Distalizimi me penudulum në denticionin mix. Efektiviteti i tij
Objective
To evaluate the purpose of the pendulum device used in mixed dentition. The help it gives us for the normal eruption of the permanent fifth teeth as well as the treatment of the second molar class.
Materials and methods
The sample included 24 patients with class II malocclusion (10 boys, 14 girls), their average age was 12.1 years. All patients underwent molar distalization and 2 cephalomeric graphs were taken before distalization (T1) and after distalization (T2). The changes that occurred were calculated taking as reference the sela-nasion line (SN), the palatal plane (PP) and the vertical pterygoid plane. The inclination of OP (occlusion plane) was compared with SN, PP and mandibular plane. The collected data were calculated for all tested variables and the t-test was used to assess the significance of differences between time intervals.
Result
The average total time was 8±2 months to obtain a first class. In the T1-T2 interval, the buccal tip of the incisor was 5°±3.6° (p<0.05), the distal tip on the molar was 8.9°±8.3° (p<0.001) and the tip on the molar the second was 8.2°±8.1° (p<0.001). The maxillary first and second molars were displaced posteriorly with attachment 2.8±3.2 mm (p<0.05) and 3.7±2.7 mm (p<0.001). Only the premolars showed a statistically significant analysis of 2.7±3.3 mm (p<0.05); overjet increased to 1.3±1.2 mm (p<0.05). Regarding OP, none of the tested variables showed such statistical change between T1-T2. After treatment in these patients it was observed that 63.5% of the space was recovered by molar distalization and 36.5% of the space by mesialization of the maxillary first premolars. The pendulum gave us a bilaterally symmetrical dental expansion of approximately 1.1 mm per month.
Conclusion
This distalization device is effective for the distal displacement of the maxillary molars, especially when the permanent teeth have not yet erupted. It brings us an improvement of the molar class in a short time. The OP did not show statistically significant changes after molar distalization.