Study Soft tissue parameters Hard tissue parameters Prosthetic restoration parameters Prognostic value parameters
Juodzbalys and Wang [2] CEI: S index:
-Soft tissue contour variations;
-Soft tissue vertical deficiency;
-Soft tissue colour and texture variations;
-Mesial papillae appearance;
-Distal papillae appearance 		None R index:
-Colour and translucency;
-Labial convexity in the abutment/implant junction;
-Implant/crown incisal edge position;
-Crown width/length ratio;
-Surface roughness and ridges 		P index:
-Mesial interproximal bone height;
-Distal interproximal bone height;
-Gingival tissue biotype;
-Implant apico-coronal position;
-Horizontal contour deficiency
Meijer et al. [28] -Labial margin;
-Papillae;
-Contour of the labial surface;
-Colour and surface 		None -Width;
-Length;
-Labial convexity;
-Colour/translucency;
-Surface;
-Mesio-distal dimension;
-Position of the incisal edge 		None
Belser et al. [29] PES:
-Mesial papilla;
-Distal papilla;
-Alveolar process;
-Soft-tissue texture;
-Contour;
-Colour;
-Level of the soft tissue margin 		None WES:
-General tooth form;
-Outline of the clinical crown;
-Volume of the clinical crown;
-Colour and translucency;
-Texture;
-Characterization 		None
Hosseini and Gotfredsen [30] CIS:
-Mucosal discoloration;
-Mesial papilla;
-Distal papilla 		None -Crown morphology;
-Crown colour match;
-Symmetry/harmony 		None
Tettamanti et al. [31] PICI:
-Papillae;
-Zenith;
-Root convexity 		None -Shape;
-Colour;
-Characterization 		None

S = soft-tissue index; PES = pink aesthetic score; CEI = complex aesthetic index; PICI = peri-implant and crown index; WES = white aesthetic score; R index = restoration index; P index = predictive index.