Dental ImplantNCT07574710
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
A study testing Implants were positioned 4 mm below the mid-facial gingival margin and Implant was placed 6 mm below free gingival margin in people with Dental Implant and Tooth Extractions, run by Tomas Linkevicius at 1 site in Lithuania.
Trial 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. Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Dental Implant, Tooth Extractions, Marginal Bone Loss Around Implants
- What is being tested?
- Implants were positioned 4 mm below the mid-facial gingival margin and Implant was placed 6 mm below free gingival margin
- Type of treatment
- Surgery or procedure
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 35 participants
- Where
- 1 siteLithuania
- Study dates
- 8 Feb 2021to 16 Sep 2024
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- 1) 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
Who cannot join
- 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
Trial locations and contacts
1 site in 1 country.
About this study
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
- Being tested
- Implants were positioned 4 mm below the mid-facial gingival margin, Implant was placed 6 mm below free gingival margin
- Keywords
- dental implant
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Implants were positioned 4 mm below the mid-facial gingival marginProcedure or surgery
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 marginProcedure or surgery
Tooth was extracted and dental implant placed 6 mm below free gingival margin of the extracted tooth.
| Study group | Role | What they receive |
|---|---|---|
| 4 mm | Active comparator | Not described Receives: Procedure: Implants were positioned 4 mm below the mid-facial gingival margin |
| 6 mm | Experimental | Not described Receives: Procedure: Implant was placed 6 mm below free gingival margin |
What is being measured
The primary outcome is the main question the study is designed to answer.
Marginal bone loss around dental implant
Measured: From implant restoration delivery till 1 year follow-up
Secondary outcomes (1)
Implant stability quotient
Measured: After implant placement and after 4 months
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted8 May 2026
- Study start8 Feb 2021
- Primary completion16 Sep 2024
- Study completion16 Sep 2024
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Dental ImplantStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Treatment
- Allocation
- Non-randomised
- Intervention model
- Parallel groups
- Masking
- Single blind
- Who is masked
- Outcomes assessor
- Enrolment
- 35 participants (actual)
Sponsor and investigators
- Lead sponsor
- Tomas Linkevicius
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor-investigator, Tomas Linkevicius, Lithuanian University of Health Sciences
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07574710
- Sponsor's protocol ID
- BEC-LSMU(R)-41
- Status last verified
- May 2026
- First submitted
- 1 May 2026
- Last updated
- 8 Jun 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No
Study at a glance
From the registry record, last updated by the sponsor on 8 Jun 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- 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
- ClinicalTrials.gov ID
- NCT07574710
- Acronym / sponsor ID
- BEC-LSMU(R)-41
- Conditions
- Dental Implant, Tooth Extractions, Marginal Bone Loss Around Implants, Primary Stability of the Implants
- Keywords
- dental implant
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 35 participants (actual)
- Lead sponsor
- Tomas LinkeviciusUniversity, hospital or other
- Study start
- 8 Feb 2021 (actual)
- Primary completion
- 16 Sep 2024 (actual)
- Study completion
- 16 Sep 2024 (actual)
- First posted
- 8 May 2026 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
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.
Study design
- Primary purpose
- Treatment
- Allocation
- Non-randomised
- Intervention model
- Parallel groups
- Masking
- Single blind (outcomes assessor)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| 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 |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (1 listed)
- 1) 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
Key exclusion criteria (1 listed)
- 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
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Implants were positioned 4 mm below the mid-facial gingival marginTooth was carefully extracted and implant was placed 4 mm below free gingival margin of the extracted tooth. | Procedure or surgery | 4 mm |
| Implant was placed 6 mm below free gingival marginTooth was extracted and dental implant placed 6 mm below free gingival margin of the extracted tooth. | Procedure or surgery | 6 mm |
Primary outcome
Marginal bone loss around dental implant
Time frame: From implant restoration delivery till 1 year follow-up
1 secondary outcome
Implant stability quotient
Time frame: After implant placement and after 4 months
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 8 Jun 2026.
- Individual participant dataSharing planned: No
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Implants were positioned 4 mm below the mid-facial gingival margin and Implant was placed 6 mm below free gingival margin in people with Dental Implant and Tooth Extractions, run by Tomas Linkevicius at 1 site in Lithuania.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 1 inclusion and 1 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 8 Jun 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Lithuania. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Marginal bone loss around dental implant (time frame: From implant restoration delivery till 1 year follow-up). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 8 Jun 2026.