. Interpretation of dental and maxillary roentgenograms . Fig. 230.—Horizontal impaction of the lower left third molar. Crown not cov-ered by bone. Decay of crown of second molar, shown by dark area. Upper thirdmolar unerupted, and lying slightly to one side of second Fig. 231.—Horizontal impaction of lower right third molar. OccUisal surface ofcrown is tightly in apposition with posterior surface of crown and root of secondmolar. Upper third molar partially erupted with occlusal surface of crown directedbackward. INTEEPEETATIOX OF EOEXTGEXOGRAMS 131

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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectradiographydental