[A control study on crowns and bridges on root filled teeth].
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Bone Resorption↗
Biomedical subjects
T Rantanen
Publications and source records attributed to T Rantanen.
Audiometric and electronystagmographic studies of patients with traumatic skull injuries.
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Accidents, Traffic↗
Kinetics of phototoxicity in trioxysalen bath psoralen plus ultraviolet A photochemotherapy.
A trioxysalen bath is a safe alternative to systemic 8-methoxypsoralen in long-term psoralen plus ultraviolet A (PUVA) treatment. The kinetics of its main side-effect, the strong phototoxicity, has not been thoroughly studied. This study determined the degree and persistence of phototoxicity after a single 10 min bath at a trioxysalen concentration of 0.33 mg/l. The buttock skin of 16 healthy volunteers was irradiated with UVA 10 min, and 1, 3, 9 and 24h after the bath. The minimal phototoxic dose (MPD) was assessed 48, 72 and 96h after the bath. In general, the 96 h reading showed the lowest values of MPD; for example, a median of 0.14 J/cm2 (95% confidence interval 0.10-0.14 J/cm2) at sites irradiated 10 min after the bath. The values increased progressively with later irradiation, and the maximum dose applied, 18.32 J/cm2, failed to produce any redness when irradiation was given 24 h after the bath. Substantial phototoxicity persists up to at least 9h after the trioxysalen bath, making it wise for patients to avoid sunshine for at least the rest of the day.
Adult↗
Association of muscle strength with maximum walking speed in disabled older women.
Our aim was to study the association of lower limb strength with maximum walking speed in disabled older women and to try to detect the reserve capacity threshold for maximum walking speed and the minimum strength required for walking at a speed of 1.22 m x s(-1), which is required in crossing signaled intersections. The data are from the baseline of Women's Health and Aging Study, a population-based study on causes and course of disability. Altogether, 1,002 disabled women participated in the tests, which took place at their homes. Maximum isometric hip flexion and knee extension forces were measured on both sides using a handheld dynamometer. For analytic purposes, knee extension torque/body mass ratio (KET/BM) was calculated. Maximum walking speed was measured with a stopwatch during a 4-m walk. KET/BM had a significant effect on walking speed after controlling for number of chronic conditions, balance, use of walking aid, joint pain, age, and body height and mass. A total of 42.3% of the variation in maximum walking speed was explained by these variables. The cumulative percentage distribution of KET/BM of those able to attain a maximum walking speed of 1.22 m x s(-1) (n = 148) was flat to the level of 1.1 N x m x kg(-1), after which it turned upward, indicating that the probability of attaining 1.22 m x s(-1) started to increase after that level. By using segmented linear regression analysis, 2.3 N x m x kg(-1) was found to be the cutoff point beyond which an increase in KET/BM did not correspond to an increase in maximum walking speed. Muscle strength was positively but not linearly associated with maximum walking speed. Strength testing may help to identify people close to functional thresholds and, thus, at risk of impaired walking, who would benefit most from strengthening exercises.
Activities of Daily Living↗
Technical variations in clinical ostial patency tests.
The usefulness of nasopharyngeal-antral pressure difference recording as a part of clinical ostial patency testing is demonstrated by statistical calculations from 507 patency tests. This method offers a quick confirmation of the comparison of pressure variation measured by anterior rhinomanometry and by antral pressure recordings which are the main elements of a consecutive patency test. In addition, the nasopharyngeal-antral recording has many of the advantages of a simultaneous patency test. When this difference recording is applied, the nasal reference pressure recording can also be omitted without any loss of information sought by the patency test.
Humans↗
Ostial resistance. Its variations and correlations to the patency test results.
Resistance measurement is a simple and practical mean of testing ostial function. The present study showed that the results of measuring the ostial resistance varied according to the amount of antral secretion. For that reason the postirrigational mean resistance is about 1/5 of the highest mean resistance in acute maxillary sinusitis. The average ostial resistance in healthy persons is 2.5 cm of water and in acute maxillary sinusitis at diagnostic puncture, 13.0 cm of water, and at the end of treatment, 3.3 cm of water. There are discrepancies between the results of resistance measuring and patency tests in 10-30% of cases. It is difficult to say whether these are due more to faults in the measuring techniques of the resistance or the patency. As an ostial function test, resistance measuring is quantitative and the testing of patency qualitative.
Acute Disease↗