en ارتودنسی Orthodontics پژوهشي Research <div style="text-align: justify;"><span style="line-height:2;"><span style="font-size:12px;"><span style="font-family:Tahoma;"><span carlito=""><b><span new="" roman="" times="">Background</span></b><span new="" roman="" times="">: External apical root resorption (EARR) is a common iatrogenic complication following orthodontic treatment. Due to the increasing demand for orthodontic treatment among adults, <span style="color:black">there has been a rise in the number of middle-aged patients</span>. <span style="color:black">This study aimed</span> to assess the prevalence of EARR in these patients in comparison to <span style="letter-spacing:-.25pt">younger patients. </span></span></span><br> <span new="" roman="" times=""><b>Materials and Methods</b>: This cross-sectional retrospective analytical study was performed on panoramic radiographs taken before and one year after the initiation of orthodontic treatment in 78 patients<span style="letter-spacing:-.5pt"> in </span>three age groups. The first group consisted of 28 patients aged 17-25 years(adolescents), the second group consisted of 28 patients aged 25-35 years(younger adults), and the third group consisted of 22 patients aged 40-50 years( middle aged). The outline of the maxillary incisors was traced onto acetate sheets from panoramic radiographs and compared. The collected data was analyzed using Kruskal-Wallis, Mann-Whitney, and Wilcoxon (&alpha;= 0.05).</span><br> <span carlito=""><b><span new="" roman="" times="">Results</span></b><span new="" roman="" times="">: The mean EARR in the adolescents, younger adults, and middle-aged groups <span style="color:black">showed no </span>significant difference in the right central (P=0.322) and left central (P=0.289) <span style="color:black">incisors</span>. <span style="color:black">No</span> significant difference was seen <span style="color:black">in</span> the right lateral (P=0.358) and left lateral (P=0.739) <span style="color:black">incisors. The average amount of external root resorption in the upper incisors was similar in men and women (P>0.05). </span>Also, there was no significant difference between the two treatment methods in the right central (P=0.232), left central (P=0.204), right lateral (P=0.204), and left lateral (P=0.882) <span style="color:black">incisors</span>.</span></span><br> <b><span new="" roman="" times="">Conclusion</span></b><span new="" roman="" times="">: The mean EARR <span style="color:black">was similar between studied groups. External apical root<span style="letter-spacing:-.35pt"> resorption </span>did not show correlation</span> with age and gender</span></span></span></span></div> 25 31 http://cofs.khuisf.ac.ir/browse.php?a_code=A-10-1-42&slc_lang=en&sid=1 Fatemeh sadat Dehghani 1003194753284600857 1003194753284600857 No Faculty of dentistry, Isfahan (khorasgan) Branch, Islamic Azad University, Isfahan, Iran Mehdi Rafiei 1003194753284600858 1003194753284600858 Yes Department of Orthodontics, Faculty of Dentistry, Isfahan (khorasgan) Branch, Islamic Azad University, Isfahan, Iran Parisa Ranjbarian 1003194753284600859 1003194753284600859 No Department of Endodontics, School of Dentistry, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran Pegah Shayestehmehr 1003194753284600860 1003194753284600860 No Department of orthodontics, Faculty of Dentistry, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran