表 1.

不同粗糙度金刚砂车针预备后的预备体和印模肩台表面的粗糙度

Surface roughness of abutment and impression shoulder after preparation of rotary instruments with different roughness

Items		Area 1	Area 2	Area 3	Area 4
Ra/μm	Abutment	37.31±6.37	22.94±6.83	17.96±8.11	13.53±5.62
	Impression	30.20±5.82	21.73±5.40	19.32±3.90	11.46±2.22
Rz/μm	Abutment	196.19±34.83	145.10±28.40	114.28±21.99	87.93±14.79
	Impression	185.61±32.46	136.76±27.87	126.10±19.69	79.68±16.12