Page 20 - Craventreatiseonpyorrh00crav

— CHAPTER I. PYORRHCEA ALVEOLA RI8. (Phagedenic Pericementitis ; Riggs' Disease. Calcic Inflammation ) Whatever may be the apparent present cause of a given case of phorrhcea alveolaris, it must be admitted that the formation of calcarious matter in crusts about the necks of teeth is con- ducive to establishment of that disease. Whatever tributary effects are to be anticipated from pro- gressive organic disease as in affections of the kidneys, bladder or lungs must be left largely to the future of individual cases to determine ; that such influences are operative in a measure, is manifested often by extraordinary tendency to calcarious deposition upon the teeth of certain subjects, or by an observa- ble inconstancy of the gum about the necks of some or all teeth. Either of these manifestations would indicate organic disturbance extending far back of any local conditions, and depending upon constitutional obliquity that may be heredi- tary or acquired—and in the latter case may be temporary. For the purposes of this work I have classed salivary cal- culus under two heads visible and invisible. VISIBLE CALCULUS—TARTAR. The first class consists of accumulations of salts of lime that constantly are precipitated from saliva in the mouth, together with particles of oral and extraneous matters that become in- volved in; tjie.mass ^hich:is commonly observed and called ( i i