IADR Abstract Archives
Fracture Resistance Of Restorations In Endodontically-Treated Teeth Caused From Abfraction
Objectives: The purpose of this study was to evaluate the fracture resistance of different restoration types in endodontically treated teeth with simulated abfraction lesions.
Methods: Thirty-two extracted maxillary first premolars were prepared abfraction lesions on their bucco-cervical surfaces, subsequently restored with resin composite, and endodontically treated. The teeth were randomly divided into 4 groups for different restorations (n=8); resin composite filling in access opening (RF), fiber post with resin composite filling (P/RF), zirconium crown (ZC), and fiber post with zirconium crown (P/ZC). The teeth were placed into acrylic resin blocks with simulated PDL. The specimens were subjected to compressive loading at central fossae, 30° to long axis of the teeth until failure. Two-way ANOVA and Tukey tests were used to analyzed the data (α=0.05).
Results: The results showed that crown groups (ZC and P/ZC) had significantly higher fracture resistance than non-crown groups (RF and P/RF) (p<0.05). There was no difference of the fracture resistance in fiber post groups (p>0.05). Additionally, there was no interaction between crowns and posts (p>0.05).
Conclusions: This study concluded that zirconium crowns significantly increased the fracture resistance in endodontically treated premolars with simulated abfraction lesions. The fiber posts did not affect the fracture resistance, however, the present of post might help to retain the crown to the root which could prevent sudden crown lost.
Methods: Thirty-two extracted maxillary first premolars were prepared abfraction lesions on their bucco-cervical surfaces, subsequently restored with resin composite, and endodontically treated. The teeth were randomly divided into 4 groups for different restorations (n=8); resin composite filling in access opening (RF), fiber post with resin composite filling (P/RF), zirconium crown (ZC), and fiber post with zirconium crown (P/ZC). The teeth were placed into acrylic resin blocks with simulated PDL. The specimens were subjected to compressive loading at central fossae, 30° to long axis of the teeth until failure. Two-way ANOVA and Tukey tests were used to analyzed the data (α=0.05).
Results: The results showed that crown groups (ZC and P/ZC) had significantly higher fracture resistance than non-crown groups (RF and P/RF) (p<0.05). There was no difference of the fracture resistance in fiber post groups (p>0.05). Additionally, there was no interaction between crowns and posts (p>0.05).
Conclusions: This study concluded that zirconium crowns significantly increased the fracture resistance in endodontically treated premolars with simulated abfraction lesions. The fiber posts did not affect the fracture resistance, however, the present of post might help to retain the crown to the root which could prevent sudden crown lost.