. Dental electro-therapeutics. e is more alveolar processabout the molar roots, and the posterior boundary of the lastmolar has a growth of alveolus resembling a molar, which is J^ ; Fig. 158.—Radiograph December 7, 1906. new bone. Allowing for a slight difference of angles atwhich the radiographs were taken, there is still a markeddifference in the appearance of the bone, the first showsmarked decalcification and morbid changes, the second showsa reformation of bone about the roots of the teeth. Theclinical changes are no less marked, the pyorrhea has entirelydisappeared, the gums are healthy
. Dental electro-therapeutics. e is more alveolar processabout the molar roots, and the posterior boundary of the lastmolar has a growth of alveolus resembling a molar, which is J^ ; Fig. 158.—Radiograph December 7, 1906. new bone. Allowing for a slight difference of angles atwhich the radiographs were taken, there is still a markeddifference in the appearance of the bone, the first showsmarked decalcification and morbid changes, the second showsa reformation of bone about the roots of the teeth. Theclinical changes are no less marked, the pyorrhea has entirelydisappeared, the gums are healthy and the teeth firm. Thepyorrhea was treated with zinc ions. Another example is shown in Fig. 158; radiograph taken onDecember 7, 1906, which shows pyorrhea started about thesuperior incisors; this case was treated with zinc ions. The PERIODONTAL DISEASE 297 radiograph taken on June G, 1912, shows that no changehas taken place in the bone surrounding the roots of theteeth, except possibly a denser calcification. This appear-. Fig. 159.—Radiograph June 6, 1912. ance, however, may be due to the difference in length oftime in exposure when taking the radiograph, but the loss ofbone was no more than it was six years previously. Theprogress of the pyorrhea has been checked by a few treat-
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