Principles and practice of operative dentistry . Dental screw. The dental screw (Fig. 670) is also a valuable instrument for tneremoval of very frail roots in which caries has followed the pulp-canaland converted the root into a mere shell. This instrument is applied byscrewing it into the cavity in the root until the thread takes a firm holdupon the dentin, when the root is easily lifted from its alveolus. Fig. Fig. 672.

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdentist, bookyear1920