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The effect of calcium hydroxide on dentine composition and root fracture resistance of human teeth: An in vitro study
Author(s) -
AlHiyasat Ahmad S.,
ElFarraj Hamza S.,
Alebrahim Mohammad A.
Publication year - 2021
Publication title -
european journal of oral sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.802
H-Index - 93
eISSN - 1600-0722
pISSN - 0909-8836
DOI - 10.1111/eos.12798
Subject(s) - crystallinity , calcium hydroxide , chemistry , fourier transform infrared spectroscopy , fracture (geology) , nuclear chemistry , dentistry , scanning electron microscope , calcium , materials science , composite material , medicine , crystallography , organic chemistry , physics , quantum mechanics
The purpose of this study was to evaluate the effect of calcium hydroxide [Ca(OH) 2 ] on dentine composition and root fracture resistance. Root canals of fifty extracted mandibular premolars were prepared and divided into five groups (N = 10). Canals were filled with non‐setting Ca(OH) 2 or left empty and were subsequently stored in phosphate buffered saline for 7, 14, 30, or 90 days, respectively. Ca(OH) 2 was then washed out, and roots were separated from the crowns and subjected to fracture strength test. Fractured fragments were examined by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and X‐ray diffraction (XRD). The results showed a significant and progressive reduction in fracture resistance the longer the duration of exposure to Ca(OH) 2 , and the fracture resistance in teeth exposed for 90 days was significantly lower than in any other group. SEM revealed cracks in the dentine surfaces that had been exposed to Ca(OH) 2 . FTIR showed a significantly lower mineral to matrix ratio in roots exposed to Ca(OH) 2 for 30 and 90 days than seen in roots exposed for a shorter duration. XRD analysis revealed a reduction in dentine crystallinity. It was concluded that Ca(OH) 2 significantly reduced the fracture resistance of the roots overtime. Exposure to Ca(OH) 2 reduced the mineral to matrix ratio and crystallinity of the dentine.