title: Marginal bone loss around three different implant systems: radiographic evaluation after 1 year.
abstract: This study was designed to radiographically evaluate the effect of surface macro-and microstructures within the coronal portion of the external hex implant at the marginal bone change after loading. The fifty-four patients included in the study were randomly assigned to treatment groups with rough-surface implants (TiUnite, n = 45), a hybrid of smooth and rough surface implants (Restore, n = 45) or rough-surface with microthreads implants (Hexplant, n = 45). Clinical and radiographic examinations were conducted at the time of implant loading (baseline) and at 1-year post-loading. A three-level mixed-effect ancova was used to test the significance of the mean marginal bone change of the three implant groups from baseline to 1-year follow-up. At 1-year, significant differences were noted in marginal bone loss recorded for the three groups (P < 0.0001). The rough surface with microthread implants had a mean crestal bone loss of 0.42 +/- 0.27 mm; the rough surface implants, 0.81 +/- 0.27 mm; and the hybrid surface implants, 0.89 +/- 0.41 mm. Within the limitations of this study, a rough surface with microthreads at the coronal part of implant maintained the marginal bone level against functional loading better than implants without these two features.
authors.affiliation: Department of Prosthodontics & Dental Research Institute, School of Dentistry, Seoul National University, Seoul 110-768, Korea.
authors.forename: C M
authors.initials: CM
authors.lastname: Piao
authors.forename: J E
authors.initials: JE
authors.lastname: Lee
authors.forename: J Y
authors.initials: JY
authors.lastname: Koak
authors.forename: S K
authors.initials: SK
authors.lastname: Kim
authors.forename: I C
authors.initials: IC
authors.lastname: Rhyu
authors.forename: C H
authors.initials: CH
authors.lastname: Han
authors.forename: Y
authors.initials: Y
authors.lastname: Herr
authors.forename: S J
authors.initials: SJ
authors.lastname: Heo
mesh_terms: D000328:Adult; D000368:Aged; D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging* / Q000601:surgery; D000539:Alveolar Process / Q000000981:diagnostic imaging* / Q000601:surgery; D000704:Analysis of Variance; D020099:Coated Materials, Biocompatible / Q000737:chemistry; D003758:Dental Implantation, Endosseous / Q000379:methods; D019232:Dental Restoration Failure; D005260:Female; D006801:Humans; D008297:Male; D008334:Mandible / Q000000981:diagnostic imaging* / Q000601:surgery; D008437:Maxilla / Q000000981:diagnostic imaging* / Q000601:surgery; D008875:Middle Aged; D016348:Osseointegration / Q000502:physiology*; D011859:Radiography; D013499:Surface Properties
chemical_list: D020099:Coated Materials, Biocompatible