Mechanical Dentistry: A Practical Treatise on the Construction of the Various Kinds of Artificial Dentures : Comprising Also Useful Formulae, Tables, and Receipts for Gold Plate, Clasps, Solders, Etc. Etc. EtcLindsay & Blakiston, 1878 - 279 páginas |
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Mechanical Dentistry: A Practical Treatise On the Construction of the ... Charles Hunter Sin vista previa disponible - 2022 |
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accurately acid adopted alloy appliance aqua regia articulation artificial palate artificial teeth attached bicuspids bite blowpipe borax canine tooth carats carefully cast cavity celluloid cement chamber clasp close colour copper defect dentists dwts edentulous edge elasticity employed fastened filled firing model fissure fitted flame flask give gold plate graver gutta-percha hard palate heat hole imbedded impression inch incisors inserted iron joint latter lingual surface lower main plate manner material melted metal method molar mould mouth nasal necessary nitric acid obtained obturator ordinary packing palate surface perfectly piece pins pivot placed plaster model platinum pliers position purpose readily removed ridge root round sand shape side silver slightly soft palate soft rubber solder solution specific gravity substance sufficient swaging swivel taken thickness tooth tray tube upper vulcanite vulcanizing wire zinc
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Página i - Dentistry. MECHANICAL DENTISTRY: A Practical Treatise on the Construction of the various kinds of Artificial Dentures. Comprising also Useful Formulae, Tables and Receipts for Gold Plate, Clasps, Solders, &c. &c. By CHARLES HUNTER. Third Edition, Revised, With upwards of 100 Wood Engravings. Crown 8vo, 35. 6d. cloth. " The work is very practical."— Monthly Review of Dental Surgery.
Página 47 - The operation depends upon a little artifice in blowing through the pipe, which is in reality more difficult to describe than to acquire. " The effect intended to be produced is a continual stream of air for many minutes, if necessary, without ceasing. This is done by applying the tongue to the roof of the mouth, so as to interrupt the communication between the mouth and the passage of the nostrils ; by which means the operator is at liberty to breathe through the nostrils, at the same time that...
Página 249 - Any old acid will do for this purpose. In large factories the acid used for dipping before plating is generally afterwards employed for the above purpose of cleaning. The article being thoroughly cleaned and dried, has a copper wire attached to it, either by twisting it round the article or putting it through any open part of it, to maintain it in suspension. It is then dipped into nitric acid as quickly as possible, and washed through water, and then immersed in the...
Página 10 - They are thus made: take a wax impression and make a model; in partial cases, brush over the teeth of the model one or two layers of thin plaster, to fill up all undercuts, and to make the plate fit loosely; saturate the model with water, and mould over it a gutta-percha cup. This last is done, not by using the gutta-percha in sheet, but by first making into a ball, then working it from the palate outward, leaving a thick mass in the centre. It should be, on the inside, from onefourth to one-half...
Página 249 - The ley should have about half-a-pound of soda-ash, or pearl-ash, to the gallon of water. The nitric acid, into which the article is dipped, may be diluted to such an extent that it will merely act upon the metal. Any old acid will do for this purpose. In large factories the acid used for dipping before plating is generally afterwards employed for the above purpose of cleaning. The article being thoroughly cleaned and dried, has a copper wire attached to it, either by twisting it round the article...
Página 243 - The silver to be prepared for this should be of a thickness sufficient to carry the current of electricity, and should be roughened by brushing it over with a little strong nitric acid, so that a frosted appearance is obtained. It is then washed and placed in a vessel with dilute sulphuric acid, to which a few drops of nitro-muriate of platinum has been added. A porous tube is then placed into this vessel with a few drops of dilute sulphuric acid ; into this tube a piece of zinc is put, contact being...
Página 249 - ... cleanse away any tarnish from the surface, and prevents the formation of air-bubbles. They are then kept in clean water until it is convenient to immerse them in the gold solution. One immersion is then given, which merely imparts a blush of gold ; they are taken out and again brushed ; they are then put back into the solution and kept there for three or four minutes, which will be sufficient if the solution and battery are in good condition ; but the length of time necessarily depends on these...
Página 204 - When the ether is evaporated, the caoutchouc becomes again solid, but is somewhat clammy for a while. When treated with hot naphtha, distilled from native petroleum, or from coal tar, it swells to 30 times its former bulk ; and if then triturated with a pestle, and pressed through a sieve, it affords a homogeneous varnish, which being applied by a flat edge of metal or wood to cloth, prepares it for forming the patent water-proof cloth of Mackintosh. Two surfaces of cloth, to which several coats...
Página 189 - ... of an inch, thus embracing the entire free edge of the soft palate. This last provision enables the natural palate to carry the artificial palate up or down, as articulation may require. When the organs of speech are in repose, there is an opening behind the palate sufficient for respiration through the nares. When these organs are in action, a slight elevation of the palate or a contraction of the pharynx will entirely close the nasal passage and direct all the voice through the mouth. The palate...
Página 223 - PLATINUM is a metal of a grayish-white color, resembling in a good measure polished steel. It is harder than silver, and of about double its density, being of specific gravity 21. It is so infusible, that no considerable portion of it can be melted by the strongest heats of our furnaces. It is unchangeable in the air and water ; nor does a white heat impair its polish. The only acid which dissolves it, is the nitro-muriatic ; the muriate or chloride thus formed, affords, with pure ammonia or sal...