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Effect of different healing abutment materials on parameters of peri-implant infections
EAO Online Library. Theisen K. 10/09/18; 232606; P-BR-58
Kerstin Theisen
Kerstin Theisen
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In addition to zirconia-based and titanium-based materials, research is increasingly being conducted on polymethylmethacrylate (PMMA) as a material for fixed dentures or healing abutments. Studies showed that the mechanical properties of PMMA fixed dentures have superior mechanical properties compared to conventional fixed dentures (Alt et al. 2011, Stawarczyk et al. 2012). The effects of healing abutments with PMMA surfaces on parameters of peri-implant infections have not been investigatedAim of this prospective study was to compare the effect of different abutments materials (Ti, Zr, PMMA) on parameters of peri-implant infections. The hypothesis was that there is no difference in clinical and histological parameters.In the present clinical study, 30 two-piece titanium implants were inserted in single-tooth gaps of 30 patients. After a submerged healing period of 3 months, the subjects received healing abutments made of titanium, zirconia or PMMA (group 1-3). Permanent all-ceramic restoration was performed 6 months after surgery for the Ti and Zr group. The PMMA group received a provisional PMMA restoration.**The following parameters were evaluated-**- The inflammatory response mediated by MMP-8 level in peri-implant sulcus fluid adjacent to the different materials.**- Sensitive and reliable parameters of peri-implant infections as pocket probing depths (PPD), bleeding on probing (BOP), plaque index (PI), and radiographic interpretation of single-tooth x-ray for measuring marginal bone loss (MBL).**- Patient satisfaction.Assessment at baseline (placement of healing abutments) and follow-ups after 2 weeks, 2, 3, 6, 12, and 15 months revealed no significant differences in MMP-8 level and in clinical parameters (PPD, BOP, PI, MBL) between the three groups. Patient satisfaction revealed that zirconia and PMMA as abutment material were favorable over titanium.**The MMP-8 levels showed that titanium had the highest values at each examination date followed by PMMA and zirconia. All mean values were below 10 ng ml, whereas values of 8 ng ml are considered as healthy. In all groups, PPD, BOP, PI, and MBL were similar.**The results showed that clinical parameters were comparable to the results of other publications. Thus, all materials seem appropriate as healing abutments concerning biological complications. Further long-term investigations are necessary prior to application of PMMA as abutment material.
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