“…In addition, it has been reported that adequate KTW prevents tissue prolapses during the intervals between prosthetic procedures and by preserving the junctional epithelium during functional movements of the mucosa, precludes mucogingival stress, which aids in maintenance of peri-implant tissue health. 25,26 Based on these knowledge, the purposes of this longitudinal study were the following: (1) to evaluate the effects of KTW on peri-implant tissue health by clinical, immunological, and radiological parameters; (2) to compare the results of two treatment strategies [maintenance/free gingival grafts (FGGs) + maintenance] for peri-implant sites with inadequate KTW; and (3) to determine the optimal treatment and maintenance procedures for peri-implant sites with inadequate KTW.…”