The Use of Two Bone Substitutes in Adjunct to EMD for the Treatment of One- and Two-wall Intrabony Defects.

The main aim will be to evaluate the difference in PD changes at 12-month follow-up, measured from the gingival margin to the base of the pocket, comparing periodontal regeneration using two different bone substitutes, that is bovine derived xenograft granules (BioOss® Collagen) and one resorbable sponge-like hydroxyapatite collagen matrix (OssixTM Bone), in adjunct with EMD after microsurgical flap elevation. Inclusion criteria I. Men and women over or equal to the age of 18 years II. Patients in general good health in the opinion of the principal investigator as determined by medical history and clinical examination (ASA 1 or ASA-2) III. Clinical evidence of periodontitis, with one interdental area of PPD (periodontal probing depth) ≥6mm and bleeding on probing, associated one or more one-wall or two-wall intrabony periodontal defect with an intrabony component of equal or more than 3 mm, as diagnosed by periapical radiographs and clinical evaluation (excluding third molars and distal of second molars); the defect must not affect the vestibular / buccal or the lingual support bone wall (PPD lingual or vestibular / buccal \<= 3.5 mm ) of the affected teeth. IV. Patients who already underwent stage I and stage II of periodontal therapy, as described in the EFP practice guidelines (Sanz et al., 2020), within 6 months prior to assessment for eligibility V. Patients who can understand the requirements of the study and are willing and able to comply with its instructions and sc…

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