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Biomedical subjects

R Persson

Publications and source records attributed to R Persson.

65 records · Page 4Linked to original sources
PubMed1979

On the relation between peripheral atherosclerosis and serum lipoproteins.

The occurrence and degree of peripheral atherosclerosis in 30 male patients with symptoms of intermittent claudication were studied by arteriography. The changes observed in the angiograms were codified. In all patients the concentrations of triglycerides and cholesterol were determined in whole serum and in the three major lipoprotein classes--very low density, low density and high density lipoproteins. These data were compared with those of a control material and were also correlated to the codified angiographic findings in each individual patient. Positive significant correlation was not found between the arteriographic changes and the serum concentrations of lipids and lipoproteins, which might be explained by an advanced stage of the disease where such relationships might not appear.

Adult↗
PubMedDate not supplied

Radiology in the Nordic Countries.

NEMT, Nordic Evaluation of Medical Technology, conducted a study in 1988-89 on the use and diffusion of diagnostic radiology technologies in Denmark, Finland, Iceland, Norway and Sweden, i.e. the Nordic Countries. The study analysed the responses to a questionnaire sent to all Nordic radiology departments. Our findings show a variation from about 500 to nearly 900 radiology examinations per 1000 inhabitants among the Nordic Countries. Some of the differences are explained by unique structural factors of the health care system in each country, even if they all provide comparable public health services. Other differences are explained by variations in medical practice, accessibility to new imaging modalities, and replacement policies. This paper summarizes the results of the study.

Diffusion of Innovation↗
PubMedDate not supplied

Dietary and salivary factors associated with root caries.

In this pilot study, dietary habits, microbial factors, and salivary factors in 20 older adults who had active decay on root surfaces were compared with those of 20 adults who had inactive or no root caries. In this case-control study, the groups were matched by sex and were of similar age. Subjects using medications known to induce dry mouth were excluded. Subjects completed a nutrition interview and a four-day food diary. Stimulated whole saliva flow rate, buffering capacity, levels of salivary lactobacilli with use of the Dentocult method, and S. mutans cultured on MSB agar were determined. The root caries group had a greater mean number of eating occasions per day (6.1 vs. 4.6), more frequent exposures to fermentable carbohydrates (5.8 vs. 4.2), and higher average daily sugars intake (133 g/day vs. 105 g/day) than the control group. Root caries subjects had significantly higher lactobacilli counts and less salivary buffering capacity. Within the root caries group, significant correlations were found with Root Caries Index and lactobacilli (r = 0.56) and S. mutans counts (rs = 0.50). These results show that frequent intake of simple sugars, high lactobacilli counts, and low saliva buffering capacity may be risk factors associated with root caries in older adults.

Aged↗
PubMedDate not supplied

Evaluation of titanium implants placed into simulated extraction sockets: a study in dogs.

The purpose of this study was to evaluate the effect of gap width on bone healing around implants placed into simulated extraction socket defects of varying widths in 10 mongrel dogs. All premolars were removed and the alveolar ridges were reduced to a width of 7 mm. Nine weeks later, a total of 80 implants, 10 mm long by 3.3 mm wide, were placed into osteotomy sites prepared to 3 different diameters in the coronal half, simulating extraction sockets. Three experimental sites, with gap sizes of 0.5 mm, 1.0 mm, and 1.4 mm, were created; the control sites had no gap. The depth of each defect was measured at the time of implant placement. All implants were stable at the time of placement. The dogs were euthanized 12 weeks after implant placement, and blocks containing the implants and adjacent bone were submitted for histologic evaluation. Clinically, all control and test sites healed, with complete bone fill in the defect. Percentages of bone-to-implant contact were measured histologically. As the gap widened, the amount of bone-to-implant contact decreased, and the point of the highest bone-to-implant contact shifted apically. These changes were statistically significant (P < .001). No statistically significant differences in bone-to-implant contact were found between the sites when the apical 4 mm of implants were compared. Within the limits of this study, the simulated extraction socket defects healed clinically, with complete bone fill, regardless of the initial gap size. However, the width of the gap at the time of implant placement had a significant impact on the histologic percentage and the height of bone-to-implant contact.

Analysis of Variance↗