Purpose: The purpose of this study was to investigate the effects of implant collar design on marginal bone change and soft tissue response by an animal test. Materials and methods: Two types of Implant (Neobiotech Co. Seoul, Korea) that only differs in collar design were planted on two healthy Beagle dogs. The implants were divided into two groups, the first group with a beveled collar (Bevel Group) and the second group with "S" shaped collar (Bioseal group). Standardized intraoral radiographs were used to investigate the mesio-distal change of the marginal bone. Histological analysis was done to evaluate the bucco-lingual marginal bone resorption and the soft tissue response adjacent to the implant. Mann-Whitney test was done to compare the mesio-distal marginal bone change at equivalent time for taking the radiographs and the tissue measurements between the groups. Results: Radiographic and histological analysis showed that there was no difference in marginal bone change between the two groups (P>.05). Histological analysis showed Bioseal group had more rigid connective tissue attachment than the Bevel group. There was no difference in biological width (P>.05). Bevel group showed significantly longer junctional epithelium attachment and Bioseal group showed longer connective tissue attachment (P<.05). Conclusion: For three months there were no differences in marginal bone change between the Bevel group and the Bioseal group. As for the soft tissue adjacent to the implant, Bioseal group showed longer connective tissue attachment while showing shorter junctional epithelium attachment. There were no differences in biologic width. (J Korean Acad Prosthodont 2012;50:21-8)
Bio-aerosols can affect public health depending on the origin of bio-particles (bacteria, virus etc.). Here, we attempted to assess the applicability of laser-induced fluorescence (LIF) instrument with 405 nm to real-time monitoring of bacteria and viruscontaining aerosols. For the purpose, the LIF-based BDS (Bio-aerosol Detection System) was used. The bio-particle monitoring of the BDS is based on fluorescence signals from two wavelength ranges [short wavelength range (SWR): 430–550 nm & long wavelength range (LWR): 500–600 nm] and the scattering signal. Firstly, auto-fluorophores (NADH, riboflavin, tyrosine, tryptophan) were tested to expect the monitoring ranges of the BDS for the auto-fluorophores. NADH and riboflavin showed fluorescence signals from two wavelength ranges, and the fluorescence efficiency of NADH was higher in the SWR than in the LWR and that of riboflavin was reversed. While tyrosine and tryptophan showed negligible fluorescence signals from two wavelength ranges as expected. Next, the lyophilized powders of Bacillus subtilis (BS), virus vaccines [ND (Newcastle Disease), IB (Infectious Bronchitis)] and the bacteriophage MS2 were tested to investigate the monitoring ranges of the BDS for the bio-particles. Individual virus and bacteriophage have been expected no fluorescence signals because of the absence of NADH and riboflavin fluorescing by 405 nm. Nonetheless, all the tested samples showed the fluorescence signals in the size range of 2 to 15 μm, generally known as bio-aerosol size. Considering that atmospheric virus particles are released through the respiratory organs of their hosts, just as virus vaccines from chicken embryo and MS2 from E. coli, it can be thought in turn that the BDS can also monitor bio-aerosols including virus as well as bacteria. Taken together, we suggests that the BDS, LIF-based instrument with 405 nm, is applicable for real-time monitoring of virus-containing aerosols as well as other bio-aerosols by counting the fluorescence particles and resolving their particle sizes.
Bio-aerosols are important components of atmospheric aerosols, which can affect human health depending on the origin of biological particles. A real-time monitoring technology for bio-aerosols can rapidly provide information on the current state of biological particles in ambient environment, which substantially minimize the impact of hazardous biological particles. The aim of this study is to evaluate LIF (laser-induced fluorescence) technology on real-time monitoring of bio-aerosols by investigating the correlation between biomaterial concentration (cultured microbes or extracted DNA) and fluorescent particle concentration in ambient environment. For this, we used LIF instrument, BDS (Bio-aerosol Detection System), and analyzed the correlation coefficients from the collected data (the non-fluorescent particle concentration, the fluorescent particle concentration, the cultured microbial concentration, the extracted DNA concentration). Pearson’s correlation coefficients (r) from this study are as follows: 0.85 (p<0.001) between the fluorescent particle concentration and the cultured microbial concentration, 0.93 (p< 0.001) between the fluorescent particle concentration and the extracted DNA concentration, while 0.42 (p<0.01) between the non-fluorescent particle concentration and the cultured microbial concentration, 0.49 (p<0.01) between the non-fluorescent particle concentration and the extracted DNA concentration. It was also found that the size range of the fluorescent particles, which exhibited the highest coefficient for the extracted DNA concentration and the cultured microbial concentration, was 2 to less than 10 micrometer (μm), and their coefficients were 0.89 (p<0.01) and 0.8 (p<0.001), respectively. These results indicate that the fluorescent particles, especially in the range of 2 to less than 10 μm, are highly correlated with bio-aerosols rather than the non-fluorescent particles. Taken together, LIF technology is great for real-time monitoring of bio-aerosols by counting fluorescent particles and resolving particle sizes at ambient atmospheric environment.
The purpose of this study is to demonstrate the suitability of hydrogen peroxide(H 2 O 2 ) vapor system for platform interior decontamination. Geobacillus stearothermophilus biological indicator(BI) strips and a field tent were used as a biological simulant and as a simulated platform, respectively. Decontamination was performed based on injection rates and tent sizes with exposure time 60 minutes. We standardized the conditions for the field tent
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.