title: Orthodontic treatment of a mandibular incisor fenestration resulting from a broken retainer.
abstract: This article describes the orthodontic relapse with mandibular incisor fenestration in a 36-year-old man who had undergone orthodontic treatment 21 years previously. The patient reported that his mandibular 3 × 3 bonded retainer had been partially debonded and broken 4 years earlier. The mandibular left lateral incisor remained bonded to the retainer and received the entire load of the incisors; consequently, there was extreme labial movement of the root, resulting in dental avulsion. As part of the treatment, the root was repositioned lingually using a titanium-molybdenum segmented archwire for 8 months, followed by endodontic treatment, an apicoectomy, and 4 months of alignment and leveling of both arches. The treatment outcomes were excellent, and the tooth remained stable, with good integrity of the mesial, distal, and lingual alveolar bones and periodontal ligament. The 1-year follow-up showed good stability of the results.
authors.affiliation: Private practice, Santa Maria, Rio Grande do Sul, Brazil. Electronic address: marcelfarret@yahoo.com.br.
authors.forename: Marcel M
authors.initials: MM
authors.lastname: Farret
authors.affiliation: Professor and chairman, Department of Orthodontics, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul, Brazil.
authors.forename: Milton M B
authors.initials: MM
authors.lastname: Farret
authors.affiliation: Private practice, Florianópolis, Santa Catarina, Brazil.
authors.forename: Gustavo
authors.initials: G
authors.lastname: da Luz Vieira
authors.affiliation: Private practice, Santa Maria, Rio Grande do Sul, Brazil.
authors.forename: Jamal Hassan
authors.initials: JH
authors.lastname: Assaf
authors.affiliation: Professor, Department of Orthodontics, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.
authors.forename: Eduardo Martinelli S
authors.initials: EM
authors.lastname: de Lima
mesh_terms: D000328:Adult; D001047:Apicoectomy / Q000379:methods; D054893:Cone-Beam Computed Tomography / Q000379:methods; D004868:Equipment Failure; D005500:Follow-Up Studies; D005889:Gingival Recession / Q000209:etiology* / Q000628:therapy; D006801:Humans; D007180:Incisor / Q000293:injuries*; D008297:Male; D018704:Orthodontic Retainers / Q000009:adverse effects*; D012390:Root Canal Therapy / Q000379:methods; D014084:Tooth Avulsion / Q000209:etiology* / Q000628:therapy; D014085:Tooth Migration / Q000209:etiology / Q000628:therapy; D014087:Tooth Movement Techniques / Q000379:methods; D019415:Torque