IADR Abstract Archives
Evaluation of Chemical Components Changes in Radicular Dentin After Different Final Surface Treatments
Objectives: After post-space preparation, a thick smear layer covers the dentin walls, which might interfere with the bonding of root-canal dentin. As a result, the post-space should be debrided before cementation. Some irrigants' by-products interfere with the polymerization of adhesive and dentin mineral content, while others stabilize mineral content without compromising the bulk of dentin properties. This study aimed to evaluate the effect of varying post-space dentin surface treatment methods by using sodium ascorbate SA, citric acid CA, and 970 diode laser DL on the EDX energy-dispersive X-ray spectroscopy of dentin composition after surface treatments.
Methods: 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) was treated for 15s with 10%CA then 30s with distilled water; Group (SA) was treated with 20ml 10%SA for 10min then washed 30s with distilled water; Group (DL) 970 nm were irradiated to the specimens in continuous mode for 20s:1.5W output power, 20 Hz frequency, 238.85 J/cm2. Each specimen was sectioned longitudinally in a buccolingual direction into two halves. 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, coronal, middle, and apical regions. The statistical analysis consisted of one-way ANOVA with post hoc Tukey honest significant differences test (P<0.05).
Results: Group CA showed significant mineral loss and changes in Ca, P, O, and Mg contents of root dentin (P<0.05) and an increase in C content compared with Groups CL, SA, and DL (P<0.05). SA and DL groups showed no significant changes in mineral content of Ca, P, O, and Mg (P>0.05) compared with the CL. Different root canal regions showed no difference in mineral content along the groups.
Conclusions: The chelation agent citric acid affected the mineral content of dentin. Antioxidant sodium ascorbate and diode laser did not affect dentin chemical composition.
Methods: 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) was treated for 15s with 10%CA then 30s with distilled water; Group (SA) was treated with 20ml 10%SA for 10min then washed 30s with distilled water; Group (DL) 970 nm were irradiated to the specimens in continuous mode for 20s:1.5W output power, 20 Hz frequency, 238.85 J/cm2. Each specimen was sectioned longitudinally in a buccolingual direction into two halves. 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, coronal, middle, and apical regions. The statistical analysis consisted of one-way ANOVA with post hoc Tukey honest significant differences test (P<0.05).
Results: Group CA showed significant mineral loss and changes in Ca, P, O, and Mg contents of root dentin (P<0.05) and an increase in C content compared with Groups CL, SA, and DL (P<0.05). SA and DL groups showed no significant changes in mineral content of Ca, P, O, and Mg (P>0.05) compared with the CL. Different root canal regions showed no difference in mineral content along the groups.
Conclusions: The chelation agent citric acid affected the mineral content of dentin. Antioxidant sodium ascorbate and diode laser did not affect dentin chemical composition.