Page 58 - REMOVABLE ORTHODONTIC APPLIANCES

50 Removable Orthodontic Appliances
Figure 7.3 An appliance to open space for
partially erupted upper central incisors for
example following supernumerary removal.
Clasps 6|6 (0.7 mm) and clasps on D|D
(0.6 mm), palatal finger springs on 2|2.

Points to note buccally placed and a buccal canine retractor
It is often necessary to extract the upper decid- must often be used. This spring has the advan-
uous canines to make space, extraction of tage of being able to move the canine palatally
premolars may later be necessary. as well as distally. It can, however, easily apply
excessive force with resulting unfavourable
anchorage loss.
Distal movement of canines
An appliance to retract canines (Figure 7.4)
This is a very common tooth movement in class
I and class II occlusions. In class II it is usually Active component
necessary to retract canines to provide space Self-supported buccal canine retractors 0.5 mm
for overjet reduction and a palatal cantilever spring supported in tubing with 0.5 mm internal"
spring is the first choice. The apphance is diameter.
described in Chapter 8.
In class I occlusions the main problem is one Baseplate
of crowding. The upper canines are usually Normal full coverage.

Figure 7.4 An appliance to align buccal
canines. Self-supported buccal canine
retractors (0.5 mm) sheathed in tubing
(0.5 mm ID). Adams' clasps on 6|6.
Southend clasp 1|1 (0.7 mm).