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Mineralization of teeth and bones of the cave bear (Ursus spelaeus) from the Biśnik Cave, Southern Poland

100%

Rogóż A. , Sawłowicz Z. , Socha P. , Stefaniak K.

tom Vol. 40, iss. 1/4

65--84

The studied bones and teeth of the cave bear (Ursus spelaeus) come from the Biśnik Cave, located in the Częstochowa Upland (Southern Poland). The specimens originate from different geological layers formed since the Odra Glaciation (250–270 thousand years BP). The fossilized bones and teeth were studied using optical microscopy, scanning electron microscopy, X-ray diffraction, FTIR spectroscopy, and INAA. They are built of recrystallized carbonate-rich apatite-(CaOH) and/or apatite-(CaOH). The teeth additionally contain some apatite-(CaF). The lack of collagen and minor REE contents suggest rapid burial and collagen decay in the early stage of diagenesis. The bones and teeth have only limited mineral infillings. In some teeth, Mn-Fe (hydroxy)oxides were found in the dentine canaliculi and in bones, some osteocyte lacunae contain Fe (hydroxy)oxides with admixture of Mn. In one bone specimen, calcite infillings are present in Haversian canals. The infillings formed during later stages of diagenesis and were succeeded by non-filled cracks.

Zonula adherens as a transmitter of low charge electric current

100%

Alwas-Danowska H. M.

nr Suppl.

Dentinogenesis imperfecta type II: Ultrastructure of teeth in sagittal sections

84%

Wieczorek A. , Loster J.

nr 3

Numerical and experimental analysis of effort of human tooth hard tissues in terms of proper occlusal loadings

84%

Milewski G.

2005

tom Vol. 7, nr 1

47-58

The paper presents the results of strain gauge experiments conducted in order to determine the strain and stress distributions in all groups of human tooth crowns in terms of the proper occlusal loadings. The features simulating masticatory loadings have not been considered. The results have been compared with the numerical solutions obtained by rneans of finite element method (FEM). A good agreement between the results of both experiments has been reached. On that basis the analysis of effort distributions in enamel and dentine as well as comparison of application of strength hypotheses to hard tissues of tooth were made.