. The Dental cosmos . s so different in character that it mighteasily be mistaken for another form ofdeposit. It is much darker in color, isless in quantity, and is much more dense,owing to the fact that it is deposited moreslowly. This variety is found underneaththe free margins of the gums; sometimesit entirely encircles the tooth. While nothing really conclusive con-cerning this variety of deposit has beenworked out, it seems reasonable to sup-pose that the slight deposits of food andother materials which can nearly alwaysbe found underneath the free margins ofthe gums serve as a starting-p
. The Dental cosmos . s so different in character that it mighteasily be mistaken for another form ofdeposit. It is much darker in color, isless in quantity, and is much more dense,owing to the fact that it is deposited moreslowly. This variety is found underneaththe free margins of the gums; sometimesit entirely encircles the tooth. While nothing really conclusive con-cerning this variety of deposit has beenworked out, it seems reasonable to sup-pose that the slight deposits of food andother materials which can nearly alwaysbe found underneath the free margins ofthe gums serve as a starting-point for the deposit of calcium salts. If a prophy-lactic file be inserted beneath the freemargins of the gums, it can usually bewithdrawn fairly well filled with a softdeposit, probably composed of broken-down food material, bacteria, tissuecells, etc. This deposit occupies the areawhich, unless the teeth are given prophy-lactic treatment, will probably be occu-pied by the deposit of dark salivary cal-culus. Fig. Permanent splint holding four lower to canines may be made bydevitalizing these and making use of posts,inlays, or by putting bolts through fromlabial to lingual. A piece is cast for thelingual surface and occupying a positionnear the incisal edge. Holes are drilledthrough the natural tooth and cast are made of iridio-platinum wire,No. 20 gage, and threaded to take a goldnut. Gold nuts shown unfinished on rightcentral and lateral. Gold nut finisheddown in left lateral. DEPOSITS ON THE ROOTS. The deposits on the roots of the teethdiffer from salivary deposits in amount,in color, and in origin. They may occurin small patches or in a thin layer, whichmay extend about a considerable portionof the root. They are never found inmasses, as is generally the case with sali-vary calculus. TREATMENT. Proper treatment consists of the re-moval of irritants, medicinal and me-chanical assistance, and home treatmentby the patient. The removal of t
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentist, bookyear1912
