Seven-year follow-up of full-arch prostheses supported by four implants: a prospective study - Ayub, Karen Vaz; Ayub, Eduardo Antônio; Valle, Accacio Lins do; Bonfante, Gérson; Pegoraro, Thiago; Pegoraro, Luiz Fernando (The International Journal of Oral & Maxillofacial Implants, 2017)