THE EFFECT OF REMAINING CORONAL DENTIN WALL THICKNESS ON FRACTURE RESISTANCE OF ENDODONTICALLY TREATED TEETH RESTORED WITH POST AND CORE

Objectives. The aim of this study was to evaluate the effect of the remaining coronal wall
thickness of dentin on fracture resistance of endodontically treated anterior tooth restored by cast
post and glass fiber post and core.
Materials & Methods. A total number of 100 human maxillary central incisors were collected
and stored in an isotonic saline solution at room temperature until used. Teeth were randomly
divided into 3 main groups control group (CG), group A and B. Control group 20 endodontically
treated teeth (ETT) without post and core fabrication restored with full metal crown.
Group A, 40 ETT restored by custom made casted metal post and core.
Group A, subdivided into subgroup A1, subgroup A2 of 20 ETT and restored with metal crown
of 0.5mm and 1.0mm finish line width respectively.
Group B, 40 ETT restored by glass fiber post and composite core. Group B, subdivided into
subgroup B1, subgroup B2 of 20 ETT and restored with metal crown of 0.5mm and 1.0mm finish
line width respectively. The prepared specimens were subjected to load testing using a universal
testing machine. The fracture pattern was observed and fracture load results were then statistically
analyzed using One-way analysis of variance (ANOVA ) in SPSS software.
Results. The highest mean fracture load of 991.5±54.1 N for The control group CG followed
by group A1 with a mean of 780.2±67.8 N and group A2with a mean of 521.5± 96.8 N then group
B1 with a mean of 489.24 ±30.61 N and the lowest mean fracture load of 388.32± 29.45 N was for
group B2.
Conclusion. The thickness of remaining coronal dentin affects the fracture resistance of
endodontically treated teeth received both casted metal and fiber post and core significantly.