A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . he selection of plaster, employ the kind that will give a hard, smooth,strong model. To avoid air bubbles, pour off the surplus water from the bowl at the CHAPTER III. TECENIC CONSTRUCTION OF VELUM-OBTURATOR 449 moment the last particles of plaster are sinking beneath the surface. After quickly-mixing, the remaining air bubbles are removed by a rotary movement of the bowl,causing plaster to float upon the sides of the bowl, and by occasionally jogging itupon the bench. This proc
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . he selection of plaster, employ the kind that will give a hard, smooth,strong model. To avoid air bubbles, pour off the surplus water from the bowl at the CHAPTER III. TECENIC CONSTRUCTION OF VELUM-OBTURATOR 449 moment the last particles of plaster are sinking beneath the surface. After quickly-mixing, the remaining air bubbles are removed by a rotary movement of the bowl,causing plaster to float upon the sides of the bowl, and by occasionally jogging itupon the bench. This procedure should be followed in pouring all the plaster andinvestment models in the flask. Hold the impression in one hand and pour theplaster from the bowl held in the other, commencing in front, and causing it toflow back on each side of the cleft, shaking it into another bowl. Repeat this severaltimes, until the required surfaces are covered. Then with the spatula, build it tothe desired thickness, height, and width. This should leave the upper part of thenasal and posterior portions uncovered. Fig. 19. Fig.
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