Diederik Hentenaar

57 Erythritol air-polishing in non-surgical peri-implantits treatment Secondary outcomes The secondary outcome parameters were mean peri-implant SoP (%), Plq (%), PPD (mm), MBL (mm), mean full mouth periodontal BoP (%), SoP (%), Plq (%), PPD (mm) and the presence and levels of 8 classical periodontal bacterial species at the 3 month evaluation. In addition, the midbuccal implant marginal soft tissue level between baseline and 3 month follow-up (i.e., recession (REC)), and the treatment pain/ discomfort, were assessed. Success criteria The non-surgical therapy was considered successful at the 3 month evaluation when the implants demonstrated: • Implant survival • No pockets with a PPD ≥ 5mm, with or without concomitant BoP and no SOP • Absence of radiographically assessed progressive marginal bone loss Clinical assessment The clinical parameters were assessed at 6 sites per tooth and implant (e.g., mesiobuccal, buccal, distobuccal, mesiolingual, lingual and distoligual) using a Hu-Friedy PCPUNC156 periodontal probe and Shephaerds Hook Explorer EXS23. All assessments were carried out by one and the same examiner (D.H.) who was blinded regarding group allocation. The following clinical parameters were assessed binominally: BoP, visible presence of plaque and/or plaque on probing (Plq), SoP (1 = present or 0 = not present). Probing pocket depths were scored in absolute values to the nearest millimetre. To assess recession, a partial Vinyl Polysiloxane (VPS) impression (EXABITE™ II NDS, GC America Inc., Alsip, Illinois, US) was made of the suprastructure at the implant site and buccally trimmed to half way down the suprastructure (as a fixed reference point). The distance from the mid-buccal marginal mucosa to the margin of the VPS mould was assessed using a periodontal probe. In the case of an overdenture attachment system, the top of the suprastructure was taken as a fixed reference point. Peri-implant assessment took place at baseline, 3, 6, 9 and 12 months after therapy. Additional full mouth periodontal charts were made at baseline, 3 and 12 months. Radiographical assessment As approved by the Medical Ethical Committee, radiographs were taken at baseline, 3 and 12 months. To standardize the peri-apical radiographs and to assure perpendicularity (i.e., positioning of the film parallel to the long axis of the implant) the radiographs were taken using an individualized X-ray holder and paralleling technique (Planmeca Intra X-ray unit; Planmeca, Helsiniki, Finland) (Meijndert, Meijer, Raghoebar, Vissink, 2004). 3