22 March 2016 Evaluation of Tizian overlays by means of a swept source optical coherence tomography system
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Proceedings Volume 9670, Sixth International Conference on Lasers in Medicine; 96700X (2016) https://doi.org/10.1117/12.2191905
Event: Sixth International Conference on Lasers in Medicine, 2015, Bucharest, Romania
Abstract
The teeth affected by pathologic attrition can be restored by a minimally invasive approach, using Tizian overlays. In this study we prove the advantages of a fast swept source (SS) OCT system in the evaluation of Tizian overlays placed in an environment characterized by high occlusal forces. 12 maxillary first premolars were extracted and prepared for overlays. The Tizian overlays were subjected to 3000 alternating cycles of thermo-cycling (from -10°C to +50°C) and to mechanical occlusal overloads (at 800 N). A fast SS OCT system was used to evaluate the Tizian overlays before and after the mechanical and thermal straining. The SS (Axsun Technologies, Billerica, MA) has a central wavelength of 1060 nm, sweeping range of 106 nm (quoted at 10 dB) and a 100 kHz line rate. The depth resolution of the system, measured experimentally in air was 10 μm. The imaging system used for this study offers high spatial resolutions in both directions, transversal and longitudinal of around 10 μm, a high sensitivity, and it is also able to acquire entire tridimensional (3D)/volume reconstructions as fast as 2.5 s. Once the full dataset was acquired, rendered high resolutions en-face projections could be produced. Using them, the overlay (i.e., cement) abutment tooth interfaces were remarked both on B-scans/two-dimensional (2D) sections and in the 3D reconstructions. Using the system several open interfaces were possible to detect. The fast SS OCT system thus proves useful in the evaluation of zirconia reinforced composite overlays, placed in an environment characterized by high occlusal forces.
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Corina Marcauteanu, Corina Marcauteanu, Cosmin Sinescu, Cosmin Sinescu, Meda Lavinia Negrutiu, Meda Lavinia Negrutiu, Eniko Tunde Stoica, Eniko Tunde Stoica, Florin Topala, Florin Topala, Virgil Florin Duma, Virgil Florin Duma, Adrian Bradu, Adrian Bradu, Adrian Gh. Podoleanu, Adrian Gh. Podoleanu, } "Evaluation of Tizian overlays by means of a swept source optical coherence tomography system ", Proc. SPIE 9670, Sixth International Conference on Lasers in Medicine, 96700X (22 March 2016); doi: 10.1117/12.2191905; https://doi.org/10.1117/12.2191905
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