title: Long-term stability of soft tissues following alveolar ridge preservation: 10-year results of a prospective study around nonsubmerged implants.
abstract: The purpose of this study was to evaluate the long-term clinical outcomes around implants placed in sites previously augmented with demineralized bovine bone mineral with 10% collagen (Bio-Oss Collagen, Geistlich). In this prospective study, 36 consecutive, healthy patients, in need of a single-tooth extraction (incisors, canines, and premolars) and implant replacement, were included. After tooth extraction, Bio-Oss Collagen was inserted in the socket and covered either with a double layer of collagen membrane (test) or with a few drops of a flowable polylactide polymer (control). Following a healing period of 4 to 6 months, a single nonsubmerged implant surgery was performed. After cementation of a single ceramic crown, patients were asked to follow an individualized supportive periodontal therapy program. Clinical and radiographic data were obtained after prosthesis delivery (baseline) and at the 10-year follow-up visit. At the 10-year examination, two patients were lost to follow-up. All implants demonstrated healthy peri-implant soft tissues as documented by standard parameters (full-mouth plaque score, full-mouth bleeding score, local bleeding on probing) in both groups. Mean soft tissue recession (REC) was 0.39 ± 0.54 mm for the test group and 0.50 ± 0.33 mm for the control, with no significant difference between the two groups. The results of this prospective study confirmed the long-term stability of the peri-implant marginal soft tissues supported by regenerated bone by means of the described technique using Bio-Oss Collagen. If the patient is properly followed throughout time, the risk for mucosal recession is low, with < 1 mm of mean REC after 10 years.
authors.forename: Mario
authors.initials: M
authors.lastname: Roccuzzo
authors.forename: Luigi
authors.initials: L
authors.lastname: Gaudioso
authors.forename: Marco
authors.initials: M
authors.lastname: Bunino
authors.forename: Paola
authors.initials: P
authors.lastname: Dalmasso
mesh_terms: D000540:Alveolar Ridge Augmentation / Q000379:methods*; D003442:Crowns; D003758:Dental Implantation, Endosseous / Q000379:methods*; D019250:Dental Implants, Single-Tooth; D005260:Female; D005889:Gingival Recession / Q000517:prevention & control; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D008903:Minerals; D011446:Prospective Studies; D014081:Tooth Extraction; D020390:Tooth Socket / Q000601:surgery; D016896:Treatment Outcome
chemical_list: C077540:Bio-Oss; D008903:Minerals