| Summary: | Objective: A retrospective review of charts was conducted to assess the survival rate and marginal bone loss around Nobel Active implants after one year of loading.
Methods: The study included 124 NobelActive dental implants that were placed by experienced practitioners in two private clinics and by senior Graduate Periodontics residents at the University of British Columbia. The effect of patient, medical condition, site, implant, surgeon’s experience and timing related risk factors on implant survival and marginal bone loss was evaluated. Implant failure was defined as the loss or removal of an implant. Radiographic measurements of marginal bone loss (mm) were made using Image J 1.42 software and Planmeca Romexis 2.2.7R software. Bivariate analyses were used to identify variables associated with implant failure and marginal bone loss. Risk factors that were shown to be significant (p<0.05) or thought to be relevant in previous studies were included in stepwise linear multiple regression and logistic regression analyses.
Results: NobelActive implants demonstrated a survival rate of 94.4% with 7 of the 64 patients experiencing one failure. Variables considered risk factors did not have a statistically significant effect on failure. The average mean marginal bone loss of the mesial and distal measurements was 0.89+(0.95) mm during the follow up period of 12.9 months (range of 4-27 months). The bivariate analysis revealed smoking, insertion torque, anatomic location, previous bone augmentation and immediate loading as significant predictors of marginal bone loss. Significant correlations were observed between insertion torque and bone quality and insertion torque and anatomic location in terms of marginal bone loss. The multiple regression analyses identified predictors that had the largest impact on marginal bone loss, these included diabetes, smoking, anatomic location, immediate placement and immediate loading.
Conclusions: The short-term clinical outcomes of survival rate and marginal bone loss for NobelActive implants are similar to those reported in literature for currently validated implant systems. Variables considered risk factors did not have a statistically significant
effect on implant failure, however diabetes, smoking, anatomic location, immediate placement and immediate loading did have a significant impact on marginal bone loss.
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