Evaluation of implants placed immediately or delayed into extraction sites.

Their results indicate that the delay technique can be an efficient method for establishing good bone binding,[ 23 ] while Schropp reported that new bone formation occurs in infrabony defects associated with immediately placed implants in extraction sockets.[ 6 ] Chen observed that comparison between immediate and delayed implantation sites showed a trend toward higher percentage of defect height and defect area at delayed sites (ranges between studies for defect height, 86% and 97%; for defect area, 86% and 97%) compared with immediate sites (defect height 77–95%; defect area 77–95%).[ 15 ] Weber estimated bone loss of about 0.6 mm around mandibular implants and 1.1 mm around maxillary implants in the 1 st year after implant placement.

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