Basic and patient-oriented researchCloser Look at the Stability of Surgically Assisted Rapid Palatal Expansion
Section snippets
Patients and Methods
Twenty patients aged between 15 and 54 years, participating in a prospective, observational study of SARPE outcomes approved by the Laval University Ethics Committee, received dental casts and P-A cephalograms before SARPE (time-point [T] 1), at the completion of expansion (T2), at the removal of the expander approximately 6 months later (T3), before any second surgical phase (T4), and at the end of orthodontic treatment (T5). All had a transverse discrepancy of 5 mm or more, and were beyond
Results
Changes during expansion (T1 to T3), changes after expansion (T3 to T5), and net expansion (T1 to T5) are shown in Figure 2. All changes were significantly different from zero (P < .001), except those for the lower molar (not significant). Note that the amount of expansion at the molars was very similar to the expansion at the first premolar (P = .95). This shows the parallelism of the expansion of the posterior teeth.
The amount of skeletal expansion with SARPE and its stability are shown in
Comparison to Other Studies of SARPE
The mean expansion at the first molar observed in the SARPE group was similar to that in previous studies using a comparable research design. The 30% relapse is less than the 36% relapse reported by Byloff and Mossaz.6 Post-treatment retention is likely to be an important factor in any study of stability.15 In our study, the expander was left in place for 6 months (standard deviation, 5.98 ± 0.72 months) after the expansion had stopped, whereas Byloff and Mossaz6 left the distractor in for 3
Acknowledgments
We thank Jean-Paul Goulet, DDS, MSD, FRCD(C), and André Fournier, DMD, for their direction and co-direction of this Master's Degree project, Dany Morais, DMD, FRCD(C), Oral and Maxillofacial Surgeon, for careful surgical treatment, and Gaetan Daigle, PStat, for statistical consultation and statistical analysis. This project was supported in part by grant DE-05221 from the National Institute of Dental and Craniofacial Research of the National Institutes of Health (Bethesda, MD).
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