An in vitro study of non-axial forces upon the retention of an O-ring attachment - Rodrigues, Renata Cristina Silveira; Faria, Adriana Cláudia Lapria; Macedo, Ana Paula; Sartori, Ivete Aparecida de Mattias; Mattos, Maria da Glória Chiarello de; Ribeiro, Ricardo Faria (Clinical Oral Implants Research, 2009)