An observational study in Gingival Biotype, Gingival Phenotype and Buccal Bone Thickness, sponsored by Trakya University. Recruiting at 2 sites in Turkey (Türkiye). Open to participants aged 18 Years to 65 Years. Per ClinicalTrials.gov, last updated 2026-06-08.
Sponsored by Trakya University · Observational
The goal of this observational study is to learn how the health and thickness of the gums and supporting bone around the teeth change over 6 months in adults having jaw surgery to correct the bite. The main questions it aims to answer are:
Participants will:
This two-center prospective observational cohort study will enroll adult patients who are scheduled to undergo orthognathic surgery according to standard clinical indications. Orthognathic surgeries will be performed at Kocaeli Health and Technology University, while periodontal clinical examinations and CBCT-based assessments will be conducted at Trakya University. Participants will be evaluated at baseline (preoperatively) and at 1, 3, and 6 months after surgery. Clinical periodontal assessments will include predefined periodontal phenotype-related parameters recorded using a standardized protocol. CBCT datasets will be obtained and analyzed using a standardized measurement protocol to assess buccal alveolar bone-related parameters and the presence of dehiscence/fenestration where applicable. To minimize assessment bias, CBCT images will be coded and evaluated by an independent assessor blinded to surgical details and group classification, and clinical periodontal examinations will be performed by an examiner blinded to the surgical procedure details.
426 studies on the registry are indexed under Gingival Recession; 106 are open to participants now.
This study's planned enrollment of 100 is above the median of 48 across 31 observational studies indexed under Gingival Recession.
Browse Gingival Recession studies →Trakya University is the lead sponsor of 155 studies on the registry; 15 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Adult patients referred for orthognathic surgery to the Department of Oral and Maxillofacial Surgery at Kocaeli Health and Technology University and subsequently evaluated at the Department of Periodontology at Trakya University
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Change in width of keratinized gingiva (mm)
Width of keratinized gingiva is measured as the distance from the gingival margin to the mucogingival junction, recorded in mm.
Time frame: Baseline (preoperative) and postoperative 1, 3, and 6 months.
Change in gingival thickness phenotype (thin vs thick)
Gingival thickness is assessed with a periodontal probe by the probe-transparency method and categorized as thin (≤1 mm; probe visible) or thick (\>1 mm; probe not visible)
Time frame: Baseline (preoperative) and postoperative 1, 3, and 6 months.
Change in buccal cortical bone thickness on CBCT (mm)
Buccal cortical bone thickness is measured on CBCT as the horizontal distance from the deepest point of the buccal marginal bone curvature (A) to the CEJ, and additionally at 4 mm apical to A and at the apex level, as defined in the protocol
Time frame: Baseline (preoperative) and postoperative follow-up CBCT records were obtained during routine controls (planned at 6 months).
Probing pocket depth (mm)
Time frame: Baseline (preoperative) and postoperative 1, 3, and 6 months.
Bleeding on probing (0/1)
Time frame: Baseline (preoperative) and postoperative 1, 3, and 6 months.
Gingival Index (0-3)
Time frame: Baseline (preoperative) and postoperative 1, 3, and 6 months.
Plaque Index (0-3)
Time frame: Baseline (preoperative) and postoperative 1, 3, and 6 months.
Papilla loss classification (Nordland & Tarnow)
Time frame: Baseline (preoperative) and postoperative 1, 3, and 6 months.
Gingival recession (mm)
Time frame: Baseline and postoperative 1, 3, 6 months.
Fenestration/dehiscence presence on CBCT (yes/no) (and/or counts)
Time frame: Baseline and postoperative 6 months.
Clinical attachment loss (mm)
Time frame: Baseline and postoperative 1, 3, 6 months
Plan to share: No — Individual participant data containing personal health information will not be shared due to privacy and confidentiality requirements, as well as ethical restrictions and applicable standards
No publications or documents are linked to this record.
Started Feb 2026 (actual). Primary completion is estimated for Feb 2027, 12 months after the start.
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