title: Microarray expression in peri-implant tissue next to different titanium implant surfaces predicts clinical outcomes: a split-mouth study.
abstract: OBJECTIVE
  This split-mouth study evaluated miRNA expression of tissues around implants with different surface treatments.
  
  
  METHODS
  Each patient of the sample (five men and five women) received two implants (one control and one test) into an edentulous quadrant to support fixed partial dentures. The control implants (Osseotite) had a dual acid-etched (DAE) surface in the apical portion and a machined coronal part, test implants (Full Osseotite, FOSS) were completely DAE. Machined healing abutments were placed on control implants and DAE abutments on test ones. All implants were assigned codes for blinding. Standardized periapical radiographs were taken at baseline, 2 and 6 months, and 1 year after surgery. Plaque index (PI), bleeding on probing (BOP), and probing depth (PD) were recorded at 3 and 6 weeks, and 2, 3, 6, and 12 months post-implant placement. After 3 months, a mini-invasive sample of soft tissue was collected from seven patients (four women and three men) for miRNA microarray analysis.
  
  
  RESULTS
  Control implants showed greater bone resorption (BR) and lower PI: this was not statistically significant. No statistically significant differences in BOP and PD appeared. miRNA modulated by implant surfaces as well as by other clinical conditions has been identified. miRNA microarray analysis revealed that: (i) implant sites with low PI and absence of BOP had a miRNA expression profile similar to those with plaque and absence of BOP; sites with high PI and high BOP had a different profile. (ii) Implant sites with BOP presented similar profiles independently from implant surface. (iii) Implant sites with high PI and normal BR differed from others for miRNA expression profile. (iv) Implant sites with normal BR despite high BOP differed from others. This profile resembled that of FOSS implants. (v) Implant surface affected BR; groups having similar BR clusterized differently according to the implant type.
  
  
  CONCLUSIONS
  DAE surfaces induced lower BR and more plaque accumulation: This did not affect the health of soft tissues. miRNA analysis indicated that soft tissue inflammation is more related to gene expression profile than to plaque or to implant surface. Specific miRNA profile can protect implant sites from bleeding and BR irrespective of plaque accumulation.
authors: Division of Implant Prosthodontics, Department of Surgical Sciences, University of Genoa, Genoa, Italy.
authors: M
authors: M
authors: Menini
authors: Division of Implant Prosthodontics, Department of Surgical Sciences, University of Genoa, Genoa, Italy.
authors: E
authors: E
authors: Dellepiane
authors: Division of Implant Prosthodontics, Department of Surgical Sciences, University of Genoa, Genoa, Italy.
authors: D
authors: D
authors: Baldi
authors: Department of Health Sciences, University of Genoa, Genoa, Italy.
authors: M G
authors: MG
authors: Longobardi
authors: Division of Implant Prosthodontics, Department of Surgical Sciences, University of Genoa, Genoa, Italy.
authors: P
authors: P
authors: Pera
authors: Department of Health Sciences, University of Genoa, Genoa, Italy.|IRCCS AOU San Martino IST, Genoa, Italy.
authors: A
authors: A
authors: Izzotti
mesh_terms: D015921:Dental Implants; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D005260:Female; D006801:Humans; D008297:Male; D035683:MicroRNAs / Q000096:biosynthesis; D046228:Microarray Analysis; D010519:Periodontium / Q000378:metabolism*; D011237:Predictive Value of Tests; D013499:Surface Properties; D014025:Titanium; D016896:Treatment Outcome
chemical_list: D015921:Dental Implants; D035683:MicroRNAs; D014025:Titanium
keywords: dental implants; microRNA; peri-implant tissue; titanium surfaces