Abstract Objective Microorganisms harboring the oral cavity, mainly those related to periodontal diseases, are most potential etiologic factor of failure in long‐term implant treatment. The material used for abutment components may influence adhesion and colonization microbial species. aim this vivo investigation was evaluate biofilm formation on machined ( MPT ) or cast titanium CPT zirconia abutments (Zc). Methods Six healthy subjects were enrolled randomized crossover clinical...

Several impression materials are available in the Brazilian marketplace to be used oral rehabilitation. The aim of this study was compare accuracy different for fixed partial dentures following manufacturers' instructions. A master model representing a partially edentulous mandibular right hemi-arch segment whose teeth were prepared receive full crowns used. Custom trays with auto-polymerizing acrylic resin and impressions performed dental surveyor, standardizing path insertion removal tray....

This study investigated whether there is a direct correlation between the level of vertical misfit at abutment/implant interface and torque losses (detorque) in abutment screws. A work model was obtained from metal matrix with five 3.75 x 9 mm external hex implants standard platform (4.1 mm). Four frameworks were waxed using UCLA type abutments one-piece cast commercially pure titanium. The analyzed comparator microscope after 20 Ncm torque. highest value observed per used. required to loose...

Internal tapered connections were developed to improve biomechanical properties and reduce mechanical problems found in other implant connection systems. The purpose of this study was evaluate the effects loading repeated insertion/removal cycles on torque loss abutments with internal connections.Sixty-eight conical implants 68 two types used. They divided into four groups: groups 1 3 received solid abutments, 2 4 two-piece abutments. In 2, simply installed uninstalled; torque-in torque-out...

The aim of this study was to determine the effect oral environment on corrosion dental alloys with different compositions, using electrochemical methods. rates were obtained from current-potential curves and impedance spectroscopy (EIS). artificial saliva dependent alloy composition. Dissolution ions occurred in all tested results strongly general Regarding containing nickel, Ni-Cr Ni-Cr-Ti released 0.62 mg/L Ni average, while Co-Cr between 0.01 0.03 Co Cr, respectively.The open-circuit...

This study compared splinted and non-splinted implant-supported prosthesis with without a distal proximal contact using digital image correlation method. An epoxy resin model was made acrylic replicas of mandibular first premolar second molar threaded implants replacing the molar. Splinted metal–ceramic screw-retained crowns were fabricated loaded presence A single-camera measuring system used to record in-plane deformation on surface at frequency 1.0 Hz under load from 0 250 N. The images...

This study compared the loosening torque of experimental conical-head abutment screws to that conventional flat-head implants with external-hex (EH) and internal tri-channel (IT) connections before after mechanical loading.Forty-four implant/screw/abutment assemblies were divided into four groups: EH/flat-head screw (EH), IT/flat-head (IT), EH/conical-head (EHCS), IT/conical-head (ITCS). Three from each group analyzed in a stereoscopic magnifier then returned their respective groups. One...

We consider a three-dimensional model of spinor fields with Thirring-like, quadrilinear self-interaction. Using either two- or four-component Dirac spinors, we prove that the $\frac{1}{N}$ expansion for is renormalizable if gauge structure to select physical quantities introduced. For certain values coupling, leading approximation exhibits bound-state poles. Dynamical breaking parity chiral symmetry shown occur as cooperative effect different orders $\frac{1}{N}$, $N$ smaller than critical...

This study compared vertical and passive fit of one-piece cast frameworks made with 3 different materials: commercially pure titanium (CP Ti - G1), cobalt-chromium alloy (Co-Cr G2) nickel-chromium-titanium (Ni-Cr-Ti G3). Fifteen were obtained simulating bars for fixed prosthesis in a model 5 implants. The the framework interface was measured using an optical microscope at ×30 magnification. Data statistically analyzed by ANOVA LSD tests (α=0.05). Mean standard deviation values were,...

Abstract Objectives: The aim of this study was to evaluate the variation in removal torque implant prosthetic abutment screws after successive tightening and loosening cycles, addition evaluating influence hexagon at base on screw torque. Material methods: Twenty hexagonal abutments were tightened 20 regular external hex implants with a titanium alloy screw, an insertion 32 N cm, measured digital gauge. implant/abutment/screw assemblies divided into two groups: (1) without (2) base. Each...

This study evaluated the loss of torque applied after use new screws and successive tightening. Four infrastructures (IE), using UCLA castable abutment type, were cast in cobalt-chromium alloy (G1) used a first moment. Subsequently, same second time (G2) more than two times (G3). The values torques detorques measured with digital wrench to obtain initial tightening (%). Data analyzed by ANOVA Tukey's test (?=0.05). Significant differences observed between G1 (50.71% ± 11.36) G2 (24.01% 3.33)...