. A further polishing with grit #800, the values of roughness resumed to the prepolishing values in all the composite specimen. The change of values of glossiness is very small within polishing with #240#600. A further polishing with grit #800 and #1200, the values of glossiness increased jumpily. The values of glossiness of five composite resins reached or surpassed the level of prepolishing. Conclusion This study indicates that fine surface would not be gained until the composite resins were polished with grit #800 and #1200 polishing paper.