“To Analyze the Distribution of Root Canal Stresses after Simulated Canal Preparation of Different Canal Taper in Mandibular First Premolar by Finite Element Study – An In Vitro Study.”

Abstract

Was to Investigate stress distribution patterns in simulated biomechanically prepared mandibular first premolars with four different tapers at two different compaction forces and an occlusal load with finite element analysis. Six recently extracted, intact, non-carious, undestroyed mandibular premolars similar in-straight root canals were selected. Four finite element models were designed on the software varying only in canal taper of mandibular first premolars. Gutta-percha was compacted by vertical condensation technique in three separate vertical increments under two different vertical compaction forces that are 10N and 15N. Finite element meshes were generated with this model by using soft ware to know the pattern of distribution of radicular stresses during obturation. At last access opening will be filled by using simulated restorative material (composite). A masticatory load of 50N was applied; again Finite element meshes were generated. The highest circumferential and radial stresses were found during compaction of first gutta percha increment, while an increase in taper reduced the stress level for the same compaction force. During obturation, higher stresses were found at the canal surface, using the smallest taper, in apical third, during the first gutta percha increment and gradually decreased along the canal length. Root stresses during occlusal load application generates the highest stresses at external root surface and concentrate at cervical third, an increase taper size caused only slight lower root stresses. With increasing taper root stresses decreased during root canal obturation. Root fracture at the apical third is likely initiated during obturation. Root fracture at the cervical third is likely initiated during occlusal load.