Effect of Nail Biting Habit on Mandibular Bone Structure: A Retrospective Radiological Study
31. juli 2026 opdateret af: 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.
Studieoversigt
Status
Ikke rekrutterer endnu
Betingelser
Detaljeret beskrivelse
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.
Undersøgelsestype
Observationel
Tilmelding (Anslået)
100
Kontakter og lokationer
Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.
Studiekontakt
- Navn: dilara nil günaçar
- Telefonnummer: +905412940104
- E-mail: dilaranil.tomrukcu@erdogan.edu.tr
Deltagelseskriterier
Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.
Berettigelseskriterier
Aldre berettiget til at studere
- Barn
Tager imod sunde frivillige
Ja
Prøveudtagningsmetode
Ikke-sandsynlighedsprøve
Studiebefolkning
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.
Beskrivelse
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.
Studieplan
Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.
Hvordan er undersøgelsen tilrettelagt?
Design detaljer
Kohorter og interventioner
Gruppe / kohorte |
|---|
|
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.
|
|
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.
|
Hvad måler undersøgelsen?
Primære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
|---|---|---|
|
Mandibular Trabecular Bone Structure Assessed by Fractal Dimension Analysis
Tidsramme: Baseline
|
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.
|
Baseline
|
Sekundære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
|---|---|---|
|
Panoramic Mandibular Index (PMI)
Tidsramme: Baseline
|
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.
|
Baseline
|
Samarbejdspartnere og efterforskere
Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.
Datoer for undersøgelser
Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.
Studer store datoer
Studiestart (Anslået)
27. juli 2026
Primær færdiggørelse (Anslået)
5. august 2026
Studieafslutning (Anslået)
7. august 2026
Datoer for studieregistrering
Først indsendt
28. juli 2026
Først indsendt, der opfyldte QC-kriterier
31. juli 2026
Først opslået (Faktiske)
3. august 2026
Opdateringer af undersøgelsesjournaler
Sidste opdatering sendt (Faktiske)
3. august 2026
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
31. juli 2026
Sidst verificeret
1. juli 2026
Mere information
Begreber relateret til denne undersøgelse
Yderligere relevante MeSH-vilkår
Andre undersøgelses-id-numre
- 2026/315
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