IADR Abstract Archives
Biomechanical Behavior of Different Restorations in Endodontically Treated Teeth
Objectives: This study evaluated the biomechanical behavior of different post-endodontic treatments in crowned central incisors with different load application point, simulating an edge-to- edge bite and Class I normal occlusion.
Methods: An endodontically treated upper central incisor was modeled for finite element analysis. Three different approaches were carried out on this model: composite resin buildup without post (BUP), glass fiber post-retained composite resin buildup (GFP), and cast post-and-core (CPC). All models received full crown preparation with 2-mm ferrule, and a leucite-reinforced ceramic crown. The models were evaluated in the analysis software (ANSYS 17.2, ANSYS Inc., Houston, TX, USA). Two different loadings of 400 N (30°) were applied: 2 mm above cingulum and 2 mm below the incisal edge. The solids were considered homogeneous, linearly elastic and isotropic, except the fiber post that was considered orthotropic. A structural static analysis was performed and the Maximum Principal Stress criteria was used to evaluate the stress distribution in the restoration, cement layer and root dentin.
Results: Similar stress concentration was observed regardless the post- endodontic treatment at the two different loading. However, the CPC group presented higher values at the root dentin when the load was applied near the cingulum. When the load was applied near the incisal edge, the BUP group concentrated more stress at the root middle third. All groups presented high stress concentration in the crown when the load was applied near the incisal edge.
Conclusions: At the load scenario evaluated and with 2-mm ferrule, when the load was applied near the cingulum, the presence and type of post and core system had no significant effect on the stress concentration at the root canal. In an edge-to-edge bite, all treatments presented high stress concentration, and the most critical region was the ceramic crown for all models.
Methods: An endodontically treated upper central incisor was modeled for finite element analysis. Three different approaches were carried out on this model: composite resin buildup without post (BUP), glass fiber post-retained composite resin buildup (GFP), and cast post-and-core (CPC). All models received full crown preparation with 2-mm ferrule, and a leucite-reinforced ceramic crown. The models were evaluated in the analysis software (ANSYS 17.2, ANSYS Inc., Houston, TX, USA). Two different loadings of 400 N (30°) were applied: 2 mm above cingulum and 2 mm below the incisal edge. The solids were considered homogeneous, linearly elastic and isotropic, except the fiber post that was considered orthotropic. A structural static analysis was performed and the Maximum Principal Stress criteria was used to evaluate the stress distribution in the restoration, cement layer and root dentin.
Results: Similar stress concentration was observed regardless the post- endodontic treatment at the two different loading. However, the CPC group presented higher values at the root dentin when the load was applied near the cingulum. When the load was applied near the incisal edge, the BUP group concentrated more stress at the root middle third. All groups presented high stress concentration in the crown when the load was applied near the incisal edge.
Conclusions: At the load scenario evaluated and with 2-mm ferrule, when the load was applied near the cingulum, the presence and type of post and core system had no significant effect on the stress concentration at the root canal. In an edge-to-edge bite, all treatments presented high stress concentration, and the most critical region was the ceramic crown for all models.
