Noncompliance unilateral maxillary molar distalization:.
The aim of this prospective study was the three-dimensional (3-D) analysis of tooth movements after unilateral upper molar distalization by means of a noncompliance intraoral appliance, the Keles slider. This appliance exerts a distalizing force of 150 g at approximately the level of the center of resistance of the upper first molar. Twelve patients (six girls and six boys with a mean age of 13.1 years) with a unilateral Class II molar relationship participated in the study. Dental casts were taken immediately before placement and after removal of the appliance. The casts were digitized using a 3-D surface laser scanner and superimposed on a predefined area of the palate. The average unilateral upper first molar distal movement was 3.1 mm (range: 2.4 to 5.3 mm). Anchorage loss was expressed by a 2.1 mm (range: 0.8 to 3.8 mm) proclination of the central incisors and a 6.1 degrees mesial inclination of the ipsilateral first premolar (range: 1.7 degrees to 12.3 degrees ). There was approximately 1 mm of midline deviation toward the contralateral side and a 1.6 mm (range: 0.8 to 2.3 mm) buccal displacement of the contralateral first premolar. A substantial variation was observed among patients. Noncompliance unilateral upper molar distalization was an efficient treatment approach. There was, however, a substantial anchorage loss. Case selection is strongly recommended because significant anterior crowding, ectopic canines, or spacing can lead to significant anchorage loss.
Mavropoulos
Anestis
A
Department of Orthodontics, University of Geneva, Barthelemy-Menn 19 Geneva, Geneva 1205, Switzerland. anestis.mavropoulos@medecine.unige.ch
Sayinsu
Korkmaz
K
Allaf
Ferdi
F
Kiliaridis
Stavros
S
Papadopoulos
Moschos A
MA
Keles
Ahmet Ozlem
AO
D000293:Adolescent; D001641:Bicuspid / Q000473:pathology; D003481:Cuspid / Q000473:pathology; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D021621:Imaging, Three-Dimensional / Q000379:methods*; D007180:Incisor / Q000473:pathology; D007834:Lasers; D008297:Male; D008312:Malocclusion, Angle Class II / Q000628:therapy; D008437:Maxilla; D003765:Models, Dental; D008963:Molar / Q000473:pathology*; D052280:Orthodontic Anchorage Procedures; D016382:Orthodontic Appliance Design; D011446:Prospective Studies; D014087:Tooth Movement Techniques / Q000295:instrumentation / Q000379:methods*