Introduction: The multifactorial etiology of malocclusion involves several factors such as genetic, epigenetic and environmental factors. Among various dental anomalies, the development of supernumerary teeth is also directly related to genetic factors and mesiodens is the most frequent type of anomaly. Case Report: Two monozygotic twin sisters, both of which presented mesiodens, but only one with associated anterior open bite. Supernumerary removal was performed in the two sisters, and the anterior open bite was treated with the use of a fixed palatine grid. Results: The case was finished with proper occlusion and intercuspidation, contemplating facial and dental esthetics. Conclusion: Observing the possible differences that occur in pairs of monozygotic twins, it can be concluded that the development of malocclusions is associated with an interaction between genetic, epigenetic and environmental factors. Thus, the diagnosis and treatment of malocclusion should be individualized for each patient.
Background Implant design and apical stability are principal parameters involved in achieving successful primary stability. Using polyurethane models to simulate post-extraction sockets, we investigated the effects of using differing blade designs on the primary stability of tapered implants and the impact of apical depth. Method Six polyurethane blocks were used to simulate post-extraction pockets. One of the implants presented self-tapping blades (Group A), while the other (Group B) did not. Seventy-two implants were placed at 3 different depths (5 mm, 7 mm, and 9 mm), and a torque wrench was used to measure the stability of the implants. Results When evaluating the implants (placed at 5 mm, 7 mm, and 9 mm apical to the socket), we observed that the torque of the Group B implants was higher than that of Group A implants (P < 0.01). At the 9-mm depth, there was no difference between the groups (Drive GM 34.92 Ncm and Helix GM 32.33 Ncm) (P > 0.001), and considering the same implant groups, those placed at 7-mm and 9-mm depths presented higher torques (p < 0.01) than those placed at 5-mm (p > 0.01). Conclusion Considering both groups, we concluded that an insertion depth of greater than 7 mm is needed for initial stability, and in situations involving reduced supportive bone tissue or low bone density, a non-self-tapping thread design improves implant stability.
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