Jn. Rhee et al., A comparison between friction and frictionless mechanics with a new typodont simulation system, AM J ORTHOD, 119(3), 2001, pp. 292-299
Citations number
43
Categorie Soggetti
Dentistry/Oral Surgery & Medicine
Journal title
AMERICAN JOURNAL OF ORTHODONTICS AND DENTOFACIAL ORTHOPEDICS
This study was designed to explore the differences between friction and fri
ctionless mechanics for maxillary canine retraction with the use of a new t
ypodont simulation system, the Calorific machine system. The unit was desig
ned to observe the whole process of tooth movement and is composed of 3 par
ts: a temperature regulating system, electrothermodynamic teeth, and an art
ificial alveolar bone component. The efficiency of maxillary canine retract
ion was compared with the sliding mechanics (along a .016 x .022-in stainle
ss steel labial arch and nickel-titanium closed coil spring) and a canine r
etraction spring. The patterns of tooth movement obtained with both of thes
e mechanics were measured 5 times each. Friction mechanics were superior to
frictionless mechanics in terms of rotational control and dimensional main
tenance of the arch (P < .0001); frictionless mechanics were shown to be mo
re effective at reducing tipping and extrusion (P < .0001). However, the ob
served differences between the 2 methods were relatively small in terms of
their clinical significance, and no differences were found in anchorage con
trol (P = .2078). In conclusion, this study indicated that friction and fri
ctionless mechanics perform similarly.