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Biomedical subjects

K Ekstrand

Publications and source records attributed to K Ekstrand.

30 records · Page 2Linked to original sources
PubMed1986

Implant-fixed, dental bridges from carbon/graphite fibre reinforced poly(methyl methacrylate).

Conventional bridge frameworks of gold alloys are expensive. A method for preparing bridges from carbon/graphite reinforced poly(methyl methacrylate) on titanium implants is described. After a separate in vitro investigation of both heat- and auto polymerized systems with different quantities of carbon/graphite fibres, the material system was selected. Clinical data on 11 patients with observation periods from 11 to 24 mnth indicated that the carbon/graphite fibre reinforced polymer bridges functioned satisfactorily.

Carbon↗
PubMedDate not supplied

Function of irradiated polymorphonuclear leukocytes obtained by buffy-coat centrifugation.

Several studies suggest that transfusion of polymorphonuclear leukocytes (PMNs) may be beneficial in the treatment of septic neonatal patients. Because of expense, donor availability, and the technical effort involved in obtaining PMNs by intermittent or continuous flow leukapheresis, buffy coat centrifugation of whole blood has been suggested as an alternative source. An in vitro study was performed to determine whether PMNs collected by this method have adequate oxidative and migratory function measured by chemiluminescence (CL) and chemotaxis under agarose (CT), respectively. Whole blood samples from six adult volunteers were drawn into citrate-phosphate-dextrose-adenine-one and stored at 4 degrees C for 0 to 48 hours. One-half of each sample was irradiated with 1500 rads. PMNs isolated from the buffy coat of these samples had greater than 80 percent normal CT and CL following 0 to 28 hours of storage in whole blood. Irradiation caused no depression in function. Units of whole blood yielded 1.11 +/- 0.40 X 10(9) PMNs per unit. This study indicates that transfusion of radiated PMNs obtained from stored whole blood that is less than 28 hours old is reasonable to use in studies involving PMN transfusions.

Adult↗
PubMedDate not supplied

Ectodermal dysplasia with partial anodontia: prosthetic treatment with implant fixed prosthesis.

In cases with severe hypodontia, it is necessary to make a treatment plan in collaboration with different disciplines in dentistry, with the treatment plan formed in such a way that many possibilities for treatment could be used in the future. Partial and full dentures combine simple methods with good esthetic and functional results in the growing individual. They also afford time to assess the patient with regard to more extensive restorative treatment. Patients suffering from severe hypodontia have so far been very dependent on their remaining teeth. The case reported covers a twenty-year period of dental treatment, and shows a new possibility provided by osseointegrated implants.

Adult↗
PubMedDate not supplied

An international comparative multicenter study of assessment of dental appearance using computer-aided image manipulation.

PURPOSE: The aim of the present investigation was to perform an international multicenter comparison of dental appearance as evaluated by dentists, dental technicians, and nondental subjects. MATERIALS AND METHODS: The participants were drawn from three groups: 203 dentists, 197 dental technicians and 254 nondental subjects. The methods developed in a previous study in Sweden were applied again in seven centers located in six countries. A questionnaire, accompanied by five sets of computer-manipulated images portraying one man and one woman, was used to prompt and record responses to different aspects of dental appearance and function. RESULTS: The questionnaire revealed that both the dental appearance and function of teeth were important to most of the participants, but three quarters of the participants did indicate that good dental function was more important that esthetics. More women (30%) than men (18%), however, placed greater importance on appearance. Age or gender did not influence judgments of the computer-manipulated images, although judgments did vary greatly within the three groups and between the centers. Nonetheless, highly colored teeth were preferred more often by nondental subjects than by dentists or dental technicians. CONCLUSION: Computer-aided image manipulation shows promise as a method for investigating the significance of dental-related beliefs, especially those relating to esthetics, in different population groups. The evaluation of dental appearance and function in this study indicated that dental function is held in greater regard, and that the significance of dental appearance varies widely among dentists, dental technicians, and nondental subjects.

Adolescent↗
PubMedDate not supplied

Effect of water storage on the flexural properties of E-glass and silica fiber acrylic resin composite.

PURPOSE: The aim of this study was to determine the effect of water on the flexural properties of fiber-reinforced denture base polymers. MATERIALS AND METHODS: Continuous woven silanized electrical glass, or E-glass, fibers and woven silica fibers were used to reinforce heat-cured and autopolymerized denture base polymers. Fibers were oriented at a 45-degree angle to the long axis of the test specimens. Control specimens were unreinforced. Dry test specimens and those stored in water for up to 48 weeks were tested with a three-point loading apparatus. The surfaces of the fibers of the test specimens stored dry or 48 weeks in water were analyzed with a scanning electron microscope to evaluate the degree of adhesion between fibers and polymer matrix. RESULTS: The ultimate transverse strength of unreinforced and reinforced denture base polymers decreased during 48 weeks' storage in water (P < 0.05, one-way analysis of variance, n = 5), and most of this reduction occurred during the first 4 weeks of storage in water. The flexural modulus of the unreinforced test specimens decreased significantly (P < 0.001), whereas there was less, if any, change in the flexural modulus of the fiber-reinforced test specimens. Scanning electron microscopic examination revealed no differences in adhesion of E-glass fibers to the polymer matrix when the specimens stored in water were compared with those stored by. Reduced adhesion between the silica fibers and matrix was observed after 48 weeks' storage in water. CONCLUSION: The results of this study suggest that the ultimate transverse strength of the E-glass fiber-reinforced test specimens decreased 14% and that of the silica fiber-reinforced test specimens decreased 36% after 48 weeks of storage in water.

Acrylic Resins↗