The Expansion ‘W’ and its Modification in Orthodontic Treatment

Abstract

A quad helix expansion device is described and modifications shown which increase its range of action.

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Chaconas

S. J.

and Caputo

A. A.

(1975) Observations of orthopaedic force distribution utilising maxillary orthodontic appliances. Abstracted in Journal of Dental Research, 54, 45.

Ricketts

R. M.

(1973) Features of Bioprogressive Therapy, pp. 33–36, Denver: Rocky Mountain Orthodontic Publications.