Apical Root Resorption of Upper Incisors Caused by Retractive Tooth Movement: A Comparative Study between TMA Arch Wire with Loop and SSW with Sliding Mechanics
Keywords:
Apical Root Resorption, EARRAbstract
The objective of this comparative experimental study was to compare the external apical root resorption (EARR) of the upper anterior teeth in two groups of orthodontic patients with different upper incisor retraction techniques between the mechanism of TMA arch wire with loop and stainless-steel wire by sliding mechanics, 31 patients in each group. This study was performed in January 2019 to June 2020. Data was collected before incisor retraction by taking intra-oral radiographs of the two upper central incisors, both root and crown clearly visible using paralleling technique. Radiographs were repeated after retracting the front teeth against both canines. Root lengths were compared and compensated for radiographic distortion by calculating the proportional ratio of the orthodontic bracket that remained constant throughout tooth movement. Comparative data analysis of group proportions was performed using Chi-square statistics and external apical root resorption was compared by student T-test at a significance level of 0.05.
Results: After incisor retraction phase, the result found root length was reduced in both groups. But there was no statistically significant difference between the group of TMA arch wire with loop and the stainless-steel wire by sliding mechanics. Since root shortening was found after incisor retraction in both techniques. Therefore, each technique should be selected according to the material properties. Apply carefully force and continuously monitor the results of the treatment periodically to prevent permanent loss of root length and periodontal tissue.
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การละเมิดลิขสิทธิ์ถือเป็นความรับผิดชอบของผู้ส่งบทความโดยตรง
ผลงานที่ได้รับการตีพิมพ์ถือเป็นลิขสิทธิ์ของผู้นิพนธ์ ขอสงวนสิทธิ์มิให้นำเนื้อหา ทัศนะ หรือข้อคิดเห็นใด ๆ ของบทความในวารสารไปเผยแพร่ทางการค้าก่อนได้รับอนุญาตจากกองบรรณาธิการ อย่างเป็นลายลักษณ์อักษร
