Metal retainers, whether removable Hawley retainers or fixed bonded lingual wires, are designed to last for years. Fixed bonded metal wires typically stay attached behind front teeth for five to ten years before requiring composite repair or re-bonding.
The retention of teeth after they have been moved into the desired line of occlusion is an essential part of the operation. Unless firmly held in position for a sufficient length of time, the teeth will return to their original malpositions. The new bone which is deposited during tooth movement is at first spongy and unstable, requiring many months to become fully calcified.
The fibres of the pericementum and the surrounding gum tissue possess great elasticity, exerting a continuous traction upon the roots until complete physiological adaptation has taken place. Retaining devices must therefore be worn until all tendency to relapse has ceased.
The expansion arch, as designed in early treatises, consisted of an elastic spring wire bent to conform to the ideal shape of the dental arch. It was supported by anchor bands cemented upon the first permanent molars and provided with horizontal tubes through which the threaded ends of the arch passed. By means of adjusting nuts situated in front of the tubes, the arch was advanced or retracted, while its spring temper exerted an outward force upon the irregular teeth through the medium of wire ligatures.
At YOR Dental in MediaCityUK, our team checks bonded retainer wires during routine cleanings. Clinical consultations at Salford Quays start from 1,800 Pounds.
The insights shared in our articles are meant to educate and inform, not to replace a face to face consultation. Every smile is unique, and a proper diagnosis can only be made by a qualified clinical professional. Please book an appointment with our team or consult your local dentist for advice tailored to your specific oral health needs.
