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Volume 21 , Issue 5
September/October 2006

Pages 763768

Clinical Outcome of 802 Immediately Loaded 2-stage Submerged Implants with a New Grit-Blasted and Acid-Etched Surface: 12-month Follow-up

Marco Degidi, MD, DDS / Adriano Piattelli, MD, DDS / Peter Gehrke, DDS / Francesco Carinci, MD, DDS

PMID: 17066638

Purpose: The aim of this study was to evaluate the clinical outcome of delayed or immediately loaded implants of 3 different implant macrodesigns. The hypothesis was that no significant differences in implant success would be observed between immediately and delayed loaded implants. Materials and Methods: Between July 2003 and December 2003, 321 patients were consecutively enrolled for this study. Immediate loading was performed in cases where the implant stability quotient (ISQ) values were > 60 (as determined by resonance frequency analysis) and implant insertion torque was > 25 Ncm. In the case of delayed loading, a submerged technique (2-stage) or a single-stage procedure was used. The following variables were statistically analyzed with logistic regression: implant length, implant diameter, implant type, implant site, insertion torque, ISQ, and type of loading (immediate or delayed). Results: Eight hundred two implants were placed. Immediate loading was chosen for 423 implants and delayed loading for 379 implants. All implants were followed up for a minimum of 12 months after prosthetic loading. Only 3 implants were lost, with an overall success rate of 99.6%. No statistically significant differences were found for any variables between the failures in the 2 groups (immediate loading protocol versus delayed loading). Implants with a crestal bone loss greater than 0.2 mm during the first year of observation (69 cases) were evaluated as a group; within this subset, only ISQ value (P < .004), implant length (P < .002), and implant type (P < .049) had a statistically significant effect on crestal bone resorption. Conclusions: Based upon this study of 802 implants, no significant differences in implant success were observed between the 2 groups. (Comparative Cohort Study) Int J Oral Maxillofac Implants 2006;21:763768

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