The metallic inlay

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 Excerpt: ...correctness of the bite, the contact point, and the margins. If the form cannot be tried in the mouth, the following method must be employed. After the impression of the cavity has been taken, a piece of fairly hard modelling compound, about the size of a hayel-nut is placed upon the cavity and the patient requested to occlude. The result is an impression of the margins of the cavity, the proximal surfaces of the adjoining teeth, and the occlusal surface of the antagonist. The model of the cavity is then placed in this impression so, that the margins of the cavity on the model and those in the impression exactly correspond. After attaching the cavity model to the impression with wax, the model of the bite is poured in plaster, in two parts. If the bite has been taken carefully, and the model of the cavity placed exactly in the bite impression, a true reproduction of the conditions in the mouth will be obtained. In spite of the greatest care, this method does not give as good results, as trying the wax form, previously carved on a model, in the mouth. The direct impression. Until lately, this method of taking an impression has not received the recognition of which it is worthy. It represents in the field of metallic inlay technic, an advance, equal almost to the introduction of casting. It was necessary in the old swedged and soldered inlays to construct the form in three stages. First the impression in the mouth, then the cement model, and lastly the swedged matrix. Each of these stages represents a source of error for the perfect fit of the inlay. The introduction of casting, obviated the necessity of making a matrix, and it soon became evident by the better adaptation of the inlays, that one source of error at least, had been partially removed. Only parti...