"Inclusion criteria";"Exclusion criteria"
"Age between 18 and 65 years";"Age under 18 and over 65 years old"
"Presence of maxillary diastema";"Presence of periodontal disease"
"Intact frontal teeth";"Presence of erosion, attrition, and abrasion on the frontal maxillary teeth"
"Physiological occlusion";"Pathological occlusion"
"Caucasian race";"Negroid or Mongoloid race"
"Absence of parafunctions";"Presence of parafunctions"
"Absence of systemic diseases";"Presence of systemic diseases"