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Self-ligating versus conventional ligating brackets in the treatment of the maxillary dentoalveolar constriction

Massoud Seifi
Professor, Dept. of Orthodontics, Dental School, Shahid Beheshti University of Medical Sciences

Objective:
To determine the efficiency, and effectiveness (occlusal indices, arch dimensions) of self-ligating brackets (SLB) in the treatment of the maxillary dental constriction in comparison with conventional ligating brackets (CLB).
Methods & Materials:
Twenty-two patients (9 males and 13 females), aged between 14 and 26 years, were randomly divided into two groups as non-extraction cases: 11 patients received the SLB and 11 received the CLB. Upper arch impressions were taken for pre-treatment records. Measurements were taken from pre- and post-treatment records and included maxillary intermolar (first), interpremolars (first and second), intercanine widths and maxillary molar angulation.  None of the patients exhibited posterior crossbites, but all had some degree of maxillary constriction prior to treatment. Stepwise regression analysis was performed for the purpose of comparison between the two groups.
Results:
The findings revealed a clinically and statistically significant (p<0.05) change in arch width dimension in the premolar and molar regions after treatment but it was not significant in the canine region (p=0.13). In comparing the findings of SLB group with CLB group, no difference in the amount of molar tipping associated with the increase in arch width and maxillary dentoalveolar expansion was found in this study. The self-ligating group showed a statistically greater intermolar width increase than the conventional group (p<0.05).
Conclusion:
The better efficiency (shortened chair time) and slightly more expansion of the maxillary arch  appear  to  be  the  significant  advantage  of  self-ligating  systems  over the conventional  systems.

Keywords:
Self-ligating bracket,Maxillary constriction,Arch dimension


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

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