Dental Biomaterials Department, Faculty of Dentistry, Mansoura University, 35516 El Gomhoria St., Mansoura, Egypt

N. A. El-Wassefy & N. S. Aref

Physics Department, Faculty of science, Mansoura University, 35516 El Gomhoria St., Mansoura, Egypt

F. M. Reicha

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All authors carried out the experimental study conception and design. FR helped in the experimental part of the study. NA did the data acquisition and interpretation. NE performed the statistical analysis, drafted the manuscript, and revised it critically for important intellectual content. FR had given final approval of the version to be published. All authors read and approved the final manuscript.

Correspondence to N. A. El-Wassefy.