ur study (hardness = 1.81-4.97 GPA, elastic modulus = 52.43-96.95 GPA) was consistent with other studies.[ 41 , 43 , 44 ] Results of our in vitro study showed that in region 2, which was affected by etching solution and demineralization and then fluorideless bonding was used, in average in 6 depths absolutely significant reduction of elastic modulus and hardness is observed in comparison to the control region and also all the other regions.
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Effects of fluoride release from orthodontic bonding materials on nanomechanical properties of the enamel around orthodontic brackets.
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