Distorsión en tomografía Denta-Scan

Abstract

Uno de los métodos de diagnóstico por imágenes que se considera en implantología es la tomografía axial computada. Esta técnica es considerada como la más confiable hasta ahora, ya que sería la que reproduce la imagen del hueso en una relación de 1 : 1. Este estudio valora la precisión de la Tomografía Axial Computada por Sistema Denta-Scan de acuerdo al patrón de referencia utilizado para dicho estudio en la programación de la computadora del tomógrafo. Se utilizaron cráneos desdentados, a los cuales se les confeccionaron rodetes de dimensión vertical y se les colocaron testigos de una medida conocida .Se comparó, la técnica convencional de tomografía con otra técnica en la cual se incorporaba la modificación del plano de referencia original del estudio, de acuerdo al que se utiliza en un acto quirúrgico, que es el plano oclusal. Los valores obtenidos demuestran que la técnica modificada es más representativa para el plano utilizado en la cirugía dentomaxilar.

One of the methods of image diagnosis in implantology is the computed axial tomography, the reference plane used to carry out the study is the Horizontal Plane that is taken parallel to the roof of the palatine vault. Instead, the surgical reference is the Oclusal Plane (Prothetic Cámper Plane). Then, if we changed the reference used in the tomography, to the Occlusion P lane, we could have a realer image of the bone. To carry out the experience, 15 maxillary superior toothless sku lls were selected, those had belonged to mature people that had lost their jag pieces prior to their decease. To each one of them, they were made a wax bun, with the Plane Oclusal reference (Cámper Prothetic Plane), and they were placed a witness implants of 10 mm x 3.3 mm. T o each skull they were taken two tomography, one with the conventional technique and another using the Cámper Prothetic Plane. The tomography used was the helical type, Philips trademark MX8000 with courts of 1.3 mm each 0.6mm. To be able to carry out the comparative measurement between one and another technique, it was used a caliper trademark VIS (made in Poland). The results obtained with each technique and each samples were evaluated. One could observe that speaking in percentage, the standard technique (Horizontal) showed a magnification of 19.20% with regard to the technique in study (Oclusal), that showed a 16.5% magnification. The study showed distortions with regard to the real measures of the witness. These distortions were minimized for the case of the Oclusal Technique but none of them gave with the absolute representative of the patron measure.