[Rapid canine distalization through distraction of the periodontal ligament after reducing interseptal bone resistance].

Objective: To investigate the effect of rapid canine distalization through distraction of the periodontal ligament after reducing interseptal bone resistance.

Methods: Twenty canines in 11 patients who needed first premolar extractions were involved. A tooth-borne, custom-made distractor was bonded right after the first premolar extraction and the interseptal bone resistance reduction.

[Study on effect of snore guard to upper airway structure of normal occlusion people by magnetic resonance imaging].

Objective: To investigate the imagery changes of the upper airway and the surrounding soft tissues of local adults with non-apnea who used snore guard and to provide experimental data for the clinical diagnosis and treatment of obstructive sleep apnea syndrome (OSAS).

Methods: Thirty students with non-apnea from Hebei medical university were chosen, and magnetic resonance imaging (MRI) was used to measure the changes of the upper airway and the surrounding soft tissues after snore guards were used. SPSS 105 software was used to analyze statistically.

[The effect of hyaluronic acid external film on rats wound healing].

Objective: To observe the effect of an external film of hyaluronic acid (HA) on the rats wound healing.

Methods: Forty-eight SD rats were randomly separated into eight groups of 6 rats each. Bilateral dorsal cuts were performed on each rat, left wound was used as the experiment with HA external film and right wound was used as the control only with normal saline.