Abraham D. Abernethy

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The aims of this study were to investigate the effects of photodynamic therapy (PDT) on endodontic pathogens in planktonic phase as well as on Enterococcus faecalis biofilms in experimentally infected root canals of extracted teeth. Strains of microorganisms were sensitized with methylene blue (25 microg/ml) for 5 minutes followed by exposure to red light(More)
We have found that broadband light (380 to 520 nm) rapidly and selectively kills oral black-pigmented bacteria (BPB) in pure cultures and in dental plaque samples obtained from human subjects with chronic periodontitis. We hypothesize that this killing effect is a result of light excitation of their endogenous porphyrins. Cultures of Prevotella intermedia(More)
BACKGROUND AND OBJECTIVE Photodynamic therapy has been advocated as an alternative to antimicrobial agents to suppress subgingival species and to treat periodontitis. Bacteria located within dense biofilms, such as those encountered in dental plaque, have been found to be relatively resistant to antimicrobial therapy. In the present study, we investigated(More)
The salience of religion in society and health care has received increased attention. Recent developments in psychiatry reflect a broader view of religion that includes an appreciation of its adaptive and maladaptive dimensions. An examination of religious countertransferential and transferential reactions provides a framework for examining religious(More)
Diabetes complicates management in a number of disease states and adversely impacts survival; how diabetes affects patients with pulmonary hypertension (PH) has not been well characterized. With insulin resistance having recently been demonstrated in PH, we sought to examine the impact of diabetes in these patients. Demographic characteristics, echo data,(More)
The relationship between patent foramen ovale and migraine headache is a topic surrounded by much controversy. We present the case of a 45-year-old woman who underwent successful percutaneous mitral balloon valvuloplasty for rheumatic mitral valve stenosis, but had an immediate postprocedural course complicated by refractory migraine headaches.(More)
The effects of blue light at 455 nm were investigated on the bacterial composition of human dental plaque in vivo. Eleven subjects who refrained from brushing for 3 days before and during phototherapy participated in the study. Light with a power density of 70 mW/cm2 was applied to the buccal surfaces of premolar and molar teeth on one side of the mouth(More)
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