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Comparison of dental arch changes and patients, problems between designed maxillary expansion screw and slow expansion procedures

Morteza Oshagh
Associate Professor, Dept. of Orthodontics, Dental School, Shiraz University of Medical Sciences
Momeni Danaei SH.
Associate Professor, Dept. of Orthodontics, Dental School, Shiraz University of Medical Sciences
Hematiyan MR.  
Associate Professor of Dept. of Mechanical Engineering, Faculty of Engineering, Shiraz University
 Hajian KH.
Dentist, Private Practice
 Shokoohi Z
Dentist, Private Practice


Objective:
One fourth of orthodontic patients can benefit from maxillary expansion but traditional expansion screws produce unfavorable heavy interrupted forces. A new spring- loaded expansion screw was designed which created light and continuous forces. The purpose of this study was to compare the treatment effects and patients, problems with removable slow maxillary expansion and newly designed spring- loaded expansion screw.
Methods & Materials:
35 healthy Iranian children were divided randomly to two groups:  group I (25 patients) treated by removable expansion appliance and group II (10 patients) treated by spring- loaded expansion appliance. The active phase of expansion was monitored and arch sizes of the upper dental arches (inter- canine, inter- premolar, inter- molar and arch perimeter) were measured with a caliper on casts monthly. The patients requested to mark the intensity estimation of their problems during wearing of appliance on questionnaires which comprised 12 statements. The scores of individual question were added up to obtain a total score. The independent t-test and Mann- Whitney U-test were applied to analyze the data.
Results:
There were no significant differences in both groups in the mean of arch size changes in each appointment.(P>0.05) There was no significant difference in both groups in terms of the mean of scores of questionnaires. (P=0.352)
Conclusion:
There was no significant difference in terms of patients, problems and arch size changes in spring- loaded and removable expansion appliances. Therefore the newly designed expansion appliance might be assumed a proper substitute for traditional expansion appliances.

Key words:
 Orthodontic expansion, Palatal expansion screws, Arch size


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محل نشر یا ارائه:  کنگره 10 انجمن ارتودنتیست ها
سال ایرانی :  1391
موضوع:  ارتودنسی
Level:  Postgraduate

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