[Chemical Constituents from Shoot of Phyllostachys edulis (II)].

Objective: To investigate the chemical constituents from the shoot of Phyllostachys edulis.

Methods: Normal-phase, reversed-phase silica gel, Sephadex LH-20 porous polymer gel column and HPLC chromatography were used for isolation. Spectroscopic methods (13C-NMR, 1H-NMR, DEPT and EI-MS) were used for identification.

[Experimental investigation of shear bond strength on orthodontic bonding on dental fluorosis after air abrading surface preparation technique].

Objective: To find a way to having higher bond strength on mottled enamel.

Methods: Sixty mottled enamel first bicuspid teeth extracted from fifteen patients needing orthodontic force were prepared and divided into four groups. Group A was routine acid etched, group B was air abraded, group C was etched by clearfil liner self-etching primer, group D was air abraded and then etched by clearfil liner self-etching primer.