. Oral pathology and practice. A text-book for the use of students in dental colleges and a hand-book for dental practitioners. all the colorization changes have ceased. As it is difficult to force the bleaching agent very far into the• dentinal tubuli, it is usual to cut out all the discolored tissue that it CONGENITAL IMPERFECTIONS OF ENAMEL. 22J is possible to spare before commencing the process. The bleach-ing interferes with the integrity of the tissue, and weakens thetooth. Large contour restorations, after this process, are thereforelikely to fail; this fact, with the liability to recur
. Oral pathology and practice. A text-book for the use of students in dental colleges and a hand-book for dental practitioners. all the colorization changes have ceased. As it is difficult to force the bleaching agent very far into the• dentinal tubuli, it is usual to cut out all the discolored tissue that it CONGENITAL IMPERFECTIONS OF ENAMEL. 22J is possible to spare before commencing the process. The bleach-ing interferes with the integrity of the tissue, and weakens thetooth. Large contour restorations, after this process, are thereforelikely to fail; this fact, with the liability to recurrence o^ the pig-mentation, has made crowning rather to be preferred in many cases. CHAPTER L. CONGENITAL IMPERFECTIONS OF ENAMEL. While enamel is organic in the sense that it is the product offunction or growth, its proportion of living matter is so small thatnatural reparative processes or spontaneous degenerative changesare practically impossible. Its proximate principles are inorganic,though of organic origin. In the eruption of the tooth all connec-tion between the enamel and its formative organ is necessarily de-. roTAL Lack of Development of the Crowns of the Teeth. Cast of the Upper Jaw of a Young Man. The Peculiarity is the Result of Inheritance. (From a case in practice.) stroyed. Its relations are such that there can be no nutritive circu-lation, and hence practically it can undergo no changes except suchas are retrogressive in their nature. And yet, because of its con-nection with vital tissue, the proportion of living matter in itscomposition, which though small, is constant, as well as the fact ofits genetic origin from bone, of which it is a modification, its con-sideration as inorganic is forbidden. 228 ORAL PATHOLOGY AND PRACTICE. These facts indicate that enamel degenerations are not, strictly-speaking, pathological, and that their treatment must be from achemical and mechanical standpoint, rather than from one which ismedicinal or vital. By this it is not m
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