The Challenging Biomechanics in a Maxillary Lateral Incisor and Canine Transposition Malocclusion
Published: September 1, 2019 | DOI: https://doi.org/10.7860/JCDR/2019/41604.13109
Orlando Motohiro Tanaka, Giovani Ceron Hartmann, Bruna Povh, Fábio Strapasson, André Weissheimer
1. Professor, Graduate Dentistry Program in Orthodontics, Pontifícia Universidade Católica do Paraná, Curitiba, Brazil, School of Life Sciences, Diplomate of Brazilian Board of Orthodontics and Dentofacial Orthopedics, Postdoctoral Fellow at The Center for Advanced Dental Education at Saint Louis University.
2. Residency in Orthodontics Students, School of Life Sciences, Pontifícia Universidade Católica do Paraná, Curitiba, Brazil.
3. Residency in Orthodontics Students, School of Life Sciences Pontifícia Universidade Católica do Paraná, Curitiba, Brazil.
4. Undergraduation Student in Dentisty, School of Life Sciences Pontifícia Universidade Católica do Paraná, Curitiba, Brazil.
5. Adjunct Professor and Researcher Advanced Orthodontics of University of Southern California -USC.
Correspondence
Orlando Motohiro Tanaka,
Rua Imaculada Conceição, 1155 Prado Velho- Curitiba - Paraná - Brazil. CEP: 80215-901.
E-mail: tanakaom@gmail.com
Dental transposition is an alteration that occurs in dental positioning, involving two adjacent teeth. Transpositions of canines are usually accompanied by other dental anomalies such as impaction of the incisors, missing lateral incisor, peg shaped laterals, rotations or dilacerations. Twenty percent of the transpositions involve the canine and upper lateral incisors. Dental transpositions are rare and may be complete or incomplete. The aetiology of transposition is still obscure. Several populations were studied to determine the prevalence of dental transpositions. Twenty percent of the transpositions involve the canine and upper lateral incisors. A clinical case is presented here, with canine and lateral incisor transposition and the biomechanics used in orthodontic treatment for the positioning of the canine in Class I and in the line of occlusion has been described. Correction of the transposition was performed with a fixed appliance for three-dimensional biomechanical control. The root of the left lateral incisor was moved to the palatal side to allow the movement, with the inclination movement of the crown, to distal the canine. The position of the mini-implant favoured distal movement without loss of anchorage of the teeth of this hemi-arch (left). With the canine positioned in place, third-order folds were inserted in the arch to move the lateral root to the buccal side. The canine was positioned in Class I relation in the line of occlusion with health, aesthetics, function and gingival and periodontal health remained stable after a year follow-up, demonstrating that the applied biomechanics were correct.
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