T simple stabilizing jigs for bonded lingual retainer wires are easily fabricated from materials in the office, using the following procedure: 1. Bend a circular retentive tag into one end of an .031" stainless steel wire segment.* 2. Double-wind the wire 6-8mm from the tag to form a helix with an internal diameter of 3mm (A). 3. Bend the other end of the wire 90°, leaving a space of about 2mm ...

Discharge valve is very critical component in rotary compressor, and it is a reed valve which consists of valve seat, valve slice and retainer. The motion characteristics of valve slice greatly influence the flowing loss and life of valve. The paper presents a mathematical model to simulate thermodynamic process and motion of the valve simultaneously. Based on the thin-plate theory, the finite ...

This study was made to clarify the retentive force of a denture retainer, i.e., a cone-type stud and sleeve attachment. In order to measure the wearing effect, an engaging and disengaging cycle test of 1,000 times was performed. The effects of taper angle (cone angle), sleeve height and thrusting force at engaging stud and sleeve on retentive force were also analyzed. 1. The cycle test had litt...

R. Scott Hawley is an Investigator at the Stowers Institute for Medical Research in Kansas City and a Professor of Molecular Biosciences at the University of Kansas. He is best known for his studies of meiotic chromosome behaviour in Drosophila females. Indeed, an anonymous reviewer of one of his research proposals once claimed that Hawley “had elevated the genetic analysis of meiosis in Drosop...

The present study was performed to test the tendency for plaque and calculus build-up along the wire of different types of bonded orthodontic canine-to-canine retainers, whether the presence of such retainers causes any damage to the teeth involved, the failure rate of the retainers, and any changes in incisor alignment during a 3-year period of retention. The four test groups received either r...

JCO/FEBRUARY 2004 H retainers with Adams clasps or labial wires crossing the occlusion can create interferences that may lead to bruxism or disc displacement1-3 (Fig. 1). On the other hand, if a wraparound retainer is fabricated without crossover clasps, it is difficult to adapt the round wire closely enough to the anterior dentition to provide adequate mechanical retention, especially in patie...