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Some facts concerning the open coil spring

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      Abstract

      A review of the literature concerning coil springs reveals various criteria for selection and use of coil springs in orthodontics. For example, it is emphasized that the amount of force to be used cannot be set arbitrarily, but must be governed by the firmness and sensitivity of the teeth, while, on the other hand, one operator recommends a coil Math Eq inch long adjusted or compressed Math Eq inch on all patients.
      A systematic tabulation of data in conventional units is presented, showing the relationship in coil springs between spring diameter, wire diameter, core diameter, amount of compression, and pressure developed.
      A method of forming and adjusting coil springs is described wherein spring wire is wrapped around a core of a selected size and stretched to twice its length, one end of the spring being placed against a bracket or stop on the arch wire, and the other end being bent in such a fashion as to be readily accessible for subsequent movement to adjust the spring compression.
      Literature is reviewed which indicates the desirability of applying a mild continuous corrective force to the tooth under treatment, the data herein showing that such force can be ideally provided by an elongated coil spring.
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