Intrusion of Six Maxillary Anterior Teeth Using Mini-screw Anchorage: A Finite Element Study
Objectives: To evaluate the von Mises stress distribution and displacement of the six maxillary anterior teeth intruded with two patterns of mini-screw anchorage, analyzed by the finite element method.
Methods: A finite element model of six maxillary anterior teeth with periodontal ligament and alveolar bone was constructed. In anchorage pattern 1, one mini-screw was placed between the central incisors with a net force of 60 g applied to the arch wire between the central incisors towards the mini-screw. In anchorage pattern 2, two mini-screws were placed between the lateral incisors and canines, left and right, with force applied to the arch wire between the central and lateral incisors in an oblique direction towards the mini-screws. The stress distribution and the displacement of the teeth were analyzed.
Results: In anchorage pattern 1, the von Mises stress on the central incisors was greater than that on the lateral incisors or canines. In anchorage pattern 2, the von Mises stress distribution was greater on the central and lateral incisors than on the canines. In anchorage pattern 1, all teeth were intruded with proclination. In anchorage pattern 2, the central incisors were intruded along their long axes, whereas the lateral incisors and canines were slightly proclined.
Conclusions: The two-mini-screw pattern distributes stress in four incisors and displaces teeth closer to pure intrusion than the one-mini-screw pattern.
Burstone CR. Deep overbite correction by intrusion. Am J Orthod 1977; 72: 1-22.
Burstone CJ. Biomechanics of deep overbite correction. Seminars in orthodontics 2001; 7: 26-33.
Sreedhar C, Baratam S. Deep overbite-A review (Deep bite, Deep overbite, Excessive overbite). Annals and Essences of Dentistry 2009; 1: 8-25.
Jain RK, Kumar SP, Manjula WS. Comparison of intrusion effects on maxillary incisors among mini implant anchorage, j-hook headgear and utility arch. J Clin Diagn Res 2014; 8: ZC21-ZC24.
Polat-Ozsoy O, Arman-Ozcirpici A, Veziroglu F. Miniscrews for upper incisor intrusion. Eur J Orthod 2009; 31: 412-416.
Ohnishi H, Yagi T, Yasuda Y, Takada K. A Mini-Implant for Orthodontic Anchorage in a Deep Overbite Case. Angle Orthod 2005; 75: 444-452.
Kim TW, Kim H, Lee SJ. Correction of deep overbite and gummy smile by using a mini-implant with a segmented wire in a growing Class II Division 2 patient. Am J Orthod Dentofacial Orthop 2006; 130: 676-685.
Upadhyay M, Nagaraj K, Yadav S, Saxena R. Mini-implants for en masse intrusion of maxillary anterior teeth in a severe Class II division 2 malocclusion. J Orthod 2008; 35: 79-89.
Nanda RS, Tosun Y. Biomechanics in Orthodontics: Principles and Practice. Hanover Park, IL, USA: Quintessence Publishing Co; 2010.
Park HK, Sung EH, Cho YS, Mo SS, Chun YS, Lee KJ. 3-D FEA on the intrusion of mandibular anterior segment using orthodontic miniscrews. Korean Assoc Orthod 2011; 41: 384-398.
Konda P, Tarannum S. Basic principles of finite element method and its applications in orthodontics. J Pharm Biomed Sci 2012; 16: 1-8.
Ansari T, Mascarenhas R, Paulose V. Trends in Orthodontics...Finite element analysis and its applications in orthodontics. APOS-Trends Orthod 2011; 2: 5-9.
Kojima Y, Kawamura J, Fukui H. Finite element analysis of the effect of force directions on tooth movement in extraction space closure with miniscrew sliding mechanics. Am J Orthod Dentofacial Orthop 2012; 142: 501-508.
Caballero GM, Carvalho Filho OA, Hargreaves BO, Brito HH, Magalhaes Jr PA, Oliveira DD. Mandibular canine intrusion with the segmented arch technique: A finite element method study. Am J Orthod Dentofacial Orthop 2015; 147: 691-697.
Choi JH, Yu HS, Lee KJ, Park YC. Three-dimensional evaluation of maxillary anterior alveolar bone for optimal placement of miniscrew implants. Korean J Orthod 2014; 44: 54-61.
Cifter M, Sarac M. Maxillary posterior intrusion mechanics with mini-implant anchorage evaluated with the finite element method. Am J Orthod Dentofacial Orthop 2011; 140: e233-e241.
Huang H, Tang W, Yan B, Wu B. Mechanical Responses of Periodontal Ligament under A Realistic Orthodontic Loading. Procedia Eng 2012; 31: 828-833.
Proffit WR, Fields HW, Sarver DM. The Biologic Basis of Orthodontic Therapy. Contemporary Orthodontics. 5th ed. St. Louis, MO, USA: Elsevier/Mosby; 2013: 286-287.
Salehi P, Gerami A, Najafi A, Torkan S. Evaluating Stress Distribution Pattern in Periodontal Ligament of Maxillary Incisors during Intrusion Assessed by the Finite Element Method. J Dent (Shiraz) 2015; 16: 314-322.
Saga AY, Maruo H, Argenta MA, Maruo IT, Tanaka OM. Orthodontic intrusion of maxillary incisors: a 3D finite element method study. Dental Press Inter 2016; 21: 75-82.
Artun J, Smale I, Behbehani F, Doppel D, Van't Hof M, Kuijpers-Jagtman AM. Apical root resorption six and 12 months after initiation of fixed orthodontic appliance therapy. Angle Orthod 2005; 75: 919-926.
Mohandesan H, Ravanmehr H, Valaei N. A radiographic analysis of external apical root resorption of maxillary incisors during active orthodontic treatment. Eur J Orthod 2007; 29: 134-139.
Yu JH, Shu KW, Tsai MT, Hsu JT, Chang HW, Tung KL. A cone-beam computed tomography study of orthodontic apical root resorption. J Dent Sci 2013; 8: 74-79.
Toms SR, Eberhardt AW. A nonlinear finite element analysis of the periodontal ligament under orthodontic tooth loading. Am J Orthod Dentofacial Orthop 2003; 123: 657-665.
Baumgaertel S, Hans MG. Buccal cortical bone thickness for mini-implant placement. Am J Orthod Dentofacial Orthop 2009; 136: 230-235.
Toms SR, Lemons JE, Bartolucci AA, Eberhardt AW. Nonlinear stress-strain behavior of periodontal ligament under orthodontic loading. Am J Orthod Dentofacial Orthop 2002; 122: 174-179.
Natali AN, Pavan PG, Scarpa C. Numerical analysis of tooth mobility: formulation of a non-linear constitutive law for the periodontal ligament. Dent Mater 2004; 20: 623-629.
Shibata T, Botsis J, Bergomi M, Mellal A, Komatsu K. Mechanical behavior of bovine periodontal ligament under tension-compression cyclic displacements. EJOS 2006; 114: 74-82.