IADR Abstract Archives
CBCT-Based Biomechanical Models for the Study of Tooth Auto-Transplantation Outcomes
Objectives: This study aimed to use CBCT-based biomechanical models for the analysis of tooth auto-transplantation outcomes.
Methods: 3D models were created based on CBCT scans of 6 patients (mean age 11.54 y ± 0.81) having undergone tooth auto-transplantation from the premolar region to the anterior-maxillary area (EC: S55287). Included patients had a pre-operative and a one-year follow-up CBCT. All scans were registered and segmented into their different structures; bony structures (with cortical, trabecular and sclerotic bone), teeth (including enamel, dentin and pulp tissue), and a simulated periodontal ligament. Contra-lateral central incisors were analysed as negative controls.
Models were then meshed using Desk Software, and finite element analyses were performed based on a design-of-experiment approach. All dental materials were modelled to be homogeneous and linearly elastic except for the periodontal ligament, which was modelled hyper-elastic. The attributed material properties were referenced from the literature. A perfect bonding between each component was simulated, and an oblique load of 300 N was applied to simulate masticatory forces. The nodes of the lateral faces of the cortical bone were constrained to prevent displacement. The finite element analysis was conducted on the software Abaqus (Dassault Systèmes, Vélizy-Villacoublay, France) to calculate the von Mises stresses occurring at the level of the tooth and surrounding bony structures.
Linear and volumetric measurements were finally performed to assess tissue change at the root level at different time points.
Results: Preliminary results suggest statically significant differences in the distribution of von Mises stresses between all six cases of auto-transplanted teeth. In contrast, no statistically significant differences between control central incisors were noted between the different time points.
Conclusions: Accurate patient-specific modelling (PSM) combined with finite element analyses could help us understand the influence of stress distribution on root formation following TAT and could further open doors regarding our understanding of oral biomechanics and their impact on tooth root tissue remodeling following TAT.
Methods: 3D models were created based on CBCT scans of 6 patients (mean age 11.54 y ± 0.81) having undergone tooth auto-transplantation from the premolar region to the anterior-maxillary area (EC: S55287). Included patients had a pre-operative and a one-year follow-up CBCT. All scans were registered and segmented into their different structures; bony structures (with cortical, trabecular and sclerotic bone), teeth (including enamel, dentin and pulp tissue), and a simulated periodontal ligament. Contra-lateral central incisors were analysed as negative controls.
Models were then meshed using Desk Software, and finite element analyses were performed based on a design-of-experiment approach. All dental materials were modelled to be homogeneous and linearly elastic except for the periodontal ligament, which was modelled hyper-elastic. The attributed material properties were referenced from the literature. A perfect bonding between each component was simulated, and an oblique load of 300 N was applied to simulate masticatory forces. The nodes of the lateral faces of the cortical bone were constrained to prevent displacement. The finite element analysis was conducted on the software Abaqus (Dassault Systèmes, Vélizy-Villacoublay, France) to calculate the von Mises stresses occurring at the level of the tooth and surrounding bony structures.
Linear and volumetric measurements were finally performed to assess tissue change at the root level at different time points.
Results: Preliminary results suggest statically significant differences in the distribution of von Mises stresses between all six cases of auto-transplanted teeth. In contrast, no statistically significant differences between control central incisors were noted between the different time points.
Conclusions: Accurate patient-specific modelling (PSM) combined with finite element analyses could help us understand the influence of stress distribution on root formation following TAT and could further open doors regarding our understanding of oral biomechanics and their impact on tooth root tissue remodeling following TAT.