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Immediate Versus Delayed Surgical Reconstruction of Peri-implantitis Intra-bony Defects.

The purpose of this study is to test the comparative efficacy of two surgical approaches (immediate versus delayed GBR) for the surgical reconstruction of peri-implantitis intra-bony defects in terms of the clinical, radiographical, histological, volumetric, microbiological, and patient-reported outcomes. The investigators hypothesize that in certain clinical situations, treatment of peri-implantitis intra-bony defects with the use of a compound bone grafting material (mixture of allogenic bone substitutes) and a non-resorbable barrier membrane and following a delayed approach (test group) with initial phase of defect decontamination and initial healing phase would yield superior outcomes to that of the conventional approach (control group) of defect decontamination and regeneration at the same clinical visit while also significantly enhancing patient-reported outcomes: H0: There is no difference between the two mentioned approaches in terms of the treatment outcomes. H1: There is a significant difference, favoring the delayed approach compared to the immediate reconstruction.