The influence of preloading on stress relaxation of orthodontic elastic polymers. 1979

J Young, and J L Sandrik

The main objective of the investigation was the determination of whether prestretching would decrease the rapid force loss of the elastic polymers. The results indicated that Alastik CK chains showed a significant decrease in force loss whereas the C2 chains were unaffected. Since overextending the chain to compensate for force loss during clinical placement could result in capillary bed ischemia, increasing the force loss of the CK chains must be done before application. To accomplish this the chains should be prestretched by the manufacturer or operator. An improvement in the material component or manufacturing process would provide a more lasting solution to a material for which orthodontists have found increasing use.

UI MeSH Term Description Entries
D009967 Orthodontic Appliances Devices used for influencing tooth position. Orthodontic appliances may be classified as fixed or removable, active or retaining, and intraoral or extraoral. (Boucher's Clinical Dental Terminology, 4th ed, p19) Appliance, Orthodontic,Appliances, Orthodontic,Orthodontic Appliance
D011108 Polymers Compounds formed by the joining of smaller, usually repeating, units linked by covalent bonds. These compounds often form large macromolecules (e.g., BIOPOLYMERS; PLASTICS). Polymer
D004548 Elasticity Resistance and recovery from distortion of shape.
D006813 Humidity A measure of the amount of WATER VAPOR in the air. Humidities
D012408 Rubber A high-molecular-weight polymeric elastomer derived from the milk juice (LATEX) of HEVEA brasiliensis and other trees and plants. It is a substance that can be stretched at room temperature to at least twice its original length and after releasing the stress, retract rapidly, and recover its original dimensions fully. Latex Rubber,Elastica,India Rubber,Natural Rubber,Plant Rubber,Vulcanite,Natural Rubbers,Plant Rubbers,Rubber, Natural,Rubber, Plant,Rubbers, Natural,Rubbers, Plant
D013314 Stress, Mechanical A purely physical condition which exists within any material because of strain or deformation by external forces or by non-uniform thermal expansion; expressed quantitatively in units of force per unit area. Mechanical Stress,Mechanical Stresses,Stresses, Mechanical
D013718 Tensile Strength The maximum stress a material subjected to a stretching load can withstand without tearing. (McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed, p2001) Strength, Tensile,Strengths, Tensile,Tensile Strengths
D013997 Time Factors Elements of limited time intervals, contributing to particular results or situations. Time Series,Factor, Time,Time Factor

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