US	Ultrasonography/Ultrasound Imaging
RCT	Randomized Controlled Trial
CBCT	Cone-beam computed tomography
OPG	Orthopantomogram
PRISMA	Preferred Reporting Items for Systematic Reviews and Meta-Analyses
Rob2	Risk of Bias 2
QUADAS-2	Quality Assessment of Diagnostic Accuracy Studies—version 2
JBI	Joanna Briggs Institute
HFUS	High-Frequency US
ICC	Intraclass Correlation Coefficients
CTG	Connective Tissue Graft
CAF	Coronally Advanced Flap
TUN	Tunnel Technique
STL	Standard Tessellation Language
CDV	Colour Doppler Velocity
PDI	Power Doppler Imaging
TKT	Thickness of keratinized tissue
CEJ	Cemento-enamel junction
MGJ	Mucogingival Junction
KM	Keratinized Mucosa width
MT	Mucosal Thickness
CBT	Crestal Bone Thickness
FBL	Facial Bone Level
BBD	Buccal bone dehiscence
STH	Supracrestal tissue height
STA	Soft tissue area
HSA	Hypoechoic supracrestal area
BRW	Bone ridge width
CBSQ	Crestal bone surface quality
GBR	Guided Bone Regeneration
FMT	Facial mucosal thickness