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[Detoxication of necrotic and infected endodontium by means of Adsorbtion]

Milutin Dobrenić ; Stomatološki fakultet, Zagreb
Zdenko Njemirovskij ; Stomatološki fakultet, Zagreb

Puni tekst: hrvatski pdf 1.803 Kb

str. 203-214

preuzimanja: 375



A dynamic pictures of the process developing in the necrotizing and infected endodontium is presented in the introduction and based on the currently recogrT.izjed facts. The picture is build up on the liberation of the molecular bonds of the proteinic molecules in the pulp and the dentinal canaliculi; through the process of diffusion they may pass into the environment of the tooth. We endeavoured to establish by microchemical investigation the pH values of the disintegrated contents of the dentinal canaliculi and pulp; microtomic specimen and selective staining of 28 extracted teeth were used. The microbiological substrate of disintegrated endodontium was studied in order to establish 'the zones of severe and slight infection in the dentinal canaliculi, and tine correlation between the pH values of the contents of the canaliculi in the radix clentis and the contents of microbic flora. Finally the effect of adsorbents in vitro upon the disintegrated endodontium at different pH walues was applied and analyzed in a series of physico-chemical investigations. The deduction was made on basis of results obtained in these investigations that the canal of the radix dentis, the accessory canaliculi of the dental pulp and the dentinal tubules in necrotized and infected endodontium contain destroyed tissue in which the protine molecule with a pH value below the isoelectric point predominates. The molecular groups of this tissue are suitable for adsorbtion by an appropriate adsorbent. The authors have found furthermore that the canal of the radix dentis and the tubules belonging to it contain an abundant microbic flora in case the endodontium is necrotized and infected. The flora is most plentiful in the canal of the radiix dentis and diminishes towards the periphery of the accessory canaliculi and dentinal tubules. Although adsorbents showed no inhibition of the development of bacterial flora in experimental conditions they are capable of producing inactivation of the bacteria in the canal of the radix dentis through the process of adsorbtion. Among the adsorbents tested under experimental conditions the highest activity was exhibited by oxides of aluminium, calcium, zinc and magnesium. In consideration of the finding of average pH value in the canal of the radix dentis with necrotized and infected dental pulp — the values ranged at a level below 7 — the adsorbent mass which includes MgO in its composition exhibited the best adsorbtion capacity even in conditions when it was supplemented with certain ingredients in order to acquire the appropriate physical properties to ensure easy inrtoduction of the necessary radiographic contrast substance into the canal of the radix dentis. The intensivity of the phenomenon of adsorbtion was seen to be dependent on the time interval of the activity of the adsorbent in the experimentally prepared medium.

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