Effects of Implant Placement Depth (4 mm Versus 6 mm) on Crestal Bone Stability in Immediate Implant Placement: A Clinical Study With 1-Year Post-Restorative Results

The aim of a study was to analyze the effect of implant placement depth (4 mm versus 6 mm below the mid-facial gingival margin) on marginal bone loss (MBL) around implant and implant stability during immediate implant placement after tooth extraction. Clinical trial was conducted involving 35 patients requiring immediate implant placement after tooth extraction. Implants were placed either 4 mm (control group) or 6 mm (test group) below the mid-facial gingival margin. Primary outcome was deemed to be radiographic assessment of marginal bone level from periapical radiographs. Secondary outcome was implant stability quotient registration using resonance freaquency analyzer. The null hypothesis is that there is no significant difference in peri-implant marginal bone loss between implants placed at 4 mm depth versus 6 mm depth relative to the buccal gingival margin during immediate implant placement.

NCT Number	NCT07574710
Lead Sponsor	Tomas Linkevicius
Conditions	Dental Implant, Tooth Extractions, Marginal Bone Loss Around Implants, Primary Stability of the Implants
Enrollment	35 participants
Start Date	2021-02-08
Primary Completion	2024-09-16 (estimated)
Study Completion	2024-09-16 (estimated)
Updated on ClinicalTrials.gov	2026-06-08