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Non extraction short-term arch changes
1Department of Orthodontics, Faculty of Medicine and Dentistry, II University of Naples, Italy. ferrofabrizia@libero.it
Objectives:
to examine the Cetlin protocol for short-term dentoalveolar changes in the sagittal and transversal planes in non-extraction treatment.
Materials And Methods:
eighty patients with Class II, div.1 malocclusion treated with the Cetlin protocol, comprising upper distalizing plate, extraoral traction, and lower lip bumper. Dental study models were examined before treatment and after molar Class II correction during which upper molars were mechanically distalized, distobuccally rotated and expanded.
Results:
the upper arch perimeter increased significantly. The lip bumper produced functional expansion of the lower arch, especially in the transverse plane, with an important increase in the arch perimeter.
Conclusions:
in the short-term, the Cetlin protocol made the following improvements: 1) molar correction, 2) resolution or improvement of crowding, 3) space recovery in both arches for leveling the curve of Spee and final adjustments. Further improvements in intercuspation can be made, if necessary, by fixed appliance therapy.