The Dental cosmos . erating thenatural depressions. If a filling so placed is well burnished andany ragged edges trimmed off, the form of the margin need givelittle concern, since it is entirely covered. Overlapping in masticatingsurfaces is not objectionable, because, whilst the gold may spread out,here as elsewhere, it is in such a position that all the force exertedsimply presses it more tightly against the tooth-substance which it isintended to cover and protect. (To be continued.) Forcible Protrusion of Non- or Partially-Erupted Teeth. BY EDWARD H. ANGLE, , MINNEAPOLIS, MINN. The pa
The Dental cosmos . erating thenatural depressions. If a filling so placed is well burnished andany ragged edges trimmed off, the form of the margin need givelittle concern, since it is entirely covered. Overlapping in masticatingsurfaces is not objectionable, because, whilst the gold may spread out,here as elsewhere, it is in such a position that all the force exertedsimply presses it more tightly against the tooth-substance which it isintended to cover and protect. (To be continued.) Forcible Protrusion of Non- or Partially-Erupted Teeth. BY EDWARD H. ANGLE, , MINNEAPOLIS, MINN. The partial or complete failure of a tooth to erupt frequently neces-sitates the employment of a corrective appliance. In dental literaturea number of appliances are put on record as accomplishing the forcibleprotrusion of teeth, the power being derived from screws, springs, orligatures. All of these devices are similar in that they are anchoredby means of plates, cribs, or clasps attached to the same arch Fig. 1. Fig. which contains the malposed teeth ; while the appliance here shownderives its anchorage by being attached to teeth in the opposite jaw,all plates, cribs, springs, etc., being discarded, thereby renderingthe appliance simpler, more compact and cleanly, besides making itfar more agreeable to the patient, without in any degree lessening itsefficiency. Fig. i shows the principle of this device as applied in the treatment 744 THE DENTAL COSMOS. of a very common form of irregularity, in which the temporary cuspidhad been retained too long, causing the permanent cuspid to eruj tforward of and above its proper place. In this instance the temporarycuspid was extracted and the lower second bicuspid was encircled bya clamp-band, to which had been soldered a short pin with smooth,round head. (See Fig. 2.) A very small hole was drilled into the cuspid and a short pin wasset with thin cement. A common pin answers the purpose very well,and the hole need not be any deeper than the
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