[Porphyromonas gingivalis induced interleukin-6 expression by Nod/Rip2-mediated signaling pathway].

Objective: To investigate into the signaling pathway of Porphyromonas gingivalis (P. gingivalis) on cytokine expression in human dental pulp cells (HDPC).

Methods: Anaerobic method was employed to culture P.

[Establishment of a model of intracellular infection on human dental pulp fibroblast by Porphyromonas gingivalisin vitro].

Objective: To establish a model of intracellular infection of human dental pulp fibroblast (HDPF) by Porphyromonas gingivalis in vitro.

Methods: HDPF was incubated with live Porphyromonas gingivalis with a multiplicitas of infection (MOI) from 100 for 0.5, 1.

[Effect of root canal curvature on canal length measurement on digital image of human lower mandibular permanent incisor].

Objective: To investigate the effect of canal curvature on measured precision in canal length of human lower mandibular permanent incisors imaged by direct digital radiograph.

Methods: With Trophy digital X-ray system, 299 Chinese lower mandibular permanent incisors were selected to take the direct digital X-ray photography in both facial to lingual (L-T) and proximal directions (M-D). Two operators familiar with endodontic knowledge estimated the canal length by means of on-screen DDR with 2-and 3-click measurements.

[Morphology of cross-sectioned root canal in Chinese mandibular permanent incisors].

Objective: To identify morphological features of cross-sectioned root canal in Chinese mandibular permanent incisors.

Methods: Twenty mandibular permanent incisors were selected in this study. The tooth roots were embedded in resin and transversely sectioned with a low-speed diamond saw.

[Shaping ability of multi-taper nickel-titanium files in simulated resin curved root canal].

Objective: To compare the shaping ability of ISO standard stainless steel K files and multi-taper ProTaper nickel-titanium files in simulated resin curved root canals. METHODS Thirty simulated resin root canals were randomly divided into three groups and prepared by stainless steel K files, hand ProTaper, rotary ProTaper, respectively. The amount of material removed from inner and outer wall and canal width after canal preparation was measured, while the canal curvature before and after canal preparation and canals aberrations were recorded.

[Radiographic anatomy of pulp chamber of Chinese permanent anterior teeth].

Objective: The aim of this study was to measure and analyze the anatomic characteristics of the pulp chamber of Chinese permanent anterior teeth radiographically.

Methods: There were 137 human permanent anterior teeth to be used. The crown length, crown width and crown thickness were measured by vernier caliper.