Table 2 Clinical studies included : To what extent residual alveolar ridge can be preserved by implant? A systematic review

author: Ahmed Khalifa Khalifa, Masahiro Wada, Kazunori Ikebe, Yoshinobu Maeda | publisher: drg. Andreas Tjandra, Sp. Perio, FISID

	Patients		Intervention			Follow-up	Outcome		Study
Reference	No.	Age^a	No. of implants	Position	Supra-structure		Change	Declarations	Study
(DAVIS et al. 1999) [17]	44	61.2	NG	Symphyseal	Fixed	6.6 Y^a	VBH (−.8 to +3.3 mm)	–	R
(Powers et al. 1994) [32]	146	52	NG	TMI	Fixed	18–51 M	BF (+2 to 9 mm)	–	R
(Adell et al. 1981) [58]	410	53	2768	NG	Removable bridges	5–9 Y	BR (+)	–	R
(Mericske-Stern et al. 2002) [35]	41	61.2	4–6	Maxillary	Removable overdentures	4.1 Y^a	BD (+)	Associated with radiographically visible decrease of the crestal bone.	P
(Kwakman et al. 1997) [31]	36	60	NG	TMI	Denture with cantilever extension	2.3 Y^a	BF (+)	–	R
(Sennerby et al. 1988) [72]	41	51.3	NG	Symphyseal	Oerdenture	7.1 Y^a	BR (−)	Implant bony area vs CD	R
(Friberg et al. 2000) [20]	49	63	247	NG	Fixed prosthesis	8 Y^a	BF (+)	At two most distal implants	R
(Adell et al. 1986) [19]	16	53	95	Maxillomandibular	Removable bridge	3 Y^a	BR (+)	Indicating a successive load-related remodeling	P
(Kordatzis et al. 2003) [74]	150	NG	300	Symphyseal	Bar overdenture	5 Y^a	BR (−1 mm)^a	Less bone atrophy with OD vs CD.	R
(Woven & Gotfredsen 1998) [78]	22	65	NG	Symphyseal	Overdentures	5 Y^a	BF (+) BR (−)	Function related BF vs physiologic age-related BR	P
(Wright et al. 2002) [73]	44	53 Y, for overdenture and 64 Y for the fixed prosthesis	NG	NG	Overdentures and fixed prostheses	7.5 Y^a	BR (−0.5 mm)^a BF (+0.5 mm)^a	OD and FD, respectively	R
(Shaarawy & Aboelross 2013) [92]	14	58	14 + 28	Symphyseal and 2 in the first molar area	Overdenture	1 Y	BD (+)	Incisal reduction of BD followed by gradual increase in BD	P
(Taylor 1989) [21]	1	50 Y (not a mean)	5	NG	Fixed	32 M	VBH (3 mm)	–	CR
(Oikarinen & Siirila 1992) [60]	1	41 Y	6	NG	Fixed	8 Y^a	VBH (+)	Nearly the doubled new BF	CR
(Betts et al. 1993) [18]	19	NG	NG	TMI	Fixed	53 M	VBH (+1.8 mm)^a	In the saddle area and the most distal screw	R
(Dhima et al. 2013) [33]	81	NG	NG	NG	Fixed	9^a	BF (+0.94 mm)^a	–	R
(Mosnegutu et al. 2015) [81]	82	NG	NG	NG	Overdenture	10.5 Y^a	BR (±)	No relevant posterior bone atrophy after loading	P
(Cooper et al. 2008) [79]	59	NG	118	Parasymphyseal	Overdenture	60 M	BF (+)	–	P

Table 2 Clinical studies included

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