Table 2.

Excluded studies after full‐text reading

Reason for exclusion	Author(s) (year)
Effect of smoking on peri‐implantitis.	Galindo‐Moreno et al. (2015)
Internal versus external implant connection.
Chipping of restoration material. Loosening of abutment screw.	Klotz et al. (2019)
Effect of metabolic diseases on peri‐implantitis.
Preclinical study with dogs on soft tissue healing and bone	Souza et al. (2016)
Remodeling. No focus on peri‐implant disease.
Stress distribution of bone around implants with angulated or straight abutments instead of emergence angle.	Kumar et al. (2013)
Narrative review without focus on emergence angle.	Koutouzis (2019)
Narrative review without focus on emergence angle.	Romanos et al. (2019)
Split mouth clinical trial comparing internal and external connection (no emergence angle measurements).	Pozzi et al. (2012)
Narrative review discussing emergence profile and implant‐abutment connection, no focus on emergence angle.	Dixon and London (2019)
The narrative review, addresses the emergence angle in relation to soft tissue stability and convexity of restoration, focusing on the emergence angle in relation to implant position only.	Scutellà et al. (2015)
Narrative review, discussing design features of the implant‐prosthesis‐abutment complex	Mattheos et al. (2021)