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Gingival RecessionNCT07554625

Volumetric Changes After Free Gingival Graft: Tuberosity vs Palatal Donor Site (VolFGG-TP)

A study testing Free Gingival Graft from Anterior Palatal Donor Site and Free Gingival Graft from Posterior Palatal / Tuberosity Donor Site in people with Gingival Recession and Periodontal Plastic Surgery, run by Hooman Hashemzadeh at 1 site in Turkey (Türkiye).

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

This randomized controlled clinical trial evaluated volumetric changes at recipient and donor sites following free gingival graft (FGG) surgery, comparing two different palatal donor regions. Read more about this study

Who is it for?
Ages 20 to 40 yearsHealthy volunteers can take part
What is being tested?
Free Gingival Graft from Anterior Palatal Donor Site and Free Gingival Graft from Posterior Palatal / Tuberosity Donor Site
Type of treatment
Surgery or procedure
Could I receive a placebo?
No, everyone receives an active treatment
How many people
40 participants
Where
1 siteTurkey (Türkiye)
Study dates
1 Dec 2023to 1 May 2025
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 20 to 40 years
  • All sexes
  • Healthy volunteers accepted
  • Adult

Who may be able to join

  • Adults aged 20 to 40 years (both male and female)
  • Presence of Miller Class I gingival recession at mandibular anterior teeth (teeth 31, 32, 41, and 42)
  • Systemically healthy (no known systemic diseases)
  • Non-smokers
  • Adequate oral hygiene
  • Able and willing to provide written informed consent and attend follow-up visits

Who cannot join

  • Pregnancy or lactation
  • Current or past smoking
  • Diagnosis of diabetes mellitus
  • Use of isotretinoin or similar systemic anti-acne medications
  • Inadequate oral hygiene
  • Current anticoagulant therapy
  • Systemic contraindications to periodontal surgery
  • History of previous periodontal surgery at the recipient site

Trial locations and contacts

1 site in 1 country.

Turkey (Türkiye)1 site
  • Ondokuz Mayis University, Faculty of Dentistry, Department of Periodontology

    Samsun, Samsun, 55270

Other trials in Turkey (Türkiye)

About this study

Official title: Volumetric Analysis of Recipient and Donor Sites Following Free Gingival Graft Surgery Harvested From Different Palatal Donor Sites: A Randomized Controlled Clinical Trial

This randomized controlled clinical trial evaluated volumetric changes at recipient and donor sites following free gingival graft (FGG) surgery, comparing two different palatal donor regions. Forty systemically healthy non-smoking adults aged 20-40 years with Miller Class I gingival recession defects at the mandibular anterior teeth (teeth 31, 32, 41, and 42) were randomly allocated using a sealed envelope method into two groups based on the donor site: (1) the anterior palatal region (from the distal of the canine to the first molar), and (2) the posterior palatal/tuberosity region (between the first molar and the tuberosity). All grafts were harvested targeting a standardized size of 8x10 mm (80 mm²). Digital intraoral scans (3Shape TRIOS 5) were obtained preoperatively and at 1, 3, and 6 months postoperatively. Volumetric changes at both recipient and donor sites were measured using STL-based superimposition in Exocad software. The aim was to compare time-dependent volumetric change patterns at both the recipient and donor sites between the two donor groups.

Read the detailed description

BACKGROUND:

Free gingival graft (FGG) is a well-established procedure to augment keratinized tissue width and manage gingival recession defects. Despite widespread clinical use, comparative data on volumetric outcomes from different palatal donor sites remain limited, and most existing studies rely on one-dimensional clinical measurements rather than volumetric analysis. Emerging evidence suggests that donor tissue composition may differ between anterior palatal and posterior palatal/tuberosity regions, potentially influencing graft behavior at the recipient site.

STUDY DESIGN:

Single-center, parallel-group, randomized controlled clinical trial with 1:1 allocation via sealed envelope randomization.

INTERVENTION:

All surgical procedures were performed by a single operator under local infiltration anesthesia (Ultracain DS, epinephrine 1:200,000). At the recipient site, a split-thickness recipient bed was prepared and the autogenous free gingival graft was stabilized using five 7-0 polypropylene monofilament sutures. Sutures were removed between days 10-14. At the donor site, no sutures were placed and the wound was left to heal by secondary intention. Grafts were harvested aiming for 8x10 mm dimensions.

