ArticleAmerican journal of translational research2026
Association between mandibular third molar impaction pattern and mandibular crowding severity: a retrospective radiographic study.
Article in American journal of translational research, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
objectiveThis study analyzed mandibular third molar (M3M) impaction and its link to mandibular crowding.
methodsThis retrospective study included 351 M3M patients (Oct 2023-Oct 2024), with 320 analyzed after exclusion. Outcome measures included mandibular full dentition crowding (MFDC), retromolar space of the mandible (RSM), impaction angle of the mandibular third molar (IAM3M), crown width of the mandibular third molar (CW-M3), eruption height of the mandibular third molar (EH-M3), adjacent distance between the mandibular second and third molars (AD-M2M3), and root curvature of the mandibular third molar (RC-M3). Spearman correlation and linear regression identified risk factors for mandibular crowding. Receiver operating characteristic (ROC) analysis evaluated radiographic indicators' predictive value for severe crowding (>8 mm).
resultsAmong 320 subjects, 487 impacted M3M were identified, 53.39% mesial, 20.12% horizontal, 16.22% vertical, 5.75% distal, and 4.52% buccal/lingual. Crowding severity was mild (34.38%), moderate (44.06%), and severe (21.56%). Severe crowding was most frequent in mesial (60.9%) and horizontal (26.1%) impactions, with other types below 10%. One-way ANOVA showed MFDC, IAM3M, CW-M3, and EH-M3 decreased, mesial > horizontal > distal > vertical > buccal/lingual (all
conclusionM3M impaction worsens mandibular crowding, which offers clinical guidance.
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