The novel non-leachable poly (quaternary ammonium salt) (PQAS)-containing antibacterial glass- ionomer cement has been developed. Compressive strength (CS) and S. mutans viability were used as tools for strength and a...The novel non-leachable poly (quaternary ammonium salt) (PQAS)-containing antibacterial glass- ionomer cement has been developed. Compressive strength (CS) and S. mutans viability were used as tools for strength and antibacterial activity evaluations, respectively. All the specimens were conditioned in distilled water at 37?C prior to testing. Commercial glass-ionomer cement Fuji II LC was used as control. With PQAS addition, the studied cements showed a reduction in CS with 25-95% for Fuji II LC and 13-78% for the experimental cement and a reduction in S. mutans viability with 40-79% for Fuji II LC and 40-91% for the experimental cement. The experimental cement showed less CS reduction and higher antibacterial activity as compared to Fuji II LC. The long-term aging study indicates that the cements are permanently antibacterial with no PQAS leaching. It appears that the experimental cement is a clinically attractive dental restorative that can be potentially used for long- lasting restorations due to its high mechanical strength and permanent antibacterial function.展开更多
Fraunhofer HHI正式宣布了下一代视频编解码标准H.266/VVC(Versatile Video Coding),本文利用官方H.266编码模型,编写相关测试程序用于实现8K视频的PSNR及PQA分析,对4K/8K VR的H.266编码进行PSNR损伤及PQA评价,解决现有分析软件均不支...Fraunhofer HHI正式宣布了下一代视频编解码标准H.266/VVC(Versatile Video Coding),本文利用官方H.266编码模型,编写相关测试程序用于实现8K视频的PSNR及PQA分析,对4K/8K VR的H.266编码进行PSNR损伤及PQA评价,解决现有分析软件均不支持8K分辨率及对应10比特分析问题。展开更多
文摘The novel non-leachable poly (quaternary ammonium salt) (PQAS)-containing antibacterial glass- ionomer cement has been developed. Compressive strength (CS) and S. mutans viability were used as tools for strength and antibacterial activity evaluations, respectively. All the specimens were conditioned in distilled water at 37?C prior to testing. Commercial glass-ionomer cement Fuji II LC was used as control. With PQAS addition, the studied cements showed a reduction in CS with 25-95% for Fuji II LC and 13-78% for the experimental cement and a reduction in S. mutans viability with 40-79% for Fuji II LC and 40-91% for the experimental cement. The experimental cement showed less CS reduction and higher antibacterial activity as compared to Fuji II LC. The long-term aging study indicates that the cements are permanently antibacterial with no PQAS leaching. It appears that the experimental cement is a clinically attractive dental restorative that can be potentially used for long- lasting restorations due to its high mechanical strength and permanent antibacterial function.
文摘Fraunhofer HHI正式宣布了下一代视频编解码标准H.266/VVC(Versatile Video Coding),本文利用官方H.266编码模型,编写相关测试程序用于实现8K视频的PSNR及PQA分析,对4K/8K VR的H.266编码进行PSNR损伤及PQA评价,解决现有分析软件均不支持8K分辨率及对应10比特分析问题。
