. Dental electro-therapeutics. A-ray, December 7, 1906. Another example is shown in Fig. 148; z-ray taken onDecember 7, 1906, which shows pyorrhoea started aboutthe superior incisors; this case was treated with zinc .r-ray taken on June 6, 1912, shows that no changehas taken place in the bone surrounding the roots of theteeth, except possibly a denser calcification. This appear-ance, however, may be due to the difference in length oftime in exposure when taking the .r-ray, but the loss of TREATMENT OF PYORRHCEA ALVEOLARIS 295 bone was no more than it was six years previously. Theprogr
. Dental electro-therapeutics. A-ray, December 7, 1906. Another example is shown in Fig. 148; z-ray taken onDecember 7, 1906, which shows pyorrhoea started aboutthe superior incisors; this case was treated with zinc .r-ray taken on June 6, 1912, shows that no changehas taken place in the bone surrounding the roots of theteeth, except possibly a denser calcification. This appear-ance, however, may be due to the difference in length oftime in exposure when taking the .r-ray, but the loss of TREATMENT OF PYORRHCEA ALVEOLARIS 295 bone was no more than it was six years previously. Theprogress of the pyorrhoea has been cheeked by a few treat-ments of zinc ionization and subsequent half-yearly treat-ments which consisted chiefly in thoroughly cleaning theteeth. Fig. 149. -Y-ray, June 6, 1912Fig. 150
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