Biomedical subjects

R C Parkhouse

Publications and source records attributed to R C Parkhouse.

13 recordsLinked to original sources

PubMed2001

The "Tip-Edge" torquing mechanism: a mathematical validation.

The Tip-Edge (TP Orthodontics, LaPorte, Ind) bracket is unique among orthodontic brackets because it can be used in combination with rectangular archwire to torque teeth, not through activation of the archwire itself but through the action of auxiliary springs that are active in the tip plane. The purpose of this report is to describe the way in which a tipping couple generates a secondary torquing couple and the resulting path traced by the root apex and to express those actions mathematically. The magnitude of forces applied by the auxiliary spring to the tooth apex is calculated on the basis of an experiment.

Adolescent↗

PubMed1998

Rectangular wire and third-order torque: a new perspective.

The Differential Straight Arch technique, more commonly known as "Tip-Edge" (TP Orthodontics Inc.), uses a modified edgewise type bracket to allow differential tooth movement. As bracketed teeth incline toward their finishing positions, the geometry of the arch wire slot causes the vertical slot dimension available to the arch wire to increase. Advantage has been taken of this facility, to evolve an entirely new torquing system for final finishing, during the root correction phase. Instead of increasing rectangular arch wire size to fit the arch wire slot, as with conventional edgewise brackets, the Tip-Edge method reduces the vertical arch wire slot dimension to achieve a precise, three-dimensional relationship to a full-sized rectangular arch wire. The active component is provided by auxiliary springs. The method, which awaits mathematical analysis, is described and illustrated with two case reports.

Adolescent↗

PubMed1995

Further thoughts on the sugar dust caries.

Explore the source record for details and available documents.

Dental Caries↗

PubMed1992

Differential tooth movement in "uphill cases".

The continuing relevance of the light-wire appliance is illustrated by the treatment of three cases, with emphasis on the beneficial effect of Class II intermaxillary traction the vertical dimension in "low-angle" cases.

Activator Appliances↗

PubMed1991

Medical complications in orthodontics.

Three unrelated cases are described in which complications arose or may have arisen as a result of orthodontic treatment; a swallowed segment of an appliance, an unexplained instance of sarcoid and a patient with chronic juvenile polyarthritis.

Adolescent↗

PubMed1988