Músculos del piso de boca en TEM vs. IRM / Mouth floor muscles in TEM vs. IRM

El presente artículo de revisión fue realizado para comparar detalles imagenológicos de resonancia magnética y tomografía espiral multicorte de las estructuras anatómicas del piso de boca; esta es una región desafiante de la cavidad oral para el odontólogo ya que se encuentra constituida de tejidos blandos, vasculares, glandulares y nerviosos, a su vez carece de tejidos óseos volviéndola mucho más susceptible a patologías. Por ello la resonancia magnética es el estudio de preferencia para los tejidos blandos pues permite conocer con más facilidad la anatomía y a la tomografía espiral multicorte ideal para el análisis de tejidos duros, sin embargo puede evaluarse el piso de boca sin ser el estudio imagenológico indicado para esta. El presente trabajo es una recopilación de artículos en bases de datos e internet con el fin de comparar detalles imagenológicos entre la resonancia magnética y tomografía espiral multicorte.

This review article was conducted to compare magnetic resonance imaging and multislice spiral tomography of floor of mouth anatomical structures; this is a challenging region of oral cavity for dentist since it is made up of soft, vascular, glandular and nervous tissues, in turn lacks bone tissues, making it much more susceptible to pathologies. Therefore, magnetic resonance is the preference study for soft tissues because it allows knowing more easily anatomy and multislice spiral tomography ideal for hard tissues analysis, however floor of mouth can be evaluated without being the imaging study indicated for is. The present work is a compilation of articles in databases and internet in order to compare both: magnetic resonance and multislice spiral tomography.

Comparación de la posición condilar entre dos técnicas de registro de relación céntrica mediante tomografía espiral / Condylar position comparison between two centric relation recording methods, by means of a spiral tomography technique

Objetivo: El objetivo de este estudio fue comparar la variación de la posición del cóndilo mandibular entre la técnica de registro de relación céntrica auto-inducida de tipo activa y otra de manipulación mandibular de tipo chin-point. Método: En una muestra por conveniencia de 9 sujetos (4 hombres y 5 mujeres), se estudiaron un total de 18 articulaciones témporomandibulares determinando la variación de la posición condilar con el uso de imágenes obtenidas mediante tomografía espiral, utilizando para ambas técnicas un deprogramador anterior de Neff para estandarizar el grosor del material de registro. Resultados: Se observó que con la técnica chin-point, el cóndilo adopta una posición más posterior (55.6 por ciento) y superior (72.2 por ciento) respecto a la auto-inducida de tipo activa, con diferencias estadísticamente significativas (p<0.001, t-test). En promedio se observó que la técnica chin-point produjo una magnitud de desplazamiento de 1.5mm en dirección cefálica y 1.1mm hacia posterior, tomando como referencia la posición registrada con la técnica auto-inducida de tipo activa. Conclusiones: La técnica chin-point produce una posición condilar más posterior y superior que la técnica auto-inducida de tipo activa.

Objective: The aim of this study was to compare the mandibular condylar position between two centric relation recording methods: Active self-induced type and chin-point manipulation. Method: In a convenient sample of 9 subjects (5 females and 4 males), the condylar position variation was determined in the 18 temporomandibular joints by means of a spiral tomography radiographic technique. To standardize the thickness of the registration material, a Neff anterior deprogramming appliance was used. Results: It was observed that with the chin-point technique, the condyle adopted a significantly more superior (72.2 percent) and posterior (55.6 percent) position compared to the active self-induced technique (p<0.001, t-test). Regarding magnitudes, chin-point produced an average of 1.5mm cephalic and 1.1mm posterior displacements, using the position obtained with the active self-induced technique as a reference. Conclusions: Chin-point technique generates a more superior and posterior condylar position that the one determined by the active self-induced.

Multislice Spiral CT MPR and PRR:Clinical Application in Trauma of Orbit / 实用放射学杂志

Objective To evaluate the applied value of multislice spiral CT multiplanar reconstruction in diagnosing the trauma oforbit. Methods 40 patients with trauma of orbit underwent multislice spiral CT scan, the thickness of slices was 2 mm and collimator was 0.75 mm. Multiplanar reconstruction (MPR) and free angle parallel ranges reconstruction (PRR) were performed. CT findings of orbital trauma were analysed. The result passes through the surgery and the clinical confirmation.Results 14 cases with radiopaque foreign in orbit comfirmed by operation were accurately localized by MPR and PRR, but 6 cases were misdiagnosed by conventional CT. There were 21 cases with fracture of orbital wall, of them, 9 cases were not detected or partially misdiagnosed by plain CT. The damage of eye musculus rectus was in 16 cases, 6 cases were diagnosed by MPR+PRR. There were 16 cases with eyeball damage, of them , 4 cases detected by conventional CT difficultly, but they identified by MPR and PRR. The damage of optic nerve was in 5 cases, 4 cases were not discovered by conventional CT. Conclusion MPR and PRR are of important value in evaluating the orbital trauma.