Space closure and sliding mechanics

Introduction - the need for efficient space closure 250

Methods of space closure 252 Closing loop archwires 252 Sliding mechanics with heavy (ex-edgewise) forces 252

Elastic chain 254

Sliding mechanics with light forces 254 Alternative mechanics for spaces resistant to closure 258

Obstacles to space closure 259

Anchorage balance during space closure 260

Reciprocal space closure 260

Space closure in maximum anchorage cases -

crowding 260

Space closure in maximum anchorage cases -protrusion 261

Space closure in minimum anchorage cases -'burning anchorage' 262

Case NH An adult first premolar extraction case, with a mild Class III skeletal problem 264

Case MOT A first premolar extraction case 272

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