IADR Abstract Archives
Assessment of the Fracture Resistance of Endodontically Treated Molar Teeth Restored with Short Fibre Composite, Polyethylene Fibre or Fixed Crown Restoration
Objectives: The purpose of this study was to compare the fracture resistance of endodontically treated molar teeth restored with using composite containing short fibre composite (everX posterior), polyethylene fibre reinforcement and conventional fixed crown restorations in MOD cavities.
Methods: Seventy-eight molar teeth were selected and assigned to six groups (n=13). Group 1 did not receive any preparation. In the other groups, the teeth were root filled and standard MOD cavities were prepared. Group 2 was left unrestored. Group 3 was restored with a composite (Z250, 3M ESPE, USA) material. In group 4, everX posterior composite (GC, Tokyo, Japan) was placed as a dentin and covered with a composite resin material. In group 5, a polyethylene fibre (Ribbond, Seattle, WA, USA) was inserted into the cavities in a bucco-lingual direction and covered with Z250 composite material. In group 6, the teeth were restored with a composite material and covered with conventional fixed crown restorations. The specimens were stored in 100% humidity media at 37oC degree for 7 days. Each specimen was placed in a universal testing machine and subjected to compressive loading at a crosshead speed of 0.5 mm/min. Data were subjected to analysis of variance (ANOVA) and Tukey post-hoc tests.
Results: The mean loading values in each group were as follows (N): (Group 1) 873.54 ± 140.02b, (Group 2) 173.14 ± 76.91d, (Group 3) 572.41 ± 147.27c, (Group 4) 703.31 ± 217.38bc, (Group 5) 651.37 ± 271.57bc, (Group 6) 1690.75 ± 464.06a. There were statistically significant differences between groups showed with different letters.
Conclusions: Within the limitations of this study, endodontic treatment significantly reduced the fracture resistance of molar teeth. Conventional fixed crown restorations had higher fracture strength than the other restorations. However, the fracture mode of fixed crown restorations were irreparable. For this reason, polyethylene fibre or everX posterior can be used for the coronal restoration of endodontically treated teeth. The clinical significance of this findings must be determined.
Methods: Seventy-eight molar teeth were selected and assigned to six groups (n=13). Group 1 did not receive any preparation. In the other groups, the teeth were root filled and standard MOD cavities were prepared. Group 2 was left unrestored. Group 3 was restored with a composite (Z250, 3M ESPE, USA) material. In group 4, everX posterior composite (GC, Tokyo, Japan) was placed as a dentin and covered with a composite resin material. In group 5, a polyethylene fibre (Ribbond, Seattle, WA, USA) was inserted into the cavities in a bucco-lingual direction and covered with Z250 composite material. In group 6, the teeth were restored with a composite material and covered with conventional fixed crown restorations. The specimens were stored in 100% humidity media at 37oC degree for 7 days. Each specimen was placed in a universal testing machine and subjected to compressive loading at a crosshead speed of 0.5 mm/min. Data were subjected to analysis of variance (ANOVA) and Tukey post-hoc tests.
Results: The mean loading values in each group were as follows (N): (Group 1) 873.54 ± 140.02b, (Group 2) 173.14 ± 76.91d, (Group 3) 572.41 ± 147.27c, (Group 4) 703.31 ± 217.38bc, (Group 5) 651.37 ± 271.57bc, (Group 6) 1690.75 ± 464.06a. There were statistically significant differences between groups showed with different letters.
Conclusions: Within the limitations of this study, endodontic treatment significantly reduced the fracture resistance of molar teeth. Conventional fixed crown restorations had higher fracture strength than the other restorations. However, the fracture mode of fixed crown restorations were irreparable. For this reason, polyethylene fibre or everX posterior can be used for the coronal restoration of endodontically treated teeth. The clinical significance of this findings must be determined.