Comparison of the Vertical Root Fracture Resistance of Teeth Treated With Calcium Hydroxide and Ledermix Paste

Abstract

Aim:The aim of this in vitro study was to compare the effect of Ledermix paste and Calcium hydroxide (Ca(OH) 2 ) on root fracture resistance. Materials and Methods: Sixty extracted human mandibular premolars with single canals and straight roots were used. After the crowns were removed, the root canals were prepared with Reciproc R50 files. Smear layer of roots were removed using 17% EDTA followed by 5.25% NaOCl and distilled water. The roots were then randomly divided into four groups (n = 15) according to the medicaments used: Ledermix paste, Ca(OH) 2 , negative control, and positive control. Samples were stored at 37°C and 100% humidity for 3 weeks. The specimens in experimental and control groups were obturated with cold lateral compaction technique before fracture resistance assessment. Then the apical ends of the roots were embedded vertically inside 4 mm of the acrylic resin. A load was applied on the roots of all teeth to their long axis until fracture occurred. Data were analyzed using one-way analysis of variance (ANOVA) and post-hoc Tukey tests.