Correlation between midline deviation and condylar position in patients with Class II malocclusion: A cone-beam computed tomography evaluation.

INTRODUCTION: Midline deviation of the mandible and maxilla can affect craniofacial growth and occlusion and cause consequences to the temporomandibular joint. The aim of this study was to evaluate the lateral displacement of the skeletal and dental midlines in relation to the condyle head position in Class II patients with cone-beam computed tomography. METHODS: We used 82 cone-beam computed tomography images. The lateral displacement of the skeletal and dental midlines considering the 3-dimensional reference plane was analyzed with points in the maxillary and mandibular central incisors, anterior nasal spine, and menton. The condyle-fossa relationship, concentric position of the condyles, and dimensional and positional symmetries between the right and left condyles were evaluated. RESULTS: There was a statistically significant difference regarding anterior nasal spine with maxillary central incisor, menton, and mandibular central incisor points for both sides, and also for maxillary central incisor-menton for the displacement of the left side. We found differences in the temporomandibular joint for inclination and diameter measurements of the condylar process. Strong correlations were observed between the maxilla and the condylar process diameter (right side) and the distance between the geometric centers (left side), in addition to a strong correlation between the sagittal midline displacement and the geometric center differences on the right and left sides. CONCLUSIONS: In patients with Class II malocclusion, lateral displacement of skeletal and dental midlines in relation to the condyle head position has a significant correlation with the anteroposterior difference between the geometric center of the right and left condylar processes.

Easysolution: correção ortodôntica com alinhadores estéticos / Easysolution: orthodontic correction with esthetic aligners ­ a case report

Os alinhadores podem ser uma opção de tratamento para correção de más-oclusões dentárias que envolvam, principalmente, os dentes anteriores. O sistema Easysolution é planejado com setup virtual e precisão nos movimentos dentários, alcançando melhor resultado. O objetivo deste trabalho foi apresentar a correção de um apinhamento suave na região anterior, com giroversões dentárias, além de discutir as vantagens e desvantagens desse sistema. O presente estudo confirma que é possível corrigir apinhamentos em dentes anteriores, e giroversões de incisivos de até 22°, com o sistema Easysolution.

The aligners can be a treatment option to correct dental malocclusions, mainly involving the anterior teeth. The Easysolution system is designed with virtual setup, with greater precision in tooth movement, achieving a better result. This case presents the correction of a slight crowding in the anterior region, and the giroversion of teeth 11, 21, 32 and 42, discussing the advantages and disadvantages of this system. This case report confirms that it is possible to correct crowding in anterior teeth and incisor rotations of up to 22°.