Abstract
Aim: The aim of this work was to measure the degree of distillation of the upper first molars using the Carriere motion appliance (CMA). Then there were changes resulting from the use of the CMA apparatus with regard to distorotation, intermolar width, dental discrepancy, bite depth and incisal step.
Material and methods: The study included a total of 38 patients treated with CMA (25 women and 13 men) aged 12 to 17 years. Measurements were performed on cephalometric images (n = 20) and intraoral scans (n = 15) at the time before treatment (T1) And after CMA removal before follow-up orthodontic therapy (T2).
The treatment lasted an average of 5.2 +- 1.5 months. On cephalometric images 19 parameters were evaluated, 8 parameters on intraoral scans.
Results: A significant distal shift was recorded on the interbuccal and palatal humps of the upper first molars, on the interstibular hump by an average of 3.11 mm on the right and 2.82 mm on the left, on the interpalate bump on an average of 3.56 mm on the right and 2.08 mm on the left. Molar distorotation of 6.17 ° on the right and 6.75 ° on the left was recorded.
During the use of CMA, the dental discrepancy decreased by an average of 5.4 mm in the upper jaw, while the dental discrepancy increased by an average of 1.1 mm in the lower jaw. The intermolar width decreased by an average of 0.47 mm.
A significant increase in bite (2.47 mm for scans and 2.3 mm for cephalometric images) and a decrease in the incisal step (1.9 mm for scans and 2 mm for cephalometric images) were confirmed. A significant increase in the size of the lower incisor angle by an average of 6.9 ° was demonstrated.
The change in the inclination of the upper incisors was not statistically significant. Conclusion: Distillation and derotation of molars is possible with CMA, it may be one of the treatment options for Angle II. class.
However, the undesirable effect of its use is to increase the dental discrepancy in the lower jaw and to increase the inclination of the lower incisors.