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Biomedical subjects

B Birgersson

Publications and source records attributed to B Birgersson.

4 recordsLinked to original sources
PubMed1998

Male-biased investment in fallow deer: an experimental study.

To find the causes of faster growth in males, we studied the growth and behaviour of six male and five female fallow deer, Dama dama, fawns, hand-reared on the same amount and quality of milk, and compared them with naturally reared fawns. The bottle-reared fawns grew more slowly. In particular, the difference in weight gain between bottle- and mother-reared fawns was significantly larger for males during the time when they consumed only milk. Male fawns also sucked harder and were more motivated to obtain milk. These results indicate that male fallow deer fawns receive more milk from their mothers than female fawns under natural conditions and, hence, maternal investment seems male biased in this species. Males grew slightly, but significantly, faster until 10 weeks old, which revealed that sex-differential growth during the period of maternal investment is possible in the absence of differential maternal investment. The results could not reveal whether this small difference in growth is brought about by physiological or behavioural differences between the sexes.Copyright 1998 The Association for the Study of Animal Behaviour

Journal Article↗
PubMed1982

Intraalveolar transplantation. (I). The use of autologous bone transplants in the periapical region.

Intraalveolar transplantation of teeth with unfavourable cervical root fractures were performed in 15 patients. The roots were surgically extruded on an average 4.5 mm, and autologous bone transplants were placed above the apical part to support the root. Temporary endodontic therapy was carried out before the transplantation in 10 patients and 3 weeks after transplantation in 2 patients. 3 of the teeth had old root fillings. Postoperative controls were made weekly during the first month, after 3 months, 6 months, 1 and 2 years. The roots had become stable in most cases after 3 weeks. The mobility grade was dependent on the extent of extrusion. Radiographic controls showed formation of a normal periodontal space around the roots after 3 months, but also minor root resorption in the most apical part in 10 of the cases. The resorption was, however, not progressive in nature and was limited to the apical part. Remodelling of the marginal bone contour around the transplanted roots was evident in 11 patients. Periapical destructions were found in 3 patients at the 2-year control. Crown therapy was carried out with due attention to the special prosthetic problems associated with preparation of small remaining root fragments with unfavourable crown/root ratio.

Adolescent↗
PubMed1981

The bone-anchored auricular episthesis.

Total ablation of the pinna gives an unsatisfactory cosmetic result which has to be corrected. Plastic surgery procedures are generally not very successful and some sort of episthesis is preferred by many. The attachment of an episthesis is, however, often a problem. This paper is a case report of a new type of episthesis fixation arrangement. In a first session four titanium screws were implanted into the temporal bone above and behind the external meatus with a technique ensuring minimal tissue violation. Three months later when these screws were firmly integrated in the living bone, skin-penetrating titanium abutments were connected and a gold bridge was adapted to the abutments. A silicon rubber episthesis was attached to the bridge with a snap fastener. Behind this new method of episthesis attachment are several years of clinical experience of titanium implants directly anchored into various living bones and allowed to permanently penetrate skin or mucous membrane.

Carcinoma, Squamous Cell↗