Stabilizing mandibular complete dentures by a single midline implant—influence on quality of life: 2-year results from a randomized clinical trial comparing different loading protocolsAbou-Ayash, Samir; von Maltzahn, Nadine; Passia, Nicole; Freitag-Wolf, Sandra; Reissmann, Daniel R; Luthardt, Ralph G; Mundt, Torsten; Raedel, Michael; Rammelsberg, Peter; Wolfart, Stefan; Kern, Matthias · Clinical Oral Investigations · 2019