Maxillary Posterior Teeth Distalization with Miniscrew Anchorage Relative to Force Vectors Applied to Different Lengths of Retraction Hook, Analyzed Using the Finite Element Method

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Thannapat Aungkatawiwat
Virush Patanaporn
Chaiy Rungsiyakull

Abstract

The purposes of this study were to investigate and compare the stress distributions and displacement pattern for maxillary posterior segment distalization. When the force magnitude 250 g was applied from the miniscew anchorage to the vertical positions of the retraction hook of 0, 2, 4, 6 and 8 mm, analyzed using the finite element method.


A 3-D finite element model was constructed to simulate the maxillary first and second premolars and molars, periodontal ligament, and alveolar process. Distalizing forces were applied through a miniscrew at modified infrazygoma area for maxillary posterior segment distalization. The displacement of each tooth was evaluated on x, y, and z-axis, and the von Mises stress distribution was visualized using color-coded scales.


When the force vector acted at the lowest vertical position of the retraction hook (0 mm), distal crown tipping occurred in every tooth, and intrusion occurred in the second premolars, first molars and second molars. But first premolars showed slightly extrusion. Furthermore, buccal out-rotation occurred in every tooth. When the force vector acted at the highest level of the retraction hook (8 mm), greater distal crown movement occurred in the second premolars, first molars and second molars than at any other level. But the first premolars showed a progressive decrease in distal crown tipping. Moreover, extrusion occurred in every tooth. Lingual in-rotation occurred in the second premolars, first molars and second molars. But the first premolars showed slight buccal out-rotation. However, the retraction hook levels of 0 mm and 2 mm showed distal movement in every tooth, with minimal movement in the vertical direction, but the retraction hook levels of 2 mm and 4 mm showed distal movement in every tooth, with minimal movement in the transverse direction than at the other hook
levels.


These results suggest that the low retraction hook levels of 0 mm, 2 mm and 4 mm showed greater distal movement with minimal vertical and transverse
movement than at the other hook levels. The high retraction hook levels of 6 mm and 8 mm showed greater vertical and transverse movement in every tooth except the second molar in the vertical direction and the first premolar in the transverse direction, which showed the least amount of movement. It was concluded that the vertical position of the retraction hook is an important factor in achieving controlled maxillary posterior teeth distalization because the type of tooth movement depends on the relationship between the line of force and the location of the center of resistance of the force system. 

Article Details

How to Cite
Aungkatawiwat, T. ., Patanaporn, V. ., & Rungsiyakull, C. (2018). Maxillary Posterior Teeth Distalization with Miniscrew Anchorage Relative to Force Vectors Applied to Different Lengths of Retraction Hook, Analyzed Using the Finite Element Method. Chiang Mai Dental Journal, 39(2), 77–89. Retrieved from https://he01.tci-thaijo.org/index.php/cmdj/article/view/195919
Section
Original article

References

Papadopoulos MA. Skeletal Anchorage in Orthodontic Treatment of Class II Malocclusion. Journal of Orthodontics 2015;42(1):87.

Almuhtaseb E, et al. The Recent About Growth Modification Using Headgear and Functional Appliances in Treatment of Class II Malocclusion: A Contemporary Review. IOSR Journal of Dental and Medical Sciences 2014; 13(4):39-54.

Baccetti T, Franchi L. A New Appliance for Molar Distalization. American Journal of Orthodontics and Dentofacial Orthopedics 2001;119(5):22.

Park HS, Lee SK, Kwon OW. Group Distal Movement of Teeth Using Microscrew Implant Anchorage. Angle Orthodontics 2005;75(4):602–609.

Sugawara J, et al. Distal movement of maxillary molars in nongrowing patients with the skeletal anchorage system. American journal of orthodontics and dentofacial orthopedics 2006;129(6):723-733.

Lin JJ. A new method of placing orthodontic bone screws in IZC. News and Trends in Orthodontics 2009;13(1):4-7.

