. Elementary and dental radiography / by Howard Riley Raper . made at dif-ferent angle. Wire seems to pass to distal,but in reality passes too far to the buccal.(See Fig. 422.) POINT TO BUCCAL OF CANAL Fig. 422. Diagram explanatory of Fig. 421. seen clearly and the case was diagnosed a perforation through the side ofthe root with the canal filling passing through it. 20. To State Definitely, From the Appearance of Flat Radio-graphs (Not Stereoscopic Radiographs) That Impacted Teeth Lieto the Lingual or Facial of the Other Teeth. It is practically always impossible to determine, from a single f
. Elementary and dental radiography / by Howard Riley Raper . made at dif-ferent angle. Wire seems to pass to distal,but in reality passes too far to the buccal.(See Fig. 422.) POINT TO BUCCAL OF CANAL Fig. 422. Diagram explanatory of Fig. 421. seen clearly and the case was diagnosed a perforation through the side ofthe root with the canal filling passing through it. 20. To State Definitely, From the Appearance of Flat Radio-graphs (Not Stereoscopic Radiographs) That Impacted Teeth Lieto the Lingual or Facial of the Other Teeth. It is practically always impossible to determine, from a single flatnegative, the facio-lingual location of an impacted tooth. The radio-dontist should make stereoscopic radiographs or he should refrain from 378 APPENDIX making himself absurd by making definite statements regarding some-thing of which he has no definite knowledge. 21. To Mistake a Small Cervical Filling For a Pulp Fig. 178 and the description of it. 22. To AtsurviE That a Filling in the Crown of a ToothEnters the Pulp Chamber When it Does Fig. 423. The canal filling in the crooked buccal root of the first bicuspid was thought to be canal filling material passing through the side of the root; the outline of the buccal root is not distinct and so was not seen by the diagnostician. Unless the filling enters the pulp chamber as in Fig. 444 or unlessthe cavity is a simple occlusal one without buccal or lingual extensionsit is usually impossible to determine whether a filling in the crown of atooth encroaches on the pulp or not. Proximo-occlusal fillings and fillingson the buccal and lingual surfaces often have the appearance of en-croaching on the pulp when their shadow only overlaps the pulp in theradiograph. When it is suspected that a filling encroaches on the pulp,an ocular study of the tooth and filling should be made. This was donein the case of Fig. 444, for example, and the outline of the cavity in thetooth was such as to fail to explain at all the project
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