“…However, despite some laboratory studies, clinical studies have reported that splinted and non-splinted attachments may be used without significant differences in patient satisfaction (Al-Zubeidi, Alsabeeha, Thomson, & Payne, 2012), surgical outcomes (Ma, Tawse-Smith, et al, 2016) and prosthodontic outcomes (Ma, Waddell, Atieh, Alsabeeha, & Payne, 2016). Based on the results of those clinical studies, recent systematic reviews suggest four or more implants regardless of the type of attachment on the MIO (Di Francesco, De Marco, Gironi Carnevale, Lanza, & Lanza, 2019;Sadowsky & Zitzmann, 2016).…”