title: A 3-year prospective radiographic evaluation of marginal bone level around different implant systems.
abstract: The aim of this study was to evaluate the change of marginal bone level radiographically around three different implant systems after 3 years in function. Fifty-four patients were included and randomly assigned to three treatment groups of rough-surface implants (TiUnite, n = 37), hybrid of smooth and rough-surface implants (Restore, n = 38) and rough surface with microthread implants (Hexplant, n = 45). Clinical and radiographic examinations were conducted at the time of implant loading (baseline), 1 and 3 years after loading. A three-level mixed-effect analysis of covariance (ancova) was used to test the significance of the mean marginal bone change of the three implant groups. A total 120 of 135 implants completed the study. None of the implants failed to integrate. Significant differences were noted in the marginal bone loss recorded for the three groups (P < 0.0001). At 3 years, the rough surface with microthread implants had a mean crestal bone loss of 0.59 +/- 0.30 mm; the rough-surface implants, 0.95 +/- 0.27 mm; and the hybrid surface implants, 1.05 +/- 0.34 mm. Within the limitations of this study, rough-surface implants with microthread at the coronal part might have a long-term positive effect in maintaining the marginal bone level against functional loading in comparison with implants without these two features.
authors.affiliation: Department of Prosthodontics & Dental Research Institute, School of Dentistry, Seoul National University, Jongno-gu, Seoul, Korea.
authors.forename: S Y
authors.initials: SY
authors.lastname: Lee
authors.forename: C M
authors.initials: CM
authors.lastname: Piao
authors.forename: J Y
authors.initials: JY
authors.lastname: Koak
authors.forename: S K
authors.initials: SK
authors.lastname: Kim
authors.forename: Y S
authors.initials: YS
authors.lastname: Kim
authors.forename: Y
authors.initials: Y
authors.lastname: Ku
authors.forename: I C
authors.initials: IC
authors.lastname: Rhyu
authors.forename: C H
authors.initials: CH
authors.lastname: Han
authors.forename: Seong-Joo
authors.initials: SJ
authors.lastname: Heo
mesh_terms: D000328:Adult; D000368:Aged; D016301:Alveolar Bone Loss / Q000145:classification / Q000000981:diagnostic imaging*; D000539:Alveolar Process / Q000000981:diagnostic imaging*; D002130:Calcium Phosphates / Q000737:chemistry; D020099:Coated Materials, Biocompatible / Q000737:chemistry; D000044:Dental Abutments; D045662:Dental Etching; D003758:Dental Implantation, Endosseous / Q000379:methods; D015921:Dental Implants / Q000145:classification*; D003764:Dental Materials / Q000737:chemistry; D017267:Dental Prosthesis Design; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008334:Mandible / Q000601:surgery; D008437:Maxilla / Q000601:surgery; D008875:Middle Aged; D016348:Osseointegration / Q000502:physiology; D011446:Prospective Studies; D011859:Radiography; D012737:Sex Factors; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry
chemical_list: D002130:Calcium Phosphates; D020099:Coated Materials, Biocompatible; D015921:Dental Implants; D003764:Dental Materials; C020243:calcium phosphate; D014025:Titanium