Effect of bone defect width and a ferrule on the fracture characteristics of vertically fractured teeth reattached with adhesive resin cement: An <i>in vitro</i> study

Abstract

This study aimed to clarify the effects of vertical bone defect width and a ferrule on fracture of the fragments of fractured tooth reattached with adhesive resin cement (reattached tooth). The reattached tooth was built up by a fiber post and composite resin core for abutment and formed to the abutment with or without a ferrule. The vertical bone defect was fabricated with a V-shaped defect in different widths. The fracture load was evaluated using a universal testing machine. The vertical bone defect did not affect the fracture load, but a ferrule increased the root fracture load. For the specimens without a ferrule, debonding between the composite resin core and the root at the coronal loading side and fractures at the apical side of the root were found. In conclusion, the ferrule at abutment could affect fracture load and modes, and the bone defect width did not.

The Impact of Bonding Agents and Bone Defects on the Fracture Resistance of Reattached Vertically Root-Fractured Teeth

“…Diana HH et al [56] in their study on 3D-FEA noted a significant increase in stress concentration in the apical third of radicular dentin during oblique force application, especially in the area opposite the loading point, attributed to the rigidity of the metal-ceramic crown and tooth bending. The study conducted by Kyogoku K et al [57] showed that the width of V-shaped defect did not affect the fracture load of rebonded teeth. However, the presence of ferrule increased the root fracture load.…”