*3.1.1.4 Width of peri-implant keratinized mucosa*

The influence of keratinized tissue around implants is still a controversial issue as there is no consensus in literature regarding the long-term success of implants and the presence or absence of keratinized tissue. However, numerous studies have been conducted which revealed a relationship between lack of keratinized tissue and plaque accumulation [49–52], bone loss [49, 53], increase in soft-tissue recession [51, 52, 54], bleeding on probing [50–53], and greater gingival inflammation [50–53].
