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ABS TRACT Objective: To investigate the effects of boric acid, EDTA and citric acid on rootdentin mineral content and on shear-bond strength of AH Plus. Material and Methods: Eighteen extracted mandibular premolars were used. The crowns were removed. The roots were then longitudinally sectioned under water cooling to obtain two root halves from each tooth. Element levels were examined by SEM-EDX and build-ups were created using AH Plus. The element levels and shear-bond strength data (MPa) were recorded. After shear-test, the root surfaces were re-grounded, and subjected to 5,25% NaOCl followed by 10% Boric acid, 17% EDTA and 10% Citric acid. The root surfaces were re-examined by SEM-EDX. Shear-test was repeated. The element levels and shear-bond strength data (MPa) were recorded and analyzed by using paired samples t test. Results: Boric acid increased O, Na, K and Ca/P ratio (p<0.001), did not change Ca, C, Mg contents of root-dentin (p>0.05). EDTA increased O, Na, C, Ca/P ratio (p<0.001), decreased the Ca, P, S (p<0.001). Citric acid increased C, Na, Ca/P ratio (p<0.001), decreased Ca, P, S contents (p<0.05). Citric acid did not change shear-bond strength of AH Plus (p=0.218). Both Boric acid and EDTA treatment decreased shear bond strength of the sealer (p=0.000). Conclusion: All the tested materials changed the mineral contents of root dentin. Boric acid and EDTA treatment decreased shear bond strength of AH Plus. Boric acid might be considered as an alternative chelating agent however further experimental and clinical evaluations are needed to use the material safely.

The Effect of Boric Acid on Root Dentin Mineral Content and Bond Strength of AH-Plus: A SEM-EDX Study