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Biomedical subjects

C Farr

Publications and source records attributed to C Farr.

At least 37 records · Page 2Linked to original sources
PubMed1996

The creation and integration of the high tech operatory.

Dentistry is in the early stages of a major technological transformation. For the most part, however, computers and many of the other technological tools dentists use to gather or display clinical information, including intraoral cameras, digital radiography, and multimedia systems, have been less productive then they could be. This paper examines several offices where this technology is currently in use to provide working models of how integrated technology can be implemented into operatories to make them more flexible, productive, and resourceful environments for clinicians, and assist the clinician in creating a corresponding improvement in patient care.

Computer Systems↗
PubMed1995

Acute and subchronic toxicity of 1,1-dichloro-1-fluoroethane (HCFC-141b).

The acute and subchronic toxicity of 1,1-dichloro-1-fluoroethane (HCFC-141b), a CFC alternative, was evaluated in several acute and subchronic studies to assist in establishing proper handling guides. Data from acute toxicity studies in rats and rabbits demonstrated that HCFC-141b has very low acute toxicity. HCFC-141b was not a skin irritant, but was a mild eye irritant, in rabbits and was not a skin sensitizer in guinea pigs. Skin application of HCFC-141b to rabbits at 2000 mg/kg body weight produced no adverse effects. Oral administration at 5000 mg/kg body weight did not cause any deaths or clinical signs of toxicity in rats. The 4-hr LC50 for HCFC-141b was about 62,000 ppm in rats. Repeated exposures of rats for 6 hr/day, 5 days/wk for up to 90 days at concentrations of 2000, 8000 or 20,000 ppm did not result in significant adverse effects. Minor, but dose-dependent, reductions in body weight were observed in male and female rats during the 90-day study. Decreased responsiveness was also observed in rats but only at 20,000 ppm. An increase in serum cholesterol or triglycerides was observed in male and female rats at 20,000 ppm, and in males at 8000 ppm. No specific organ pathology was noted in these subchronic inhalation studies. The no-observable-adverse-effect level (NOAEL) from these studies was 8000 ppm. Results from other studies demonstrate that HCFC-141b was not neurotoxic in rats. As with trichlorofluoroethane (CFC-11), a cardiac sensitization response to an intravenous epinephrine challenge occurred in dogs with HCFC-141b at 5000 ppm and higher concentrations in experimental screening studies.

Administration, Inhalation↗