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Original Article

Korean J Orthod 2008; 38(1): 31-40

Published online February 28, 2008 https://doi.org/10.4041/kjod.2008.38.1.31

Copyright © The Korean Association of Orthodontists.

Treatment and posttreatment changes following intrusion of maxillary posterior teeth with miniscrew implants for open bite correction

Han-ah Lee, DDS, MSD, a and Young-chel Park, DDS, MSD, PhDb

aResident, Department of Orthodontics, college of Dentistry, Yonsei University, Seoul, Korea.
bProfessor, Department of Orthodontics, college of Dentistry, Yonsei University, Seoul, Korea.

Correspondence to: Young-chel Park. Department of Orthodontics, College of Dentistry, Yonsei University, Shinchon-dong 134, Seodaemun-Gu, Seoul, 120-752, Korea. +82 02 2228 3000, Email: ypark@yuhs.ac.

Received: August 29, 2007; Revised: November 29, 2007; Accepted: December 1, 2007

Abstract

Objective

This study investigated the skeletal and dentoalveolar changes after intrusion of maxillary posterior teeth using miniscrew implants during the treatment and posttreatment period.

Method

The subjects consisted of 11 adults (1 male, 10 females) whose open bites were treated by posterior teeth intrusion with miniscrew. The lateral cephalometric x-rays of pre-treatment, post-treatment, and the retention period were evaluated.

Results

The average intrusion of maxillary posterior teeth at the end of the treatment period was 2.22 mm (p < 0.001) and the average extrusion of maxillary posterior teeth at the end of the 17.4 month retention period was 0.23 mm (p = 0.359). The relapse rate was calculated at 10.36%. A decrease in overbite after the 17.4 month retention period was 0.99 mm (p < 0.05). The relapse rate was calculated at 18.10%. The skeletal changes and vertical height change of maxillary posterior teeth during the retention period was statistically insignificant, but there was a significant decrease in overbite (mean 0.99 mm, p < 0.05). The amount of intrusion and the overbite improvement from treatment significantly correlates to the degree of relapse.

Conclusions

The results indicate that intrusion of the maxillary posterior teeth using miniscrews is an effective, non-surgical treatment modality which can reasonably be used to address adult open bite.

Keywords: Intrusion of maxillary posterior teeth, Open-bite, Miniscrew implant, Stability