. The science and practice of dental surgery. Fio. 553.—Rarefying periodontitis. Model of .the left side of amandible showing the second molar impacted between thefirst and third molars. 1898-9, against another, and occurs sometimes in anupper lateral incisor at the time of eruption ofthe canine, or in the distal root of a second 498 molar through impaction of the third the most part absorption is caused by chronicapical abscess, and occurs frequently in instanceswhere root-fillings or broaches have been allowedto reanain protruding beyond the apex of a Fig. 554. — Kanfyint;
. The science and practice of dental surgery. Fio. 553.—Rarefying periodontitis. Model of .the left side of amandible showing the second molar impacted between thefirst and third molars. 1898-9, against another, and occurs sometimes in anupper lateral incisor at the time of eruption ofthe canine, or in the distal root of a second 498 molar through impaction of the third the most part absorption is caused by chronicapical abscess, and occurs frequently in instanceswhere root-fillings or broaches have been allowedto reanain protruding beyond the apex of a Fig. 554. — Kanfyint; ijiiiodnntil is. Sliowing thecondition of tlie second lower molar in Fig. 553after extraction. A foreign body in contact with the root mayalso lead to absorption. The operations of Replantation, Transplan-tation, and Implantation, of teeth are usuallyfollowed by a rarefying periodontitis, whichmay extend over the entire root of the displacement resulting from a blowor fall, and malocclusion, are also causes ofthis condition, while in some cases no definitelocal cause can be assigned, the root becomingabsorbed, apparently, as a result of some obscurereaction of the surrounding tissues. To the naked eye the appearance of thelesions will depend upon the severity of theprocess and the position in which absorptionoccurs. When the irritation has been slight,continuous, and affecting the ajiex of the tooth,the root is usually rounded and moderatelysmooth. When the process has acted upondifferent parts of the root at the same time (asis the case with many
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
