Abstract
Objective This study aimed to evaluate the influence of three different inclinations of the incisal edge of Planas direct tracks (PDTs) on the upper deciduous incisors (15, 30, and 45 degrees) through simulations using the finite-elements method. Materials and Methods A three-dimensional virtual model of tooth 51 was elaborated by using the Rhinoceros computer-aided design (CAD) software. A mesh was constructed by using the Patran software, and the evaluations were processed by using the ANSYS 15.0 software. The geometry of the elements used consisted of a triangular-base tetrahedron composed of 2,167,386 elements and 3,012,995 nodal points. Results Progressive alterations of proportional intensity and distribution were seen in the areas of tension on the dentoalveolar structures, with increasing inclination of the edge of the PDT. The tractive contact tensions were seen to be concentrated in the vestibular apical thirds and palatine cervical thirds, while the compressive contact tensions were in the palatine apical thirds and vestibular cervical thirds. Conclusion It was concluded that a 30-degree inclination for the PDT was most appropriate for the cases of anterior crossbite in the deciduous dentition. Nevertheless, because this was a laboratory evaluation, clinical criteria and complementary examinations for each case need to be taken into consideration in making therapeutic decisions.
Highlights
Crossbite is one of the most frequent occlusal alterations present in malocclusion
This study aimed to evaluate the influence of three different inclinations of the incisal edge of Planas direct tracks (PDTs) on the upper deciduous incisors (15, 30, and 45 degrees) through simulations using the finite-elements method
In all the simulations analyzed, it was found that the tensions were distributed around the dental structure, bone tissue, periodontal ligament, and PDTs
Summary
Crossbite is one of the most frequent occlusal alterations present in malocclusion. It consists of an abnormal transversal or anteroposterior relationship between the maxillary and mandibular arches when they are at their habitual maximum intercuspation. It has the capacity to generate morphofunctional alterations of the maxillary and mandibular bones, having repercussions for the entire middle part and lower third of the face.[3,4,5,6] It may lead to exacerbation of mandibular growth and restriction of maxillary and mid-face growth. These alterations may lead to development of Angle class III dental relationships, a concave facial profile, facial asymmetry and functional adaptations with regard to mastication, phonetics, facial expression, and postural relationships of the head and neck. Inadequacies of the incisor enamel, periodontal alterations, and alterations to the temporomandibular joints may occur.[6,7,8,9,10,11]
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