Mejía, P. and Monterrsa, M. 2015. Comparison of the degree of coronal pigmentation in extracted premolars after the application of Bi-antibiotic and Tri-antibiotic pastes. Journal of Oral Research. 4, 2 (Mar. 2015), 116-123. DOI:https://doi.org/10.17126/joralres.2015.024.