Diseases of the soft structures of the teeth and their treatment; a text-book for students and practitioners . er any perspectiveview of the object, as only two dimensions are portrayed in thepicture. For routine diagnostic purposes such views answer quitewell. A more accurate knowledge is gained from stereoscopicpictures or from two or more roentgenograms taken at differentangles. To facilitate the intensifying of the very important minutedetails which naturally will assist in the correct interpretation ofthe roentgenogram, numerous devices have been suggested. Theprinciple involved in the us
Diseases of the soft structures of the teeth and their treatment; a text-book for students and practitioners . er any perspectiveview of the object, as only two dimensions are portrayed in thepicture. For routine diagnostic purposes such views answer quitewell. A more accurate knowledge is gained from stereoscopicpictures or from two or more roentgenograms taken at differentangles. To facilitate the intensifying of the very important minutedetails which naturally will assist in the correct interpretation ofthe roentgenogram, numerous devices have been suggested. Theprinciple involved in the use of these apparatuses centers about theadvantages obtained from the intensified contrasts between light anddarkness and in the magnification of the object. The Columbia 76 DISEASES OF Till-: DENTAL PI LP Magnifying Uadioscope and the Blum Binocular Dentascope areuseful instruments for such purposes. Acute types t periapical disturbances of verj recent date areusually not discernable in the roentgen-ray picture, since rarefac-tion of the Involved areas as yel lias not occurred. Chronic -. 1 :; I. Normal bone tissue abouli he upper molars.
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Keywords: ., bookcentury1900, bookdecade1920, bookiddiseasesofso, bookyear1922
