| dc.description.abstract | Background and aims: Many orthodontic treatments require tooth extraction to create sufficient space for tooth
alignment, but concerns persist about the effect of this procedure on dental arch symmetry. This study aimed to
compare arch symmetry between extraction and non-extraction treatment plans using extra oral scanners.
Methods and Materials: This cross-sectional study was conducted on orthodontic casts of patients treated in
the post graduate orthodontic department, dentistry faculty of Tabriz University of medical sciences. A total of
60 casts were selected, including 30 casts, in which the treatment involved tooth extraction and had their first
premolars extracted, and another 30 casts, in which the treatment did not involve tooth extraction. After
selecting the casts, they were scanned using the rainbow scanner (Dentium, South Korea). Digital data were
analyzed using Exocad and Meshmixer and Photoshop software to compute transverse and anteroposterior arch
symmetry indices. The obtained data were compared using statistical tests to compare arch symmetry between
extraction and non-extraction groups.
Results:The results of data analysis indicated that in both canine and molar areas, there were no significant
differences in transverse and anteroposterior symmetry between the extraction and non-extraction groups.
Furthermore, inter-examiner and intra-examiner error mearurments showed that there was no noticeable error
while measuring data.
Conclusion: Extraction in orthodontic treatments, when performed correctly, does not significantly impact on
dental arch symmetry. Also the use of extra oral scanners may be beneficial for more accurate measurements in
orthodontists.
Keywords: Orthodontics, Dental Arch Symmetry, Tooth Extraction, Digital Dentistry, Dental Models. | en_US |
