American Journal of Orthodontics and Dentofacial Orthopedics
Original articleEffects of semirapid maxillary expansion on conductive hearing loss
Section snippets
Material and methods
We studied 19 patients (14 girls, 5 boys) who underwent SRME at the Department of Orthodontics, Faculty of Dentistry, Atatürk University, Erzurum, Turkey. Each patient had severe maxillary width deficiency, bilateral crossbite, and deep palatal vault. Their age range was 12 years to 14 years 9 months (mean, 13 years 5 months ± 1 year).
The design of the acrylic bonded appliance used in this study and its activation program during SRME were described by Iseri and Özsoy.23
The hearing of each
Results
Table I, Table II summarize the mean values and the standard deviations of the pure-tone thresholds and the air-bone gaps at the different speech frequencies for each ear. Means and standard deviations of the tympanometric measurements are shown in Table III. The results of the ANOVA testing the changes at the hearing levels, middle-ear volumes, and static compliance values are summarized in Table IV. The results of the LSD test applied to explain the significances in the ANOVA are given in
Discussion
RME appliances widen the maxillary arch in the transversal direction mainly by separating the maxillary halves by tipping and extrusion of the maxillary posterior teeth.12, 27, 28, 29 Bonded RME appliances with occlusal acrylic coverage seem to have certain advantages, such as greater skeletal expansion, long-term stability, and reduced bite opening than conventional expanders.21, 23 In addition, it has been thought that expanding the maxillary arch slowly is more physiologic and stable.24, 30
Conclusions
- 1
Hearing levels of the patients with conductive hearing loss improved and air-bone gaps decreased at a statistically significant level (P <0.001) during the active expansion period.
- 2
The healing remained stable during the retention and fixed-appliance treatment periods.
- 3
Middle-ear volume increased at a statistically significant level (P <0.001) in all observation periods, except the retention period.
- 4
Slight increases were observed in the static compliance values in all observation periods, but these
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