Evaluation of Two Patterns of Mechanics for Pulling Uprighting Force on an Impacted Mandibular Second Molar using Retromolar Miniscrew Anchorage: A Finite Element Analysis
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Abstract
The objectives of this study were: to evaluate optimal force magnitude required to initiate the uprighting of a mesioangularly-impacted mandibular second molar (tooth 37) using two patterns of pulling uprighting mechanics with retromolar miniscrew anchorage, without exceeding the periodontal ligament capillary-vessel blood pressure (0.0047 MPa), and to describe the initial displacement pattern of tooth 37 when optimal force magnitude is applied. A 3-D (three-dimensional) model was reconstructed based on anatomic data from a CBCT scan, which was imported into ABAQUS finite element software, to simulate the two patterns of pulling uprighting mechanics. The pulling force direction was laid from a metal button on tooth 37 to a retromolar miniscrew. Various force magnitudes of 50 – 150 g were applied. Pattern 1 used one-button mechanics, which had one direction of force with the metal button located on the occlusal surface of tooth 37. Pattern 2 used two-button mechanics, which had two directions of force with the two metal buttons located on the middle of the buccal and lingual surfaces of tooth 37. Finite element analysis was performed to evaluate the optimal force magnitude for each pattern of mechanics. Moreover, the optimal force magnitude was used to simulate the initial displacement pattern of tooth 37. The result indicated that the optimal force magnitude was 87 g in Pattern 1 and 73.5 g in Pattern 2. The initial tooth displacement of tooth 37 when 87 g and 73.5 g force were applied with Patterns 1 and 2 mechanics, respectively, were extrusion crown movement to occlusal plane, distal crown tipping and slight buccal crown tipping. Tooth 37 in Pattern 2 was crown movement to occlusal more than in Pattern 1.
Article Details
บทความ ข้อมูล เนื้อหา รูปภาพ ฯลฯ ที่ได้รับการลงตีพิมพ์ในวิทยาสารทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่นถือเป็นลิขสิทธิ์เฉพาะของคณะทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่น หากบุคคลหรือหน่วยงานใดต้องการนำทั้งหมดหรือส่วนหนึ่งส่วนใดไปเผยแพร่ต่อหรือเพื่อกระทำการใด ๆ จะต้องได้รับอนุญาตเป็นลายลักษณ์อักษร จากคณะทันตแพทยศาสตร์ มหาวิทยาลัยขอนแก่นก่อนเท่านั้น
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