Abstract
This randomised controlled trial compares the 3-year outcomes, that is, marginal bone-level (MBL) changes and clinical parameters, between an abutment-level (AL) and implant-level (IL) connection for implants with an internal conical connection (ICC) supporting a screw-retained fixed partial denture. Fifty patients with 119 implants were randomly allocated to either the AL or IL group. Radiographic and clinical examinations were performed after one, two, and 3years. A linear mixed model was used to evaluate the differences between groups. The MBL change was not significantly different between the groups at any point. The MBL was 0.12±0.31mm (AL) and 0.23±0.26mm (IL) after 1year; 0.15±0.34mm (AL) and 0.17±0.22mm (IL) after 2years; 0.18±0.39mm (AL) and 0.15±0.21mm (IL) after 3years. The bleeding on probing was 43.44±39.24% (AL) and 58.19±41.20% (IL) after 1year; 35.78±39.22% (AL) and 50.43±41.49% (IL) after 2years; 51.27±44.63% (AL) and 49.57±37.31% (IL) after 3years and was significantly different (p=.025) between 1 and 2years. The probing depth showed a significant difference at each time point while the plaque was not significant between the groups. The overall technical, biological and prosthetic complication rates were 5.04%, 3.36%, and 16.00%, respectively. The MBL change was similar in the groups. The slight differences in the soft tissue complications between the groups are likely not of clinical relevance. An IL connection is considered to be a valid alternative to an AL set-up in ICC implants.
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