X-RAY FILM HOLDER FOR USE IN MAKING DENTAL RADIOGRAPHS

Abstract: In an X-ray film holder for use in dental radiography and of the type comprising a ring (1) intended to be mounted on the draw tube of an X-ray tube, which ring carries a slidable arm or tube (3) which at its free end carries a plate holder (7 or 7') for an X-ray film, the plate holder is secured to a rod (6) either directly or by a supporting part (15), the end of said rod being embedded in a tubular portion (5) extending from the arm or tube (3), and furthermore in the tubular bar (3), which is hollow, a spindle (8) is situated the end of which can be tightened against the rod (6) In this manner, a plate-holder is obtained which can be adjusted to any angle to the pencil rays radiating from the X-ray tube.

Description: X-RAY FILM HOLDER FOR USE IN MAKING DENTAL RADIOGRAPHS TECHNICAL FIELD The present invention relates to an X-ray film holder of the type stated in the introduction of claim 1. BACKGROUND ART It is well-known that various radiographs are produced of a tooth dependent upon the angle formed by the x-ray film and the x-rays radiating from the drawtube (localizer) of the X-ray apparatus, and a dentist often requires such a variety of pictures of the same tooth. This may be achieved in the following manner. Instructed by the dentist, the patient holds the unexposed film against the inner side of the tooth to be radiographed, and then the dentist adjusts the localizer of the X-ray apparatus so that said tube and the plane of the film form the desired angle. There is a ris that the radiography fails when radiographed in the above manner, either because the patient has not held the unexposed film holder still during recording, or the film holder has been displaced, or because the dentist has made a wrong estimation of his adjustment. A film holder for X-ray photography of teeth is known from USA patent No. 3.003.062. This holder comprises a ring to be placed on the drawtube of the X-ray apparatus, and carries on a laterally extending arm a slidable bar, possibly bent, having a supporting and holding plate for an X-ray film secured at its end, thereby maintaining said film at right angles to the axis of the drawtube. From USA patent No. 3.473.026 a similar instrument is kno which varies from the first-mentioned holder in that the supporting or holding plate forms an angle of ab. 105 in relation to the axis of the drawtube. By means of the holders known from said two American pate specifications radiographs can in any case be made at two different angles, namely 90 and 105 . Actually, holders having angle positions other than 105 could be imagined. However, use of these known holders wo result in the necessity of having several different holde for each angle position. Such a system of holders can be used for most patients, b particularly in case of radiography of molars, a special structure of the jaws of certain patients or a particular path of the roots of a tooth can result in X-ray pictures no use to the dentist when determining the position of th condition that may require treatment, or diagnosing a pos sibly sick condition. DISCLOSURE OF INVENTION The object of this invention is to indicate a holder of t type mentioned in the introduction of claim 1, said holde being universally applicable. The fact that the plate holder may be secured in a desire position implies that the angle formed by the plate holde and the pencil of rays radiating from the drawtube of the X-ray apparatus makes it possible always to adjust the pl holder so that the bisector between the part of the tooth be radiographed and the X-ray film placed on the holder is positioned at right angles to the pencil of rays, irrespective of the structure of the patient's oral cavity, and irrespective of the path taken by a tooth root. In its most simple embodiment, the plate holder is made as stated in claim 2. The plate holder, according to this em¬ bodiment, can be used when producing radiographs both of the right part and of the left part of the oral cavity. In a more complicated embodiment, the plate holder is de¬ signed as stated in claim 3. This embodiment makes it possible .to apply one plate holder for making radiographs of the front portions both of the upper part of the mouth and the lower part of the mouth. BRIEF DESCRIPTION OF THE DRAWING The invention is further described in the following refe- rence being made to the drawing, wherein fig. 1 shows one embodiment, and fig. 2 shows another embodiment of the holder according to the invention, whilst fig. 3 shows the plate holder applied in case of the embodi- ment according to fig. 1, and fig. 4 is a sectional view of the slidable bar of the holder. BEST. MODE. OF CARRYING OUT THE INVENTION In fig. 1, 1 is a ring member to be placed on the drawtube of an X-ray tube. 2 is an arm extending from said ring, in which arm a cylindrical tube 3 is situated and slidable in said arm 2 and capable of being secured in a required posi¬ tion by means of a tightening screw 4. The tube 3 ends in a transverse tube portion 5, in which a rotatable rod 6 is placed carrying a plate holder 7. In tube 3 a spindle 8 is placed, which at the free end of the tube has a thread 9 engaging an internal thread 10 in the tube 3. The spindle 8 is turned by means of a knob 11, and at its opposite end 12 it is tapered so that it may be pressed down into a 13 in the rod 6 . At both sides of the plate holder 7,means 14 are provided for securing the envelope which contains the X-ray film i tended for the requested radiograph. In plate holder 7 of fig. 3, rod 6 is fastened at one of the lateral edges of the plate holder. In the plate holde 7 shown in fig. 2, a supporting part 15 extending perpend cularly to the plate holder is placed between said plate holder 7 and the rod 6. / L -

Claims: CLAIM A holder for X-ray film for use in making dental radiographs, which holder mainly comprises a ring member (1) arranged to be placed on a drawtube of an X-ray tube, said ring having a laterally extending arm (2) and a tubular bar (3) slidably and rotatably placed in an opening of the arm (2), said bar carrying at its one end a supporting or holding plate (7) for an X-ray film, c h a r a c t e r i z e d in that the supporting or holding plate (7) is placed on a rod (6) ex- tending laterally from bar (3) , said rod designed so as to be rotatable around an axis perpendicular to the axis of the bar (3) and independently of the turning of bar (3) .

Inventors: SIMONSEN E
Applicants: SIMONSEN E
Application year: 1981
Main classification: A61B6
IPC codes: A61B6, G03B42