[Preliminary study of Simplant software in mandibular molar implantation].

Purpose: The purpose of the study was to investigate the clinical effect and implementation method of mandibular molar implantation using a CT machine combined with Simplant software so as to provide a safer and more reliable method for preoperative preparation of mandibular molar implantation.

Methods: CT/cone-beam CT (CBCT) examinations were applied among 10 cases selected into the study. The Simplant software was used to measure the distances between implantation point center and superior wall of inferior alveolar nerve canal (H1), buccolingual diameter (H2), mesiodistal diameter (H3), ginginal thickness(H4) and occlusal distance (H5).

[Cyclic strain promotes migration of human periodontal ligament cell via extracellular signal-regulated kinase (ERK) signaling pathway].

Objective: To study the effect of cyclic strain on migration of human periodontal ligament cell(hPDLC) and underlying mechanism.

Methods: The cultured hPDLC were subjected to 10% or 20%-elongation magnitude cyclic strain at frequency of 0.1 Hz by FX-4000T system for 6 or 24 hours-duration respectively, while the static group serves as control.