Marginal bone level change during sequential loading periods of partial edentulous rehabilitation using immediately loaded self-tapping implants: a 6.5-year retrospective study

Abstract

PURPOSE A large number of studies have suggested the practicability and predictability of immediate implant function, but few studies have reported marginal bone level changes during sequential loading periods. The purpose of this study was to evaluate the marginal bone remodeling of immediately loaded self-tapping implants both at each time point and during each loading period between two time points. MATERIALS AND METHODS The patients included in this retrospective study were treated with immediately loaded NobelSpeedy Replace implants between August 2008 and July 2009. Differences in the marginal bone level (MBL) at each time point and the marginal bone level change (ΔMBL) between two time points were analyzed with Bonferroni correction ( P < .05). RESULTS Overall, 24 patients (mean age, 47.3 ± 12.8 years) with 42 immediately loaded implants and a median follow-up of 6.5 years (IQR, 67.8 months) were included. The cumulative survival rate after 10 - 12 years was 95.2%. Continuous but slow marginal bone loss was observed during long-term follow-up. MBL at both 7.5 years and 11 years was significantly lower than that at loading, 6 months, 2 years and 4 years ( P < .05). No bone loss difference was found in any period before 4 years of follow up ( P > .05). The loading period of 4 years to 7.5 years showed the largest ΔMBL compared to those of other time periods ( P < .05). CONCLUSION Slight bone loss occurred continuously, and more radical changes of marginal bone can be observed during the period of 4-7.5 years. Thus, long-term effective follow-up of immediately loaded implants is needed.

Outcomes of Immediately & Conventionally Loaded Dental Implants

“…Reported implant losses in selected studies, occurred within 03 months of healing period; therefore they can be labelled as "early implant loss." [41][42][43][44] "IL protocol" when used rationally, may have an additive effect on marginal bone levels. The initial implant stability reduces 3-6 weeks following insertion due to osseous remodeling; strain during this period can be minimized by implant splinting & by reducing the occlusal loads.…”