OF MOUNTING ARTIFTCIAL TEETH. 131 



method of casting a plate, at the same time se- 

 curing the teeth properly adjusted. 



It is proposed to you as at once securing the 

 best-fitting plate, the most reliable attachment 

 for holding the teeth, the least expensive and the 

 most rapidly executed, although not employing 

 the least skill ; and it may be said not to lack 

 real beauty in comparison with the most received 

 processes for beauty, and is also the most cleanly 

 in wear as well as safely and reliably repaired 

 when broken or injured. 



It is the best-fitting because the plate is obtained 

 without change or injury from manipulation, an 

 exact counterpart of the impression. The cast 

 from the impression, usually known as the plaster, 

 being formed of a composition which undergoes 

 no perceptible change in working, that is, it is 

 not injured by pressure or too much friction, is 

 free from perceptible shrinkage and warping whilst 

 subjected to the heat of a common oven, say 400°. 

 The metal being cast upon this, it possesses sufii- 

 cient strength to resist the little tendency of 

 shrinkage in the metal, which may be stated at 

 g^th of an inch; so that the palatal surface of 

 the plate must be the exact counterpart of the 

 impression, and this being correctly taken from 

 the mouth in plaster, or by other means, must be 

 the palate's facsimile, and requires but little exer- 

 cise of reason to accord to it the claim of a nearly 

 perfect adaptation. 



K 2 



