Table 2.

Data of interest.

	Author, year	Study design	Sample size (M/F)	Mean age (SD), Range (years)	Groups (n)	Eligible outcome
1.	Tadinada et al., 2015 [15]	RS Split-mouth	39 (16/23)	17.07 (−)12–29	SI: impacted side [39] SC: controlside [39]	• Anterior height of alveolar crest (AACH) • Buccolingual width of the alveolar ridge • Arch perimeter
2.	Sar et al., 2022 [16]	RS Split-mouth	30 (13/17)	19.8 (3.3) –	SI: impacted side [15] SC: controlside [15]	• Anterior height of alveolar crest (AACH) • Anterior dentoalveolar height (ADH) • Basal lateral width • Basal first premolar width (BPMW)
3.	D´Oleo-Aracena et al., 2017 [17]	RS Split-mouth	28 (11/17)	M 22.09 (4.70) F 23.12 (5.17) –	SI: impacted side [28] SC: controlside [28]	• Anterior height of alveolar crest (AACH) • Anterior dentoalveolar height (ADH) • Basal lateral width • Basal first premolar width (BPMW)
4.	Montes-Díaz et al., 2022 [18]	RS	100 (G1:21/29;G2:23/27)	32.8 (9.16) 20–45	GI (SI/SC): unilateral PIC [50] GC: control patients [50]	• Anterior height of alveolar crest (AACH) • Basal maxillary width (JL-JR) • Arch length
5.	Genc and Karaman, 2022 [19]	RS	30 (G1: 8/7G2:7/8)	15.82 (1.62) 13–18	GI:unilateralPIC [15] GC: control patients [15]	• Basal maxillary width (ML-MR) • Basal first premolar width (BPMW) • Palatal vault depth • Alveolar first premolar width (APMW) • Alveolar first molar width (AMW)
6.	Yan et al., 2013 [4]	RS	138 (–)	– 12–30	GI:unilateral/bilateralPIC (69) GC: matched controls (69)	• Basal maxillary width (JL-JR) • Alveolar first molar width (AMW) • Alveolar first premolar width (APMW)
7.	Hong et al., 2015 [20]	RS	85 (G1: 11/22;G2: 22/44)	18.2 (–) 10–42	GI: unilateral/bilateral PIC [33] GC: matched controls (66)	• Basal maxillary width (ML-MR) • Basal first premolar width (BPMW) • Alveolar first molar width (AMW) • Alveolar first premolar width (APMW)
8.	Arboleda-Ariza et al., 2018 [21]	RS	92(–)	G1 23.1 (10.6) G2 26.5 (6.05)	GI: unilateral PIC [25] GC: control patients (67)	• Basal maxillary width (ML-MR) • Basal first premolar width (BPMW) • Alveolar first molar width (AMW) • Alveolar first premolar width (APMW)
9.	Elhamshary et al., 2023 [22]	RS	60 (–/–)	– (–) 15–60	GI: unilateral PIC [20] GC: control patients [20]	• First premolar width (APMW) • First molar width (AMW) • Basal first molar width (BMW)

RS, retrospective study; GI, impactiongroup; GC, controlgroup; SI, impactedside; SC, controlside; (-), not defined.