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Effect of pulp chamber filling with glass ionomer cement in endodontically treated teeth rehabilitated with endocrowns: in vitro and MEF-3D analysis

Grant number: 16/25311-7
Support type:Regular Research Grants
Duration: April 01, 2017 - September 30, 2019
Field of knowledge:Health Sciences - Dentistry - Dental Clinics
Principal researcher:Erica Alves Gomes
Grantee:Erica Alves Gomes
Home Institution: Universidade de Ribeirão Preto (UNAERP). Campus Ribeirão Preto. Ribeirão Preto , SP, Brazil
Assoc. researchers:Izabela Cristina Mauricio Moris Rivera ; Ricardo Faria Ribeiro


Endodontically treated teeth present a high risk of biomechanical failure due to significant loss of tooth structure. The aim of this study was to evaluate the mechanical behavior of endodontically treated teeth restored with endocrowns by different ceramic systems using the CAD/CAM system through in vitro analysis and the three-dimensional finite element method (MEF-3D). For the in vitro analysis, 84 lower human molars will be endodontically treated and will be performed standardized preparations in the occlusal region with 5 mm deep, 6 mm long (mesio-distal direction) and 4 mm wide (vestibular-lingual direction). The teeth will be randomly divided into 4 groups (n = 21), according to the different ceramic systems used to make the endocrowns: G1- feldspathic ceramics; G2- lithium disilicate; G3- lithium silicate reinforced with zirconia; G4- monolithic zirconia. After adhesive cementation, the samples will be submitted to static test of fracture resistance in a universal test machine with load cell of 500 kgf and speed of 1 mm / min, in order to determine the profiles of progressive accelerated fatigue (light, moderate and severe), which will be performed with the frequency of 5 Hz and temperature variation between 5 ° C - 55 ° C. The data collected will be submitted to statistical analysis by means of appropriate tests for the study. For analysis by the MEF-3D, an in vitro sample described above will be scanned by computerized microtomography. Next, bioCAD models will be compiled and divided into 4 groups (G1, G2, G3, and G4) as previously described for in vitro analysis. The mechanical properties (modulus of elasticity and Poisson's coefficient) of the ceramic materials used in this study will be determined non-destructively by the impulse excitation technique. Load will be applied to the occlusal surface of the tooth, axially to its long axis. The models will be supported by the periodontal ligament and osseous tissue that will be fixed in the 3 axes of the cartesian plane (x = y = z = 0). Equivalent von Mises tensions (MPa) and maximum principal stress (MPa) will be obtained. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
POOLE, STEPHANIE FRANCOI; PEREIRA, GABRIEL KALIL ROCHA; MORIS, IZABELA C. M.; MARQUES, ARTUR GAIOTO; RIBEIRO, RICARDO FARIA; GOMES, ERICA A. Physical properties of conventional and monolithic yttria-zirconia materials after low-temperature degradation. CERAMICS INTERNATIONAL, v. 45, n. 16, p. 21038-21043, NOV 2019. Web of Science Citations: 0.

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