The Dental cosmos . fect adaptation if the model has not beeninjured by handling. An additional spring can be added at any time. A narrow strip of tinned copper or taggers tin is used in prefer-ence to the binding wire formerly described for winding the joints inuniting springs, etc. The strip is wound about the parts in the samemanner as the binding wire, and the solder flows over it more wire gauze and perforated tin have been used to advantage. About three years ago it was observed that when copper was usedin small quantity, as binding wire and other forms in appliances thatwe
The Dental cosmos . fect adaptation if the model has not beeninjured by handling. An additional spring can be added at any time. A narrow strip of tinned copper or taggers tin is used in prefer-ence to the binding wire formerly described for winding the joints inuniting springs, etc. The strip is wound about the parts in the samemanner as the binding wire, and the solder flows over it more wire gauze and perforated tin have been used to advantage. About three years ago it was observed that when copper was usedin small quantity, as binding wire and other forms in appliances thatwere retained for long periods of time in contact with the teeth forregulating and retaining them, there appeared to be no consequentinjury in the way of structural tooth-changes or decomposition of food-particles underneath the fixture. The subsequently continuous use ofcopper has tended to prove its detersive properties in this connection. At a public clinic recently, while the writer was relating the advan- Fig. METHODS OF REGULATING TEETH. 107 I tages of using copper for similar purposes in the mouth, Dr. WalterS. Elliott, of Sag Harbor, N. Y., came forward and exhibited a rub-ber plate that he was wearing, that had copper covering the portionsof the rubber that came in contact with the natural teeth. The teethhad formerly been extremely sensitive, but he now suffers no incon-venience. No injurious effects have as yet in any case been experi-enced from its use. The common and reckless extraction of temporary and permanentteeth to relieve crowding should be discouraged, and in preference,when necessary, an appliance be made for spreading either the supe-rior or inferior arch. If there is insufficient room for the free eruption of the permanentteeth, it is best to begin to expand the arch, if necessary, when theincisors are erupting, an operation easily accomplished by means ofthe crib appliances. Correcting the position of irregular inferior incisors will often cor-rect th
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