The Influence of Post System Design and Material on the Biomechanical Behavior of Teeth with Little Remaining Coronal Structure.

Autor: Pinto CL; Department of Prosthodontics, School of Dentistry, Meridional Faculty - IMED, Passo Fundo, Brazil., Bhering CLB; Department of Prosthodontics and Periodontology, Piracicaba Dental School, State University of Campinas - FOP/UNICAMP, Piracicaba, Brazil., de Oliveira GR; Department of Prosthodontics, School of Dentistry, Meridional Faculty - IMED, Passo Fundo, Brazil., Maroli A; Department of Prosthodontics, School of Dentistry, Meridional Faculty - IMED, Passo Fundo, Brazil., Reginato VF; Department of Prosthodontics, School of Dentistry, Meridional Faculty - IMED, Passo Fundo, Brazil.; Department of Prosthodontics and Periodontology, Piracicaba Dental School, State University of Campinas - FOP/UNICAMP, Piracicaba, Brazil., Caldas RA; Department of Prosthodontics and Periodontology, Piracicaba Dental School, State University of Campinas - FOP/UNICAMP, Piracicaba, Brazil., Bacchi A; Department of Prosthodontics, School of Dentistry, Meridional Faculty - IMED, Passo Fundo, Brazil.
Jazyk: angličtina
Zdroj: Journal of prosthodontics : official journal of the American College of Prosthodontists [J Prosthodont] 2019 Jan; Vol. 28 (1), pp. e350-e356. Date of Electronic Publication: 2018 May 14.
DOI: 10.1111/jopr.12804
Abstrakt: Purpose: To evaluate the influence of different post systems on the biomechanical behavior of teeth with a severe loss of remaining coronal structure.
Materials and Methods: Fifty standardized bovine teeth (n = 10 per group) were restored with: cast post-and-core (CPC), prefabricated metallic post (PFM), parallel glass-fiber post (P-FP), conical glass-fiber post (C-FP), or composite core (no post, CC). The survival rate during thermomechanical challenging (TC), the fracture strength (FS), and failure patterns (FP) were evaluated. Finite element models evaluated the stress distribution after the application of 100 N.
Results: All specimens survived TC. Similar FS was observed among post-containing groups. Groups P-FP and CC presented 100% repairable fractures. The von Mises analysis showed the maximum stresses into the root canal in groups restored with metallic posts. Glass-fiber posts and CC presented the maximum stresses at the load contact point. Glass-fiber groups showed lower stresses in the analysis of maximal contact pressure; CPC led to the highest values of contact pressure. The modified von Mises (mvM) stress in dentin did not show differences among groups. Moreover, mvM values did not reach the dentin fracture limit for any group.
Conclusions: The type of intracanal post had a relevant influence on the biomechanical behavior of teeth with little remaining coronal structure.
(© 2018 by the American College of Prosthodontists.)
Databáze: MEDLINE
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