Tomographic distortion in toothless patients.
The main aim of this work is to compare the measurements of paraxial slices of the standard Denta-Scan technique and a new technique (Occlusal technique) in toothless patients. On a more specific level, our goal is to assess the effect of a change in the reference plane of computer axial tomography (CAT), for which the Denta-Scan system is usually employed, by transferring the palate plane to the prosthetic plane, which goes from the center of the external auditory canal to the anterior nasal spine. For the experiment, 15 maxillaries were used from toothless skulls belonging to adult patients who had lost their teeth prior to their death. For each one, a wax rim was made in reference to the Occlusal Plane (Camper's Prosthetic Plane) and a 10 mmx 3.3 mm reference implant was placed. Two tomography scans were made of each skull; one using the conventional technique, and the other using Camper's Prosthetic Plane. The tomograph used was of the helicoid type (Phillips MX8000), with 1.3 mm slices every 0.6 mm. To perform the comparative measurements between the two techniques, a VIS Caliper (Poland), was employed, and the data recorded in a table with the reference of each sample and technique. This was repeated with all 15 skulls. The results obtained were evaluated with the measurement of the reference implant for each technique. It was found that the standard technique (Horizontal Plane) showed 19.20% magnification, as opposed to the technique under examination (Camper's Occlusal Plane), which showed 16.5% magnification. The study showed distortions in each measurement as regards the real measurements of the reference implants. These distortions were less significant in the case of the Occlusal Plane technique than in the Horizontal Technique; however neither of them fully matched the measurements of the reference implant.
School of Dentistry, La Plata National University, Argentina. masterdocdario@gmail.com
Darío
D
Cucchiarelli
Alicia
A
Kitrilakis
Ernesto
E
Pastori
D000328:Adult; D016477:Artifacts; D002102:Cadaver; D003766:Dental Occlusion; D003824:Denture, Complete; D006801:Humans; D008437:Maxilla / Q000000981:diagnostic imaging; D009066:Mouth, Edentulous / Q000000981:diagnostic imaging*; D021362:Palate, Hard / Q000000981:diagnostic imaging; D011858:Radiographic Magnification; D014057:Tomography, X-Ray Computed / Q000295:instrumentation / Q000379:methods