Search results for "implante"

Perdida ósea margina y supervivencia a cuatro años de implantes osteointegrados colocados en pacientes con síndrome de Down y parálisis cerebral

2017

un estudio retrospectivo de colocación de implantes en síndrome de down paralíticos cerebrales y pacientes sanos y hacer una comparativa entre los grupos y valorar la pérdida ósea marginal y el fracaso implantológico de cada grupo además valorar otras variables según la edad prótesis localización.... RESUMEN INTRODUCCIÓN & OBJETIVOS: Evaluar la tasa de supervivencia de los implantes y la pérdida ósea marginal después de 4 años en pacientes con síndrome de Down y parálisis cerebral, en comparación con un grupo control sin patología. MATERIAL Y MÉTODOS: Casos: 102 implantes en 19 pacientes (71 con parálisis cerebral y 21 con síndrome de Down); controles: 70 implantes en 22 pacientes sanos (si…

Letter: Risk Factors for Wire Fracture or Tethering in Deep Brain Stimulation: A 15-Year Experience

2021

Behavioral and hippocampal evoked responses in an auditory oddball situation when an unconditioned stimulus is paired with deviant tones in the cat: …

1995

Event-related potentials (ERP) in the areas CA1, CA3 and dentate fascia (Df) of the hippocampal formation were recorded during an oddball situation in the cat. A rewarding electrical stimulation of the lateral hypothalamus (US) was paired with deviant tones (2500 Hz) that occurred randomly in a series of the standard tones (2000 Hz) given to the left ear. In addition to developing orienting head movements to the side of the deviant tones, an increase in the amplitude of parallel hippocampal ERPs was observed. Both the behavioral and neural responses appeared not until a 50 ms latency range. Furthermore, time-amplitude characteristics of the ERPs corresponded to time-acceleration characteris…

Análisis del comportamiento mecánico in vitro de prótesis parciales fijas sobre implantes dentales con cuello convergente y conexión interna transmuc…

2022

Objetivos: El propósito de la investigación fue analizar a través de un estudio in vitro el comportamiento mecánico de 4 uniones distintas en la interfase pilar implante sobre prótesis parciales fijas con dos implantes dentales (cuello convergente y conexión interna transmucosa) y un voladizo posterior tras unos test de fatiga mecánica y posterior carga compresiva. Material y método: Se realizó un estudio in vitro con 4 grupos, grupo 1 atornillado directo (AD), grupo 2, atornillado In (AIN), grupo 3 cementado In (CIN) y grupo 4 cementado directo (CD) utilizando 19 muestras por grupo con dos implantes cada uno y sus respectivas prótesis. Tras el diseño en Cad-Cam de las muestras y su posteri…

A simple method for preoperative assessment of the best fitting electrode length in single lead VDD pacing.

1996

For single lead VDD pacing, electrodes with various distances between the lead tip and the floating atrial dipole (AV distance) are available. Using different AV distances allows positioning of the atrial dipole in the mid- to high right atrium, regardless of the size of the right heart. In this position, reliable atrial sensing and rejection of ventricular far-field potentials can be expected. A simple test for the preoperative assessment of the best fitting AV distance in the individual patient was tested. We studied 24 consecutive patients prior to implantation of a VDD pacemaker. With the patient in supine position, a test electrode with an AV distance of 13 cm was taped onto the thorax…

Fracture and fatigue of titanium narrow dental implants: New trends in order to improve the mechanical response

2019

Sixty-four fractured commercially pure titanium (cp-Ti) narrow dental implants (NDIs) with similar macrogeometry and connection designs were studied after different implantation times in humans in order to determine their reliability and to evaluate the causes of the fracture. These NDIs were compared with other similar implants, made with alloyed titanium with 15% Zr and with 12% strained titanium. Original implants were tested under static and fatigue conditions, simulating the tri-axial loads in the mouth by means of a Bionix hydraulic test machine. Fractography was studied using field-emission scanning electron microscopy (FSEM). The results showed that cp-Ti NDI exhibits low strength f…

Jaw osteonecrosis management around a dental implant inserted 2 years before starting treatment with zoledronic acid

2015

Journal Article; Bisphosphonates (BP) are a type of drug known to inhibit bone resorption through complex interventions. Their primary mechanism of action is aimed at the cellular level, inhibiting osteoclast activity and so bone resorption. BPs are widely used, with many patients receiving continuous treatment for years. But it is well known that these drugs can produce osteonecrosis of the jaw (ONJ). Zoledronic acid (ZA) is an intravenous BP used in the treatment and prophylaxis of bone disease in patients with malignant tumors with bone implication. ZA is the most potent BP in clinical development. This report describes the case of a 62-year-old woman with breast cancer antecedents which…

Dipole source analyses of laser evoked potentials obtained from subdural grid recordings from primary somatic sensory cortex

2011

The cortical potentials evoked by cutaneous application of a laser stimulus (laser evoked potentials, LEP) often include potentials in the primary somatic sensory cortex (S1), which may be located within the subdivisions of S1 including Brodmann areas 3A, 3B, 1, and 2. The precise location of the LEP generator may clarify the pattern of activation of human S1 by painful stimuli. We now test the hypothesis that the generators of the LEP are located in human Brodmann area 1 or 3A within S1. Local field potential (LFP) source analysis of the LEP was obtained from subdural grids over sensorimotor cortex in two patients undergoing epilepsy surgery. The relationship of LEP dipoles was compared wi…

Rehabilitación del maxilar superior con atrofia severa horizontal utilizando implantes dentales palatinizados.

2016

Objetivo: Evaluar las condiciones de los tejidos blandos y la pérdida de hueso alrededor de los implantes palatinizados en maxilares con severa atrofia horizontal, rehabilitados con prótesis fija de arco completo y compararlos con los implantes convencionales centrados en la cresta ósea de maxilares no atróficos tras un periodo mínimo de 5 años de seguimiento. Material y método: Se realizó un estudio retrospectivo clínico y controlado sobre pacientes que fueron rehabilitados con prótesis fija de arcada completa sobre implantes dentales en el maxilar y con un seguimiento mínimo de 5 años después de la carga del implante. Los pacientes se dividieron en 2 grupos: pacientes con maxilar clase IV…

Is atrial sensing of ventricular far-field signals important in single-lead VDD pacing?

1998

UNLABELLED In single-lead VDD pacing the atrial sensitivity frequently is programmed to sensitive values. Atrial sensing of ventricular far-field signals should be reduced by differential atrial sensing. The aim of the study was to evaluate the effectiveness of this approach. METHODS The study included 10 patients with a single-lead VDD pacemaker (Thera 8948, Lead 5032). The atrial sensitivity was set to its most sensitive value of 0.18 mV and the telemetered intraatrial EGM was continuously recorded. After atrial tracked ventricular pacing, VVI pacing was performed with pacing rates from 100 to 160 beats/min in steps of 10 beats/min and up to 165 beats/min. The peak-to-peak amplitudes of P…