Effect of Nail Biting Habit on Mandibular Bone Structure: A Retrospective Radiological Study
2026年7月31日 更新者：DİLARA NİL GÜNAÇAR、Recep Tayyip Erdogan University Training and Research Hospital
Evaluation of the Effects of Nail Biting Habit on Mandibular Bone Structure Using Fractal Analysis and Panoramic Morphometric Indices: A Retrospective Radiological Study
Nail biting (onychophagia) is a common parafunctional habit characterized by repetitive and non-functional biting behavior.
Although the effects of nail biting on dental structures and occlusion have been reported, its potential effects on mandibular bone structure remain unclear.
This retrospective radiological study aims to evaluate the association between nail biting habit and mandibular bone characteristics using fractal analysis and panoramic morphometric indices.
Existing panoramic radiographs of individuals with and without nail biting habits will be retrospectively analyzed.
Trabecular bone complexity, mandibular cortical width, panoramic mandibular index, and Klemetti index values will be compared between groups to investigate whether nail biting habit is associated with alterations in mandibular bone morphology.
調査の概要
状態
まだ募集していません
条件
詳細な説明
Nail biting (onychophagia) is classified as a body-focused repetitive behavior and represents a common parafunctional habit, particularly among children and adolescents. Continuous repetitive mechanical forces generated during nail biting may affect the stomatognathic system; however, the possible effects of this habit on mandibular bone structure have not been sufficiently investigated.
Fractal analysis is a radiological assessment method used to evaluate trabecular bone architecture by quantifying structural complexity. Higher fractal dimension values indicate increased complexity of bone patterns. In addition, panoramic morphometric indices such as mandibular cortical width, panoramic mandibular index, and Klemetti index provide information regarding cortical bone quality and quantity.
In this retrospective case-control study, existing panoramic radiographs of individuals with and without nail biting habits will be evaluated. Radiological parameters including fractal dimension, mandibular cortical width, panoramic mandibular index, and Klemetti index will be compared between groups. This study aims to determine whether nail biting habit is associated with measurable changes in mandibular trabecular and cortical bone characteristics.
研究の種類
観察的
入学 (推定)
100
連絡先と場所
このセクションには、調査を実施する担当者の連絡先の詳細と、この調査が実施されている場所に関する情報が記載されています。
研究連絡先
- 名前：dilara nil günaçar
- 電話番号：+905412940104
- メール：dilaranil.tomrukcu@erdogan.edu.tr
参加基準
研究者は、適格基準と呼ばれる特定の説明に適合する人を探します。これらの基準のいくつかの例は、人の一般的な健康状態または以前の治療です。
適格基準
就学可能な年齢
- 子
健康ボランティアの受け入れ
はい
サンプリング方法
非確率サンプル
調査対象母集団
The study population will consist of systemically healthy children aged 8-10 years who previously underwent routine dental examination at the Department of Pediatric Dentistry, Faculty of Dentistry, Recep Tayyip Erdoğan University.
Existing panoramic radiographs obtained during routine clinical care will be retrospectively analyzed.
Participants will be categorized into two groups according to the presence or absence of nail biting habit.
A minimum of 100 participants will be included, with equal distribution between the nail biting habit group and the control group and balanced sex distribution.
Mandibular bone characteristics will be evaluated using fractal dimension analysis and panoramic radiographic morphometric indices, including mandibular cortical width, panoramic mandibular index, mandibular cortical index (Klemetti index), and other mandibular bone measurements.
No intervention will be performed; only existing radiographic records will be assessed.
説明
Inclusion Criteria:
- Children aged 8-10 years who were examined at the Department of Pediatric Dentistry, Faculty of Dentistry, Recep Tayyip Erdoğan University.
- Systemically healthy participants.
- Participants with available diagnostic-quality panoramic radiographs obtained during routine dental examinations.
- Participants with and without a history of nail biting habit.
- Panoramic radiographs with sufficient image quality for fractal dimension analysis and mandibular morphometric measurements.
