Lippia sidoides and Myracrodruon urundeuva gel prevents alveolar bone resorption in experimental periodontitis in rats - Botelho, M A; Rao, V S; Carvalho, C BM; Bezerra-Filho, J G; Fonseca, S GC; Vale, M L; Montenegro, D; Cunha, F; Ribeiro, R A; Brito, G A (J Ethnopharmacol, 2007)