American Journal of Orthodontics and Dentofacial Orthopedics

Directory: AAO Officers and Organizations Publication date: July 2019 Source: American Journal of Orthodontics and Dentofacial Orthopedics, Volume 156, Issue 1 Author(s):

Cephalometry in orthodontics: 2D and 3D Publication date: July 2019 Source: American Journal of Orthodontics and Dentofacial Orthopedics, Volume 156, Issue 1 Author(s): Anne-Marie Bollen

July 2019:156(1) Publication date: July 2019 Source: American Journal of Orthodontics and Dentofacial Orthopedics, Volume 156, Issue 1 Author(s): Allen H. Moffitt

It's over: The exit dilemma Publication date: July 2019 Source: American Journal of Orthodontics and Dentofacial Orthopedics, Volume 156, Issue 1 Author(s): Laurance Jerrold

CAD-CAM–fabricated mini-implant insertion guides for the delivery of a distalization appliance in a single appointment Publication date: July 2019 Source: American Journal of Orthodontics and Dentofacial Orthopedics, Volume 156, Issue 1 Author(s): Benedict Wilmes, Sivabalan Vasudavan, Dieter Drescher This article reports on the technical aspects of using a computer-aided design–computer-aided manufacturing (CAD-CAM) insertion guide for the placement of orthodontic mini-implants used for the purpose of providing anchorage support for maxillary molar distalization. A 10-year-old girl presented with a bilateral full-step Angle Class II molar relationship in the permanent dentition, with anterior arch-length insufficiency and blocked out maxillary canine teeth. The primary treatment objective was to provide an esthetic and functional occlusal outcome, and secondarily to avoid the removal of multiple premolar teeth. The patient was initially treated with an implant-supported distalization device, and the occlusion was subsequently detailed with preadjusted fixed orthodontic appliances. The CAD-CAM procedure facilitates the safe and precise insertion of mini-implants in the anterior palate, potentially broadening the scope of use of palatal mini-implants for less experienced clinicians. The illustrated protocol allows for the insertion of mini-implants and fitting of a prefabricated appliance in a single office appointment.

An unusual case of invasive cervical resorption after piezosurgery-assisted en masse retraction Publication date: July 2019 Source: American Journal of Orthodontics and Dentofacial Orthopedics, Volume 156, Issue 1 Author(s): Nilüfer İrem Tunçer, Cansu Köseoğlu-Seçgin, Ayça Arman-Özçırpıcı A 16-year-old patient sought orthodontic correction for profile improvement and labially inclined maxillary incisors. She had Class II malocclusion, protrusive maxillary and mandibular incisors, and increased overjet and overbite with an American Board of Orthodontics discrepancy index value of 25. She was treated with maxillary premolar extractions and miniscrew-supported en masse retraction assisted with piezoincisions. Extraction spaces (7.5 mm per side) were closed with maximum anchorage in 10 months. Total treatment time was 23 months. Twenty-seven months after debonding, a pink spot was noted at the buccocervial region of the left central incisor. Radiographic evaluation on cone-beam computed tomographic scans revealed a severe case of invasive cervical resorption on both central incisors, around which the piezosurgical cuts had been made. Treatment proceeded with a nonintervention approach and the affected teeth were reinforced with a lingual retainer.

Comprehensive treatment approach for bilateral idiopathic condylar resorption and anterior open bite with customized lingual braces and total joint prostheses Publication date: July 2019 Source: American Journal of Orthodontics and Dentofacial Orthopedics, Volume 156, Issue 1 Author(s): Jue Wang, Eva Veiszenbacher, Peter D. Waite, Chung H. Kau This case report describes the successful treatment of a 14-year-old girl with severe bilateral idiopathic condylar resorption and resultant mandibular retrusion, increased overjet, and anterior open bite. The nonextraction treatment plan included (1) aligning and leveling the teeth in both arches, (2) performing Le Fort I maxillary osteotomy, bilateral condylectomy, and mandibular joint replacement, and (3) postsurgical correction of the malocclusion. The orthodontic treatment was initiated with the use of custom lingual appliances followed by orthognathic surgery planned with virtual surgical planning. Patient-fitted and customized temporomandibular joint implants were designed and manufactured based on the patient's stereolithic bone anatomic model. Treatment was concluded with detailed orthodontic finishing. Optimum esthetic and functional results were achieved with the cooperation of 2 specialties and the use of state-of-the-art technology.