- Radiographs without periapical pathology in teeth adjacent to the regions of interest (ROI) used for fractal analysis.
- Participants with at least 20 existing teeth.
- Radiographic records with available parental radiographic information and consent documentation.
Exclusion Criteria:
- Participants with systemic diseases or conditions that may affect bone metabolism, including diabetes mellitus, osteoporosis, osteomalacia, renal diseases, hypothyroidism, or hyperparathyroidism.
- Participants using medications that may influence bone density or bone metabolism.
- Participants with temporomandibular joint disorders affecting the subcondylar region.
- Participants with mandibular pathological conditions, including cysts, tumors, or other lesions affecting mandibular bone structure.
- Participants with periapical pathology adjacent to the regions selected for fractal analysis.
- Participants with fewer than 20 teeth.
- Panoramic radiographs with insufficient diagnostic quality or image artifacts that prevent reliable measurements.
- Radiographs that do not allow accurate evaluation of mandibular cortical and trabecular bone parameters.
研究計画
このセクションでは、研究がどのように設計され、研究が何を測定しているかなど、研究計画の詳細を提供します。
研究はどのように設計されていますか？
デザインの詳細
コホートと介入
グループ/コホート |
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Nail Biting Habit Group
This cohort includes systemically healthy children aged 8-10 years with a documented nail biting habit.
Existing panoramic radiographs obtained during routine dental examinations will be retrospectively analyzed.
Mandibular trabecular bone structure will be evaluated using fractal dimension analysis, and cortical bone characteristics will be assessed using mandibular cortical width, panoramic mandibular index, and Klemetti index measurements.
No intervention will be performed.
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Control Group Without Nail Biting Habit
This cohort includes systemically healthy children aged 8-10 years without a history of nail biting habit.
Existing panoramic radiographs obtained during routine dental examinations will be retrospectively analyzed using the same radiological evaluation methods.
Mandibular trabecular and cortical bone characteristics will be compared with those of the nail biting habit group.
No intervention will be performed.
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この研究は何を測定していますか？
主要な結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
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Mandibular Trabecular Bone Structure Assessed by Fractal Dimension Analysis
時間枠：Baseline
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Mandibular trabecular bone architecture will be evaluated using fractal dimension analysis on panoramic radiographs.
Fractal dimension measurements will be performed using the box-counting method described by White and Rudolph.
Four regions of interest (ROIs) in the mandible will be analyzed, including the condylar subcortical region, supracortical region above the mandibular angle, area above the mandibular canal distal to the mental foramen, and anterior region of the mental foramen.
Measurements will be performed bilaterally, and the mean fractal dimension value will be calculated for each participant.
Higher fractal dimension values indicate greater trabecular bone complexity.
The fractal dimension values will be compared between individuals with and without nail biting habit.
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Baseline
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二次結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
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Panoramic Mandibular Index (PMI)
時間枠：Baseline
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The panoramic mandibular index (PMI) will be calculated on panoramic radiographs as the ratio of mandibular cortical width to the distance between the inferior border of the mandible and the inferior margin of the mental foramen.
Measurements will be performed bilaterally, and the mean value will be used for analysis.
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Baseline
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協力者と研究者
ここでは、この調査に関係する人々や組織を見つけることができます。
研究記録日
これらの日付は、ClinicalTrials.gov への研究記録と要約結果の提出の進捗状況を追跡します。研究記録と報告された結果は、国立医学図書館 (NLM) によって審査され、公開 Web サイトに掲載される前に、特定の品質管理基準を満たしていることが確認されます。
主要日程の研究
研究開始 (推定)
2026年7月27日
一次修了 (推定)
2026年8月5日
研究の完了 (推定)
2026年8月7日
試験登録日
最初に提出
2026年7月28日
QC基準を満たした最初の提出物
2026年7月31日
最初の投稿 (実際)
2026年8月3日
学習記録の更新
投稿された最後の更新 (実際)
2026年8月3日
QC基準を満たした最後の更新が送信されました
2026年7月31日
最終確認日
2026年7月1日
詳しくは
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