American Journal of Orthodontics and Dentofacial Orthopedics
Original articlePeriodontal effects of rapid maxillary expansion with tooth-tissue-borne and tooth-borne expanders: A computed tomography evaluation
Section snippets
Material and methods
Our study sample (n = 8) was selected from a larger group of 87 young subjects with Angle Class I or Class II malocclusions with unilateral or bilateral posterior crossbites who sought orthodontic treatment at the Department of Orthodontics, Bauru Dental School, University of São Paulo. The exclusion criteria were (1) age below 11 and above 14 years, (2) persistence of any deciduous teeth, (3) absence of maxillary posterior permanent teeth, (4) metallic restorations on maxillary posterior
Results
No variable had a statistically significant systematic error. The casual errors ranged from 0.09 to 0.20.
Evaluation of the pooled groups showed that RME reduced the BBPT of the supporting teeth by 0.6 to 0.9 mm (Table I). The Haas-type (Table II) and hyrax (Table III) expanders showed the same results, reducing alveolar bone thickness on the buccal aspect of the banded teeth, whereas the bone plate of adjacent teeth—canines and second premolars—remained almost unchanged. Therefore, there were
Discussion
The use of a small sample in this study was justified by ethical considerations, which limit radiation exposure for research purposes. CT images are not part of routine orthodontic records, and the ethics committee approved the project only because CT scanning can provide RME information not obtainable from other methods, mainly the periodontal findings. To overcome the small study sample, patient age and sex were homogenized, and all subjects were carefully treated and controlled by the same
Conclusions
- 1
RME orthodontic effect reduced the BBPT of maxillary posterior teeth and increased the LBPT.
- 2
The tooth-tissue-borne expander caused less of an increase to the LBPT of the maxillary posterior teeth than did the tooth-borne expander.
- 3
RME induced bone dehiscences on the anchorage teeth’s buccal aspect, especially in subjects with thinner buccal bone plates.
- 4
The tooth-borne expander produced more reduction of first premolar BACL than did the tooth-tissue-borne expander.
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Based on research by Dr Daniela G. Garib in partial fulfillment of the requirements for the PhD degree in orthodontics at Bauru Dental School, University of São Paulo.