Introduction
The purpose of this study was to compare the transverse, vertical, and anteroposterior
skeletal and dental changes in adolescents receiving expansion treatment with tooth-borne
and bone-anchored expanders. Immediate and long-term changes were measured on cone-beam
computed tomography (CBCT) images.
Methods
Sixty-two patients needing maxillary expansion were randomly allocated to 1 of 3 groups:
traditional hyrax tooth-borne expander, bone-anchored expander, and control. CBCT
images were taken at baseline, immediately after expansion, after removal of the appliance
(6 months), and just before fixed bonding (12 months). Repeated measures multivariate
analysis of variance (MANOVA) was applied to the distances and angles measured to
determine the statistical significance in the immediate and long time periods. Bonferroni
post-hoc tests were used to identify significant differences between the treatment
groups.
Results
Immediately after expansion, the subjects in the tooth-borne expander group had significantly
more expansion at the crown level of the maxillary first premolars (P = 0.003). Dental crown expansion was greater than apical expansion and skeletal expansion
with both appliances. The control group showed little change (growth) over the 6-month
interval. At 12 months, no group had a statistically significant difference in angle
changes, suggesting symmetric expansion. Both treatment groups had significant long-term
expansion at the level of the maxillary first molar crown and root apex, first premolar
crown and root, alveolus in the first molar and premolar regions, and central incisor
root. Tooth-borne expansion resulted in significantly more long-term expansion at
the maxillary premolar crown and root than did bone-borne expansion.
Conclusions
Both expanders showed similar results. The greatest changes were seen in the transverse
dimension; changes in the vertical and anteroposterior dimensions were negligible.
Dental expansion was also greater than skeletal expansion.
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Article Info
Publication History
Accepted:
September 2009
Received in revised form:
September 2009
Received:
June 2009
Footnotes
The authors report no commerical, proprietary, or financial interest in the products or companies described in this article.
Identification
Copyright
© 2010 American Association of Orthodontists. Published by Elsevier Inc. All rights reserved.
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- Transverse, vertical, and anteroposterior changes from bone-anchored maxillary expansion vs traditional rapid maxillary expansion: A randomized clinical trialAmerican Journal of Orthodontics and Dentofacial OrthopedicsVol. 137Issue 3
