Sailer I, Mühlemann S, Zwahlen M, Hämmerle CH, Schneider D. Cemented and screw-retained implant reconstructions: a systematic review of the survival and complication rates. Clin Oral Implants Res. 2012 Oct;23 Suppl 6:163-201.
 Weber HP, Kim DM, Ng MW, Hwang JW, Fiorellini JP. Peri-implant soft-tissue health surrounding cement- and screw-retained implant restorations: a multi-center, 3-year prospective study. Clin Oral Implants Res 2006;17(4):375-9.
 Wilson TG, Jr. The positive relationship between excess cement and peri- implant disease: a prospective clinical endoscopic study. J Periodontol 2009;80(9):1388-92