[Bone regeneration effect of injectable-platelet rich fibrin (I-PRF) in lateral sinus lift: a pilot study].

Purpose: The aim of the present research was to evaluate the regeneration effect of injectable-platelet rich fibrin (I-PRF) in lateral sinus lift.

Methods: A total of 46 cases, who lost their single posterior tooth with residual bone height of 3-5 mm, who needed lateral sinus lift, were treated in our hospital for implantation from June 2014 to Jun 2015. They were randomly divided into 2 groups.

[Cone-beam CT study of bone septa during maxillary sinus lift among Changzhou population].

Purpose: To observe the incidence, location, morphological characteristics of sinus septa among Changzhou population, and to investigate the relationship between maxillary posterior teeth loss and bony septum, and the guiding significance for sinus lift.

Methods: One hundred and twenty-four subjects were selected, the preoperative cone-beam CT (CBCT) data was analyzed by NNT software, which provided a three-dimensional measurement of the maxillary sinus septa. SPSS 13.

[Cost-benefit analysis on the replacement program of ordinary syringes by auto-disposal syringes in China].

Objective: To explore the feasibility of replacement of ordinary syringes by auto-disposal syringes (AD) in China.

Methods: Sampling survey was conducted in Hebei province to collect data on the direct medical spending of hepatitis B and their Disability Adjusted Life Year (DALY) losses. The financial burden on hepatitis B was calculated based on the result of field survey as well as through data-base of the Second National Health Services Survey of MOH in 1998.