A comparison of the effects of rapid maxillary expansion and
fan-type rapid maxillary expansion on dentofacial structures.
Doruk C, Bicakci AA, Basciftci FA, Agar U, Babacan H.
Department of Orthodontics, Faculty of Dentistry, Cumhuriyet University,
Sivas, Turkey.
The aim of this study was to evaluate and compare the sagittal,
transverse, and vertical effects of rapid maxillary expansion
(RME) and fan-type RME on dentofacial structures. The study group
consisted of 34 patients, 14 boys and 20 girls (average age 12.5
years), selected without considering their skeletal class and
sex. The fan-type RME group comprised 17 subjects, who had an
anterior constricted maxilla with a normal intermolar width. The
RME group comprised 17 other subjects, who had a maxillary transverse
discrepancy with a posterior crossbite. The records obtained for
each patient included a lateral and a frontal cephalometric film,
upper plaster models, and occlusal radiograph obtained before
treatment (T1), after expansion (T2), and immediately after a
three-month retention period (T3). The data obtained from the
evaluation of the records before and after treatment, after treatment
and after retention, and before treatment and after retention
were compared using paired t-test. Further comparisons between
the groups were made using Student's t-test. There was significantly
greater expansion in the intercanine than in the intermolar width
in the fan-type RME group as compared with the RME group. Downward
and forward movement of the maxilla was observed in both groups.
The upper incisors were tipped palatally in the RME group, but
they were tipped labially in the fan-type RME group. There was
significantly greater expansion in the nasal cavity and maxillary
width in the RME group as opposed to the fan-type RME group.
Publication Types:
· Clinical
Trial
· Controlled
Clinical Trial
PMID: 15132444 [PubMed - indexed for MEDLINE]
