Biomedical subjects

S Weida

Publications and source records attributed to S Weida.

5 recordsLinked to original sources

PubMed1998

Histological findings in guided bone regeneration (GBR) around titanium dental implants with autogenous bone chips using a new resorbable membrane.

The aim of this study was to test the value of the new polydioxanone-membrane (PDS, Ethicon, Norderstedt, Germany) in combination with autogenous bone as a spacer for guided bone regeneration of denuded implant surfaces compared to simple augmentation. Forty implants were selected for 20 test cases (with membrane) and 20 control cases (without membrane) and were distributed randomly in 19 patients who were treated according to a standard protocol and examined. The defects were filled with autogenous bone chips, harvested interforaminally or locally, and were covered by the PDS membrane within the test group (control group: periosteum). The membranes were fixed with Memfix screws and cover screws. Seven membranes became exposed and were removed before reentry. Within the control group, three augments were sequestered. After 6 months, reentry was performed, the healing results were observed clinically, and biopsies were taken. The test group, including the seven cases with early removal of the membrane, showed that bone had filled in the defects in 95% of test cases, compared with 60% for the control group. The results of this study show that single augmentation of defects exceeding 9 mm2 is not sufficient. The membrane used in this investigation may be helpful for guided bone regeneration (GBR) at denuded screw thread sites in implant dentistry.

Adult↗

PubMed1989

Banning smoking in a children's hospital: are employees supportive?

This study surveyed 762 professional and auxiliary employees in a large urban children's hospital to assess readiness for a total ban on smoking. The prevalence of never smokers was 63.1%, former smokers was 21.1%, and current smokers was 15.1%. Among nonsmokers, 83% indicated that a children's hospital should be smoke-free. The attitudes of former smokers were almost identical to those of never smokers. Less than half of current smokers (43%) agreed with a ban on smoking which suggests some support for a smoke-free setting even among smokers. In multivariate analysis, smokers, however, were eight times less likely to agree with such a policy, independent of age, sex, and occupation. This study suggests that the majority of employees are supportive of a total ban on smoking but that special efforts to help smokers stop smoking may enhance the effectiveness of a policy banning smoking in a children's health care facility.

Adult↗

PubMed1989

A case-control study of aplastic anemia.

A case-control interview study of aplastic anemia was conducted to evaluate suspected risk factors. Cases (N = 59) newly diagnosed during 1975-82 at 25 Baltimore area hospitals were compared with 59 individually matched (on age, sex and race) controls selected by random digit dialing. The average educational level was less for cases than controls. The major job-related findings were a significant excess for occupational exposure to paint (OR = 6.1; 95% C.I. = 1.2-29.7), further substantiated by a positive dose-response relationship, although painters were not at excess risk. An increased risk of occupational exposure to viruses (OR = 9.0; 95% C.I. = 0.8-105.6) was noted. Additional evidence implicating viral factors included a significant association with prior history of hepatitis (OR = 9.0; 95% C.I. = 1.0, 84.2) and an elevated risk for pre-diagnostic receipt of blood transfusions (OR = 7.1; 95% C.I. = 0.7-68.4). Risks were not increased for other occupational, residential, personal, or medical treatment exposures or for other viral infections, medical conditions, smoking or alcohol consumption prior to diagnosis. Because of the small number of subjects studied and the multiple comparisons examined, these findings should be interpreted cautiously and confirmation should be undertaken in larger, population-based studies.

Adolescent↗

PubMed1986

Smoking behavior and attitudes toward smoking among hospital nurses.

We examined smoking prevalence, smoking behavior, and attitudes toward smoking in hospitals in 1,380 respondents among 1,719 registered nurses in a large urban teaching hospital. In this group, current prevalence of smoking in hospital nurses (22 per cent) was less than women in the general population (29 per cent). Smoking nurses were more likely than nonsmokers to hold attitudes which potentially reduce their efficacy in helping patients to stop smoking.

Adult↗

PubMed1985

Incidence of aplastic anemia in metropolitan Baltimore: a population-based study.

Incidence rates for aplastic anemia (AA) so far have been unavailable for defined populations in the United States. A study was carried out in the Baltimore Standard Metropolitan Statistical Area (SMSA) to examine the incidence rates for aplastic anemia from 1970 through 1978. Cases of AA (N = 118) were identified through medical records (N = 77) in SMSA hospitals and death certificates (N = 41). All medical charts were reviewed by an oncologist-hematologist for validation purposes. Among whites, average annual age-adjusted incidence rates per million were higher in males (7.1) than in females (5.4), whereas in nonwhites, females had a higher rate (7.3) than males (4.7). None of the sex differences was statistically significant. Age-specific incidence rates were consistently low in young ages, with an exponential increase after age 40. Examination of time trends did not suggest changes in whites, although in blacks, mainly in males, there was a suggestion of a temporal increase. However, rates in blacks were based on small numbers, and trends were not statistically significant. An inconsistent sex differential, as well as the relative stability of rates over time at least in whites, suggests that although sexes may have different types of exposures, occupational exposures and changes in environmental factors over time cannot entirely explain the occurrence of AA in the population. In addition, the age pattern suggests that future studies should examine etiologic agents separately for the younger and the older subjects with AA.

Adolescent↗