. Elementary and dental radiography . ent thatthe temporary tooth roots resorb independently of the succedaneous teeth,because of what I see in the radiograph in Fig. 302. Fig. 302 butillustrates what has been observed in many other radiographs. Dr. H. A. Ketcham, with the aid of radiographs, has endeavored todisprove that certain orthodontic procedures caused impaction of thethird molars. The discussion of the orthodontic procedure of Tigs. 303 and 304. opening the maxillary suture is one in which the radiograph is yet playing an important role. That THE USES OE THE RADIOGRAPH IX DEXTISTRV 26


. Elementary and dental radiography . ent thatthe temporary tooth roots resorb independently of the succedaneous teeth,because of what I see in the radiograph in Fig. 302. Fig. 302 butillustrates what has been observed in many other radiographs. Dr. H. A. Ketcham, with the aid of radiographs, has endeavored todisprove that certain orthodontic procedures caused impaction of thethird molars. The discussion of the orthodontic procedure of Tigs. 303 and 304. opening the maxillary suture is one in which the radiograph is yet playing an important role. That THE USES OE THE RADIOGRAPH IX DEXTISTRV 267 this suture can be opened is claimed by Dr. Varney C. Barnes. Figs. 303and 304 are from the practice of Dr. Barnes. How wide it may be opened,the permanency of the separation of the bones, and the benefits to bederived from the operation I shall not discuss, but radiography will al-ways be a valuable aid in determining the condition, both before and aftertreatment. In the discussion of a paper, read at a dental society meeting,


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