Browsing by Author "Sousa, Gerdal"
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- Numerical model of thermal necrosis due a dental drilling processPublication . Fonseca, E.M.M.; Magalhães, Kelly; Fernandes, M.G.A.; Barbosa, Marcos Pinotti; Sousa, GerdalThe main goal of this paper is to present a numerical model for studying the thermal necrosis due a dental drilling process. The finite element method was used with Ansys program for the transient thermal analysis. Also an experimental process is explained to determine the thermal occurrence in a pork mandible. The in-crease of temperature produced during the drilling is compared using the two different methodologies. According the obtained results, the numerical model could be a technique to induce appropriated results with-out using in-vivo models.
- Numerical model of thermal necrosis due a dental drilling processPublication . Fonseca, E.M.M.; Magalhães, Kelly; Fernandes, M.G.A.; Barbosa, Marcos Pinotti; Sousa, Gerdal''The main goal of this paper is to present a numerical model for studying the thermal necrosis due a dental drilling process. When cutting tools, as drills, are used to cut a material, heat is produced and temperature increases of both the tool and material. The drilling parameters (drill speed, drill depth, drill diameter, applied load and feed rate) are important to determine the effect on thermal necrosis. When the irrigation is possible, the effect is decreasing the temperature rise in bone [1]. Bone is a poor conductor of heat, and heat generation is a common problem during any drilling [2]. The value of threshold temperature above which cell necrosis occurs have been presented for different researchers. The literature shows that if the temperature rises above 55ºC for a period of longer than 30s, serious bone damage will be done [2].''
- The assessment of the thermal necrosis due a drilling dental process with or without irrigationPublication . Fonseca, E.M.M.; Magalhães, Kelly; Fernandes, M.G.A.; Sousa, Gerdal; Barbosa, Marcos PinottiMain goal of this work is to present a numerical model to study the thermal necrosis due a dental drilling process, with and without water irrigation. Also an experimental methodology is used to measure the thermal occurrence in a pig mandible.
- The assessment of the thermal necrosis due a drilling dental process with or without irrigationPublication . Fonseca, E.M.M.; Magalhães, Kelly; Fernandes, M.G.A.; Sousa, Gerdal; Barbosa, Marcos PinottiThe main objective of this work is to present a methodology to assess the thermal necrosis in a dental model due a drilling process with and without water irrigation. An experimental methodology, using an infrared thermography camera, was used to measure the rate of temperature change during the drilling in a pig mandible. The finite element method is used with the Ansys program to compare the results with the experimental model. A simplified model was analyzed in a transient thermal process. Using appropriated boundary conditions, successful numerical results could be used as an alternative to the in-vivo models.