A study of the porosity of some samples of dentinal substitute material from extracted human teeth

摘要

The aim of the present study was to investigate the level of which the endodontic pathology and/ orthe preparation and application procedures of dentinal substitute influenced the quality of the restorativematerial (Biodentine, Septodont, France). It is well known the fact that Biodentine, Septodont offers abioactive substitute to dentine, it is highly biocompatible, presenting a short setting time of approximately10 minutes, which is beneficial in endodontic procedures. Nevertheless, at the same time, it is highlydependent on the conditions under which it is mixed and applied on the dentinal surface and also on thevarious endodontical clinical pathology, thus eventually becoming a potential issue regarding the qualityof the restorative dentinal substitute. In the current study we analyzed microscopically the incidence ofpores and cracks and we estimated the total porosity values of four samples of Biodentine, Septodont thatwere separated from extracted teeth with different endodontic pathology (iatrogenic furcation perforation,internal resorbtion with perforation, external radicular resorbtion and deep coronal lesion restored bysandwich technique). We analyzed two fragments from each sample, out of which two thin sections werecut and from the obtained areas we estimated the total porosity value for each Biodentine sample, using aLeica DM EP polarizing microscope (Switzerland).Locally, in the mass of samples 1 and 3, microcracksand intercommunications between them and certain pores were detected. After the microscopicexamination of pores and estimation of total porosity for all four samples of Biodentine separated fromextracted teeth, very low incidence of pores and no microcracks were identified in sample number 4,probably due to judicious preparation and applying of the material, under the presumptions of the factthat the instructions of setting and preparation were in accordance to the manufacture and the applicationin the dental cavity was done under no humidity conditions. This fact is consistent with other authors'findings. In sample 2 and 4 there were no cracks identified, whereas the incidence of pores in samplenumber 1, 2 was lower and comparable, while in sample number 3 was higher. A possible explanation forthis fact would be a vicious procedure regarding the preparation and application methods under theconditions of a higher local humidity potential.