Fracture of polycarbonate brackets--a related photoelastic stress analysis.
In clinical use polycarbonate edgewise bracket designs, patterned on metallic predecessors, have demonstrated slot-wing fracture. A preliminary two-dimensional photoelastic stress investigation is described in which two bracket designs, without angles in the edgewise slot component, are subjected to simulated palatal root torque mechanics.
Aird
J C
JC
Area Orthodontic Service, Dumfries, Royal Infirmary.
Millett
D T
DT
Sharples
K
K
D003799:Dental Stress Analysis; D004548:Elasticity; D004867:Equipment Design; D004868:Equipment Failure; D008962:Models, Theoretical; D009967:Orthodontic Appliances; D011108:Polymers; D013314:Stress, Mechanical
D011108:Polymers; C017902:lexan