“…In order to use these instruments, there is a need for cross-cultural adaption and validation of the methodology [ 26 ]. A number of previous studies have examined OHRQoL in OLP patients [ 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 ]. Most studies were conducted with the cross-sectional design.…”