Dental review; devoted to the advancement of dentistry. . structed by bone or by some other tooth. The teeth most fre-quently impacted are the lower third molars. Many theories areadvanced as to the etiology of impacted third molars, but the oneadvanced by Brophy is most excellent. He says, In the develop-ment of the mandible the first permanent molar is developed in thebody of the bone about the sixth year a little anterior to the the body of the bone lengthens in its development, the secondmolar also appears just posterior to the first molar and in front ofthe ramus. The body length
Dental review; devoted to the advancement of dentistry. . structed by bone or by some other tooth. The teeth most fre-quently impacted are the lower third molars. Many theories areadvanced as to the etiology of impacted third molars, but the oneadvanced by Brophy is most excellent. He says, In the develop-ment of the mandible the first permanent molar is developed in thebody of the bone about the sixth year a little anterior to the the body of the bone lengthens in its development, the secondmolar also appears just posterior to the first molar and in front ofthe ramus. The body lengthening still more in its growth, the thirdmolar erupts posterior to the second, and directly in front of ramus. 142 THE DENTAL REVIEW If, however, the body of the bone fails to lengthen sufficiently toadmit of the normal eruption of the third molar, it may take aposition with its occluding surface directly in contact with theposterior surface of the second molar, while its roots extend upwardinto the ramus of the bone. The tooth thus lies in a horizontal. Fig. 1. position, nearly, or quite parallel to the lower border of the bone(as in X-Ray below, Fig. 1). A tooth in such a position maycause extreme discomfort by reason of pressure directly upon thethird or mandibular branch of the fifth nerve. It may readily beseen that the root ends of a tooth may come in direct contact withthis large nerve and thus cause neuralgia. It may by reason of its ORIGINAL COMMUNICATIONS. 143 pressure, cause extreme swelling involving the surrounding softparts. The cardinal symptoms of impacted third molars are, rapidrise in temperature, a foul odor of the breath, the patient is unableto move the jaw in some directions without considerable pain, the
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Keywords: ., bookcentury1900, bookdecade1910, bookpublis, booksubjectdentistry
