Korean J Oral Maxillofac Radiol.  2002 Mar;32(1):35-39.

The effect of mandibular position and gantry angle on the evaluation of implant site with implant CT

• Lee SM
• An CH
• Choi HM
• Heo MS
• Lee SS
• Choi SC
• Park TW

Abstract

PURPOSE: The altered gantry angle during scanning for some multiplanar reconstruction CT program (CT/MPR) may cause distortion of the image. The aim of this study was to ascertain whether there is a image distortion in a reformatted image when the gantry and the object are equally inclined using ToothPix and DentaScan program.
MATERIALS AND METHODS
A resin block model with four cylindrical holes and a human dry mandible were used. Two MPR software packages, ToothPix and DentaScan program, were used for reformatted panoramic images. The block and the gantry were equally inclined at 0degree, 15degrees, and 30degrees.
RESULTS
With ToothPix program, a resin block model with empty holes and a dry mandible showed inclined images in the reformatted panoramic image. Increasing the gantry angle, the depth and inclination of the holes were increased in the reformatted central panoramic images. However, a resin block model with gutta percha in its holes and a dry mandible with a wire in its mandibular canal didn't show image distortion. With DentaScan program, image distortion was not seen in any situation.
CONCLUSION
ToothPix program may distort the reformatted image when the gantry angle is not at zero degrees. However, with DentaScan program, the patient may be positioned comfortably and the gantry can be adjusted to the patient positioning.

Keyword

image processing; computer-assisted; dental implants

MeSH Terms

Dental Implants
Gutta-Percha
Humans
Mandible
Patient Positioning
Dental Implants
Gutta-Percha