ABSTRACT

Objectives

To determine dentoalveolar and skeletal effects produced in mature patients by the Carriere Motion Class III (CM3) appliance followed by fixed appliances.

Materials and Methods

This retrospective study evaluated 32 patients at three time points: T1 (initial), T2 (removal of CM3), and T3 (posttreatment). Serial cephalograms were traced and digitized, and best-fit regional superimpositions were constructed. Eleven linear and 7 angular variables were measured. The starting forms of the CM3 patients were compared with a sample of untreated subjects with normal occlusions and well-balanced faces.

Results

The CM3 phase lasted 6.3 months, followed by a phase of fixed appliances lasting 12.9 months; the total duration of treatment was 19.2 months. Minimal skeletal changes were measured sagittally, with only a slight increase in lower anterior facial height observed during treatment. Most treatment changes were dentoalveolar in nature. Wits appraisal increased 4.0 mm during treatment. The molar relationship improved by 6.0 mm during phase I, a value that rebounded slightly during phase II, resulting in an improvement toward Class I of 4.8 mm. Best-fit regional superimpositions revealed anterior movement of upper molars relative to the maxilla and posterior movement of lower molars relative to the mandible.

Conclusions

The Carriere Motion Class III appliance is an effective and efficient method of resolving occlusal problems in minimally growing Class III patients. Primary treatment effects are dentoalveolar in nature with minimal skeletal alterations.

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Author notes

a

Thomas M. and Doris Graber Endowed Professor Emeritus, Department of Orthodontics and Pediatric Dentistry, School of Dentistry; Professor Emeritus of Cell and Developmental Biology, School of Medicine; Research Scientist Emeritus, Center for Human Growth and Development, The University of Michigan, Ann Arbor, Mich; and private practice, Ann Arbor, Mich.

b

Associate Professor, Department of Experimental and Clinical Medicine, School of Dentistry, University of Florence, Florence, Italy; and Thomas M. Graber Visiting Scholar, Department of Orthodontics and Pediatric Dentistry, School of Dentistry, The University of Michigan, Ann Arbor, Mich.

c

Clinical Associate Professor, Department of Orthodontics and Pediatric Dentistry, The University of Michigan; and private practice, Ann Arbor, Mich.

d

Research Assistant, School of Dentistry, The University of Michigan, Ann Arbor, Mich.

e

Undergraduate student, The University of Michigan, Ann Arbor, Mich.