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

Abstract

Objectives. The aim of this study was to evaluate the effect of the remaining coronal wallthickness of dentin on fracture resistance of endodontically treated anterior tooth restored by castpost and glass fiber post and core.Materials & Methods. A total number of 100 human maxillary central incisors were collectedand stored in an isotonic saline solution at room temperature until used. Teeth were randomlydivided into 3 main groups control group (CG), group A and B. Control group 20 endodonticallytreated 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 crownof 0.5mm and 1.0mm finish line width respectively.Group B, 40 ETT restored by glass fiber post and composite core. Group B, subdivided intosubgroup B1, subgroup B2 of 20 ETT and restored with metal crown of 0.5mm and 1.0mm finishline width respectively. The prepared specimens were subjected to load testing using a universaltesting machine. The fracture pattern was observed and fracture load results were then statisticallyanalyzed 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 followedby group A1 with a mean of 780.2±67.8 N and group A2with a mean of 521.5± 96.8 N then groupB1 with a mean of 489.24 ±30.61 N and the lowest mean fracture load of 388.32± 29.45 N was forgroup B2.Conclusion. The thickness of remaining coronal dentin affects the fracture resistance ofendodontically treated teeth received both casted metal and fiber post and core significantly.