A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . alveolar processes exertin characterizing the facial outlines, may be carefully and intelligently studied inall their phases of malrelation. The author wishes it to be understood, however,that he has no objection to the practice of taking preHminary plaster impressionsfor models of study—especially by those who cannot or do not obtain perfectimpressions with plastic material—if for no other reason than it tends to cultivatehabits of nicety and exactitude in other more important
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . alveolar processes exertin characterizing the facial outlines, may be carefully and intelligently studied inall their phases of malrelation. The author wishes it to be understood, however,that he has no objection to the practice of taking preHminary plaster impressionsfor models of study—especially by those who cannot or do not obtain perfectimpressions with plastic material—if for no other reason than it tends to cultivatehabits of nicety and exactitude in other more important branches which pertainto the art of regulating teeth. 139 140 PART V. PRIMARY PRINCIPLES OF PRACTICE For the taking of Modeling Compound Impressions of the teeth, a Tray shouldbe selected that can be easily introduced, and one which will carry the compoundwell over the labial and buccal surfaces of the teeth and gums. Trays shaped andconstructed similar to certain forms of the Ash and Sons trays, but differing inimportant particulars to facilitate introduction, are procurable, and in sizes adapted Fig. to the mouths of children as well as to adults. In Fig. 80, it will be noticed thatthe posterior buccal extensions are considerably lowered. Use good modeling compound, softened in hot water to a consistency that willtake a sharp imprint. (The author prefers the white compovmd manvifactured bythe Dental Mfg. Co. of New York City.) Warm the tray and place only a suffi-cient amount of the compound in it to take the complete impression. See that theimpression surface is smooth and free from creases. Finally, warm the surface bypassing it lightly over dry heat. One of the greatest faults, and the one too that is the most common, is toallow the surface of the compound, before introduction, to become cooler and con-sequently harder than the body of the compound beneath, whereas, the oppositeconsistency should be the endeavor. The compound should never be heated to theextent of
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Keywords: ., bookcentury1900, bookdecade1920, bookidpracticaltre, bookyear1921
