Trial reportJournal of prosthodontics : official journal of the American College of Prosthodontists2026
The influence of implant placement depth on peri-implant tissues in immediate implant placement: A randomized controlled clinical trial with 1-year follow-up.
Trial report in Journal of prosthodontics : official journal of the American College of Prosthodontists, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Authors and funding
6 authors.
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Abstract
purposeThis clinical trial was carried out to compare the outcomes of immediate implants positioned 4 mm below free gingival margin versus deeper placement of 6 mm after a period of 1 year. MATERIALS AND
methodsSeventy platform-switching implants with a Morse taper conical connection and 1 mm of machined neck were placed in a flapless approach in the molar or premolar region immediately after tooth extraction. A total of 35 implants were positioned 4 mm below the buccal gingival margin (control group), and another 35 were placed 6 mm below the gingival margin (test group). All implant sites were grafted with an allogenic bone substitute and received individual healing abutments (IHAs) made chairside. After 4 months, the implants were restored with final screw-retained zirconia restorations. Radiographic marginal bone loss (MBL) was measured at the delivery of the final restoration (T1) and after 1 year (T2). Peri-implant clinical parameters (probing depth [PD], bleeding on probing [BOP], and plaque index [PI]) were recorded at 1-year follow-up appointment (T2).
resultsIn total, 70 implants were evaluated after 1 year of follow-up (35 control and 35 test groups). The test group showed significantly lower (p < 0.001) MBL than the control group at both T1 (mean ± standard deviation: 0.11 ± 0.32 vs. 0.76 ± 0.68 mm) and T2 (0.12 ± 0.23 vs. 0.54 ± 0.49 mm). The PD mean was 3.46 ± 0.74 in the control group and 3.49 ± 1.20 in the test group, with a p-value of 0.890. PI and BOP were also similar in both groups: PI-11% for the control and 8% for the test groups (p = 0.551), BOP-13% for the control and 7% for the test groups (p = 0.214).
conclusionsImmediate implants placed 6 mm below the mid-buccal gingival level showed significantly less short-term (up to 1 year) MBL than immediate implants placed 4 mm below the gingiva.
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