A comparison between friction and frictionless mechanics with a new typodont simulation system.
This study was designed to explore the differences between friction and frictionless mechanics for maxillary canine retraction with the use of a new typodont simulation system, the Calorific machine system. The unit was designed to observe the whole process of tooth movement and is composed of 3 parts: a temperature regulating system, electrothermodynamic teeth, and an artificial alveolar bone component. The efficiency of maxillary canine retraction was compared with the sliding mechanics (along a.016 x.022-in stainless steel labial arch and nickel-titanium closed coil spring) and a canine retraction spring. The patterns of tooth movement obtained with both of these mechanics were measured 5 times each. Friction mechanics were superior to frictionless mechanics in terms of rotational control and dimensional maintenance of the arch (P <.0001); frictionless mechanics were shown to be more effective at reducing tipping and extrusion (P <.0001). However, the observed differences between the 2 methods were relatively small in terms of their clinical significance, and no differences were found in anchorage control (P =.2078). In conclusion, this study indicated that friction and frictionless mechanics perform similarly.
Department of Orthodontics, Medical College, Ewha Womans University Hospital, 70 Chongno 6-ka, Chongno-ku, Seoul, Korea 110-126.
J N
JN
Rhee
Y S
YS
Chun
J
J
Row
D000539:Alveolar Process / Q000033:anatomy & histology; D001641:Bicuspid / Q000502:physiology; D001701:Bionics; D003481:Cuspid / Q000502:physiology*; D003722:Dental Alloys; D004581:Electronics; D017276:Friction; D006801:Humans; D008437:Maxilla; D019563:Mechanics; D008953:Models, Anatomic; D008954:Models, Biological; D008963:Molar / Q000502:physiology; D009532:Nickel; D016910:Orthodontic Brackets; D009969:Orthodontic Wires; D012399:Rotation; D013193:Stainless Steel; D013696:Temperature; D013816:Thermodynamics; D014025:Titanium; D014087:Tooth Movement Techniques / Q000295:instrumentation / Q000379:methods*
D003722:Dental Alloys; C040654:titanium nickelide; D013193:Stainless Steel; D009532:Nickel; D014025:Titanium