The bored pile can lay directly on fallen capacity-holding layer when steel semi-closed pile end is layed into bore hole which can penetrate grit layer.

Part of pile foundation of a bulk cargo wharf extension project adopted semi-closed steel pipe piles.

Microleakage research on the effect of apical seal achieved after root resection with Er,Cr :YSGG laser;

【Objective】To compare the apical sealing ability of root canal filling using cold lateral condensation with one of the four methods of thermoplasticized gutta-percha.

Objective: To discuss the effect of apical seal achieved by the irradiation of Er,Cr :YSGG laser in retrograde filling, and to provide the important experimental basis for the clinical application of Er,Cr :YSGG laser.

An in vitro study on apical sealing abilities of three root canal sealers;

An experiment study on apical sealing effect of resinifying agent with Gutta Percha Points;

AIM: To compare the apical sealing ability of 3 obturation techniques for filling the root canals prepared by hand ProTaper NiTi instruments.

Effect of different root canal preparation instruments on the apical sealing ability in simulated resin root canals;

Objective To evaluate the apical sealing ability of obturated root canals prepared hand ProTaper with stainless steel K files in simulated resin root canals.

Effects of immediate post space preparation with different root canal preparation techniques on apical sealing ability in straight root canals;