Fracture Resistance of Endodontically Treated Tooth Restored with Fiber Reinforced Composite Core and Crown at Different Heights of Ferrule

rate of teeth cemented with fiber posts was 58.7%, whereas 74.2% for metal posts (titanium).16 Previous studies have documented the introduction of a composite resin employed for dental restoration, everX Posterior (GC, Europe), which is a short fiber-reinforced composite.17,18 IntroductIonThe fracture resistance of the teeth after a root canal treatment depends on the amount of the remaining tooth structure, height of ferrule, position of the tooth in the oral cavity, and different types of post and core.[1][2][3][4] Among all of the above factors, the height of a ferrule has significantly increased the fracture resistance of root canal-treated teeth.5,6 A dental ferrule is the embracement of the tooth structure by a crown restoration at a required height prepared by a shoulder margin and parallel to coronal dentin walls.7 An adequate amount of ferrule height is required to significantly withstand the fracture load, and it has been suggested that the minimum ferrule height should be 2 mm.8,9 After the root canal treatment, the post and core are placed in the tooth with an inadequate tooth structure to support the remaining coronal tooth structure.10,11 The materials used for the post and core build-up should have adequate strength and resistance to ensure a successful restoration outcome.[12][13][14] Several materials are available for the core build-up, but the composite core possesses the highest compressive and flexural strength in comparison to amalgam and glass ionomer cement.15 To date, previous studies have reported several successful outcomes on the survival of the teeth restored with the post, core, and crown.It has been reported that after following up on 41 cases of fiber posts and 46 cases of metal posts (titanium) for up to 132 months, the survival 1,2,