1 Kajiwara N, Masaki C, Mukaibo T, Kondo Y, Nakamoto T, Hosokawa R (2015). Soft tissue biological response to zirconia and metal implant abutments compared with natural tooth: microcirculation monitoring as a novel bioindicator. Implant Dent 24(1):37-41.
2 Glauser R, Sailer I, Wohlwend A, Studer S, Schibli M, Schärer P. Experimental zirconia abutments for implant-supported single-tooth restorations in esthetically demanding regions: 4-year results of a prospective clinical study. Int J Prosthodont. 2004 May-Jun;17(3):285-90.
3 Liñares A, Grize L, Muñoz F, Pippenger BE, Dard M, Domken O, Blanco-Carrión J. Histological assessment of hard and soft tissues surrounding a novel ceramic implant: a pilot study in the minipig. J Clin Periodontol. 2016 Jun;43(6):538-46.
4 Degidi M, Artese L, Scarano A, Perrotti V, Gehrke P, Piattelli A. Inflammatory infiltrate, microvessel density, nitric oxide synthase expression, vascular endothelial growth factor expression, and proliferative activity in peri-implant soft tissues around titanium and zirconium oxide healing caps. J Periodontol. 2006 Jan;77(1):73-80.
5 Institut Straumann AG, Straumann® PURE Ceramic Implants: A 100 % proof test ensures reliable implant strength. 03/14 490.028/en/B/001. www.straumann.com
6 Bormann KH, Gellrich NC, Kniha H, Dard M, Wieland M, Gahlert M. Biomechanical evaluation of a microstructured zirconia implant by a removal torque comparison with a standard Ti-SLA implant. Clin Oral Implants Res. 2012 Oct;23(10):1210-6. doi: 10.1111/j.1600-0501.2011.02291.x. Epub 2011 Nov 14.
7 Gahlert M, Roehling S, Sprecher CM, Kniha H, Milz S, Bormann K. In vivo performance of zirconia and titanium implants: a histomorphometric study in mini pig maxillae. Clin Oral Implants Res. 2012 Mar;23(3):281-6. doi: 10.1111/j.1600-0501.2011.02157.x.
8 Gahlert M, Röhling S, Wieland M, Eichhorn S, Küchenhoff H, Kniha H A comparison study of the osseointegra¬tion of zirconia and titanium dental implants. A biomechanical evaluation in the maxilla of pigs Clin Implant Dent Relat Res. 2010 Dec;12(4):297-305. Doi: 10.1111/j.1708-8208.2009.00168.x
9 Bormann KH, Gellrich NC, Kniha H, Schild S, Weingart D, Gahlert M. A Prospective Clinical Study to Evaluate the Performance of Zirconium Dioxide Dental Implants in Single Tooth Gaps in the Maxilla and Mandible: 3-Year Results. Publication in preparation 2017.
10 Roehling S, Engelhardt-Woelfler H, Gahlert M. Full ceramic implants as an alternative to titanium? A demographic evaluation in Switzerland and Germany. Publication in preparation 2017.
11 Schlömer G et al. Zirconium dioxide implants: An alternative to titanium? A clinical assessment MED 2009; 01/09: 1
12 Mellinghoff J, Cacaci C, Detsch F Einteilige Keramikimplantate Eine Longitudinalstudie über zwei Jahre Beobachtungsdauer. Implantologie 23(1):89-100
13 Cumulated survival rate derived from Z-systems complaint statistics
14 Hoffmann O, Angelov N, Zafiropoulos GG, Andreana S. Osseointegration of zirconia im-plants with different surface characteristics: an evaluation in rabbits. Int J Oral Maxillofac Implants. 2012 Mar-Apr;27(2):352-8. 
15 Sennerby L, Dasmah A, Larsson B, Iverhed M. Bone tissue responses to surface-modified zirconia implants: A histomorphometric and removal torque study in the rabbit. Clin Implant Dent Relat Res. 2005;7 Suppl 1:S13-20.
16 Hashim D, Cionca N, Courvoisier DS, Mombelli A. A systematic review of the clinical survival of zirconia implants. Clin Oral Investig. 2016 Sep;20(7):1403-17.
17 Roehling S, Schlegel KA, Woelfler H, Gahlert M. Performance and outcome of zirconia dental implants in clinical studies: A meta-analysis. Clin Oral Implants Res. 2018 Oct;29 Suppl 16:135-153
18 Kniha K, Schlegel KA, Kniha H, Modabber A, Hölzle F, Kniha K Evaluation of peri-implant bone levels and soft tissue dimensions around zirconia implants-a three-year follow-up study. Int J Oral Maxillofac Surg. 2018 Apr;47(4):492-498 connection implants using different torque values: an in vitro study. Implant Dent. 2014 Apr;23(2):175-9.