title: The effect of keratinized mucosa width on peri-implant health: a systematic review.
abstract: OBJECTIVE
  The aim of this systematic review was to investigate the effect of keratinized mucosa width (KMW) on clinical parameters of peri-implant health and stability.
  
  
  METHODS
  Two independent reviewers conducted a comprehensive search to identify studies on human subjects reporting KMW as a bivariate factor (≥ 2 mm and < 2 mm), along with mean pocket depth (PD), bleeding on probing (BOP), modified Bleeding Index (mBI), Gingival Index (GI), Plaque Index (PI), modified PI (mPI), and implant survival with a minimum follow-up of 6 months after implant loading. Eight studies were included in the systematic review and seven in the metaanalyses to ascertain summary effects for differences in the aforementioned parameters among groups of KMW.
  
  
  RESULTS
  Pooled analyses showed that GI, PI, and mPI were significantly higher in the group with KMW of < 2 mm, while mBI was also higher but only marginally significant. In contrast, PD was not significantly different between the two groups. Differences in BOP and implant survival rate could not be analyzed because of limited data availability. Heterogeneity was highly significant among the pooled studies for all investigated variables.
  
  
  CONCLUSIONS
  Reduced KMW around implants appears to be associated with clinical parameters indicative of inflammation and poor oral hygiene. However, based on the selected evidence, the predictive value of KMW is limited.
authors.forename: Luca
authors.initials: L
authors.lastname: Gobbato
authors.forename: Gustavo
authors.initials: G
authors.lastname: Avila-Ortiz
authors.forename: Keyvan
authors.initials: K
authors.lastname: Sohrabi
authors.forename: Chin-Wei
authors.initials: CW
authors.lastname: Wang
authors.forename: Nadeem
authors.initials: N
authors.lastname: Karimbux
mesh_terms: D015921:Dental Implants; D003774:Dental Plaque Index; D019232:Dental Restoration Failure; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009061:Mouth Mucosa / Q000033:anatomy & histology*; D009909:Oral Health; D009911:Oral Hygiene Index; D010512:Periodontal Index
chemical_list: D015921:Dental Implants