The Dental cosmos . Thecrown of the superior left cuspid is about one-third erupted, and is io8o THE DENTAL COSMOS. coming inside of the arch, as there is insufficient space for it to eruptin proper line. All of the removed teeth and the superior left first molarhad been extracted by a practitioner who inserted a vulcanite platethat covered the roof of the mouth and extended through the spacemade by the removal of the first molar, to form a clasp around thesecond molar, from which projected a metal point both on the labialand lingual sides of the tooth, for the attachment of four rubber ringsw
The Dental cosmos . Thecrown of the superior left cuspid is about one-third erupted, and is io8o THE DENTAL COSMOS. coming inside of the arch, as there is insufficient space for it to eruptin proper line. All of the removed teeth and the superior left first molarhad been extracted by a practitioner who inserted a vulcanite platethat covered the roof of the mouth and extended through the spacemade by the removal of the first molar, to form a clasp around thesecond molar, from which projected a metal point both on the labialand lingual sides of the tooth, for the attachment of four rubber ringswhich extended forward and were hooked over gold spurs that pro-jected from a gold collar on the first and second bicuspids for thepurpose of drawing them back to make room for the cuspid andlateral incisor. The appliance was well adjusted, but as the molar wasvery short it was not well retained. The patient was referred to the writer, and a crib made in the follow-ing manner was inserted December 20, 1890. Fig. A base wire was formed of No. 17 spring wire to follow the line ofthe lingual side of the teeth, its ends formed into clasps which ex-tended nearly around each of the second molars. A long U-shapedspring was then placed on either side of the left second molar andbicuspids, the ends extending in front of the first bicuspid on eitherside. The two wires were connected in front of the molar by a crosswire having its ends flattened and curved around the two wires, whichwere also wound with fine binding wire, and all soldered with softsolder, using a soldering iron. The inner spring end was shaped to press on the partially eruptedcuspid to force it outward into place. The outer spring end was givena curve against the mesial side of the first bicuspid, the action of whichdrew both bicuspids backward. The appliance was anchored to thesecond molar, and was prevented from moving forward by restingagainst the lingual side of the incisors. (See Fig. 17.) One result is shown in
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