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Am J Orthod Dentofacial Orthop. 2016 Jul;150(1):78-88. doi: 10.1016/j.ajodo.2015.12.014.

Evaluation of long-term stability of skeletal anterior open bite correction in adults treated with maxillary posterior segment intrusion using zygomatic miniplates.

Author information

1
Lecturer, Faculty of Dentistry, Department of Orthodontics, Alexandria University, Alexandria, Egypt. Electronic address: eiman.marzouk@yahoo.com.
2
Lecturer, Faculty of Dentistry, Department of Orthodontics, Alexandria University, Alexandria, Egypt.

Abstract

INTRODUCTION:

This study evaluated the long-term stability of maxillary molar intrusion and anterior open-bite correction in adults treated by maxillary posterior teeth intrusion with zygomatic miniplates.

METHODS:

The sample included 26 skeletal anterior open-bite patients, who had maxillary posterior segment intrusion with zygomatic miniplates. Lateral cephalograms were taken at pretreatment, posttreatment, 1 year posttreatment, and 4 years posttreatment.

RESULTS:

The mean maxillary molar intrusion was 3.04 mm (P ≤0.01), and the mean bite closure was 6.93 mm (P ≤0.01). The intruded maxillary molars relapsed by 10.20% in the first year after treatment and by 13.37% by 4 years after treatment. Overbite relapsed by 8.19% and 11.18% after 1 year and 4 years posttreatment, respectively. The first year after treatment accounted for 76.29% and 73.2% of the total relapses of molar intrusion and overbite, respectively. The 4-year posttreatment relapse amounts of maxillary molar intrusion and overbite were positively correlated with the amount of pretreatment maxillary molar height and the initial open-bite severity, respectively, but negatively correlated with the amounts of maxillary molar intrusion and open-bite correction gained by treatment.

CONCLUSIONS:

Molar intrusion with zygomatic miniplates appears to be stable 4 years after treatment.

PMID:
27364209
DOI:
10.1016/j.ajodo.2015.12.014
[Indexed for MEDLINE]

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