Desenvolvimento de um dispositivo posicionador de acessórios ortodônticos com precisão vertical

Abstract

The bracket placement is important for the appropriate teeth alignment and leveling during orthodontic treatment. Instruments can be used to determine the position of vertical attachments at dental surface. They are prone to fail during their use because they allow buccolingual inclination and take wrong position of attachments. It may jeopardize a treatment, causing to individuals severe dental problems, such as change the length of the dental arch, intrusions, extrusions, premature contacts and even commit all estomatognatic system. Based on the vertical limitation of some instruments positioners, the aim of this study was to develop and test a star-like positioner that prevents a buccolingual inclination during its use. The instrument was created, modeled, patented and prototyped for laboratory tests. For analysis, 4 groups were defined with different clinical experience in orthodontics, with 6 participants in each group. Each individual bonded edgewise 0.022x0,028in brackets in a typodont with Class I malocclusion in maxillary and mandibular incisors, canines and premolars, first with a Boone gauge and at least 30-days after, with Estrela UFJF. Studies showed that Estrela UFJF had averages closer to the ideal (4mm) in groups with some experience in orthodontics than Boone gauge. In all groups available, the standard deviation was lower with the Estrela UFJF than with Boone gauge. Specific groups of teeth, which variances were lower with Estrela UFJF than with Boone gauge. It is concluded that the developed instrument presented less variations in bracket vertical positioning and some clinical orthodontic experience is necessary to its use.