Purpose: To investigate the relation between the change of mandibular plane and maxillary molar intrusion with mini-implants. Materials and Methods: Twenty-eight consecutive adult patients with skeletal Class II, retrognathic mandible and high mandibular plane were included (mean age: years). They were treated with 4 premolar extractions and mini-implants for maxillary molar intrusion. The pre-treatment (T0) and post-treatment (T1) lateral cephalograms were traced and superimposed to measure the changes of parameters. Pearson correlation coefficient was calculated to determine the correlation between the molar intrusion and the change of mandibular plane. Results: The upper molars were intruded mm. The lower molars were extruded mm. Pog point moved forward mm and upward mm. The mandibular plane angle reduced. The change of mandibular plane was highly correlated with the maxillary molar intrusion and the net change of maxillary molar and mandibular molar intrusion. Conclusion: Mini-implants provide effective molar intrusion for the improvement of mandibular position. Bimaxillary molar intrusion is necessary to maximize forward and upward rotation of the mandible.

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Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.