Applied orthodontia

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 Excerpt: ...in such a manner as to cause the shadows of the desired structures to be imposed upon the plate. This method entails much less discomfort to the patient than the intra-oral method (in which small films are held in the mouth opposite the areas desired) and greatly reduces the number of exposures necessary as one exposure of each side will usually suffice unless the structures Fig. 87.--Table with head support for extra-oral roentgenography. Fig. 8S.--Showing the manner of using the table and head support in making an extra-oral roentgenogram of the left side. Fig. 89.--Table and head support adapted to the dental chair. Fig. 90.--Showing the manner of using the table and head support in making an extra-oral roentgenogram of the left side. near the median line are under examination. For this reason the writer feels that when it is possible to obtain the necessary information by the extra-oral technic, it should be done. The wisdom of this course shoidd be apparent to anyone who has had the experience of having intra-oral films placed lingually to the mandibular teeth where the tissues are so sentitive or has had them placed back in the molar region against the palate where they so frequently produce gagging. However, this statement should in no wise be construed as a protest against the use of intra-oral films for it is often necessary to utilize them in spite of the afore-mentioned disadvantages. One of the secrets of obtaining good extra-oral roentgenograms is to be found in the manner in which a patient is seated and the head supported for the exposure. As it is very essential that the face shall occupy a definite relationship against the plate and that the.r-ray tube and accessory apparatus shall be properly and accurately arranged for the exposure, some ...