A practical treatise on mechanical dentistry . ving been previously securedfrom a wax or modeling compound impression) should be secured inthe articulator as illustrated in Fig. 102. Articulators.—Various articulators have been devised. Fig.103 illustrates one of the simpler forms, while a very ingenious andnovel device has been brought to the notice of the profession byDr. W. G. A. Bonwill, to which we give considerable space. Theinventor has characterized it as the Anatomical Articulator, anddescribes it as follows: ENTIRE DENTURES ATTACHED TO SWAGED PLATE-BASE. 243 It is modeled on the same
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A practical treatise on mechanical dentistry . ving been previously securedfrom a wax or modeling compound impression) should be secured inthe articulator as illustrated in Fig. 102. Articulators.—Various articulators have been devised. Fig.103 illustrates one of the simpler forms, while a very ingenious andnovel device has been brought to the notice of the profession byDr. W. G. A. Bonwill, to which we give considerable space. Theinventor has characterized it as the Anatomical Articulator, anddescribes it as follows: ENTIRE DENTURES ATTACHED TO SWAGED PLATE-BASE. 243 It is modeled on the same geometrical system as the human jaw. I found by measurement that the average width of the lowerjaw from center to center of each condyle was four inches, and fromthe same center of each condyloid process to the median line of thelower jaw. where the cutting edges of the lower incisors meet, wasalso four inches, making of the human jaw an equilateral triangle.This holds good in all jaws, and the difference of Y of an inch in this Fig. 102.. radius of a circle of four inches would make but little practical dif-ference as to the results. This beautiful law enables us to have the fullest benefit of mas-tication at the least expense of power and motion in the arc of thecircle of four inches as a radius. This being an absolute law, I have so made this articulator, andthe cast of every case is set therein with the median line at the lowercentrals just four inches, by the dividers, from each condyloid pro-cess. If an unusually large jaw, then the cast is put a very littledistance further out. For all full sets, the articulation is so perfect, as made in this, inthe laboratory, as to need but a trifling touch in fitting: in the mouth. 244 MECHANICAL DENTISTRY. I found that there is a further positive law in the mechanism ofthe human jaw that should be regarded in every substitute madetherefor, and that is, just in proportion to the depth of overbite ofthe centrals, there is a curvat