1-year results from a split-mouth randomised controlled pilot trial comparing implants with 0.75 mm of machined collar placed at bone level or supracrestally.

摘要: Purpose The present study evaluated the hypothesis that implants inserted at bone level or supracrestally have different outcomes in single tooth replacements against alternative of no difference. Materials and methods This was designed as a randomised, split-mouth, controlled pilot trial. Ten patients, each missing two bicuspids molars, were treated with 20 featuring 0.75 mm machined collar. Each patient randomly received one implant (BL) to 1 above alveolar crest (SC), measured periodontal probe during surgery. All into healed healthy an insertion torque ranging between 35 Ncm 45 Ncm. Both loaded screw-retained acrylic-resin temporary crowns 3 months after later zirconia-ceramic definitive crowns. Outcome measures implant/crown failures, biological prosthetic complications, radiographic marginal changes (MBL), probing pocket depth (PPD) bleeding on (BOP). Clinical data collected baseline (implant insertion) year placement (9 initial loading). Results After follow-up, patients dropped out, failed, complications occurred. mean MBL 1-year follow-up 0.28 ± 0.21 SC group 0.93 0.37 BL group. While difference statistically significant treatment groups (difference 0.65 0.34; 95% CI = 0.59 1.01; P 0.0001), soft-tissue parameters not different. PPD 2.63 2.4 2.40 0.70 (P 0.419) BOP 0.50 0.71 0.40 0.754). Conclusions smooth-collar showed 0.7 less loss compared 9 loading.