Purpose: Implant component fractures are one of the most serious complications in implant treatment. With a better understanding of the risk factors for fracture in the preoperative, surgery, superstructure, and post-loading phases of implant treatment, low-risk treatment could reduce implant component fractures, leading to a better prognosis. The aim of this study was to clarify the risk factors for abutment and implant fractures that occur after loading, and to perform a retrospective, approximately 10-year follow-up study to explore the risk factors in each treatment phase. Methods: Subjects were fitted with an implant prosthesis between January 2008 and December 2009. In total, 1,126 Ankylos implants in 430 patients were included for analysis. Binary logistic regression analysis was performed to extract factors related to non-fracture and fracture of the abutment or implant as a dependent variable.
Among the genus Rothia, R. dentocariosa and R. mucilaginosa have been isolated from the human oral cavity. Currently, we reported that new selective media were developed for the isolation of each species. The clinical efficacy of the genus Rothia was evaluated from samples of oral cavities, such as pit and fissure plaque, buccal surface plaque, the buccal membrane surface, the dorsum of tongue, gingival crevicular fluid (GCF), and the mucosal surface of denture base using these selective media. R. dentocariosa and R. mucilaginosa were detected in all sites from pit and fissure plaque, buccal surface plaque, the buccal membrane surface and the dorsum of tongue. Therefore, both Rothia species are common members of oral cavity. R. mucilaginosa was predominant at the dorsum of tongue with 28.15% to total streptococci. Results show that the dorsum of tongue is the main habitation area of R. mucilaginosa. R. dentocariosa and R. mucilaginosa were also detected in GCF.These bacteria were detected to a certain extent on the mucosal surface of denture base.Therefore, it seems that these bacteria are members of denture plaque.
Infective agents are abundant in hospitals, and so medical staff members are often exposed to them. Although previous studies have highlighted the role played by the nasal flora of medical staff in the development of nosocomial infections, few studies have specifically investigated this issue. Six volunteer medical staff members, who worked at Nihon University Hospital at Matsudo, participated in this study. Nasal samples were obtained from the medical staff, and then the samples were cultured and evaluated using routine bacteriological study methods. Staphylococci were detected in the nasal samples of all of the medical staff. Staphylococcus epidermidis was the predominant species in their nasal cavities(71.3%) . None of the medical staff had been infected with methicillin-resistant Staphylococcus aureus(MRSA) , but four of six staff members possessed methicillinresistant coagulase-negative staphylococci(MR-CNS) .Medical staff members are both at risk of infection and also a potential source of nosocomial pathogens such as methicillin-resistant staphylococci. As a preventive measure against nosocomial infection, it might be necessary to continuously investigate the frequency of methicillin-resistant staphylococci in the nasal cavities of medical staff.
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