Introduction: The purpose of this research was to evaluate micromovements at the bone-implant interface using a provisional polyetheretherketone (peek) abutment and a polymethyl methacrylate (pmma) crown subjected to immediate loading, in order to establish whether these micromovements can impair implant osseointegration under normal loads. This evaluation was carried out through the finite element analysis (fem) method.   Methods: A 13 mmL, 3.7 mmD Tapered Screw-Vent® implant (ref. (tsvb10 Zimmer Dental) was modeled with a 3.5 mm platform, a peek abutment, a screw, and a pmma crown of an upper central incisor. A cortical bone and a cancellous bone were modeled using Solid Works 2010 computer-aided design (cad) software (Solid Works Corp., Concord, Massachusetts, United States), and then processed and analyzed by the ansys 14.0 software. Micromovements at the bone-implant interface were evaluated by applying loads obliquely with a force of 200 Newtons on the palatal surface of the upper central incisor.   Results: The cancellous and cortical bones showed micromovements with similar values (31.57 and 32.88 μm, respectively).   Conclusions: The maximum micromovements occurred at the level of the implant neck. However, the high-density bone is prepared to receive implants with immediate loading without jeopardizing the osseointegration process.

Introduction: problem statement: different alternatives as fixed and removable rehabilitation exist. However, there are few studies available that analyze the behavior of these prostheses with control of the biological variables such as bone type, location, and type of implants. The objective of this study was to analyze the biomechanical behavior of two mandibular prosthesis designs supported on four implants and the adjacent biological zones. Materials and methods: two mandibular prosthetic designs were modeled on 4 Zimmer TSV implants (Zimmer Biomet) in a bone with type D2 characteristics (Misch) assuming a 75% osseointegration. The first design was an overdenture (OD) with an internal CrCoreinforcing bar, retained with Locator adjustments (Zest Anchors), the second design was a metal-acrylic hybrid (HP) prosthesis in which instead of using the CAD bar / CAM splinting the implants, an internal reinforcing bar was designed in CrCo, the load applied in each model was 400N distributed throughout the prosthesis. Results: the efforts were concentrated mainly in the crestal portion of the peri-implant bone in both designs, the efforts in the trabecular portion were minimal, in the peri-implant bone the greatest effort was presented in OD 20,643 MPa, in the HP design was 11,823 MPa, the efforts in implants were  67.8 MPa, greater in HP than in OD 52,613 and in the prosthesis the greatest effort was presented in HP; (56,046 MPa compared to 41,518 MPa in OD). Conclusions: the functioning of the designs is not the same and they transmit different stresses, but neither of them compromises the biological or prosthetic structures evaluated.

Introduction: to evaluate the distribution of von Mises stress in implant-supported restorations, with a temporary pillar of Peek and one of titanium, in three stages of healing (zero day, 1.5 months and 3 months). These evaluations were carried out bfem) method.   Methods: A Tapered Screw-Vent® implant (ref .: TSVB10 Zimmer Dental) of 13 mm length by 3.7 mm diameter was modeled with a 3.5 mm platform, a Peek abutment, a titanium abutment, a screw, a crown Pmma of an upper central incisor, a cortical and spongy bone with different densities depending on the stage of healing; the Solid Works 2010 cad Software was used, processed and analyzed through the ansys Software version 14. The von Mises stress distribution was evaluated, applying oblique loads with a magnitude of 200N.   Results: the concentration of stress in the apical spongy bone is 10 times greater on day zero than in the other moments of healing. The models of abutments in peek at the time 1.5 and 3 months showed almost two times greater efforts in the implant than the models in titanium; similar values wer e observed von Mises when comparing the moment 1.5 and 3 months.   Conclusions: on the zero day of healing the greatest amount of effort is concentrated in the apical portion of the cancellous bone, the Peek pillars transmit more effort to the implant screw, the crestal bone formation helps a better distribution of the stress in the system.

Alternative methodology to elaborate geometrical models of dental anatomySe pretende proponer una metodología alternativa para elaborar modelos geométricos de anatomías dentales para estructuras de dientes incisivos y caninos, y crear modelos CAD apropiados para un posterior estudio por método. Se describe la metodología aplicándola a la construcción de un Incisivo maxilar lateral izquierdo, donde posteriormente se analiza, a modo de ejemplo, el comportamiento del elemento creado bajo una carga de 200 N; esta carga genera un desplazamiento de 27 µm y un esfuerzo Von Mises máximo de 92.588 MPa. Alternative methodology to elaborate geometrical models of dental anatomy The aim of this article is to propose an alternative methodology to elaborate geometrical models of dental anatomy for incisors and canines structures, and to create appropriate CAD models for a further numerical method study. The methodology is described applying it to the construction of a maxillary left lateral incisor. Then the crated element is analyzed, as an example, under a load of 200 N. This load generates a displacement of 27 µm and a maximum Von Mises stress of 92.588 MPa. keywords: Dental models, finite element analysis, computer-assisted nuerical analysis. 

Introduction: The purpose of this research was to evaluate the bone microdeformation of bruxism with dental implants by means of the finite element analysis (FEA) method. Materials and methods: One (1) Tapered Screw-Vent® implant (ref. TSVB10 Zimmer Dental): 13mm long x 3.7mm diameter with a 3.5mm platform, a Zirconium abutment, a screw, resin cement as the cementing agent, a monolithic ceramic crown of an upper central incisor, cortical bone and cancellous bone, was modeled using Solid Works 2010 (SolidWorks Corp., Concord, MA, USA), and later it was processed and analyzed with ANSYS version 14. The von Mises stresses and bone microdeformation (microstrain) were evaluated, applying oblique forces with magnitudes of 200N and 800N. This analysis allowed for evaluating and comparing the microdeformation, both in cortical bone and in cancellous bone in two magnitudes 200N and 800N. Results: Each one of the elements of the modeled structure (crown, abutment, screw, implant, cortical and cancellous bone) when subjected to increased stress, presented particular von Mises and microstrain values with a linear behavior. By subjecting the modeled structure to forces of 200N and 800N, none of the components suffered permanent deformation, that is, the yield point was not exceeded. Conclusion: According to the mechanical behavior of the modeled structure in magnitudes of 800N, it is possible to use a dental implant in a maxillary central incisor, since the parafunctional forces generated by bruxism are not higher than those presented in the modeled structure; Consequently, they do not generate permanent bone deformations.