Methods: To observe the gaps between material and the walls of canals by scanning electron microscope, the apical sealing ability of material by dyepenetration method.
All filled teeth were used for dyepenetration 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。
3
Vad der Waals force of the aramid fibers, favor the penetration of dyes into the fibers and increase the dye pickup.