[Effect of polishing method and time on the fitness of CAD/CAM zirconia ceramic crown].

Purpose: To compare the effect of different polishing methods and time treatment on the fitness of CAD/CAM zirconia ceramic crowns.

Methods: Sixteen intact maxillary premolars were randomly divided into two groups, group A was treated with silicon carbide burs, while group B was treated with tungsten steel burs. At different polishing time points of the same tooth, digital impressions of each group were obtained, which were used to manufacture CAD/CAM zirconium ceramic crowns.

[Effect of chronic sleep deprivation on condylar cartilage in rats].

Purpose: The aim of this study was to investigate the morphological changes of condylar cartilage of temporomandibular joint (TMJ) and the expression changes of IL-1β,TNF-α,IGF-1 and VEGF in condylar cartilage of TMJ by establishing a chronic sleep deprivation model in rats.

Methods: Sixty rats were randomly divided into experimental group, control group and recovery group. Modified multiple platforms method (MMPM) was used to build chronic sleep deprivation models in experimental and recovery groups.

EQUITY AND SATISFACTION OF COMMUNITY HEALTH SERVICES IN TONGLIAO CITY, INNER MONGOLIA.

We aimed to describe the human resources and apparatuses of community health service (CHS) in Tongliao City of China and investigate the differences between CHS centers and stations. Field investigations and questionnaire-based surveys were conducted in 120 CHS organizations of Tongliao City, which were selected by a stratified multistage random cluster sampling method. Data were collected on the human resources, medical apparatuses, and satisfaction of covered residents.