The viability of current obturating systems as Replacement Endodontic Monoblocks ? A 3 Dimensional Finite Element Analysis

Aim: This study was aimed to evaluate the viability of current obturating systems as replacememt endodontic monoblocks by three dimensional finite element analysis (FEA). The mechanical performance of central incisors obturated by different types of obturating materials was evaluated under three different loading conditions. Materials and Method: The model of the tooth and supporting structures was designed, based on material properties and features obtained from previous studies and review of literature. The tooth was obturated by three different obturating systems and three different loading conditions were separately considered i.e inclined load - 70 N at 45 degree to simulate masticatory forces, vertical load of 100 N applied on the incisal edge of crown to simulate bruxism and horizontal load of 100 N to simulate external traumatic forces. The FE stress analysis was performed with the ANSYS, a commercial FEM package. Results: The results of finite element analysis are expressed as stresses, i.e tensile compressive, shear or a combination known as Von Mises stresses. These stresses became increasingly more complex as additional interfaces with varying modulus of elasticity were incorporated from the primary to the tertiary monoblocks. Conclusion And Clinical Relevance: Replacement endodontic monoblocks created in the root canal spaces may be classified as primary, secondary, or tertiary depending on the number of interfaces present between the bonding substrate and the bulk material core. Within the limitations of the study it can be inferred that the closer the elasticity of modulus of the replacement monoblock to dentin, the lower the stresses generated. The viability of integrating this emerging concept in clinical situations is highlighted and the search for ideal obturating materials for reinforcing the root canal may be viewed as an ideal goal.