Effects of different patterns of movement for correcting a deep curve of Spee with invisible orthodontic appliances on the anterior teeth: A finite element analysis

Abstract

Abstract Objective To evaluate the effects of five different patterns of mandibular molar movement and to define the most effective configuration to be implemented with clear aligners through finite element analysis. Methods A three-dimensional evaluation mandibular model with a deep overbite in the mandible was constructed based on cone beam computerized tomography (CBCT) data. The modelled components included mandibular dentition, mandibular periodontal ligaments, attachments, and aligners. Results Configuration A showed the highest distal displacement value, and configuration E showed the lowest value. For the central and lateral incisors, configuration E showed the highest PDL pressure. For canines, the difference between configurations C and D was not significant and the stress distribution differed among the five groups. Conclusion First, simultaneously, extruding the premolars during molar distalization could enhance the effectiveness of invisible aligners. Second, when expansion and extrusion are simultaneously performed during the distalization of teeth, attention must be given to the alveolar bone on the labial side of anterior teeth to prevent the occurrence of gingival recession, dehiscence, and fenestration.