OUTCOME ASSESSMENT:

Intraoral scans were acquired at T0 (preoperative baseline), T1 (1 month), T2 (3 months), and T3 (6 months) using a 3Shape TRIOS 5 intraoral scanner and saved as STL files. STL files were superimposed in Exocad using a point-based landmark registration protocol, with three corresponding dental landmarks identified on stable hard-tissue surfaces; each postoperative scan was aligned to the T0 baseline. Recipient and donor regions of interest were isolated. MeshMixer was used for STL preparation, while final volumetric calculations were performed in Exocad and recorded in mm³. To account for unavoidable minor variations in graft dimensions, volumetric data were mathematically normalized to a theoretical standard graft surface area of 80 mm² (8x10 mm).

STATISTICAL ANALYSIS:

Sample size was calculated a priori using G*Power 3.1 (α=0.05, power=0.80, matched-pairs model, effect size dz≈0.69), yielding 20 patients per group (40 total). Analyses were conducted in SPSS v25.0 with significance set at p<0.05. Data distribution was assessed using the Shapiro-Wilk test. Within-group time effects were evaluated using Repeated Measures ANOVA; between-group comparisons at each time point were performed using independent samples t-test. Time × donor-site interaction was analyzed to determine whether volumetric change patterns differed between groups over time.

Being tested
Free Gingival Graft from Anterior Palatal Donor Site, Free Gingival Graft from Posterior Palatal / Tuberosity Donor Site
Keywords
free gingival graft, palatal donor site, volumetric analysis, digital dentistry, intraoral scanner
Medical subject headings
Gingival Recession

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Free Gingival Graft from Anterior Palatal Donor SiteProcedure or surgery

    Free gingival graft (FGG) surgery was performed under local infiltration anesthesia (Ultracain DS, epinephrine 1:200,000) by a single experienced operator. At the recipient site, a split-thickness recipient bed was prepared at the buccal aspect of mandibular anterior teeth presenting Miller Class I gingival recession. The autogenous free gingival graft was harvested from the anterior palatal region, defined as the area between the distal aspect of the maxillary canine and the first molar, targeting dimensions of 8 × 10 mm. The graft was secured at the recipient site using five 7-0 polypropylene monofilament sutures. No sutures were placed at the donor site; the wound was left to heal by secondary intention. Sutures at the recipient site were removed between postoperative days 10 and 14. All patients received standardized postoperative instructions and analgesic recommendations.

  • Free Gingival Graft from Posterior Palatal / Tuberosity Donor SiteProcedure or surgery

    Free gingival graft (FGG) surgery was performed under local infiltration anesthesia (Ultracain DS, epinephrine 1:200,000) by a single experienced operator. At the recipient site, a split-thickness recipient bed was prepared at the buccal aspect of mandibular anterior teeth presenting Miller Class I gingival recession. The autogenous free gingival graft was harvested from the maxillary tuberosity / posterior palatal region, targeting dimensions of 8 × 10 mm. The graft was secured at the recipient site using five 7-0 polypropylene monofilament sutures. No sutures were placed at the donor site; the wound was left to heal by secondary intention. Sutures at the recipient site were removed between postoperative days 10 and 14. All patients received standardized postoperative instructions and analgesic recommendations.

Study groups in NCT07554625
Study groupRoleWhat they receive
Anterior Palatal Donor GroupExperimentalFree gingival graft was harvested from the anterior palatal region, defined as the area between the distal of the maxillary canine and the first molar. The graft was targeted to be 8x10 mm (approximately 80 mm²) in dimension. After harvesting, the graft was placed at the recipient site (Miller Class I gingival recession at mandibular anterior teeth 31, 32, 41, 42) and stabilized with five 7-0 polypropylene sutures. The donor site was left to heal by secondary intention without sutures.
Receives: Procedure: Free Gingival Graft from Anterior Palatal Donor Site
Posterior Palatal / Tuberosity Donor GroupExperimentalFree gingival graft was harvested exclusively from the maxillary tuberosity region. The graft was targeted to be 8x10 mm (approximately 80 mm²) in dimension. After harvesting, the graft was placed at the recipient site (Miller Class I gingival recession at mandibular anterior teeth 31, 32, 41, 42) and stabilized with five 7-0 polypropylene sutures. The donor site was left to heal by secondary intention without sutures.
Receives: Procedure: Free Gingival Graft from Posterior Palatal / Tuberosity Donor Site

