. Orthodontia, or malposition of the human teeth; its prevention and remedy . ice for general use. Prof. Angle, in describing hismethod, says :— Fig. 31 shows the simple appliances from which all thevarious combinations used in the original method may bemade. A is a large traction screw encased in its accom-j)anying tube, and used for pulling where the resistance isgreat. B is a smaller traction screw, used in the sameway where the resistance is slight, or where from any reasona delicate appliance is desired. C and D are tubeswhich are soldered to bands placed upon the teeth to bemoved, into w
. Orthodontia, or malposition of the human teeth; its prevention and remedy . ice for general use. Prof. Angle, in describing hismethod, says :— Fig. 31 shows the simple appliances from which all thevarious combinations used in the original method may bemade. A is a large traction screw encased in its accom-j)anying tube, and used for pulling where the resistance isgreat. B is a smaller traction screw, used in the sameway where the resistance is slight, or where from any reasona delicate appliance is desired. C and D are tubeswhich are soldered to bands placed upon the teeth to bemoved, into which the ends of the traction screws arehooked. J is a jack-screw, used for pushing, the end ofwhich is beaten flat. E is an extra piece of tubing, bymeans of which a longer jack-screw can be made. F and H are coils of band material of different thicknesses. G is a gold wire used in retaining the teeth and also to assist MATERIALS AND METHODS. 101 in securing anchorage in some cases, and RR are smallretaining tubes, into which the retaining wire accurately fits, Fig. Angles Appliances. and are designed to be soldered to bands. LL are piano-wire levers of varying sizes, giving different degrees ofpower. Aside from the advantages of simiDlicity, efficiency andcleanliness, which are insured by these ai3j)liances, a stillgreater desideratum is gained by means of the mechanicalprinciples observed in their construction. Stationary an-chorage and non-relinquishment of pressure are prominentfeatures of this method, and are certainly secured almost toperfection, The means by which one or more teeth are held perfectlystationary, while serving as ananchorage or base of, resistance forthe application of force is quitesimple and peculiar to this method. One or more teeth are banded,as shown in Fig. 32. Soldered tothe bands is a tube of some length. stationary Anchorage. (Angle) rni i ji • , i ••-,?,„ Through this tube a rigid shaft,threaded at one end and bent to a right angl
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