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1 New York University College of Dentistry, New York, N. Y.
Analysis of roentgenograms of 500 patients who received periodontal treatment revealed that the various permanent teeth tended to fall into 3 broad categories of alveoloclasia-susceptibility. The classes in ascending order of susceptibility were found to contain:
Group I. Maxillary and mandibular first and second premolars and canines and the mandibular third molars.
Group II. Mandibular first and second molars.
Group III. Maxillary and mandibular first and second incisors and maxillary first, second and third molars.
Submitted on March 5, 1942
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