title: Effect of fibre posts, bone losses and fibre content on the biomechanical behaviour of endodontically treated teeth: 3D-finite element analysis.
abstract: The aim of this work was to evaluate the stress distribution inside endodontically treated teeth restored with different posts (glass fibre, carbon fibre and steel posts) under different loading conditions by using a 3D-finite element analysis. The effect of masticatory and impact forces on teeth with different degrees of bone loss was analysed. The model consists of: dentine, post, cement, gutta-percha, core and crown. Four simulations were conducted with two static forces (170N horizontal and 100N oblique) and two sections constrained: 1mm (alveolar bone position in a normal periodontium) and 6mm (middle of root) below the crown. Von Mises and the principal stresses were evaluated and analysed with a 3-way ANOVA and Tukey test (α=0.05) and the effect of fibre percentage analysed. Significant differences were found among the stress values for all conditions (p<0.05). Impact load was always responsible for the most critical situation especially when the bone loss was more evident. The system with steel posts showed the highest principal stresses at the post-cement interface with horizontal load and top constraints (compressive stress of 121MPa and tensile stress of 115MPa). The use of glass posts provides a more homogeneous behaviour of the system with lower stresses. Higher fibre percentages gave higher stress in the posts. Moreover, larger bone losses are responsible for important increase in stress. Thus, this work demonstrated that periodontal disease has an important role in the success of tooth restoration after endodontic therapy, influencing the choice of post material and depth.
authors.affiliation: University of Perugia, Civil and Environmental Engineering Department, UdR INSTM, Strada di Pentima, 4, - 05100 Terni, Italy. Electronic address: manila.chieruzzi@unipg.it.
authors.forename: Manila
authors.initials: M
authors.lastname: Chieruzzi
authors.affiliation: University of Perugia, School of Medicine, Department of Biomedical and Surgical Sciences, Odontostomatological University Centre, S. Andrea delle Fratte, 06156 Perugia, Italy. Electronic address: stefano.pagano@unipg.it.
authors.forename: Stefano
authors.initials: S
authors.lastname: Pagano
authors.affiliation: University of Perugia, School of Medicine, Department of Biomedical and Surgical Sciences, Odontostomatological University Centre, S. Andrea delle Fratte, 06156 Perugia, Italy. Electronic address: stefano.cianetti@unipg.it.
authors.forename: Stefano
authors.initials: S
authors.lastname: Cianetti
authors.affiliation: University of Perugia, School of Medicine, Department of Biomedical and Surgical Sciences, Odontostomatological University Centre, S. Andrea delle Fratte, 06156 Perugia, Italy. Electronic address: guido.lombardo@unipg.it.
authors.forename: Guido
authors.initials: G
authors.lastname: Lombardo
authors.affiliation: University of Perugia, Civil and Environmental Engineering Department, UdR INSTM, Strada di Pentima, 4, - 05100 Terni, Italy. Electronic address: jose.kenny@unipg.it.
authors.forename: José M
authors.initials: JM
authors.lastname: Kenny
authors.affiliation: University of Perugia, Civil and Environmental Engineering Department, UdR INSTM, Strada di Pentima, 4, - 05100 Terni, Italy. Electronic address: luigi.torre@unipg.it.
authors.forename: Luigi
authors.initials: L
authors.lastname: Torre
mesh_terms: D019245:Compressive Strength; D003738:Dental Cements / Q000737:chemistry; D003764:Dental Materials / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry; D055119:Elastic Modulus; D020342:Finite Element Analysis; D013718:Tensile Strength
chemical_list: D003738:Dental Cements; D003764:Dental Materials; D003776:Dental Porcelain
keywords: Biomechanical behaviour; Bone loss; Composite posts; Dental materials; Dental restoration; Endodontic fibre posts; Finite element analysis