Methods: To observe the gaps between material and the walls of canals by scanning electron microscope, the apical sealing ability of material by dye penetration method.

方法：采用染料渗漏法和扫描电镜观察新型聚氨酯液体根充材料与根管壁之间的密合度及其对根尖孔的封闭能力。

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All filled teeth were used for dye penetration test, and the depth that dye penetrated was measured between the restorations and the tooth structure under the metered microscope.

采用染料渗透实验，用测量显微镜测出染料渗入牙齿的深度。

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Vad der Waals force of the aramid fibers, favor the penetration of dyes into the fibers and increase the dye pickup.

通过采用化学助剂使芳纶分子之间的间隙增大，降低芳纶分子间的范德华力，有利于染料进入纤维内部，提高染料的上染率。

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Vad der Waals force of the aramid fibers, favor the penetration of dyes into the fibers and increase the dye pickup.

通过采用化学助剂使芳纶分子之间的间隙增大，降低芳纶分子间的范德华力，有利于染料进入纤维内部，提高染料的上染率。

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