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

NCT07574710 | Completed

• 1 other identifier: BEC-LSMU(R)-41
• Study Type: interventional
• Target: 35
• Locations: 1 country
• Sites: 1

Brief Summary

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.

Conditions

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

Keywords

dental implant

Outcome Measures

Primary Outcomes (1)

• Marginal bone loss around dental implant

  From implant restoration delivery till 1 year follow-up

Secondary Outcomes (1)

• Implant stability quotient

  After implant placement and after 4 months

Study Arms (2)

4 mm

ACTIVE COMPARATOR

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

6 mm

EXPERIMENTAL

Procedure: Implant was placed 6 mm below free gingival margin

Interventions

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.

4 mm

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.

6 mm

Eligibility Criteria

• Age: 18 Years+
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• \) 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.

You may not qualify if:

• (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.

Sponsors & Collaborators

• Tomas Linkevicius: lead

Study Sites (1)

Lithuanian University of Health Sciences

Kaunas, Lithuania

Location

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: NON RANDOMIZED
• Masking: SINGLE
• Who Masked: OUTCOMES ASSESSOR
• Purpose: TREATMENT
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: SPONSOR INVESTIGATOR
• PI Title: Professor

Study Record Dates

• First Submitted: May 1, 2026
• First Posted: May 8, 2026
• Study Start: February 8, 2021
• Primary Completion: September 16, 2024
• Study Completion: September 16, 2024
• Last Updated: May 8, 2026

Record last verified: 2026-05

Data Sharing

• IPD Sharing: Will not share

Locations

LI (1)