Page 37 - REMOVABLE ORTHODONTIC APPLIANCES

Active components 29
engage with an elastic and may be better References
brought into the arch with full fixed appli-
ances. Haynes, S., Jackson, D. (1962) A comparison of the mech-
Elastics have been used to carry out the anism and efficiency of twenty-one orthodontic expan-
sion screws. Dental Practitioner, 13; 125-133
retraction of incisors. A latex elastic is
Houston, W.J.B., Waters. N.E. (1977) The design of buccal
stretched between hooks placed distal to the canine retraction springs for removable orthodontic
canines and provides an inconspicuous appliances. British Journal of Orthodontics. 4: 191-195
method of retracting incisors. A serious
drawback is that the elastic is liable to slide
up the teeth and traumatize the gingivae.
This can be prevented by bonding a plastic Further reading
bracket to the labial surface of a central Houston. W.J.B.. Waters. N.E.. Farrant. S.D. (1972) High
incisor but, because elastics also tend to flat- tensile wires and removable appliances. British Journal
ten the arch, they are generally better of Orthodontics, 1: 33-36
avoided for overjet reduction with removable Muir, J.D. (1971) Anterior retention in the removable
appliances. appliance. Transactions of the BSSO. 57: 178-184