The Tooth Length, Crown Length, Root Length, Cervix Width, Cervix Thickness, Crown Width and Crown Thickness were measured with a vernier caliper.
用游标卡尺分别测量牙长、冠长、根长、颈宽、颈厚、冠宽和冠厚；
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This article mainly introduces the method that adopts gear caliper to measure the median diameter normal tooth thickness of double-line trapezoidal thread.