Specification of William Edward Newton : artificial teeth.

  • Newton, William Edward.
Date:
1862
Catalogue details

Licence: Public Domain Mark

Credit: Specification of William Edward Newton : artificial teeth. Source: Wellcome Collection.

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    t_ Newtons Improvements in Artificial Teeth. vulcanite itself, lias been by the dentist bending them before applying them to the setting, and the consequence has been that the pins have been very liable to tear out of the vulcanite. To obviate this difficulty, and supply the dentist with teeth which are applicable to the vulcanite without any preparation or 5 manipulation of the pins, and which, after vulcanization, will be so firmly imbedded and fastened in the vulcanite as not to be liable to disturbance by ordinary wear, or any probable accident, is the object of the present Invention. To this end the teeth are manufactured with pins having heads at their outer ends, which, when embedded in the vulcanite, will firmly hold therein. 10 In the accompanying Drawing Fig. 1 is a perspective view of three gum teeth A, A, A, made with platinum pins a, a, a, of the usual construction; Fig. 2 is a similar view of similar teeth made with platinum pins c, c, c, having heads d, d, d, at their outer ends, according to the present Invention; Fig. 3 is a front view of the same; Fig. 4 is a transverse section on a somewhat 15 larger scale; Fig. 5 is a perspective view of one of the pins before its insertion in the tooth, and drawn upon an enlarged scale; Fig. 6 is a transverse section of a pin illustrating a modification of the head. Similar letters of reference indicate corresponding parts where they occur in different Figures. In the manufacture of the teeth with pins having heads at their outer 20 ends, these heads d, d, d, may be of circular form projecting all round the pins, as shewn in Fig. 5, but in some cases it may be better to make them of the form shewn in Fig. 6, that is to say, that of a circle with a segment cut off, forming a straight side, the object being to avoid the protrusion of the head through the outer surface of the vulcanite; and the inner ends of the 25 pins which are received within the teeth may also be made in the usual manner with heads, as shewn at e, in Figs. 4 and 5 ; or they may be made of any other form that will enable them to be secured in the teeth; but with this latter part of the pin the present Invention has nothing to do. To provide for the insertion of the pins in the teeth, holes are made in the moulds for the 30 reception of the heads d, d, d, such holes being just large enough at the bottom for the heads d to fit tightly within them, and having a slight gradual enlargement toward their mouths, to allow the pins to draw out easily. Before moulding the teeth the heads of the pins are inserted in the holes, and the holes are filled up around the pin with some of the mineral composition of 35 which the teeth are made, after which the moulding of the teeth is proceeded with in the usual manner. On the opening of the mould and removal of the teeth, the composition with which the holes in the mould were filled up comes out with the pins, and is to be cut away from the teeth and pins before the baking process. Instead of the pins being inserted in this way, they may be