. Oral pathology and practice. A text-book for the use of students in dental colleges and a hand-book for dental practitioners. l conditions. The first named will be apparentwhen the teeth are erupted, while the last will only be observed as anatural effect of the anomalous surrounding circumstances. It has already been asserted that enamel is a modification ofbone, composed of precisely the same elements, though in varied CONGENITAL IMPERFECTIONS OF ENAMEL. 229 proportions and modified structure. (See Chapter XXII.). Itsgrowth is a physiological process, and is subject to natural
. Oral pathology and practice. A text-book for the use of students in dental colleges and a hand-book for dental practitioners. l conditions. The first named will be apparentwhen the teeth are erupted, while the last will only be observed as anatural effect of the anomalous surrounding circumstances. It has already been asserted that enamel is a modification ofbone, composed of precisely the same elements, though in varied CONGENITAL IMPERFECTIONS OF ENAMEL. 229 proportions and modified structure. (See Chapter XXII.). Itsgrowth is a physiological process, and is subject to natural derangements may, however, induce such deflectionsof nutritive currents, or such structural imperfections in the forma-tive enamel matrix, as may result in defects or faults, or evenentire absence of enamel. It is readily conceivable that any func-tional disturbance of a grave character might bring this about, butas the tissue is of epiblastic origin, any disease which materiallyinvolves epithelial structure, it might easily be imagined, would,during the formative period of enamel, leave upon it an indelible Fig. Figs. 66 and 67 as They Appeared in Occlusion. The Condition was that whichwas Natural in this Case and Not the Effect of Wear. mark. Hence to the eruptive diseases of childhood have beenascribed, correctly or incorrectly, very many of the imperfectionswhich are found in enamel when the tooth is erupted. That this isthe sole cause the many varying phenomena would make very im-probable, to say the least. It is sometimes the case that no crown whatever is developed,and instances have been known in which all of the permanent teethwere practically crownless, although the roots were fully grown andof the ordinary size, and the alveolar process was of the usual pro-portions. Such a case in the practice of the author is representedin Figs. 66, 67, and 68. The peculiarity in this instance was 23O ORAL PATHOLOGY AND PRACTICE. hereditary, inclining to follow the law of
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