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Biomedical subjects

B Sundström

Publications and source records attributed to B Sundström.

At least 37 records · Page 2Linked to original sources
PubMed1982

Oral carcinomas associated with snuff dipping. Some clinical and histological characteristics of 23 tumours in Swedish males.

Some clinical and histological characteristics of 23 oral carcinomas in the anterior vestibulum of snuff dipping Swedish males with an average age of 76 years were investigated. Examples of verrucous carcinomas as well as of ordinary, usually verrucoid but also ulcerating, squamous cell carcinomas were encountered. Widespread oral leukoplakia and second primary carcinoma--oral or other--was present in 5 and 6 cases respectively, and occurred together in 3 of these. Eleven cases out of 19 available for additional sectioning and staining showed candidal infection.

Aged↗
PubMed1980

Bone tissue formation within a sintered microporous glass-fiber network implanted in extraction sockets in the rat.

Implants were prepared by sintering glass-fibers into a three-dimensional network with meshes smaller than 20 micron. Oblong 5 x 2 x 0.15 mm sheets of the test material were implanted in maxillary incisor alveoli in eight white rats. The alveoli were closed with a suture in the overlying mucosa. After 3 months the animals were sacrificed and sections from the site of implantation prepared. In three animals only root remnants were found but in the remaining five the implants were wholly or partially embedded in bone tissue. Sections studied with transmitted light, microradiography, and scanning electron microscopy showed that mineralized tissue had also formed within the pores of the network. The intimate contact between the individual fibers and the bone within the network was corroborated through microchemical analysis (EDX).

Alveolar Process↗
PubMed1976

Adenosine triphosphate hydrolysis in rat dental tissues. A histochemical study of ion dependencies.

The effect of EDTA-decalcification, reactivating and activating procedures on the hydrolysis of ATP was studied histochemically in developing dental tissues in the rat. The incubation media contained lead citrate at alkaline pH and lead nitrate at neutral pH, and the results with ATP as substrate were compared with those obtained with beta-glycerophosphate. The ion dependency of ATP hydrolysis could only be ascertained in decalcified sections. As in earlier studies on the hydrolysis of beta-glycerophosphate in dental tissues, this hydrolysis could readily be reactivated through preincubation of the sections in a series of 0.1 M solutions of divalent cations; Zn2+ being the most efficient. This treatment was now found also to give rise to an ATP hydrolysis, which occurred without the need for activating ions in the incubation medium. This ATP hydrolysis should thus be described as nonspecific and, in terms of ion dependency, as due to a metalloenzyme, i.e. alkaline phosphatase. Activating ion dependent ATP hydrolysis in the dental tissues was found in the blood vessels and in the apical part of the secretory ameloblasts. The former was activated by Mg2+, Ca2+ and Mn2+, and the latter by Ca2+ and--almost specifically--by Sr2+. Preincubation with Zn2+ always inhibited the ion dependant ATP hydrolysis in the dental tissues.

Adenosine Triphosphatases↗
PubMed1976

Adenosine triphosphate hydrolysis in rat dental tissues. A histochemical study to differentiate the enzymes involved.

The purpose of this study was to try to differentiate histochemically between the various enzymes which may catalyze the hydrolysis of ATP in developing rat dental tissues. Freeze cut and freeze dried sections of molar and incisor teeth were incubated in lead capture-based media at pH 5.0, 7.2 or 9.4 with one of the following substrates: beta-glycerophosphate, AMP, ADP, ATP, AMP-PNP and tetrasodium pyrophosphate. To establish the enzymatic nature of the hydrolysis parallel sections were incubated after prior fixation in either formaldehyde or glutaraldehyde. By comparing the enzymatic stainings obtained with the various substrates and at the different pH:s, it was concluded that ATP can be visibly hydrolyzed in rat dental tissues by alkaline phosphatase (stratum intermedium, apical part of maturation ameloblasts, basal part of all ameloblasts, odontoblasts and subodontoblastic layer), specific ATPase (apical and basal parts of secretory ameloblasts) and ATP pyrophosphatase and/or adenylate cyclase (stratum intermedium, odontoblasts). Acid phosphatase, specific ADPase, 5'-nucleotidase, inorganic pyrophosphatase, 3':5'-cyclic-AMP-phosphodiesterase and adenylate kinase on the other hand, seem not to be engaged in the ATP hydrolysis to such a degree as to complicate the interpretation of the histochemical staining. The alkaline phosphatase part of the ATP hydrolysis appeared to be rather insensitive to aldehyde fixation, while the hydrolysis effected by specific ATPase and ATP pyrophosphatase and/or adenylate cyclase was extinguished after fixation with formaldehyde for 4 h or glutaraldehyde for 10 min.

Acid Phosphatase↗
PubMed1976

The relation of the clinical picture to the histopathology of snuff dipper"s lesions in a Swedish population.

The relation of the clinical picture of snuff dipper's lesions to the histopathological appearance was studied in 114 male dippers aged 20-88 years. Histological study revealed increased epithelial thickness, a vacuolated surface layer with wavelike, eosinophilic spikes directed toward the surface having a narrow, eosinophilic band as a demarcation toward the prickle cell layer, acanthosis, and a slight inflammatory reaction. Thirteen cases showed an increased number of eosinophilic granulocytes, and nine cases contained amorphous, weakly eosinophilic areas in the connective tissue papillae. No epithelial dysplasia was observed. Increased epithelial thicknees, especially the presence of a vacuolated surface layer, was the only histologic feature that could be correlated with the severity of clinical appearance of the lesions. Deeply located changes, like inflammation and amorphous areas, however, were not reflected in the clinical grading of the lesions.

Adult↗
PubMed1975

Tissue reactions to some dental implant materials. An in vivo study in white rats.

In a 10 week experimental investigation the tissue reactions to implantation of standardised test pieces made of a polysilicone, Silastic, Tantalum, Titanium and a cobalt-chromium alloy, Vitallium, were studied in the white rat. After 2 weeks, polysilicone, Tantalum and Titanium caused slight reactions whilst a comparatively strong round cell infiltration was observed around the cobalt-chromium test pieces. After 10 weeks, no cellular infiltration was demonstrable around any of the implant materials. The now all appeared inert and were surrounded by a tough connective tissue.

Animals↗