The commonly used methods for evaluating the endodontic apical seal, such as longitudinal and transversal section and diaphanization, show some operative difficulties and intrinsic limitation. This study suggests and describes a new method of analysis using a synchrotron radiation microtomography to analyse the root apex after post insertion, creating a three-dimensional image and analysing sections of the specimen every 5 pm. The study was performed at SYRMEP beam line at the Electra Synchrotron in Trieste using monochromatic X-rays of 32 KeV. Eleven monoradicular teeth were prepared using NiTi GT Rotary files instruments to an apical size 20 with conicity .06 and divided in four groups: in G1 (n = 4) and G2 (n = 2), the specimens were endodontically filled with guttapercha and a zinc-oxide sealer, in G3 (n = 3) and G4 (n = 2) guttapercha and a silicon-based sealer were used. An endodontic post was inserted in specimens of groups 1 and 3 following the manufacturer's instructions. Specimens were analysed using monochromatic X-rays of 32 KeV. A CCD detector with pixel dimension pf 5 x 5 mu m(2) was used for the acquisition process. Seven hundred and twenty projections were performed over 180 degrees range using a high-resolution rotator. The projections were reconstructed using standard algorithms for tomographic reconstruction. The apical infiltration was evaluated by verifying if black spots were detectable on the images-The specimens of groups 3 and 4 showed a better apical seal than the ones of groups 1 and 2. Post insertion, When a KOE-based sealer is used, increases the apical gap even if it does not seem to be clinically relevant and sufficient to be a cause of endodontic failure. The new method for analysis appeared to be effective to detect small defects in endodontic obturation, analysing guttapercha-sealer and sealer-dentin interfaces.
Titolo: | Evaluation of the Endodontic Apical Seal after Post Insertion by Synchrotron Radiation Microtomography |
Autori: | |
Data di pubblicazione: | 2005 |
Rivista: | |
Abstract: | The commonly used methods for evaluating the endodontic apical seal, such as longitudinal and transversal section and diaphanization, show some operative difficulties and intrinsic limitation. This study suggests and describes a new method of analysis using a synchrotron radiation microtomography to analyse the root apex after post insertion, creating a three-dimensional image and analysing sections of the specimen every 5 pm. The study was performed at SYRMEP beam line at the Electra Synchrotron in Trieste using monochromatic X-rays of 32 KeV. Eleven monoradicular teeth were prepared using NiTi GT Rotary files instruments to an apical size 20 with conicity .06 and divided in four groups: in G1 (n = 4) and G2 (n = 2), the specimens were endodontically filled with guttapercha and a zinc-oxide sealer, in G3 (n = 3) and G4 (n = 2) guttapercha and a silicon-based sealer were used. An endodontic post was inserted in specimens of groups 1 and 3 following the manufacturer's instructions. Specimens were analysed using monochromatic X-rays of 32 KeV. A CCD detector with pixel dimension pf 5 x 5 mu m(2) was used for the acquisition process. Seven hundred and twenty projections were performed over 180 degrees range using a high-resolution rotator. The projections were reconstructed using standard algorithms for tomographic reconstruction. The apical infiltration was evaluated by verifying if black spots were detectable on the images-The specimens of groups 3 and 4 showed a better apical seal than the ones of groups 1 and 2. Post insertion, When a KOE-based sealer is used, increases the apical gap even if it does not seem to be clinically relevant and sufficient to be a cause of endodontic failure. The new method for analysis appeared to be effective to detect small defects in endodontic obturation, analysing guttapercha-sealer and sealer-dentin interfaces. |
Handle: | http://hdl.handle.net/11368/1691905 |
URL: | http://apps.webofknowledge.com.px.units.it/full_record.do?product=WOS&search_mode=GeneralSearch&qid=9&SID=P1G5K59FvWdDFa86ciO&page=1&doc=1 |
Appare nelle tipologie: | 4.1 Contributo in Atti Convegno (Proceeding) |