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Author Spotlight: Establishing an Accurate Microhardness Testing Protocol for Craniofacial Tissues
Published on: April 26, 2024
Flexural strength and microhardness of human radicular dentin sticks after conditioning with different endodontic
Ahmed El-Banna1, Maii Y Elmesellawy2, Mohamed Ahmed Elsayed3,4
1Department of Biomaterials, Faculty of Dentistry, Ain Shams University, Cairo, Egypt.
Introduction:
The objective of this in vitro study was to examine the impact of different endodontic chelating agents on the flexural strength and microhardness of root dentin.
Materials And Methods:
Fourty dentin sticks of (1 mm × 1 mm × 12 mm) were obtained from 10 single-rooted premolars and divided into four groups (n = 10). One stick from each tooth was assigned to one of the experimental groups and was soaked in one of the experimental chelating solutions for 5 min 17% ethylenediaminetetraacetic acid (EDTA), 2.5% phytic acid (PA), 18% etidronic acid, or saline (control group). Following the 5-min soak, the sticks' flexural strength was evaluated using a 3-point loading test using the universal testing machine, and the surface microhardness was tested using a Vickers's microhardness tester.
Results:
PA (2.5%) and etidronic acid (18%) showed no significant detrimental effect on either the flexural strength or the surface microhardness of radicular dentin compared to the control. EDTA (17%) exhibited a significant drop in the flexural strength and microhardness of radicular dentin compared to the other groups.
Conclusions:
PA and etidronic acid chelators do not compromise the surface and bulk mechanical properties of radicular dentin.
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