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"Retrospective Study of the Risk of Pathology in the Mandibular Second Molar Associated With an Impacted Third Molar: Development and Validation of a Semi-Automated Artificial Intelligence-Based Digitisation Platform". (SMART-M3)

8 november 2026 uppdaterad av: Carlos Pérez-Albacete Martínez, Universidad Católica San Antonio de Murcia

Impacted mandibular third molars (wisdom teeth that cannot fully erupt) may damage the adjacent second molar, causing decay on its back surface, loss of the supporting bone or resorption of its root. These problems are often silent and are detected late. This retrospective observational study aims to identify which radiographic features of the impacted third molar are associated with a higher risk of pathology in the second molar.

The study uses panoramic radiographs (OPG) and cone-beam computed tomography (CBCT) scans that were previously obtained for clinical reasons at the UCAM Dental University Clinic (Murcia, Spain) between 2018 and 2026. No new images or procedures are performed on patients. The position, angulation, depth and contact of the third molar with the second molar are measured, and their relationship with second molar pathology is analysed. The study also compares the information provided by OPG and CBCT and develops and validates a semi-automated, artificial intelligence-based platform to help clinicians make these radiographic measurements faster and more consistently.

Studieöversikt

Status

Aktiv, inte rekryterande

Betingelser

Intervention / Behandling

Detaljerad beskrivning

Design. Single-centre, observational, cross-sectional, retrospective study approved by the Ethics Committee of the Universidad Católica San Antonio de Murcia (code CE102517). It follows the Declaration of Helsinki. Informed consent was waived because only pre-existing images obtained for clinical purposes are used. Data are pseudonymised in accordance with Regulation (EU) 2016/679 (GDPR) and Spanish Organic Law 3/2018.

Setting and sample. Consecutive sampling of all eligible images acquired at the UCAM Dental University Clinic between February 2018 and June 2026 with an ORTHOPHOS SL 3D unit (Dentsply Sirona). The unit of analysis is the mandibular third molar, so each patient may contribute one to four records (one or two third molars, on OPG, CBCT or both). The expected sample is approximately 2,110 third molars from 1,188 patients on OPG and approximately 690 third molars from 384 patients on CBCT, with a paired OPG-CBCT subsample of 667 teeth.

Variables. Third molar variables are:

  • Winter classification
  • Pell & Gregory depth and ramus relationship
  • Retromolar space
  • Angle between the long axes of the second and third molars
  • Distance from the distal surface of the second molar to the ramus
  • Mesiodistal diameter of the third molar
  • Presence, type and level of contact between the third and second molars Covariates are age, sex and smoking status. Outcome. The primary outcome is a composite of distal pathology of the mandibular second molar, defined as the presence of at least one of the following: distal caries, distal bone loss or external root resorption. Teeth without any of the three are classified as controls. Each component is also recorded separately, with its extent or severity.

Statistical analysis. The analysis comprises:

  • Descriptive statistics, overall and by imaging modality.
  • Bivariate analysis using chi-square or Fisher's exact tests and Mann-Whitney U or Student's t tests, with odds ratios, 95% confidence intervals and correction for multiple comparisons.
  • Multivariable mixed-effects logistic regression with the patient as a random effect, to account for the clustering of teeth within patients.
  • Assessment of the model's discrimination with ROC curves and AUC.
  • Agreement between OPG and CBCT in the paired subsample, using intraclass correlation coefficients, simple and weighted kappa and Bland-Altman analysis, with 95% confidence intervals obtained by patient-clustered bootstrap.
  • Intra-observer reliability on 123 teeth per modality. AI-based platform. A semi-automated digitisation platform based on artificial intelligence (automatic landmark detection) is developed to perform the radiographic measurements. It is validated against expert manual assessment in an independent subsample of 191 third molars (103 OPG and 88 CBCT).

Studietyp

Observationell

Inskrivning (Faktisk)

1188

Kontakter och platser

Det här avsnittet innehåller kontaktuppgifter för dem som genomför studien och information om var denna studie genomförs.

