unmyelinated,unmedullated

Clinical investigation of causes of vertical root fracture in pulpless teeth;

无髓牙牙根纵裂原因分析

The　results　show　that,all　targets　of　the　tension　at　break,elongation at　break,percentage　of　elongation at　break　and　scale　degree　of　nonmedullar　fibers　of　two　experimental　groups　are　much　higher　than　those　of　comparative　group　(P<0.

结果表明：两种硫源对Ｆ２代杂种羊无髓毛的断裂强力、断裂伸长、断裂伸长率及鳞片度等指标均有极显著提高（Ｐ＜０。

The results showed that,all targets of stretched length,strength,degree of elasticity and sulphur content of nonmedullar fibers in those treatment groups were significantly higher or much higher than those of the other comparative groups (P<005 or P<001).

结果表明，二种硫源对Ｆ２代杂种羊无髓毛的伸直长度、强力、伸度及含硫量均有显著或极显著提高（Ｐ＜００５或Ｐ＜００１），对无髓毛的氨基酸总量、含硫氨基酸（胱氨酸）的含量也有提高。