title: Salivary Concentration of Oxidative Stress Biomarkers in a Group of Patients with Peri-Implantitis: A Transversal Study.
abstract: OBJECTIVE
  The purpose of this study was to know if peri-implantitis causes an increase in the total salivary concentration of oxidative stress markers.
  
  
  METHODS
  Seventy patients, 28 men and 42 women, 60 of them with dental implants, 30 of which had peri-implantitis and 30 were healthy. The remaining 10 were the control group: healthy subjects without implants. The average number of implants per patient was 4.70 ± 2.29 in the peri-implantitis group and 2 70 ± 2.11 in the control group. Periodontal/peri-implant variables were assessed, including bleeding index, gingival index, clinical attachment level, probing depth, presence of pockets larger than 4 and 6 mm, pain to percussion, suppuration, gingival hyperplasia or granuloma, crestal bone loss (both mesially and distally), evaluated through periapical radiography. Saliva samples from the 70 subjects were collected for measurement of malondialdehyde high performance liquid chromatography (HPLC) and myeloperoxidase (enzyme-linked immunosorbent assay analysis) concentrations.
  
  
  RESULTS
  Implants affected with peri-implantitis had an average follow-up of 26.40 ± 7.97 months. 4.12% of implants with peri-implantitis had a painful response to percussion. 2.06% showed suppuration; 25.77% had granuloma. The mean crestal bone loss in implants wtih peri-implantitis was 3.78 ± 1.17 mm. Total salivary malondialdehyde concentration in the peri-implantitis group (0.52 ± 0.37 μM/l) was slightly higher than that in the group with healthy implants (0.40 ± 0.16 μM/l) and also slightly higher than that in the group of healthy patients without implants (0.41 ± 0.79 μM/l), although the difference was not statistically significant, p value = .442. Myeloperoxidase concentration was slightly higher in the peri-implantitis group (12.32 ± 2.17 ng/ml) than in the group with healthy implants (11.54 ± 2.80 ng/ml) and the group of healthy patients without implants (11.86 ± 2.67 ng/ml), without statistically significant differences, p value = .584.
  
  
  CONCLUSIONS
  The salivary concentration of oxidative stress markers in patients with peri-implantitis and without periodontitis is not higher than that found in healthy patients.
authors.affiliation: Faculty of Medicine, University of Murcia, Murcia, Spain. marianosasi@um.es.
authors.forename: Mariano
authors.initials: M
authors.lastname: Sánchez-Siles
authors.affiliation: Faculty of Medicine, University of Murcia, Murcia, Spain.
authors.forename: Javier
authors.initials: J
authors.lastname: Lucas-Azorin
authors.affiliation: Faculty of Medicine, University of Murcia, Murcia, Spain.
authors.forename: Noemi
authors.initials: N
authors.lastname: Salazar-Sánchez
authors.affiliation: Faculty of Medicine, University of Murcia, Murcia, Spain.
authors.forename: Luis
authors.initials: L
authors.lastname: Carbonell-Meseguer
authors.affiliation: Faculty of Medicine, University of Murcia, Murcia, Spain.
authors.forename: Fabio
authors.initials: F
authors.lastname: Camacho-Alonso
mesh_terms: D005260:Female; D006801:Humans; D008297:Male; D008315:Malondialdehyde / Q000032:analysis*; D008875:Middle Aged; D018384:Oxidative Stress / Q000502:physiology*; D057873:Peri-Implantitis / Q000378:metabolism*; D009195:Peroxidase / Q000032:analysis*; D012463:Saliva / Q000737:chemistry*
chemical_list: D008315:Malondialdehyde; D009195:Peroxidase
keywords: clinical study; inflammation; peri-implantitis