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Více informací o knize Hand-Carved Porcelain Shell and Other Crowns, Together with Amalgam Model Technique for Crowns and Inlays (Classic Reprint)

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Excerpt from Hand-Carved Porcelain Shell and Other Crowns, Together With Amalgam Model Technique for Crowns and Inlays If the vital tooth is in a conspicuous position in the mouth a temporary crown made by hollowing out a detached post crown for the anterior teeth or the use of an old gold crown or even a copper band filled with cement for the posterior is indicated, as this serves to hold away the gum from the ledge lying under it and so facilitates the subsequent cementation as well as prevents irritation of the gums lying over the shoulder itself. Leaving teeth in this condition removes the chief occasion for haste in setting the final crown, and makes it possible to carry on more leisurely the necessarily involved laboratory technic. Experience has shown that teeth that are quite sensitive before cementation of a porcelain shell soon become entirely comfortable even to applications of cold water, due to the very high insulating properties of the porcelain. With bell-crowned bicuspids and molars, it is frequently unnecessary to extend the lingual shoulder further gingivally than to the greatest diameter of the tooth, and in many other cases not much more than the enamel is removed. Operative Technic The operative technic varies with the location of the tooth in the arch, the amount of tooth substance already lost, and the position of the adjoining teeth. Briefly, the object is to reduce the stump to a somewhat conical shape, with its base toward the gum; which base is surrounded by a shoulder or ledge about 0.5 mm. wide and located just under the free margin of the gum. Of course, where deep cavities exist these need only be cut out or filled with cement so as to present a uniform tapering surface, toward the incisal or occlusal, so that an impression of the stump may be withdrawn without distortion. The tapering of the sides is easily done with knife-edged stones, Halls flexible disks, mounted cylindrical stones, chisels, and burs, but great care is necessary in the preparation of the shoulder. For this purpose square and fissure burs of small size, Millers cylindrical stones, safe-sided end-cutting burs and Blacks hatchets and chisels are all used. The ledge as well as the stump should be left with a surface as smooth and highly polished as practicable to facilitate the withdrawal of the impression. After shaping up the stump, but before cutting the ledge, a copper band approximately as long as the adjoining teeth, or at least longer than the stump, should be fitted fairly closely and shaped to firm contact with the proximate teeth, carefully festooning out for the curvature of the gum. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Parametry knihy

Zařazení knihy Knihy v angličtině Medicine Other branches of medicine Dentistry

• Plný název: Hand-Carved Porcelain Shell and Other Crowns, Together with Amalgam Model Technique for Crowns and Inlays (Classic Reprint)
• Autor: Dr Geo L Bean
• Jazyk: Angličtina
• Vazba: Brožovaná
• Počet stran: 26
• EAN: 9781330125311
• ISBN: 9781330125311
• ID: 09636724
• Nakladatelství: Forgotten Books
• Hmotnost: 50 g
• Rozměry: 229 × 152 × 1 mm
• Datum vydání: 02. July 2015

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