Skip to main content
OpenTrials
Completed

NCT Number: NCT07574710

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.

Completed

Looking for future studies?

Notify Me

Key information

Conditions

Dental Implant Marginal Bone Loss Around Implants Primary Stability of the Implants Tooth Extractions

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Lithuanian University of Health Sciences

Kaunas, Lithuania

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • age ≥ 18 years; (2) generally healthy individuals with no medical contraindications for implant surgery; (3) healthy soft tissue, indicated by bleeding on probing (BOP) < 20% and Plaque Index (PI) < 25%; (4) keratinized gingiva ≥ 2 mm, both buccally and lingually; (5) presence of molar or premolar in the upper or lower jaw; (6) implant primary stability ≥ 35 Ncm; (7) intact alveolar bone walls post-extraction; (8) one study implant per patient; and (9) signed informed consent with permission to utilize data for research purposes

Exclusion criteria

(1) smoking (≥ 10 cigarettes/day); (2) history of uncontrolled periodontitis; (3) uncontrolled diabetes or alcoholism; (4) medications known to impair healing; and (5) implant primary stability < 35 Ncm

Treatment and study plan

Implants were positioned 4 mm below the mid-facial gingival margin

Procedure

Tooth was carefully extracted and implant was placed 4 mm below free gingival margin of the extracted tooth.

Implant was placed 6 mm below free gingival margin

Procedure

Tooth was extracted and dental implant placed 6 mm below free gingival margin of the extracted tooth.

Primary outcomes

  1. Marginal bone loss around dental implant

    Time frame: From implant restoration delivery till 1 year follow-up

Secondary outcomes

  1. Implant stability quotient

    Time frame: After implant placement and after 4 months

Sponsors and collaborators

Lead sponsor

Tomas Linkevicius

Other

Registry information

Important dates

Study start
2021
Primary completion
2024
Study completion
2024
First posted
May 8, 2026
Registry last updated
Jun 8, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

Related clinical trials

Published trials that share one or more normalized conditions with this study.