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Radiographic evaluation of marginal bone levels adjacent to parallel‐screw cylinder machined‐neck implants and rough‐surfaced microthreaded implants using digitized panoramic radiographs
Author(s) -
Nickenig HansJoachim,
Wichmann Manfred,
Schlegel Karl Andreas,
Nkenke Emeka,
Eitner Stephan
Publication year - 2009
Publication title -
clinical oral implants research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.407
H-Index - 161
eISSN - 1600-0501
pISSN - 0905-7161
DOI - 10.1111/j.1600-0501.2008.01684.x
Subject(s) - radiography , medicine , implant , dentistry , mandible (arthropod mouthpart) , radiodensity , osseointegration , orthodontics , surgery , botany , biology , genus
Objective: The purpose of this split‐mouth study was to compare macro‐ and microstructure implant surfaces at the marginal bone level during a stress‐free healing period and under functional loading. Material and methods: From 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 February 2008. The marginal bone level was radiographically determined, using digitized panoramic radiographs, at four time points: at implant placement (baseline level), after the healing period, after 6 months of functional loading, and at the end of follow‐up. Results: The median follow‐up time was 1.9 (range: 1.9–2.1) years. The machined‐neck group had a mean crestal bone loss of 0.5 mm (range: 0–2.3) after the healing period, 0.8 mm after 6 months (range: 0–2.4), and 1.1 mm (range: 0–3) at the end of follow‐up. The rough‐surfaced microthreaded implant group had a mean bone loss of 0.1 mm (range: −0.4–2) after the healing period, 0.4 mm (range: 0–2.1) after 6 months, and 0.5 mm (range: 0–2.1) at the end of follow‐up. The two implant types showed significant differences in marginal bone levels (healing period: P =0.01; end of follow‐up: P <0.01). Conclusions: Radiographic evaluation of marginal bone levels adjacent to machined‐neck or rough‐surfaced microthreaded implants showed that implants with the microthreaded design caused minimal changes in crestal bone levels during healing (stress‐free) and under functional loading.