ACL	Anatomical crown length
AI	Artificial intelligence
APE	Altered passive eruption
BC	Bone crest
BT	Bone thickness
CBCT	Cone-beam computed tomography
CCL	Clinical crown length
CEJ–BC	Distance from the CEJ to bone crest
CEJ	Cemento-enamel junction
CW	Crown width
CW/ACL	Crown width/Anatomical crown length ratio
CW/CCL	Crown width/Clinical crown length ratio
CW/CL	Crown width-to-length ratio
DICOM	Digital Imaging and Communications in Medicine
ECL	Esthetic crown lengthening
GD	Gingival display
GM	Gingival margin
GM–CEJ	Distance from gingival margin to cemento-enamel junction
GT	Gingival thickness
GT–CEJ	gingival thickness measured at cemento-enamel junction
HUL	Hypermobile upper lip
ICC	Intraclass correlation coefficient
KTW	Keratinized tissue width
MGJ	Mucogingival junction
OHRQoL	Oral health–related quality of life
PGD	Predicted gingival display
SDs	Standard deviations
STROBE	Strengthening the Reporting of Observational Studies in Epidemiology
STL	Standard tessellation language