[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. In group A, Bio-oss was used as a sole grafting material to fill the sinus; in group B, Bio-oss was used in combination with I-PRF to fill the sinus. Cone-beam CT (CBCT) was taken preoperatively, the residual bone height (RBH) was measured. The new formed bone height (NFBH) was measured immediately, 6 months and 12 months after surgery. ISQ values of implants were taken 4 months, 6 months postoperatively. SPSS 20.0 software was used for statistical analysis. RESULTS: All cases achieved primary healing, no infection or dehiscence was found. No significant difference of the RBH and NFBH was found between pre-operation or 12 months postoperatively, while significant difference was found immediately and 6 months postoperatively. The value of ISQ in group A was significantly higher than that in group B at 4 months(P＜0.05), and there was no significant difference between 2 groups 6 months after operation(P＞0.05). CONCLUSIONS: I-PRF is a safe and reliable material in sinus lift, which can effectively shorten the healing time and enhance the effect of osteogenesis.

[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 13.0 software package was used for statistical analysis. RESULTS: 33.87%（42/124）subjects had sinus septa, 27.42%（68/248）sinus had septa. 66.18% (45/68) of the septa were located in the middle region, 22.06% （15/68）in the posterior region, 11.76%（8/68） in the anterior region. The occurrence of sinus septa had no relation with gender, age and loss of teeth. CONCLUSIONS: The sinus septa can be observed by CBCT for the position, pattern, to predict the difficulty of the surgery, and enhance the success rate.