Liou EJ, et al. A computed tomographic image study on the thickness of the infrazygomatic crest of the maxilla and its clinical implications for miniscrew insertion. American journal of orthodontics and dentofacial orthopedics 2007;131(3):352-356.

Nanda R, Uribe FA. Temporary anchorage devices in orthodontics. St. Louis: Mosby; 2009.

Marassi C. Mini-implant assisted anterior retraction. Dental Press J Orthod. 2008;13(5):57-74.

Ashekar SA, et al. Evaluation of optimal implant positions and height of retraction hook for intrusive and bodily movement of anterior teeth in sliding mechanics: A FEM study. The Journal of Indian Orthodontic Society 2013;47:479-482.

Song JW, et al. Finite element analysis of maxillary incisor displacement duringen-masseretraction according to orthodontic mini-implant position. The Korean Journal of Orthodontics 2016;46(4):242.

Sung EH, et al. Distalization pattern of whole maxillary dentition according to force application points. Korean journal of orthodontics 2015;45(1):20-28.

Anand KM, et al. Finite Element Analysis in Dentistry. International Journal of Engineering and Technical Research 2014;2(8).

Vikram NR, et al. Finite Element Method in Orthodontics. Indian Journal of Multidisciplinary Dentistry 2010;1(1).

Rudolph DJ, et al. A Finite Element Model of Apical Force Distribution From Orthodontic Tooth Movement. Angle Orthod 2001;71:127–131.

Coolidge ED. The Thickness of the Human Periodontal Membrane. The Journal of the American Dental Association and The Dental Cosmos 1937;24(8):1260-1270.

Sung SJ, et al. A comparative evaluation of different compensating curves in the lingual and labial techniques using 3D FEM. American journal of orthodontics and dentofacial orthopedics 2003;123(4):441-450.

Tanne K, et al. Three-Dimensional Finite Element Analysis For Stress In The Periodontal Tissue By Orthodontic Forces. American Journal of Orthodontics and Dentofacial Orthopedics 1987;92(6):499-505.

Toms SR, et al. Nonlinear stress-strain behavior of periodontal ligament under orthodontic loading. American Journal of Orthodontics and Dentofacial Orthopedics 2002;122(2):174-179.

Cattaneo PM, Dalstra M, Melsen B. Strains in periodontal ligament and alveolar bone associated with orthodontic tooth movement analyzed by finite element. Orthodontics & Craniofacial Research 2009;12:120–128.

Yoshida N, et al. In vivo measurement of the elastic modulus of the human periodontal ligament. Medical Engineering & Physics 2001;23(8):567-572.

Sia S, et al. Experimental determination of optimal force system required for control of anterior tooth movement in sliding mechanics. American Journal of Orthodontics and Dentofacial Orthopedics 2009;135(1): 36-41.

Sung SJ, et al. Effective en-masse retraction design with orthodontic mini-implant anchorage: a finite element analysis. American Journal of Orthodontics and Dentofacial Orthopedics 2010;137(5): 648-657.

Choi YJ, et al. Total distalization of the maxillary arch in a patient with skeletal Class II malocclusion. American journal of orthodontics and dentofacial orthopedics 2011;139(6):823-833.

Parashar A, et al. Torque Loss in En-Masse Retraction of Maxillary Anterior Teeth Using Mini implants with Force Vectors at Different Levels: 3D FEM Study. Journal of clinical and diagnostic research 2014;8(12):77-80.

Hedayati Z, Shomali M. Maxillary anterior en masse retraction using different antero-posterior position of mini screw: a 3D finite element study. Progress in Orthodontics 2016;17(1):31.

Tominaga J-y et al. Optimal Loading Conditions for Controlled Movement of Anterior Teeth in Sliding Mechanics. The Angle orthodontist 2009;79(6):1102-1107.

Heravi F. Effects of crown-root angle on stress distribution in the maxillary central incisors’ PDL during application of intrusive and retraction forces: a three-dimensional finite element analysis. Progress in Orthodontics 2013;14(1):26.