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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Surface integrity and removal mechanism in simulated dental finishing of a feldspathic porcelain.
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Surface integrity and removal mechanism in simulated dental finishing of a feldspathic porcelain.

机译：长石瓷在牙科模拟加工中的表面完整性和去除机理。

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摘要

Dental abrasive finishing of a fine-grained feldspathic porcelain was performed on a computer-assisted apparatus for simulation of a 2-degrees-of-freedom restorative operation with a dental handpiece and a coarse diamond bur of grit size of 106-125 mum. Finishing forces, surface roughness, and morphology were investigated as functions of finishing conditions. The tangential and normal forces were measured using a piezoelectric dynamometer and a data processing system. The results indicated that these forces increased with either the depth of cut or with the feed rate, in the ranges of 0.12-0.31 N and 0.45-1.09 N, respectively. However, an increase in either depth of cut or feed rate affected neither the surface roughness measured using a stylus profilometer nor the morphology observed under a scanning electron microscope. The finished porcelain surfaces were found to consist of the microfracture and chipping areas, ductile removal areas, smeared areas, and debris. Irregular fracture and chipping resulted from the extension of lateral/median cracks; ductile micromachining was attributed to the plastic deformation accompanied by distributed microcracks. It was determined that a combination of the microfracture and ductile micromachining was the primary mechanism for material removal.
机译：在计算机辅助设备上对细粒长石瓷进行牙科磨料抛光，以模拟带有牙科手机和粒度为106-125微米的粗金刚石针的2自由度修复操作。研究整理力，表面粗糙度和形态作为整理条件的函数。使用压电测功机和数据处理系统测量切向力和法向力。结果表明，这些力随切削深度或进给速度的增加而增加，分别在0.12-0.31 N和0.45-1.09 N的范围内。但是，切削深度或进给速度的增加都不会影响使用测针轮廓仪测量的表面粗糙度，也不会影响在扫描电子显微镜下观察到的形态。发现完成的瓷器表面由微裂缝和碎裂区，韧性去除区，涂污区和碎屑组成。横向/中部裂纹扩展导致不规则的断裂和碎裂;韧性的微加工归因于塑性变形和分布的微裂纹。已确定，微断裂和韧性微加工的结合是去除材料的主要机理。

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