IADR Abstract Archives
Fracture resistance evaluation of different post-core systems in-vitro.
Objectives: Restoring excessively damaged teeth is a challenging clinical situation.Endodontic posts (glass and carbon fibers and cast-posts) and cores are used for enhancing retention and resistance. The aim of this study was to evaluate and compare the fracture resistance of post-core systems made of cast Ni-Cr, fiber post and composite core and pressed lithiumdisilicate post-core systems.
Methods: Root canal treatment was conducted on collected sound maxillary anterior teeth. After standardization of root length as 10 mm, post space was prepared.A total of 30 teeth were divided into 3 groups(n=10) randomly for Ni-Cr, lithium disilicate and fiber post-composite core. The impression of post space was taken with pattern resin. Following the laboratory procedures, Ni-Cr and lithium disilicate post-core were prepared. Fabricated post-cores and fiber posts were luted with duel-cure resin cement. After 24 hours test specimens were subjected to thermal cycling between 7 0C and 50 0 C and were subjected to fracture test with a cross-head speed of 1mm/min.Data were subjected to one-way ANOVA followed by Dunnett T3tests for statistical analyses (α=0.05) using SPSS 21.
Results: The mean and standard deviation of maximum fracture force were given in Table 1. Teeth which received Ni-Cr post cores had highest fracture resistance however lithium disilicate group had the least. There was no statistically significant difference between cast Ni-Cr and fiber post groups.
Conclusions: Within the limitations of this study it can be concluded that despite aesthetic advantages lithium disilicate ceramics are not an ideal material for post-core fabrication due to its low fracture resistance.
Methods: Root canal treatment was conducted on collected sound maxillary anterior teeth. After standardization of root length as 10 mm, post space was prepared.A total of 30 teeth were divided into 3 groups(n=10) randomly for Ni-Cr, lithium disilicate and fiber post-composite core. The impression of post space was taken with pattern resin. Following the laboratory procedures, Ni-Cr and lithium disilicate post-core were prepared. Fabricated post-cores and fiber posts were luted with duel-cure resin cement. After 24 hours test specimens were subjected to thermal cycling between 7 0C and 50 0 C and were subjected to fracture test with a cross-head speed of 1mm/min.Data were subjected to one-way ANOVA followed by Dunnett T3tests for statistical analyses (α=0.05) using SPSS 21.
Results: The mean and standard deviation of maximum fracture force were given in Table 1. Teeth which received Ni-Cr post cores had highest fracture resistance however lithium disilicate group had the least. There was no statistically significant difference between cast Ni-Cr and fiber post groups.
Conclusions: Within the limitations of this study it can be concluded that despite aesthetic advantages lithium disilicate ceramics are not an ideal material for post-core fabrication due to its low fracture resistance.