【名词&注释】
溶解度(solubility)、氟化物(fluoride)、根尖周炎(periapical periodontitis)、染色法(staining)、慢性牙髓炎(chronic pulpitis)、牙发育(tooth development)、矫治器(appliance)、感觉神经(sensory nerve)、两者之间(between them)、羟磷灰石沉积
[单选题]活动矫治器(appliance)基托厚度为
A. 1.0~1.5mm
B. 1.5~2.0mm
C. 2.0~2.5mm
D. 2.5~3.0mm
E. 3.0~3.5mm