PubMed-ID: 17066638Seiten: 763-768, Sprache: EnglischDegidi, Marco / Piattelli, Adriano / Gehrke, Peter / Carinci, FrancescoPurpose: 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)
Schlagwörter: bone loading, cement fixation, finite element analysis, in vivo strain measurements, passive fit, screw retention