Volumetric Analysis of Recipient and Donor Sites Following Free Gingival Graft Surgery Harvested From Different Palatal Donor Sites: A Randomized Controlled Clinical Trial
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.
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.
Inclusion Criteria:
Exclusion Criteria: