Chronology of alveolar healing following immediate implantation of ricinus communis polyurethane resin: histometric analysis in rats - Lamano Carvalho, Teresa Lúcia; Teófilo, Juliana M; Araújo, Cláudia Andréa Cavalcanti de Albuquerque; Brentegani, Luiz Guilherme (Journal of Biomedical Materials Research, 1997)