Biomedical subjects
R J Radlanski
Publications and source records attributed to R J Radlanski.
[Occlusal morphology. Comparison of the contours of incisors and molars].
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[Dimensional behavior of enamel prisms in various depths and regions of the enamel of human permanent teeth].
Different regions of broken enamel of human permanent teeth are observed by means of a scanning electron microscope. The diameter of the prisms must be considered as constant from the dentino-enamel junction up to the enamel surface.
[3-D reconstruction of a tooth germ with hereditary opalescent dentine].
A computer-aided three-dimensional reconstruction of a tooth-germ with hereditary opalescent dentine for the first time permitted to delineate the characteristic large dentinal canals as being of canal-like shape and to show their spatial relationship to the dentinal contour. The tubules often displayed links to pulpal tissue and extended from pulpo-dentinal junction up to the outer layer of dentine. The results of this study support the hypothesis of a vasal origin of these tubules.
3D-computed tomography: a new method for the evaluation of fetal cranial morphology.
This study is the first presentation of three-dimensional computed tomography (3D-CT) for the in vitro evaluation of the prenatal human cranium. The study was based on CT examinations from 26 aborted normal fetuses between 10 and 25 weeks gestational age. Incremental coronal and transverse CT slices of 1 mm thickness and a threshold segmentation algorithm were used to generate 3D-CT reconstructions (surface-shaded display, SSD) of the cranial bones similar to their anatomical appearance. The threshold of the segmentation algorithm was selected after comparison of the 3D-CT images generated with varying thresholds and graphically reconstructed histological serial sections of particular sutures in five specimens. The variation of the segmentation threshold resulted in alterations of the bone sizes and suture widths. However, 3D-CT images allowed sensitive identification of the cranial ossification centers and accurate evaluation of the bone topography. Cutting and rotating procedures made it possible to evaluate all imaged bones in arbitrary views without disturbing superpositions, thus making isolated examinations of particular macroscopic sections of the specimens unnecessary. In conclusion, 3D-CT of the fetal cranium promises to be of considerable help in the evaluation of prenatal cranial development.
Comparative anatomy of teeth from past to present.
The comparative anatomy of teeth has a long tradition in research, starting more than two thousand years ago in antiquity. In the 19th century, Richard Owen's oeuvre Odontography (1840-45) contributed much to establish odontology as an independent scientific discipline. After a short outline of the historical development of the comparative anatomy of teeth, we describe the contents and importance of Owen's Odontography. Finally, we sketch the contemporary situation of dental morphology, which in the course of the last thirty years has developed into an important and internationally highly recognized multidisciplinary field.