Effect of Intra-canal Restorations on Fracture Resistance of Fixed Partial Denture Abutment
Objectives: To study the effect of the intra-canal restorations on the fracture resistance and failure mode of fixed partial denture (FPD) abutment.
Materials and Methods: Thirty models of a 3-unit FPD with 10 mm edentulous space were prepared and randomly divided into three groups (n=10) according to type of intra-canal restoration consist of cast post (CP), prefabricated fiber-reinforced post (FP) and no intra-canal restoration as a control. A full metal 3-unit FPD with flat occlusal surface was fabricated and cemented on each model with resin cement. The 10,000 N at a cross-head speed of 0.5 mm/min was loaded along the long axis of the pontic tooth of FPD until a fracture occurred. The fracture loads (N) were recorded and analyzed by using 1-way ANOVA (α=0.05). The fracture patterns were classified as restorable and non-restorable.
Results: The mean fracture load of CP (6250.079±688.337 N), FP (6454.780±556.534 N) and control (6849.830±673.003 N) were not significantly different (p=0.124). The 5 out of 10 specimens from CP shown vertical root fracture. The most of fractures in control and FP were classified as restorable type.
Conclusions: The difference of intra-canal restoration had no significant effect on the fracture resistance of FPD abutment but influenced to the abutment fracture pattern.
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