الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
 |  | from | 269 |  |  |
| | | from | 269 | | |
Abstract
Objective: The current study was a Randomized Controlled Trial (RCT) that was
performed to investigate three-dimensionally the effect of posterior cross-bite
correction using Quad-helix appliance on the TMJ as compared with untreated
matched control subjects.
Material and Methods: Sample size calculation was carried out and resulted in
enrollment of 26 subjects in the study. The selected subjects had the criteria of
unilateral posterior cross-bite that require maxillary expansion as a part of their
individual treatment plan. The age of subjects ranged between 9 to 13 years with
skeletal maturation stage range between CS1 and CS3. The subjects were
randomly allocated to two groups; Group1 who received maxillary expansion and
group 2 who considered as control with no treatment for 6 months.
Results: Anteroposterior condylar asymmetry was decreased after correction of
posterior cross-bite by posterior displacement of the non-crossbite condyle and
anterior displacement of the cross-bite condyles. A more centralized position of
the condyles in the joint cavities was achieved after expansion as evident by
increased AJS and decreased PJS in the non-crossbite side with concomitant
decreased AJS and increased PJS in the cross-bite side.
Conclusion: Correction of unilateral posterior cross-bite by Quad-helix appliance
yielded favorable TMJ changes over the untreated controls and was successful in
reducing the anteroposterior condylar and joint spaces asymmetries.