X-ray or gamma ray systems or devices – Photographic detector support – Dental
Patent
1996-10-11
1998-04-07
Porta, David P.
X-ray or gamma ray systems or devices
Photographic detector support
Dental
378170, 378105, A61B 614
Patent
active
057373884
DESCRIPTION:
BRIEF SUMMARY
The invention relates to intraoral dental radiography based on X-ray photography. To perform the photography method, a holder for an X-ray film or a digital picture plate comprising a film holder, a bite portion and an alignment rod, is used.
Traditionally dental radiography has been performed on an X-ray film exposed by an X-ray tube. A quite simple holder comprising two positions of which both have usually been perpendicular to the bar of the film holder has generally been used for positioning the X-ray film inside the mouth. The X-ray tube has, as a rule, been aligned by means of the bar. In many cases, X-raying with a holder has proved impossible due to the narrowness of the mouth, the target area, and less developed film holders. Therefore, various solutions involving cotton pads have been applied, whereby the patient presses the X-ray film into the desired position in the mouth. One such case is a shallow palate, which makes it impossible to X-ray especially the dental root tops with existing methods by means of a film holder. In this case the patient holds the film in place with his or her finger against the tooth using cotton pads, and exposure takes place almost at random, wherefore the angle between the film and the X-ray tube is not accurately known. With existing methods, the root tops do not always show on the film, and using finger placement by means of cotton pads easily results in an obscure picture, even if the so-called bisecting angle technique were used, as the angles are not accurately known. Introducing fingers into the mouth and using them as film holders is naturally also unpleasant and unhygienic as far as the patient is concerned.
In conventional X-ray film holders the bar is perpendicular and they have two positions, one for X-raying the roots and the other for so-called bite-wing radiography intended for X-raying the crown parts of opposing teeth. A digital picture plate is not applicable in a conventional film holder, where the slot usually is too small for the picture plate, and its use is essentially limited by the lack of possibilities of changing positions. Naturally, the advantages of modern digital technology and picture processing cannot be utilized when conventional film holders are used or when the film is placed manually. If the angle between the digital picture plate and the X-ray tube is known with reasonable accuracy, the digital picture may be amended on a display screen by a program which is designed for this purpose, and which will take into account the set angles and the distance between the picture plate and the X-ray tube, and will automatically calculate the corrections for the distortions they have caused. Conventional X-raying methods are slow, and the results may not be read until the picture has been developed. A digital picture is immediately readable.
Up to now, one of the problems has also been the difficulty of re-exposing in view of the so-called subtraction technique, as X-raying in exactly the same place and the same position has been problematic. It has also been difficult to X-ray files used in root canal therapy while they are positioned in the canals.
By the method and the holder for a picture plate or X-ray film of the invention, a decisive improvement may be attained over the existing methods.
The digital intraoral X-ray photography method of the invention and the holder for a picture plate or X-ray film applied therein are characterized by that which is set forth in the attached claims.
By means of the new method and device of the invention, intraoral X-raying becomes more hygienic, more reliable, easier and faster. The holder of the invention may be used in nearly all intraoral radiographs, including cases where the so-called cotton pad technique is currently applied. The holder may be used in all intraoral radiographs of the areas of the maxilla and mandible, and in the so-called bite-wing radiography, where the crown parts of upper and lower jaw teeth of the same side are X-rayed simultaneously. When the picture plate photography of the
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