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Conference 13006 > Paper 13006-112
Paper 13006-112

OCT-based beneath-the-surface investigations in ceramics sintering: modeling for the most relevant characteristic parameter

10 April 2024 • 15:50 - 16:10 CEST | Londres 1/Salon 8, Niveau/Level 0

Abstract

We present a investigations of dental ceramics using in-house developed swept source (SS) optical coherence tomography (OCT) systems. The issue is related to the loss of calibration of ovens utilized for the fabrication of dental crowns. In the first study [http://dx.doi.org/10.3390/app7060552], metal-ceramics crowns were manufactured, in five study groups, with five maximum sintering temperatures: a normal one, two lower levels and two upper levels (up to +50ºC with regard to normal). OCT B- and C-scans were obtained, and qualitative rules-of-thumb were extracted to assess the oven temperature level by observing ceramic grains bellow the level of the tooth-shaped crowns. The second study [https://doi.org/10.3390/ma12060947] moved to a quantitative assessment of the calibration loss of the ovens. A second type of material (for all-ceramic crowns) was considered, and three levels of its specific temperature were tested. For both ceramics reflectivity curves were obtained from OCT C-scans. These analyses demonstrated that there is (only) one parameter consistent with the shift of the maximum temperature in the oven: the ratio of the maximum and minimum (filtered) reflectivity.

Presenter

Univ. "Aurel Vlaicu" din Arad (Romania)
Virgil-Florin Duma is Prof. at the Polytechnic Univ. of Timisoara (UPT). He proposed in 2008 the 3OM field (in Opto-Mechatronics, Opto-Mechanics and Opt. Metrology) and founded the 3OM Group. He received his PhD cum laude from UPT in 2001, where he graduated valedictorian in Fine Mech.&Opt. in 1991. He was awarded in 2009-2010 a Fulbright Senior Res. Fellowship at The Inst. of Opt., UoRochester, NY, USA, where he is Visiting Res. He is Honorary Prof. at the UoKent, UK. He is author of >60 papers in WOS journals (with a total IF>135), >130 conference papers in WOS, 15 books, and 2 patents awarded (https://www.researchgate.net/profile/Virgil-Florin-Duma). Prof. Duma delivered >50 invited lectures at int’l univ. & conferences. He is reviewer for >40 WOS journals and chair of SPIE-affiliated conferences, including Advances in 3OM. His interests are in opto-mechatronics, measuring systems and imaging techniques. Prof. Duma is member of OSA, SM of SPIE, and life member of the Fulbright Assoc
Application tracks: EU-funded Research
Presenter/Author
Univ. "Aurel Vlaicu" din Arad (Romania)
Author
Univ. de Medicina si Farmacie "Victor Babes" din Timisoara (Romania)
Author
Univ. of Kent (United Kingdom)
Author
Univ. of Kent (Romania)