title: Healing of marginal defects at implants placed in fresh extraction sockets or after 4-6 weeks of healing. A comparative study.
abstract: The purpose of this study was to evaluate the clinical healing of buccal marginal defects around implants placed in fresh extraction sockets or after several weeks together with barrier membranes and bone graft. Two implant placement protocols were compared: delayed-immediate sites primarily closed by a rotated (full thickness) palatal flap (RPF) at the time of tooth extraction and implantation after 4-6 weeks (Group 1, 24 patients, n = 31 implants) and immediate procedures (into fresh extraction sockets) primarily closed by a rotated split palatal flap (RSPF) (Group 2, 19 patients, n = 23 implants). One or two proximal maxillary implants were simultaneously placed. Height and width of the marginal defect were measured at the time of implant placement and after 6-8 months, at second stage surgery. For Groups 1 and 2, the mean percentage of the reduced defect height was 91.2% (+/- 9.12) and 77.4% (+/- 16.92), respectively, and the mean percentage area of the reduced defect was 97.2% (+/- 3.85) and 90.2% (+/- 9.15), respectively. Differences between groups were statistically significant. Groups were subdivided according to number of implants placed (one or two). Spontaneous implant cover screw exposure was seen only in Group 2. There was an association between the number of implants simultaneously placed and the occurrence of spontaneous exposure. The mean percentage reduction of the defect height and area was significantly smaller where there was spontaneous exposure. Significant differences were found for mean percentage reduction of the defect height and area only between the two implant subgroups within each group.
authors.affiliation: Department of Periodontology, The Maurice and Gabriela Goldschleger School of Dental Medicine, Tel Aviv University, Tel Aviv, Israel. carlos@post.tau.ac.il
authors.forename: Carlos E
authors.initials: CE
authors.lastname: Nemcovsky
authors.forename: Zvi
authors.initials: Z
authors.lastname: Artzi
authors.forename: Ofer
authors.initials: O
authors.lastname: Moses
authors.forename: Ilana
authors.initials: I
authors.lastname: Gelernter
mesh_terms: D000540:Alveolar Ridge Augmentation / Q000379:methods; D000704:Analysis of Variance; D001672:Biocompatible Materials; D018786:Bone Substitutes / Q000627:therapeutic use; D016025:Bone Transplantation; D020099:Coated Materials, Biocompatible; D003758:Dental Implantation, Endosseous / Q000379:methods; D015921:Dental Implants; D017267:Dental Prosthesis Design; D017886:Durapatite; D005500:Follow-Up Studies; D006801:Humans; D008437:Maxilla / Q000473:pathology / Q000601:surgery; D008567:Membranes, Artificial; D008875:Middle Aged; D009061:Mouth Mucosa / Q000637:transplantation; D010159:Palate / Q000601:surgery; D013223:Statistics as Topic; D013524:Surgical Flaps; D013529:Surgical Wound Dehiscence / Q000209:etiology; D014025:Titanium; D014081:Tooth Extraction; D020390:Tooth Socket / Q000473:pathology / Q000601:surgery*; D014945:Wound Healing
chemical_list: D001672:Biocompatible Materials; D018786:Bone Substitutes; D020099:Coated Materials, Biocompatible; D015921:Dental Implants; D008567:Membranes, Artificial; D017886:Durapatite; D014025:Titanium