Nowadays, both the characteristics and the quantity of peri-implant soft tissue around dental implants are acknowledged to be of significance for the maintenance of peri-implant healthy tissues and successful esthetic outcomes.
Although a recent preclinical study showed that a buccal bone thickness >1.5 mm is necessary to minimize bone resorption after implant insertion (Monje et al., 2019), there is limited clinical evidence regarding the minimum bone thickness required to obtain predictable stability, esthetics, and health of the peri-implant soft tissues (Avila-Ortiz et al., 2020).
n recent years, the impact of KM width (i.e., distance from the mucosal margin to the mucogingival junction) and buccal soft tissue thickness (STT) (i.e., horizontal mucosal thickness) on the maintenance of peri-implant health has been addressed in some systematic reviews (Tavelli et al., 2020; Thoma et al., 2018). Although a few authors have found that the absence of KM is not directly associated with worse peri-implant conditions (Chung et al., 2006; Wennström et al., 1994), others have observed higher plaque levels, mucosal inflammation, marginal bone loss, and brushing discomfort (Monje & Blasi, 2019; Perussolo et al., 2018; Roccuzzo et al., 2016) at sites with lack of adequate KM.
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