Slot, Wim Maxillary overdentures supported by four or six implants in the anterior region: 5-year results from a randomized controlled trial. [electronic resource] - Journal of clinical periodontology 12 2016 - 1180-1187 p. digital Publication Type: Journal Article; Randomized Controlled Trial ISSN: 1600-051X Standard No.: 10.1111/jcpe.12625 doi Subjects--Topical Terms: Dental ImplantsDental Prosthesis, Implant-SupportedDenture RetentionDenture, OverlayFollow-Up StudiesHumansJaw, EdentulousMaxillaPatient SatisfactionTreatment Outcome