Background Autologous platelet concentrate has been widely used to encourage the regeneration of hard and soft tissues. Up to now, there are three generations of autologous platelet concentrates. Many studies have shown that the three autologous concentrates have different effects, but the specific diversities have not been studied. The purpose of this study was to explore and compare the effects of platelet-rich fibrin, concentrated growth factor and platelet-poor plasma on the healing of tooth extraction sockets in New Zealand rabbits. Methods A total of 24 healthy male New Zealand white rabbits aged 8–12 weeks were selected. The experimental animals were randomly divided into four groups: three experimental groups were respectively implanted with PPP, CGF and PRF gel after bilateral mandibular anterior teeth were extracted, and the control group did not implant any material. The alveolar bone of the mandibular anterior region was taken at 2, 4 and 8 weeks after operation. The height and width of the extraction wound were detected by CBCT, the growth of the new bone was observed by HE and Masson staining, and the expression of osteogenic genes was detected by real-time PCR. Data were analyzed using IBM SPSS statistical package 22.0. Results The radiological results showed that alveolar bone resorption in all groups gradually increased over time. However, the experimental groups showed lower amounts of bone resorption. The histological results showed that new bone formation was observed in all groups. Over time, the new bone trabeculae of the CGF group became closely aligned while those in the PPP and PRF groups remained scattered. PCR results showed that the expression of BMP-2 and ALP was higher in the experimental groups than the control group. Conclusion In conclusion, the application of PRF, CGF and PPP in tooth extraction sockets effectively promoted bone regeneration. CGF showed more effective bone induction and tissue regeneration ability in the long term.
The HIV epidemics in some areas of Yunnan Province, southwestern China, are close to becoming generalized, demanding the need for a better understanding of sexually transmitted disease (STD) and heterosexual HIV risk. While female heterosexual risk is captured by sentinel surveillance, less is known about clients of commercial sex workers and other subsets of men at increased risk of STD/HIV. A convenience sample of 232 miners in townships of Yunnan Province completed a questionnaire and provided specimens for STD/HIV testing. Relative prevalences of HIV, gonorrhea, and chlamydia among sexually experienced miners surveyed were 0.5% (1/182), 0.5% (1/182), and 9.3% (17/182), respectively. Chlamydia seropositivity was significantly associated with receiving less education (p = 0.03). Among all respondents, 9.4% admitted to purchasing sex, 82.9% had not used a condom in the last 6 months, and substantial gaps in knowledge about STD/HIV were apparent. Because preventing heterosexual spread of HIV is crucial in this area of China to prevent a generalized epidemic, better understanding and designing low literacy interventions targeted at sex worker clients and similar subsets of high-risk migrants may be warranted.
Background:Autologous platelet concentrate has been widely used to encourage the regeneration of hard and soft tissues. Up to now, there are three generations of autologous platelet concentrates. Many studies have shown that different autologous platelet concentrates have different healing effects. However, these differences still need to be further verified and discussed. The purpose of this study was to explore and compare the effects of platelet-rich fibrin, concentrated growth factor and platelet-poor plasma on the healing of tooth extraction sockets in New Zealand rabbits. Methods:A total of 24 healthy male New Zealand white rabbits aged 8-12 weeks were selected. The experimental animals were randomly divided into four groups: three experimental groups were respectively implanted with PPP, CGF and PRF gel after bilateral mandibular anterior teeth were extracted, and the control group did not implant any material. The alveolar bone of the mandibular anterior region was taken at 2, 4 and 8 weeks after operation. The height and width of the extraction wound were detected by CBCT, the growth of the new bone was observed by HE and Masson staining, and the expression of osteogenic genes was detected by real-time PCR. Data were analyzed using IBM SPSS statistical package 22.0.Results: The radiological results showed that alveolar bone absorption in all groups gradually increased over time. However, the experimental groups showed lower amounts of bone absorption. The histological results showed that new bone formation was observed in all groups. Over time, the new bone trabeculae of the CGF group became closely aligned while those in the PPP and PRF groups remained scattered. PCR results showed that the expression of BMP-2 and ALP was higher in the experimental groups than the control group.Conclusion: In conclusion, the application of PRF, CGF and PPP in tooth extraction sockets effectively promoted bone regeneration. CGF showed more effective bone induction and tissue regeneration ability in the long term.
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