Table 1.

Study characteristics

Author-year	Type of study	N	N, IOI	Intervention	Follow-up
Chandra et al. 2019 [10]	Non randomized comparative clinical study	34	34	Autogenous bone ring (chin) (BR group) vs sticky bone + collagen membrane (SB group) IOI at 6 months	6 months
Flanagan et al. 2016 [17]	Case series	8	8	Allogenic bone ring + IOI + allograft + collagen membrane	1 year
Fukuda et al. 2005 [18]	Case series	9	13	Autogenous bone ring (chin) + IOI	3.1 years
Giesenhagen et al. 2018 [19]	Case report	1	1	Allogenic bone ring + IOI + collagen membrane	6 months
Giesenhagen et al. 2019 [20]	Case series	3	7	Allogenic bone ring + IOI + collagen membrane	36 months
Giraddi et al. 2017 [21]	Prospective study	14	15	Autogenous bone ring (chin) + IOI + PRF membrane	9 months
Miller J. 2019 [22]	Case report	1	1	Allogenic bone ring + xenograft + IOI + collagen membrane	6 months
Nord et al. 2019 [23]	Retrospective study	51	81	Allogenic bone ring + autogenous bone chips + IOI + collagen membrane	12 months
Omara et al. 2016 [24]	Prospective study	10	12	Autogenous bone ring (chin) + IOI	6 months
Peñarrocha et al. 2005 [25]	Case report	1	3	Autogenous bone ring (ramus) + IOI	2 years
Rizzo et al. 2017 [26]	Case series	4	4	Crestal sinus floor elevation with autogenous bone ring (chin) and simultaneous IOI	3 years
Sindel et al. 2018 [27]	Retrospective study	10	10	Sinus floor elevation with autogenous bone ring (chin) and simultaneous IOI	24.3 months
Stevenes et al. 2010 [28]	Case report	1	4	Autogenous bone ring (chin) + IOI	6 months
Tekin et al. 2011 [29]	Case report	1	1	Autogenous bone ring (chin) + IOI	1 year
Wychowansky et al. 2020 [11]	Non randomized comparative clinical study	30	60	Autogenous bone ring (chin) + simultaneous IOI (BR group) vs xenograft tunnel (XG group) and delayed IOI after 6m	24 months
Yuce et al. 2019 [12]	Prospective study	8	12	Autogenous bone ring (chin) + IOI	18 months

N number, IOI implant, PRF platelet-rich fibrin