Correcting severe scissor bite in an adult Publication date: July 2019 Source: American Journal of Orthodontics and Dentofacial Orthopedics, Volume 156, Issue 1 Author(s): Un-Bong Baik, Yunji Kim, Junji Sugawara, Christine Hong, Jae Hyun Park Scissor bite often remains unnoticed by patients although it can adversely affect facial symmetry, jaw growth, and mastication. This case report illustrates the efficacy of temporary skeletal anchorage devices (TSADs) and a modified lingual arch in correcting severe scissor bite. A 28-year-old woman presented with severe scissor bite in the mandibular right posterior segment. To treat this condition, TSADs were used for maxillary posterior intrusion and a modified lingual arch for buccally uprighting mandibular posterior teeth. Long-term retention records demonstrate stable treatment results.

Three novel genes tied to mandibular prognathism in eastern Mediterranean families Publication date: July 2019 Source: American Journal of Orthodontics and Dentofacial Orthopedics, Volume 156, Issue 1 Author(s): Pamela G. Genno, Georges M. Nemer, Savo Bou Zein Eddine, Anthony T. Macari, Joseph G. Ghafari Introduction Mandibular prognathism (MP) is subject to major polygenic influence and segregates within families in autosomal dominance with variable expressivity and incomplete penetrance. We aimed to identify the inheritance pattern and genes and loci involved in the development of MP in Mediterranean families and to evaluate the dentoskeletal characteristics of affected individuals. Methods Fifty-one eastern Mediterranean families with individuals affected by MP were identified. Data and biospecimens were collected from 14 of the families, including clinical examination, lateral cephalography (on subjects with Class III malocclusion), and 5 mL blood drawn from consenting affected and nonaffected relatives. Next-generation sequencing (NGS) was performed on 8 families (7 Lebanese, 1 Lebanese/Syrian), including large numbers of affected individuals over many generations and severe conditions, with the use of whole-exome sequencing. Results Most pedigrees suggested autosomal-dominant inheritance with an equal number of affected male and female individuals. Affected individuals had macrognathic and prognathic mandibles with dentoalveolar compensation. Genetic screening did not correspond with previously reported MP-linked genes, but yielded 3 novel genes (C1orf167, NBPF8, NBPF9) on chromosome 1 potentially responsible for mandibular development and macrognathism. Conclusions In this first genetic study with the use of NGS on the largest reported number of families with MP, novel genes (C1orf167, NBPF8, NBPF9) were associated with familial MP in the eastern Mediterranean population.

Transverse and torque dental changes after passive self-ligating fixed therapy: A two-year follow-up study Publication date: July 2019 Source: American Journal of Orthodontics and Dentofacial Orthopedics, Volume 156, Issue 1 Author(s): Alessandra Lucchese, Maurizio Manuelli, Paolo Albertini, Luis Huanca Ghislanzoni Introduction Self-ligating appliances are purposed to expand the arches, but evidence on stability of the result is lacking. We measured the width of maxillary and mandibular arches and torque changes after treatment with the use of passive self-ligating appliances and assessed stability at the 2-year follow-up. Methods Maxillary and mandibular 3-dimensional (3D) models from 32 subjects (mean initial age 14.9 ± 0.9 years), consecutively treated with the use of self-ligating appliances, were obtained before, immediately after, and 2 years after treatment. Dental arches were examined with the use of 3D software to evaluate differences in transverse arch dimensions and torque values. Results An incremental increase of arch widths was recorded, especially regarding maxillary and mandibular premolars. The increase in the transverse diameters was associated with a significant positive torque gain. No significant changes in arch perimeter and depth were recorded. In the retention period, slight significant changes in transverse diameters were recorded, and a transverse diameter constriction detected. Torque values remained almost unchanged in the follow-up period. Conclusions Transverse arch dimensions, along with torque values, increased significantly after treatment with the use of a passive self-ligating appliance. In the 2 years following treatment, a tendency to transverse diameter restriction, especially for the maxillary and mandibular premolars, was observed.