Mean values for all variables for mesial and distal aspect of each implant.

*<p>Implant: 1 =  case implant; 0 =  control implant.</p>**<p>Similar variances are assumed.</p><p>Change Variable (Distal or Mesial) =  Initial mean value – Final mean value.</p><p>Reduced Variable (Distal or Mesial)  =  (Initial mean value – Final mean value)/Initial mean value.</p

Digital micrographs for the control implants.

<p>(1) and coated implants (2 and 3). (a) week 24 and (b) week 36. A picture showing the intermediate 2 mm height machine titanium surface abutment has been inserted. The distance between the abutment-fixture junction (A/F) and the marginal position of bone-to-implant contact (B) is shown.</p

Images for the control implant

<p>(<b>1</b>) <b>and for the coated implants</b> (<b>2 and 3</b>)<b>.</b> (<b>a</b>) <b>week 25 and</b> (<b>b</b>) <b>week 36.</b></p

Scanning electron micrographs of the surface for

<p>(<b>a</b>) <b>titanium implant and</b> (<b>b</b>) <b>coated/nAg titanium implant.</b></p

Scanning electron micrographs at different magnifications of cross section of the abutment.

<p>Scanning electron micrographs at different magnifications of cross section of the abutment.</p

Digital radiographs of implants at the beginning of the plaque formation period in week 24 (A) and at the end of the study in week 46 (B).

<p> Differences in crestal bone level are evident. 1. Uncoated zirconia abutment, 2. G3 glassy coated abutment, 3. ZnO35 coated abutment, 4. G1n-Ag coated abutment.</p

Outline of the study.

<p>This figure describes the actions conducted during the principal phases of this study. The preparatory period consisted in dental extractions, a healing period, dental implants installation, abutments connection and a plaque control regimen. During passive breakdown period all plaque control activities were stopped and afterwards, peri-implantitis was additionally induced by intrasulcular placement of cotton ligatures during an active breakdown period. PC- Plaque Control. PF- Plaque Formation.</p

Scanning electron micrographs showing the surface of the glassy coatings: A) G3, C) ZnO35, E) G1n-Ag, and the cross section: B) G3, D) ZnO35 and F) G1n-Ag.

<p>Scanning electron micrographs showing the surface of the glassy coatings: A) G3, C) ZnO35, E) G1n-Ag, and the cross section: B) G3, D) ZnO35 and F) G1n-Ag.</p

Transversal sections of implants at the end of the study in week 48.

<p>After a passive plaque formation period and an active ligature induce peri-implantitis period: A) An implant wearing uncoated zirconia abutment shows a bone resorption process that forms a crater defect and reduces bone-to-implant contact level to the macro-threads zone of the implant. B) An implant wearing G3 glassy coated zirconia abutment undergoes an evident lesser bone loss limited to the micro-threads zone and does not display the typical crater shape bone defect associated with active peri-implantitis.</p

Scanning electron micrographs at different magnifications of: A and B) uncoated zirconia abutment, C and D) G3 glassy coated zirconia abutment, E and F) ZnO35 coated zirconia abutment, G and H) G1n-Ag coated zirconia abutment.

<p>Scanning electron micrographs at different magnifications of: A and B) uncoated zirconia abutment, C and D) G3 glassy coated zirconia abutment, E and F) ZnO35 coated zirconia abutment, G and H) G1n-Ag coated zirconia abutment.</p