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- Experimental validation of a computational fluid dynamics model using micro-particle image velocimetry of the irrigation flow in confluent canalsPublication . Pereira, Mário Rito; Silva, Gonçalo; Semião, Viriato; Silvério, Vânia; Martins, Jorge N.R.; Pascoal-Faria, Paula; Alves, Nuno; Dias, Juliana R.; Ginjeira, AntónioAim: This study aimed to experimentally validate a computational fluid dynamics (CFD) model, using micro-particle image velocimetry (micro-PIV) measurements of the irrigation flow velocity field developed in confluent canals during irrigation with a side-vented needle. Methodology: A microchip with confluent canals, manufactured in polydimethylsiloxane was used in a micro-PIV analysis of the irrigation flow using a side-vented needle placed 3 mm from the end of the confluence of the canals. Velocity fields and profiles were recorded for flow rates of 0.017 and 0.1 ml/s and compared with those predicted in CFD numerical simulations (using a finite volume commercial code –FLUENT) for both laminar and turbulent regimes. Results: The overall flow pattern, isovelocity and vector maps as well as velocity profiles showed a close agreement between the micro-PIV experimental and CFD predicted data. No relevant differences were observed between the results obtained with the laminar and turbulent flow models used. Conclusions: Results showed that the laminar CFD modelling is reliable to predict the flow in similar domains.
- International Conference on Quality, Innovation and Sustainability – ICQIS2020 - Book of AbstractsPublication . Pereira, Mário Rito; Simões, Fábio; Carlos Sá, José; Ferreira, Irene; Martinho, PedroThis book gathers the abstracts submitted and presented at the 2nd International Conference on Quality, Innovation and Sustainability, organized by the Polytechnic of Leiria and the Polytechnic Institute of Viana do Castelo on November 19 and 20, 2020. Abstracts are organized by session, and include keynote presentations, ordinary presentations and the poster session.
- Root Canal Anatomy of Maxillary and Mandibular TeethPublication . Versiani, Marco A.; Pereira, Mário Rito; Pécora, Jesus D.; Sousa-Neto, Manoel D.It is a common knowledge that a comprehensive understanding of the complexity of the internal anatomy of teeth is imperative to ensure successful root canal treatment. The significance of canal anatomy has been emphasized by studies demonstrating that variations in canal geometry before cleaning, shaping, and obturation procedures had a greater effect on the outcome than the techniques themselves. In recent years, significant technological advances for imaging teeth, such as CBCT and micro-CT, respectively, have been introduced. Their noninvasive nature allows to perform in vivo anatomical studies using large populations to address the influence of several variables such as ethnicity, aging, gender, and others, on the root canal anatomy, as well as to evaluate, quantitatively and/or qualitatively, specific and fine anatomical features of a tooth group. The purpose of this chapter is to summarize the morphological aspects of the root canal anatomy published in the literature of all groups of teeth and illustrate with three-dimensional images acquired from micro-CT technology.