Dr Richard P McLaughlin, Dr John C Bennett and Dr Hugo Trevisi presented their own prescription after gaining around 20 years of clinical experience with the straight wire appliance. They used the Andrews standard values and changed them from a clinical point of view, especially with regard to the torque. Their philosophy reflects a highly systematic approach and is based on a comprehensive system of brackets, exact requirements for positioning the brackets on the teeth, various arch shapes and the use of gentle, constant forces.


Starting from Lawrence F Andrews’ launch of the straight wire appliance in the 1970s with torque, tip and in/out values programmed in the slot and base, it has been modified time and time again. Dr Ronald H Roth presented the bracket values defined according to his philosophy soon after. The Roth prescription reflects the view that a malocclusion should be corrected in line with an efficient occlusion. Aspects such as facial and dental aesthetics, functional occlusion and mandibular joint position, plus stability and periodontal health, should be included in the diagnosis in this regard.