Evaluation of Chemical Components Changes in Radicular Dentin After Different Final Surface Treatments

*Corresponding author INTRODUCTION Sodium hypochlorite (NaOCl) is frequently used as a chemical irrigant for endodontic therapy due to its antibacterial and organic tissue dissolution properties. Its remnants and by-products adversely affect the polymerization of dental adhesive systems (1). Researchers had stated that the bulk of dentin properties could be repaired by more than 60 seconds of application of antioxidant solution before the adhesive procedure, since it can neutralize and reverse oxidizing effect of the NaOCltreated dentin surface (2).This study aimed to evaluate the effect of varying post-space dentin surface treatment methods by using citric acid CA, sodium ascorbate SA solutions and 970 diode laser DL on the energy-dispersive X-ray (EDX) spectroscopy of dentin composition after surface treatments. METHODOLOGY Thirty-six mandibular second premolars were selected; endodontically treated and post-spaces were prepared. The root specimens were divided into four groups n=9/gp according to post-space dentin surface treatments performed; Control group (CL) received 5ml saline; Group (CA) citric acid was treated for 15s with 10%CA then 30s with distilled water; Group (SA) sodium ascorbate was treated with 20ml 10%SA for 10min then washed 30s with distilled water; Group (DL) 970 nm diode laser were irradiated to the specimens in continuous mode, spiral motion for 20s: 1.5W output power, 20 Hz frequency, 238.85 J/cm2 (3). Each specimen was sectioned longitudinally in a bucco-lingual direction into two halves (4). For each half, the elemental analysis of the following elements: C, O, Mg, Ca, and P were conducted on three points along the root canal . (Figure 1)