open access
메뉴ISSN : 0376-4672
This case report describes the management of a 30-year-old woman with hopeless mandibular first molars and right maxillary second premolar. The treatment plan included mandibular second and third molar protraction after extraction of mandibular first molars. Mini-implants were placed between roots of first and second premolar. Sliding mechanics with lever arm was used to prevent inclination of molars. A good functional occlusion was achieved in 38 months without clinically significant side effects. Most of the extraction space of mandibular first molar was closed by protraction of second and third molars. The skeletal Class II pattern was improved by counterclockwise rotation of mandible through reduction of wedge effect. Mandibular molar protraction with orthodontic mini-implants in adequate cases would be a great alternative to prosthetic implant and reduce the financial and surgical burden of patients.
1) P Corraini, V Baelum, CM Pannuti, AN Pustiglioni, GA Romito, FE Pustiglioni. Tooth loss prevalence and risk indicators in an isolated population of Brazil. Acta Odontologica Scandinavica. 2009; 67:297-303
2) M.L. Stepovich. A clinical study on closing edentulous spaces in the mandible. Angle Orthod. 1979; 49(4):227-33.
3) WE Roberts, GR Arbuckle, M Analoui. Rate of mesial translation of mandibular molars using implant-anchored mechanics. Angle Orthod. 1996; 66(5):331-8.
4) ND Kravitz, T Jolley. Mandibular molar protraction with temporary anchorage devices. J Clin Orthod. 2008; 42(6):351-5.
5) SH Kim, YA Kook, DM Jeong, W Lee, KR Chung, G Nelson. Clinical application of accelerated osteogenic orthodontics and partially osseointegrated mini-implants for minor tooth movement. Am J Orthod Dentofacial Orthop. 2009; 136:431-9.
6) UB Baik, YS Chun, MH Jung, J Sugawara. Protraction of mandibular second and third molars into missing first molar spaces for a patient with an anterior open bite and anterior spacing. Am J Orthod Dentofacial Orthop. 2012; 141:783-95.
7) YA Kook, W Lee, SH Kim, KR Chung. Corticotomy-assisted space closure in adult patients with missing lower molars. J Clin Orthod. 2013; 47(2):85-95.
8) H Mimura. Protraction of mandibular second and third molars assisted by partial corticision and miniscrew anchorage. Am J Orthod Dentofacial Orthop. 2013; 144:278-89.
9) SJ Kim, EH Sung, JW Kim, HS Baik, KJ Lee. Mandibular molar protraction as an alternative treatment for edentulous spaces: Focus on changes in root length and alveolar bone height. J Am Dent Assoc. 2015:146(11):820-9.
10) JH Park. Key factors in molar uprighting and protraction with TADs. 2017 AAO 117th Annual Session. San Diego, CA.
11) Lee KJ, Joo E, Yu HS, Park YC. Restoration of an alveolar bone defect caused by an ankylosed mandibular molar by root movement of the adjacent tooth with miniscrew implants. Am J Orthod Dentofacial Orthop. 2009; 136(3):440-9.
12) J Winkler, N Göllner, P Göllner, Pawel Pazera, N Gkantidis. Apical root resorption due to mandibular first molar mesialization: A split-mouth study. Am J Orthod Dentofacial Orthop. 2017; 151(4):708-17.
13) F Uribe, N Janakiraman, AN Fattal, GP Schincaglia, R Nanda. Corticotomy-assisted molar protraction with the aid of temporary anchorage device. Angle Orthod. 2013; 83:1083–92.
14) KH Zawawi. Patients’ acceptance of corticotomy-assisted orthodontics. Patient Prefer Adherence. 2015; 9:1153–8.
15) B Samruajbenjakun, K Kanokpongsak, C Leethanakul. Comparison of clinical and histological characteristics of orthodontic tooth movement into recent and healed extraction sites combined with corticotomy in rats. Korean J Orthod. 2018; 48(6):405-11.
16) S Nakatsu, Y Yoshinaga, A Kuramoto, F Nagano, I Ichimura, K Oshino, A Yoshimura, Y Yano, Y Hara. Occlusal trauma accelerates attachment loss at the onset of experimental periodontitis in rats. J Periodont Res. 2014; 49:314–22.