Contardo, L; De Luca, M; Biasotto, M; Longo, R; Olivo, A; Pani, S; Di Lenarda, R; (2005) Evaluation of the endodontic apical seal after post insertion by synchrotron radiation microtomography. In: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT. (pp. 253 - 256). ELSEVIER SCIENCE BV: AMSTERDAM, NETHERLANDS.
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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.
|Title:||Evaluation of the endodontic apical seal after post insertion by synchrotron radiation microtomography|
|Event:||4th Workshop on Medical Applications of Synchrotron Radiation (MARS2004)|
|Dates:||2004-09-23 - 2004-09-25|
|Keywords:||TOMOGRAPHY, LEAKAGE, CANALS|
|UCL classification:||UCL > School of BEAMS > Faculty of Engineering Science > Medical Physics and Bioengineering|
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