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: 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.

Introduction: taking fixed partial denture impressions, silicon is better by adding dimension stability and a higher detail reproduction. Trays are required; they may be perforated metal stock or self-curing acrylic. Materials and methods: we performed an experimental, comparative in-vitro study by sampling 10 plaster models got from ten impressions taken using five perforated metal stock trays and five self-curing acrylic trays, all of them made by stainless steel model simulating the lower jaw. Measuring plaster models and the stainless steel model was performed by a single operator through a stereoscope Nikon model CPs 160, Series 1005941. First, we calibrated the stainless steel model by measuring height and diameter of abutment teeth canines 33-43, first molars 36-46, the interpillar distance between 33-43 and 43-46. Then plaster models were measured and results compared using descriptive summary measures and averages based on Mann-Whitney test. Results: none of the measurements taken on models based on both basin types revealed a statistically significant difference p > 0.5. Conclusions: no statistically significant difference by taking impressions with perforated metal stock trays or self-curing acrylic trays.

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.