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Abstract :
[en] Long-term bone remodelling of implant placed in the posterior mandibule: a radiological study.
France Lambert, Kim Vincent, Caroline Geron, Geoffrey Lecloux, Eric Rompen.
Purpose: The aim of this study was to analyse direct and long-term (4 years) marginal bone remodelling of various implant systems placed in the posterior mandibule with a single stage approach.
Materials and methods: 50 partially edentulous patients received a total of 114 implants in the posterior mandibule (TE implant, Straumann®, Switzerland; Replace® Select Straight, Nobel Biocare, Sweden; Branemark System® MKIV, Nobel Biocare, Sweden). All implants were non-submerged, and loaded 8 to 12 weeks post surgery. X-rays were taken at baseline, 6 weeks, after loading and at long-term. Using a image processing program (Image J), bone losses were measured at each time point. Bone levels were also recorded using the first thread as reference point.
Results: The mean bone loss reached 0.506±0.498 mm at 6 weeks, 0.798±0.599 after loading and 1.037±0.799 after 4 years. Bone losses were significatively higher on smokers and on patients displaying signs of bruxism. No statistical difference was found between the different implant types.
Conclusion: 50% of the bone loss had already occurred within the 6 weeks post surgery with all implant types. Higher bone losses were often associated to risk factors such as tabacco addiction and bruxism.