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Volumetric change at the recipient site

    Standardized volumetric change (mm³) at the recipient site compared with preoperative baseline (T0), measured via three-dimensional STL-based superimposition of intraoral scans (3Shape TRIOS 5) using Exocad software. Volumetric data were mathematically normalized to a theoretical standard graft surface area of 80 mm² (8x10 mm) to account for minor graft size variations. Negative values indicate volume loss; positive values indicate volume gain relative to baseline.

    Measured: 1, 3, and 6 months postoperatively

Secondary outcomes (2)
  1. Volumetric change at the donor site

    Standardized volumetric change (mm³) at the palatal donor site (either anterior palatal or posterior palatal/tuberosity, as per group allocation) compared with preoperative baseline (T0), measured via three-dimensional STL-based superimposition of intraoral scans (3Shape TRIOS 5) using Exocad software. Negative values indicate volume loss relative to baseline; positive values indicate volume gain relative to baseline.

    Measured: 1, 3, and 6 months postoperatively

  2. Time × donor-site interaction effect on volumetric change at the recipient site

    Repeated Measures ANOVA interaction term evaluating whether time-dependent volumetric change patterns at the recipient site differ between the two donor groups (anterior palatal versus posterior palatal/tuberosity). A significant interaction (p<0.05) indicates that volumetric change trajectories across time differ between donor groups.

    Measured: Across 1, 3, and 6 months postoperatively

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted28 Apr 2026
  2. Study start1 Dec 2023
  3. Primary completion1 May 2025
  4. Study completion1 May 2025

Resources

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
Randomised
Intervention model
Parallel groups
Masking
None (open label)
Enrolment
40 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT07554625
Sponsor's protocol ID
B.30.2.ODM.0.20.08/569
Status last verified
Apr 2026
First submitted
21 Apr 2026
Last updated
13 Aug 2026
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No

Publications

  • Parvini P, Galarraga-Vinueza ME, Obreja K, Magini RS, Sader R, Schwarz F. Prospective study assessing three-dimensional changes of mucosal healing following soft tissue augmentation using free gingival grafts. J Periodontol. 2021 Mar;92(3):400-408. doi: 10.1002/JPER.19-0640. Epub 2020 Aug 21.

    PubMed 33448379
  • Tavelli L, Barootchi S, Siqueira R, Kauffmann F, Majzoub J, Stefanini M, Zucchelli G, Wang HL. Three-Dimensional Volumetric Analysis of the Palatal Donor Site Following Soft Tissue Harvesting. Int J Periodontics Restorative Dent. 2022 May-Jun;42(3):393-399. doi: 10.11607/prd.5268.

    PubMed 35472117
  • Akan E, Hashemzadeh H, Kirtiloglu T. Volumetric comparison of free gingival grafts harvested from palatal versus tuberosity donor sites: a six-month randomised controlled trial using three-dimensional intraoral scanning. Odontology. 2026 Oct 31. doi: 10.1007/s10266-026-01590-2. Online ahead of print.

    PubMed 42966784

Questions about this trial

What is this clinical trial studying?

A study testing Free Gingival Graft from Anterior Palatal Donor Site and Free Gingival Graft from Posterior Palatal / Tuberosity Donor Site in people with Gingival Recession and Periodontal Plastic Surgery, run by Hooman Hashemzadeh at 1 site in Turkey (Türkiye).

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 6 inclusion and 8 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 13 Aug 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 Turkey (Türkiye). 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?

Volumetric change at the recipient site (time frame: 1, 3, and 6 months postoperatively). It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT07554625, which also lists 3 linked publications.

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 13 Aug 2026.

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