Antes de colocar los implantes dentales

Entonces, antes de colocar los implantes dentales es esencial detectar la presencia de enfermedades graves, como procesos degenerativos o cancerosos, trastornos psiquiátricos o alteraciones de carácter psicológico que impidan la colaboración del paciente y el posterior mantenimiento de los resultados.

En esta fase de planificación el dentista también debe saber si el paciente fuma o toma algún medicamento especial. Los malos hábitos de higiene oral y el tabaquismo son obstáculo real para los implantes dentales, puesto que influye de manera totalmente negativa en su mantenimiento a largo plazo.

Los siguientes pasos son la toma de radiografías (que ayuda a detectar patologías como la caries dental o la enfermedad periodontal) y también la toma de impresiones. ¿Para qué sirve este último paso?

Para obtener un modelo de la boca del paciente que incluya todas las características físicas de la misma.
Permite estudiar detenidamente (el dentista puede tomarse el tiempo requerido) la distribución de los dientes restantes en la arcada del paciente, dónde se colocarán los implantes dentales y qué tipo de coronas dentales se van a necesitar.
Confeccionar una férula a medida que actuará de soporte durante la cirugía implantológica.
Facilitar la previsión y la simulación de los resultados deseados.
Finalmente, otra herramienta clave puede ser el escáner de los maxilares, que nos ayudará a determinar definitivamente dónde y cómo insertaremos las piezas de titanio.

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A Simple Introduction to Brushless Micro Motor Control

The brushless micro motor is becoming increasingly popular in sectors such as automotive (particularly electric vehicles (EV)), HVAC, white goods and industrial because it does away with the mechanical commutator used in traditional motors, replacing it with an electronic device that improves the reliability and durability of the unit.

Another advantage of a BLDC motor is that it can be made smaller and lighter than a brush type with the same power output, making the former suitable for applications where space is tight.

The advantages of brushless operation
The brushes of a conventional motor transmit power to the rotor windings which, when energized, turn in a fixed magnetic field. Friction between the stationary brushes and a rotating metal contact on the spinning rotor causes wear. In addition, power can be lost due to poor brush to metal contact and arcing.

Fundamentals of operation
The BLDC motor’s electronic commutator sequentially energizes the stator coils generating a rotating electric field that ‘drags’ the rotor around with it. N “electrical revolutions” equates to one mechanical revolution, where N is the number of magnet pairs.

Controlling a BLDC motor
While BLDC motors are mechanically relatively simple, they do require sophisticated control electronics and regulated power supplies. The designer is faced with the challenge of dealing with a three-phase high-power system that demands precise control to run efficiently.

Driving a BLDC motor
While an 8-bit microcontroller allied to a three-phase inverter is a good start, it is not enough for a complete BLDC motor control system. To complete the job requires a regulated power supply to drive the IGBT or MOSFETs (the “IGBT Driver” shown in Figure 3). Fortunately, the job is made easier because several major semiconductor vendors have specially designed integrated driver chips for the job.

In summary
BLDC motors offer a number of advantages over conventional motors. The removal of brushes from a motor eliminates a mechanical part that otherwise reduces efficiency, wears out, or can fail catastrophically. In addition, the development of powerful rare earth magnets has allowed the production of BLDC motors that can produce the same power as brush type motors while fitting into a smaller space.

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