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Table 2 Summary of the selected studies and quality assessement

From: Occlusal rehabilitation in patients with congenitally missing teeth—dental implants, conventional prosthetics, tooth autotransplants, and preservation of deciduous teeth—a systematic review

Author Year Study type Case selection bias (homogeneity and confounders) Performance bias (fidelity to protocol) Attrition bias (loss of participants) Detection bias (reliable measures) Reporting bias (selective reporting or conflicting interests) Summary assessments
Risk of bias
Implant studies         
 Ledermann [40] 1993 Retrospect M M L M H M
 Kearns [41] 1999 ProspObs L L L L M L
 Thilander [3] 2001 ProspObs L L L L L L
 Guckes [42] 2002 ProspObs M L L L M L
 Sweeney [43] 2005 Retrospect L L L L M L
 Finnema [27] 2005 Retrospect L L M L M L
 Poggio [44] 2005 Retrospect M M M M M M
 Zarone [45] 2006 ProspObs L L L L L L
 Becelli [46] 2007 Retrospect L L L L M L
 Bergendal [20] 2008 Survey M L H M M M
 Dueled [26] 2008 Retrospect M L M L L L
 Krieger [25] 2009 Retrospect M L L M M L
 Degidi [47] 2009 RCT L L L L L L
 Creton [1] 2010 Retrospect L L M L M L
 Grecchi [15](a), [22](b) 2010 Retrospect H M M L L M
 Nissan [48] 2011 Unclear H L M M M M
 Heuberer [38] 2012 Retrospect L L L L M L
 Hosseini [49] 2013 ProspObs L L L L L L
 Zou [50] 2014 Retrospect M L L L L L
Autotransplants         14/19 L 5/19 M
 Kristersson [51] 1991 Retrospect M L L L L L
 Kugelberg [52] 1994 ProspObs M L L L L L
 Marcusson [53] 1996 ProspObs M L L L L L
 Josefsson [54] 1999 Retrospect M L M L L L
 Czochrowska [55] 2002 Retrospect H L M L L M
 Bauss [23] 2004 prospCT M L M M M M
 Jonsson [56] 2004 ProspObs M L L L M L
 Tanaka [57] 2007 Retrospect M L M L M M
 Mensink [58] 2010 Retrospect M L L L M L
 Kvint [59] 2010 Retrospect M L L L L L
 Bokelund [24] 2013 Retrospect L L L L L L
 Deciduous teeth         8/11 L 3/11 M
 Bjerklin [60] 2000 ProspObs M L M L L L
 Ith-Hansen [61] 2000 ProspObs L L L L L L
 Sletten [62] 2003 Retrospect L L M L M L
 Bjerklin [63] 2008 ProspObs M L M L L L
 Kjaer [17] 2008 Retrospect L L M L L L
 Hvaring [16] 2013 Cross section L L L L L L
Convent. Prosth.         2/6 L 4/6 M
 Hobkirk [64] 1989 Retrospect H M M L M M
 Pröbster [65] 1997 Retrospect M L M L M M
 Garnett [66] 2005 Retrospect M L M L M M
 Dueled [26] 2008 Retrospect M L M L L L
 Krieger [25] 2009 Retrospect M L L M M M
 Spinas [67] 2013 ProspObs L L L L M L
         2/6 L 4/6 M
Total n = 42 25 retrosp 14 prosp       30/42 L12/42 M