Studieorter

    • Murcia
      • Murcia, Murcia, Spanien, 30008
        • Clínica Universitaria UCAM Dental

Deltagandekriterier

Forskare letar efter personer som passar en viss beskrivning, så kallade behörighetskriterier. Några exempel på dessa kriterier är en persons allmänna hälsotillstånd eller tidigare behandlingar.

Urvalskriterier

Åldrar som är berättigade till studier

18 år och äldre (Vuxen, Äldre vuxen)

Tar emot friska volontärer

Nej

Kön som är behöriga för studier

Allt

Testmetod

Icke-sannolikhetsprov

Studera befolkning

Adult patients (18 years or older) who attended the UCAM Dental University Clinic (Murcia, Spain) between February 2018 and June 2026 and had at least one mandibular third molar visible on a panoramic radiograph (OPG) and/or cone-beam computed tomography (CBCT) scan obtained previously for clinical purposes. Patients were identified consecutively through the clinic's records management software (GESDEN).

Beskrivning

Inclusion Criteria:

  • Age 18 years or older.
  • Age and sex recorded.
  • At least one mandibular third molar present.
  • OPG and/or CBCT available.

Exclusion Criteria:

  • Absence of the adjacent second mandibular molar.
  • Insufficient diagnositc image quality.
  • Previous surgery altering the anatomy.
  • Cysts or tumours in the third molar region.

Studieplan

Det här avsnittet ger detaljer om studieplanen, inklusive hur studien är utformad och vad studien mäter.

Hur är studien utformad?

Designdetaljer

  • Observationsmodeller: COHORT
  • Tidsperspektiv: RETROSPECTIVE

Kohorter och interventioner

Grupp / Kohort
Intervention / Behandling
OPG cohort

Patients with an impacted mandibular third molar assessed on panoramic radiography.

The radiographic assessment was performed on images that were already available. No additional exposure was required.

CBCT cohort

Subset of patients also assessed on CBCT.

The radiographic assessment was performed on images that were already available. No additional exposure was required.

Vad mäter studien?

Primära resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
Primary
Tidsram: At the time of the radiographic examination (single cross-sectional assessment).

Composite distal pathology of the mandibular second molar (distal caries, distal bone loss and/or external root resorption).

At the time of the radiographic examination (single cross-sectional assessment).

Sekundära resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
Secondary
Tidsram: At the time of the radiographic examination (single cross-sectional assessment).

Agreement between OPG and CBCT measurements (ICC, weighted kappa, Bland-Altman).

At the time of the radiographic examination (single cross-sectional assessment).

Samarbetspartners och utredare

Det är här du hittar personer och organisationer som är involverade i denna studie.

Sponsor

Studieavstämningsdatum

Dessa datum spårar framstegen för inlämningar av studieposter och sammanfattande resultat till ClinicalTrials.gov. Studieposter och rapporterade resultat granskas av National Library of Medicine (NLM) för att säkerställa att de uppfyller specifika kvalitetskontrollstandarder innan de publiceras på den offentliga webbplatsen.

Studera stora datum

Studiestart (Faktisk)

31 oktober 2025

Primärt slutförande (Faktisk)

30 juli 2026

Avslutad studie (Beräknad)

15 december 2026

Studieregistreringsdatum

Först inskickad

8 november 2026

Först inskickad som uppfyllde QC-kriterierna

8 november 2026

Första postat (Faktisk)

13 november 2026

Uppdateringar av studier

Senaste uppdatering publicerad (Faktisk)

13 november 2026

Senaste inskickade uppdateringen som uppfyllde QC-kriterierna

8 november 2026

Senast verifierad

1 november 2026

Mer information

Termer relaterade till denna studie

Andra studie-ID-nummer

  • CE102517

Plan för individuella deltagardata (IPD)

Planerar du att dela individuella deltagardata (IPD)?

NEJ

IPD-planbeskrivning

Pseudonymised clinical images subject to GDPR; data available from the corresponding author upon reasonable request.

Läkemedels- och apparatinformation, studiedokument

Studerar en amerikansk FDA-reglerad läkemedelsprodukt

Nej

Studerar en amerikansk FDA-reglerad produktprodukt

Nej

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