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Over the last century, material science has made rapid progress. This has been evident in our day to day lives also. And Orthodontics, particularly, has benefited largely from this. In this branch of dentistry, not only have the materials been improved, but also the philosophies have changed. This book describes how the appliance philosophies and material science progress is closely interrelated. All these wire alloys that were introduced and the latest ones have some very individualistic and unique properties associated with them. So in order to use the modern wires, it is important to know as why they behave this way i.e., their properties.It can be seen that there is no archwire meets all the requirements of the orthodontist. We still have a long way to go, in terms of finding the 'ideal' archwire. But, with such rapid progress being made in science and technology, I am sure that we will see significant improvements in archwires in the near future.