Greene brothers' clinical course in dental prosthesis : in three printed lectures; new and advance-test methods in impression, articulation, occlusion, roofless dentures, refits and renewals / by Jacob W. Greene.

  • Greene, Jacob W. (Jacob Wesley), 1839-1916.
Date:
[1914], ©1914
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Licence: Public Domain Mark

Credit: Greene brothers' clinical course in dental prosthesis : in three printed lectures; new and advance-test methods in impression, articulation, occlusion, roofless dentures, refits and renewals / by Jacob W. Greene. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    upper ones. They come together, as a whole, just exactly as our no^bite rims representing them did, compensating curve and all. But so far we have only a square, perpen- dicular strike; at least, without any knoicu close' occluding horizontal fit. But, in crush=grind- ing, the lower jaw, you know, has a little lat- eral motion; sometimes nicknamed the sheep- bite, and the quid=bite. While this lateral motion is never as ex- treme in the mouth as is generally shown as a possible movement of patent articulators, it is always there, to some extent, in uriimpeded natural masticatory action. And, of course^ artificial teeth should be adjusted to accommo- date the full natural side-grinding action. The wearer will seldom get the ])est without, say, an eighth of an inch sideways play. Now, the question is: How best to get this natural, lateral motion in an artificial denture? The claim for numerous articulators on the market is that they impart this and all other natural movements exactly to the artificial den- ture, including the anatomical relations of the teeth. This is indeed well. But granting the competency of the ma- chinery itself, there is a problematic combi- nation of ticklish factors in the way of prac- tical application. So the exact transference depends. It depends on (a) whether or not the dent- ist has the exact natural bite—very doubtful by usual methods: and (h) whether he has this exact natural bite on the articulators exactly as it was when tested in the mouth; and (c) whether he knows the exact movements of that particular jaw; and (d) whether he sets