Radiographic Custom Shield
Radiographs are an important part of root canal therapy , especially for diagnosis, treatment, and follow-up during the years.
A significant limitation of endodontic radiography is the superimposition of overlying structures, which can hide the object of interest. Eventually it results in collapsing 3-D elements onto a 2-D image, which leads to loss of many informations in the third dimension.
Periodical X rays are useful for endodontic treatment for pre-treatment evaluation of roots and root canal morphology, curvatures, periapical lesions, calcifications,working length determination, quality and extent of root canal obturation and monitoring healing after treatment. For this purpose, a special technique of periapical radiography called as paralleling or long cone technique was developed. The film is placed parallel to the long axis of the tooth to be radiographed and the central beam of X-ray is directed at right angle to the film and the teeth. For monitoring the healing of periodical lesion during the years, the X ray image needs to be standardized to keep the same horizontal and vertical angulations at every follow-up visits. Several film holding devices are available, which try to reproduce the same angulation and get comparable images but they can not ensure the same images anytime.