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1

Early odontoblastic layer response to cavity preparation and acid etching in rats

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Nemeth L., Erman A., Stiblar-Martincic D.
Folia Biologica
|
2006
|
vol. 54
|
issue 1-2
23-30
EN
The aim of this study was to establish the early odontoblastic layer response and quantitatively to estimate the number of odontoblasts after cavity preparation with and without acid etching. Half of 56 cavities prepared on rats' first upper molars were acid etched. Qualitative and morphometric analyses were made on histological and ultrathin sections 5 min, 6 h, 24 h and 72 h post-operatively. Under the etched cavity, a greater disarrangement of odontoblasts was found, modifications in nuclear shape and condensed chromatin 5 min. post-operatively. An additional reduction of odontoblast number was detected and an increase of aspirated cell number 5 min, 6 h and 24 h post-operatively, pronounced hyperaemia 6, 24 and 72 hours post-operatively and increased odontoblast number 72 hours post-operatively, compared to unetched cavities. In conclusion, injury to the odontoblastic layer was greater, but numerical renewal of the odontoblastic layer began earlier in etched cavities compared to unetched cavities.
2

Astereological analysis of FRTL-5 cells as an effect of thyrotropin and irradiation

100%
Stiblar-Martincic D., Cor A., Pajer Z.
Folia Biologica
|
2002
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vol. 50
|
issue 3-4
173-177
EN
FRTL-5 cell line is a cloned epithelial follicular cell line from Fischer rat thyroids. This cell line expresses many of the thyroid differentiated markers in vitro. Their growth and function depend on thyrotropin (TSH) as the main regulatory hormone. In this astereological analysis, the authors concentrate on FRTL-5 nuclei as the most vulnerable part of the cell. Using morphometrical variables, they wished to discover the morphologically identifiable sign of transformation of FRTL-5 cells after irradiation and to study the effect of different TSH concentrations. FRTL-5 cells were grown in a medium of 4 different concentrations of TSH (0, 0.1, 1, 10 mU/ml) and irradiated with 0 Gy, 2 Gy, and 4 Gy. The results showed that the nuclear-cytoplasmic ratio decreases after irradiation with doses of 4 Gy or if TSH was included in the medium. The nuclear maximum diameter of FRTL-5 cells increased with higher concentrations of TSH more obviously after irradiation with 4 Gy than with 2 Gy. On the basis of astereological analysis, it was concluded that different concentrations of TSH and irradiation exert an effect especially upon FRTL-5 cell nuclei. The possible transformation of FRTL-5 cells after culturing in TSH medium and after irradiation could be confirmed by injection into an animal of the Fischer strain.
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