Table 3.

The description of extraction socket classifications in included studies

Study	Year of publication	Hard tissue parameters	Soft tissue parameters	Methods of assessment
Smith and Tarnow [19]	2013	Immediately placed dental implant's coverage by septal bone	N/R	N/R
Caplanis et al. [28]	2005	Affected socket walls, amount of bone loss, distance between alveolar crest and dentinoenamel junction	Periodontal biotype	Surgical template
Elian et al. [29]	2007	Buccal bone level	Facial soft tissue level	N/R
Juodzbalys et al. [30]	2008	Alveolar process height, bone beyond the apex, labial bone vertical position, buccal bone thickness, presence of lesion, intradental bone peak height, mesiodistal distance, palatal angulation necessity	Soft tissue contour, soft tissue vertical deficiency, keratinized gingiva width, papillae appearance, soft tissue colour, consistency, gingival biotype	Radiographic, visual valuation and socket sounding using periodontal probe
Chu et al. [31]	2015	Buccal bone plate level	Buccal soft tissue deficiency	N/R
El Chaar et al. [32]	2016	Buccal plate loss, periapical bone topography, interproximal bone level	Soft tissue biotype	N/R

N/R = data not reported.