The close underdrainage is introduced to solve the problem of setting underdrainage to lower the water table but difficult to set the outlet, where there is no natural water system but there is seepage under the upper terrain below the first shallow aquifer.

Study on generalized model of the semi-closed cutoff wall of multi-structure levee foundation;

The effect of pit and fissure sealing on 358 deciduous and permanent teeth;

Contrast of clinical effect between pit and fissure sealant with and without nurse;

After oral examination, the intervening group was intensified oral health instruction, then pit and fissure sealant(PFS) and fluoride varnish were carried on tooth 46.

After oral examination,the intervening group received oral health instruction,then pit and fissure sealant(PFS) and fluoride varnish were carried on teeth.

Investigation on the effect of fissure sealing on prevention of dental caries in six-year-teeth;

Clinical observation of fissure sealing technique for motar teeth pigmentation fissure in adults;

Objective To observe the clinical effect of Ketac-Molar glass ionomers used as pit and fissure Sealant in the prevention of fissure caries with fissure sealing.