Influence of osteopenia in autogenous bone graft healing with or without expanded polytetrafluoroethylene membranes: histologic and histomorphometric study in rats - Nascimento, Rodrigo Dias; Cardoso, Paula Elaine; De Marco, Andréa Carvalho; Lima, Luiz Antonio Pugliesi Alves de; Jardini, Maria Aparecida Neves (The international journal of oral & maxillofacial implants, 2009)