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Biomedical subjects

T Dahl

Publications and source records attributed to T Dahl.

At least 73 records · Page 4Linked to original sources
PubMed1977

[Pair comparison of the jaw development in monozygotic twins].

Investigations of the development of the dentition and skeletal patterns in 14 pairs of monozygotic twins for approximately 10 years are the basis of a pair comparison. Following the measurements of the plaster casts and the cephalometric radiographs we can state, that in this group of identical twins there are small intra-pair variations.

Cephalometry↗
PubMed1977

Economics, management, and public health nutrition.

Research has shown that including a nutritional functional area in comprehensive health care delivery can reduce the total cost per registrant. The savings occur when nutritionists substitute for more costly medical personnel in a team-care setting. Further research has demonstrated that the cost of nutritional care is related to the performance of nutritional staff, i.e., productivity, which may be improved as much as 25 to 70% through simple managerial techniques. The implications for nutritional planning and operations are discussed. Nevertheless, the greatest potential for improving nutritional health rests with the patient himself. Thus, the future orientation in public health nutrition must be directed toward the problems of shifting the major part of the responsibility from the provider to the patient, with accompanying competence in self-care and health maintenance. A promising approach to the idea of greater patient responsibility and autonomy is the so-called Vinland Center concept. Originally developed in Norway, a center incorporating the principles is now being planned in Minnesota and is expected to begin operation in 1979. Funds for the planning effort were given to the U.S. as a Bicentennial gift from Norway. The concept is explained.

Cost-Benefit Analysis↗
PubMed1975

[The interesting case. 6-year follow-up of a patient with atypical root length of various teeth].

Six-year observations of a female patient (13 years of age at treatment beginning) in whom the roots of certain teeth were extremely short (the causes of which being unknown) revealed no changes in the degree of resorption and so further root resorptions. The growth of the roots of these teeth (which had not fully developed at treatment beginning) progressed without disturbances. The author is of opinion that these atypical root lengths are sequelae of a temporary disturbance of the process of growth, the causes of which are unknown.

Adolescent↗
PubMed1975

[The narrowing of the support area by premature tooth loss and caries in various abnormal alignments].

On the basis of the findings from 1470 patients referred for orthodontic treatment, the authors analyse, for various types of anomalies, the sequelae of untreated proximal caries and premature extractions in the supporting areas of the upper and the lower jaw. The results obtained indicate that the premature loss of deciduous teeth causes, in case of malalignment associated with lack of space, secondary alterations.

Dental Caries↗
PubMed1975

[Dental findings in children with hearing disorders].

Tooth findings are reported of 972 children aged between 3 to 18 years who suffer from impaired hearing. Logopedic pupils had significantly more tooth anomalies than those with impaired and normal hearing. The deaf pupils had significantly less dysgnathias than others with impaired hearing. As compared to those with normal hearing there was no significant difference.

Adolescent↗
PubMedDate not supplied

Kinetic studies of the degradation of oxycarbonyloxymethyl prodrug of Adefovir and Tenofovir in solution.

The decomposition kinetics of bis-POC PMEA and bis-POC PMPA followed pseudo-first order kinetics with the corresponding mono-POC ester detected as the only observable degradation product for all the pH values studied. The rates of hydrolysis of bis-POC PMEA over the pH range studied was described by [formula: see text] The 18O incorporation studies revealed that hydrolysis of bis-POC PMEA at pH 7.0 primarily proceeds via P-O cleavage with an additional minor pathway involving C-O bond cleavage. Hydrolysis of bis-POC PMPA was found to be about 2 fold slower than bis-POC PMEA at pH values above 6.0.

Adenine↗
PubMedDate not supplied

Rapid intraoperative construction of autologous small caliber blood vessels.

Autologous pericardium, briefly tanned in glutaraldehyde, is an excellent biomaterial when used in various cardiac procedures, including repair and replacement of heart valves. A generalized lack of calcification and an absence of inflammatory response in these combined experiences has led the authors to consider the use of treated autologous pericardium for the construction of substitute small caliber blood vessels. Rapid, intraoperative construction of a vascular graft from autologous pericardium, briefly treated in 0.62% glutaraldehyde, is accomplished through the use of two concentric, mating helical stents that support a rectangular pattern of tissue into a cylindrical, nonkinking, compliant conduit. A disposable automated assembly tool provides for precise assembly of the tissue and stents. The tools and methods for construction of vascular grafts from nonvascular tissue are known as the Rapidgraft (Ramus Medical Technologies, Santa Barbara, CA). The technique can be used with any suitable tissue. Accelerated fatigue test studies have confirmed that stent supported pericardial grafts are capable of withstanding physiologic pressures and flows beyond 7 equivalent years. Six autologous pericardial grafts measuring 5 mm in diameter by 5.5 cm in length showed 100% patency beyond 5 months in a growing calf carotid artery model. Pathological examination of explanted grafts confirm the presence of a continuous endothelial lined surface, infiltration of the tissue by fibrous connective tissue such that the individual layers of the pericardial vessel wall could not be identified, and there was no inflammatory response. Based on the encouraging results in animal studies, a small multicenter clinical trial has been initiated to evaluate the performance of the Rapidgraft as a replacement conduit for the radial artery in cases in which the radial artery has been harvested as a coronary artery bypass conduit. Results from the radial artery trial will be used as an indication to evaluate the Rapidgraft as a coronary artery substitute. We conclude that the material properties, including the biological origin of a vessel wall, may be significant determinants of graft patency, and that the Rapidgraft may be an answer to the need for small caliber arterial graft with the potential for long-term patency and durability.

Blood Vessel Prosthesis↗