primary dentition occlusal 基本例句 乳牙牙合 Fixed orthodontic treatment is rarely used on primary dentition.固定正畸治疗一般很少在乳牙列上进行。 Objective This study observed plaque distribution on primary dentition to offer more scientific toothbrushing instruction.目的观察分析全口乳牙的菌斑附着状况。