A 5-year prospective radiographic evaluation of marginal bone levels adjacent to parallel-screw cylinder machined-neck implants and rough-surfaced microthreaded implants using digitized panoramic radiographs |
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| Authors: | Hans-Joachim Nickenig Manfred Wichmann Arndt Happe Joachim E Zöller Stephan Eitner |
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| Institution: | 1. Department of Oral, Maxillary and Plastic Facial Surgery (Head: Prof. Dr. Dr. J.E. Zöller), University of Cologne, Kerpener Str. 62, G-50937 Cologne, Germany;2. Interdisciplinary Department of Oral Surgery and Implantology (Head: Prof. Dr. Dr. J.E. Zöller), University of Cologne, Kerpener Str. 62, G-50937 Cologne, Germany;3. Department of Prosthodontics (Head: Prof. Dr. M. Wichmann), University Hospital Erlangen, Glückstr. 11, G-91054 Erlangen, Germany;1. Department of Oral and Maxillofacial Surgery, University Medical Center Mainz, Augustusplatz 2, 55131 Mainz, Germany;2. Institute of Medical Biostatistics, Epidemiology and Informatics (IMBEI), University Medical Center Mainz, Obere Zahlbacher Strasse 69, 55131 Mainz, Germany;3. Private Practice, Oral and Maxillofacial Surgery, Stresemannstrasse 7-9, 40210 Düsseldorf, Germany;1. Prosthodontics, Department of Surgery, Faculty of Medicine, University of Salamanca (USAL), C/Alfonso X el Sabio, s/n, Campus de Unamuno, E-37007 Salamanca, Spain;2. Department of Surgery, Faculty of Medicine, University of Salamanca (USAL), C/Alfonso X el Sabio, s/n, Campus de Unamuno, E-37007 Salamanca, Spain;3. Tissue Engineering & Reparative Dentistry, School of Dentistry, Heath Park, Cardiff, UK;4. Prosthodontics, Department of Buccofacial Prostheses, Faculty of Dentistry, Complutense University of Madrid (UCM), Pza. Ramón y Cajal, s/n, E-28040 Madrid, Spain;1. Postgraduate Program in Implantology of APCD, Jundiaí and Osasco, Brazil;2. São Leopoldo Mandic University, Campinas, Brazil;3. Catholic University of Uruguay, Montevideo, Uruguay;1. Department of Integrated Activities of Specialised Head-Neck Surgery, University of Modena and Reggio Emilia, Via del Pozzo 71 41100 Modena, Italy;2. Private Practice, Modena, Italy;3. Department of Periodontology, Saint-Joseph University, Beirut, Lebanon;4. University of Modena and Reggio Emilia, Italy;1. Department of Orthodontics, University Medical Center, Technische Universität Dresden, 01307 Dresden, Germany;2. Department of Prosthodontics, Gerodontology and Biomaterials, Medical University of Greifswald, 17489 Greifswald, Germany;3. Department of Orthodontics and Pediatric Dentistry, University of Szeged, 6720 Szeged, Hungary |
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| Abstract: | ObjectiveThe purpose of this split-mouth study was to compare macro- and microstructure implant surfaces at the marginal bone level over five years of functional loading.Materials and methodsFrom January to February 2006, 133 implants (70 rough-surfaced microthreaded implants and 63 machined-neck implants) were inserted in the mandible of 34 patients with Kennedy Class I residual dentitions and followed until December 2011. Marginal bone level was radiographically determined at six time points: implant placement (baseline), after the healing period, after six months, and at two years, three years, and five years follow-up.ResultsMedian follow-up time was 5.2 years (range: 5.1–5.4). The machined-neck group had a mean crestal bone loss of 0.5 mm (0.0–2.3) after the healing period, 1.1 mm (0.0–3.0) at two years follow-up, and 1.4 mm (0.0–2.9) at five years follow-up. The rough-surfaced microthreaded implant group had a mean bone loss of 0.1 mm (?0.4 to 2.0) after the healing period, 0.5 mm (0.0–2.1) at two years follow-up, and 0.7 mm (0.0–2.3) at five years follow-up. The two implant types showed significant differences in marginal bone levels.ConclusionsRough-surfaced microthreaded design caused significantly less loss of crestal bone levels under long-term functional loading in the mandible when compared to machined-neck implants. |
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