A manual of dental anatomy : human and comparative / by Charles S. Tomes.

Date:
1894
Catalogue details

Licence: Public Domain Mark

Credit: A manual of dental anatomy : human and comparative / by Charles S. Tomes. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

    43/614 (page 29)
    PENTTNIi. (Jalippe gives—• Water and organic matter Mineral matter 2o-29 74-71 Soluble ash (alkaline chlorides, and phosphates) . Calcinm carbonate ^lagnesinm carbonate (.'alcium Magnesium Phosphoric acid . Silicates . Undetermined •054 0- 35 1- 13 45-11 1-67 23-7 •04 1-8 The dentine of many mammals is very much more rich in magnesium phosphate than human dentine is; even the latter, it would seem, from the discrepancies existing between the various analyses, is variable in composition, but, on the whole, it may be said that, amongst inorganic constituents of dentine, calcium phosphate largely ])repon- derates ; from 3^ to 8 per cent, consists of calcium carbo- nate ; a much smaller proportion consists of magnesium pliosphate, while calcium fluoride exists in traces only. The organic basis of tlie matrix is closely related to that of bone, with which however it is not identical; it is of firmer consistence, and does not readily yield gelatine on boiling, but, according to Kiilliker (wlio quotes Hoppe), the dentine of the pig yields a substance resembling glutin, the dentinal globules remaining undissolved. 'I'he animal basis of the dentine is called dentine cartilage, and is readily obtainable by submitting a tooth for several dajs to the action of diluted acids. The form and most of tlie structural characteristics of a tooth so treated arc main- tained, the dental cartilage forming a tough, licxiblc, and •clastic semi-trans])arcnt mass.