Influence of straight versus angulated screw channel titanium bases on failure loads of two-piece ceramic and titanium implants restored with screw-retained monolithic crowns: an in-vitro study - Helal, E.; Gierthmuehlen, Petra Christine; Bonfante, Estevam Augusto; Campos, Tiago Moreira Bastos; Prott, Lea Sophia; Langner, Robert; Spitznagel, Frank Akito (Clinical Oral Implants Research, 2023)