1) Fracture model
冠根纵折模型
2) crest root
冠根
1.
The crest root tissue of the without lateral root rice mutant RM109 and its wild type( Oryza sativa L.
Oochikara)的冠根组织形态进行比较 ,结果表明 ,大力品种可观察到侧根原基及侧根 ,而RM1 0 9均无 ;RM1 0 9的原生木质部间中柱鞘细胞数目减少 ,为大力的 77% ;后生木质部导管数增加 ,其导管I的数量为大力的 1 4 9% ,其导管Ⅱ的数量为大力的 3 2 1 % ,且导管排列散乱。
3) crown and root form
冠根形态
4) crown and root fracture
冠根斜折
1.
Objective: To avoid the affection of the injury to the healthy orth-teeth and the beauty because of the absorption of the alveolar bone after the teeth extraction,by remaining teeth with crown and root fracture under gingiva within 3 mm.
目的:探讨保留冠根斜折至龈下3 mm以内的患牙,避免拨除患牙后对健康邻牙的损伤,牙槽骨塌陷对美观的影响。
5) crown-root fracture
冠根折
1.
Objective:To observe the clinical effect of tooth extrusion with progressive methods for anterior teeth with crown-root fracture.
目的:观察用改进的固定矫治器进行牙根牙合向牵引治疗前牙冠根折的临床疗效。
6) Proportion between Crown and Root
冠根比例
1.
Analysis the Effect on the Stress of Wall of Root Canal by Different Proportion between Crown and Root;
不同冠根比例对根管壁应力影响的分析
参考词条
补充资料：根萝卜根尖纵切
李正理提供
[图]
说明：补充资料仅用于学习参考，请勿用于其它任何用途。