Manufacturers offer various prescriptions of preadjusted brackets for use in the "straight-wire" orthodontic technique. However, the need to incorporate bends in the rectangular wires during orthodontic finishing has led to concerns regarding the type of prescription chosen and the credibility of information provided by the manufacturer. The aim of this study was to compare the slot angulations of Roth prescription preadjusted metallic brackets for the maxillary left central incisor and maxillary left canine. For each tooth type, 10 brackets of three commercial brands (GAC, Forestadent and Morelli) were selected. Two individual metal matrices for brackets and tooth positioning were made for each group of teeth. Captured images were obtained by standardized ortho-radial photography with a digital camera. Images were exported and analyzed with the Image J software package. Oneway ANOVA and Tukey statistical analyses were performed at the 5% significance level. For brackets of the maxillary left central incisor, differences in mean angulation were observed between the Morelli and GAC groups (p < 0.01) and between the Forestadent and GAC groups (p < 0.01). For brackets of the maxillary left canine, differences in mean angulation were found between the Morelli and GAC groups (p < 0.01) and between the Morelli and Forestadent groups (p < 0.05). In conclusion, despite their same prescription name, the different brands exhibited significantly different angulation measurements.

The clinical management of orthodontic patients with dental trauma before or during the treatment is mainly founded on clinical experience, expert opinions, and individual case reports. It is proposed in the literature that teeth sustaining mild trauma with minor damage to the periodontium (e.g. subluxation) should be followed for a period of time before being subjected to orthodontic forces. A minimum period of 3 months has been proposed. In this study, we used an animal model to investigate whether shorter observation periods could be established in case of mild trauma. The periradicular region of rat molars was examined microscopically to determine the biological events of tooth movement started 15 and 30 days after intentional subluxation using an experimental method to induce dentoalveolar trauma. Thirty adult male Wistar rats were assigned to 6 groups (n = 5): Group 1 (control - no trauma/orthodontic movement); Group 2: the animals received an orthodontic device and were sacrificed after 7 days; Groups 3 and 4: dentoalveolar trauma (subluxation) was experimentally induced by the application of an axial force of 900 cN on the occlusal surface of the maxillary right first molar, and the animals were sacrificed after 22 and 37 days, respectively; and Groups 5 and 6: 15 and 30 days, respectively, after force application, an orthodontic device was installed and the rats were sacrificed 7 days later. In G5 and G6, the periodontal ligament and pulp tissue were rich in cellular elements and blood vessels, the alveolar bone was preserved, and the root surface presented only very small areas of surface resorption (cementum), maintaining the characteristics of normality. In conclusion, the microscopic alterations in the gingival and periodontal tissues in response to an experimentally induced mild dentoalveolar trauma simulating subluxation were not sufficient to contraindicate starting the orthodontic movement 15 and 30 days after trauma.

Impaction of maxillary canines can be prevented by early intervention in the mixed dentition phase after the correct diagnosis of malocclusion, reducing the complexity of the treatment. This article reports the case of a 10-year-old patient who possessed impacted maxillary canines and, after early extraction of primary canines, had reestablished favorable permanent successors' eruption axis. This 5-year radiographic follow-up study with panoramic radiography shows that this can be used in practice and that an effective control strategy ensures the accuracy in the inclination of the impacted canines. Treatment success is related to early diagnosis and strategic interceptive treatment choice.

ResumoA evolução sistemática dos materiais ortodônticos impulsiona uma contínua inovação tecnológica com o objetivo de potencializar a biocompatibilidade dos tratamentos, tornando-os constantemente mais simples e eficientes. Mas, apesar de todo conteúdo publicado em revistas especializadas sobre os bráquetes autoligáveis (AL), o tema ainda é motivo de controversia, sobretudo mediante comparação da eficiência com os bráquetes convencionais (BC). Desse modo, o objetivo dessa revisão é fornecer embasamento científico para a utilização desses acessórios na rotina ortodôntica. Descritores: Movimentação Dentária; Desenho de Aparelho Ortodôntico; Fechamento de Espaço Ortodôntico. AbstractThe systematic evolution of orthodontic materials encourages a continuous technological innovation in order to enhance the biocompatibility of treatments, making them constantly simpler and more efficient. Nevertheless, despite all contents published in specialized periodicals on self-ligating brackets (SL), the subject is still a controversial matter, especially by comparing the efficiency with conventional brackets (CB ). Thus, the objective of this literature review bases on providing scientific basis for the use of these accessories in orthodontic routine. Descriptors: Tooth Movement; Orthodontic Appliance Design; Orthodontic Space Closure. ResumenLa evolución sistemática de los materiales de ortodoncia fomenta una innovación tecnológica continua con el fin de mejorar la biocompatibilidad de los tratamientos, lo que constantemente más simple y más eficiente. Pero a pesar de todo el contenido publicado en revistas especializadas en los soportes de autoligables (AL), el tema es todavía un tema de controversia, sobre todo mediante la comparación de la eficiencia con los brackets convencionales (BC). Por lo tanto, el objetivo de esta revisión es proporcionar una base científica para el uso de tales accesorios en la rutina de ortodoncia. Descriptores: Movimiento Dentario; Diseño de Aparato Ortodóncico; Cierre del Espacio Ortodóncico.