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Arch Oral Biol ; 164: 105983, 2024 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-38718467

RESUMO

OBJECTIVES: This study aimed to investigate the relationship between the aspect ratios of mandibular molar roots at the apical 3-mm level and their root canal complexity. DESIGN: This study used micro-CT imaging to analyze 163 two-rooted mandibular molars. The aspect ratios of the roots at the apical 3-mm level were categorized as "< 2.75" or "≥ 2.75" (mesial) and "< 1.75" or "≥ 1.75" (distal). A two-dimensional (2D) analysis focused on four apical axial cross-section levels to determine the presence of main and accessory canals and isthmus. Additionally, a three-dimensional (3D) assessment of the apical 4-mm of both roots examined main and accessory canals, apical foramina, apical deltas, and middle mesial canals. RESULTS: Mesial roots with aspect ratios ≥ 2.75 showed a higher number of main canals at all levels compared to those with aspect ratios < 2.75 at the 3-mm level. Additionally, the ≥ 2.75 group exhibited more accessory canals and a higher average number of accessory canals. The 3D assessment confirmed significantly more accessory canals and apical foramina in the ≥ 2.75 group. The prevalence of roots with apical deltas was nearly double in the ≥ 2.75 group, and middle mesial canals were exclusively found in this group. In the distal root, the ≥ 1.75 group showed a significantly higher number of main canals at all axial levels. No significant differences were observed between groups in terms of accessory canals, apical foramina, or deltas. CONCLUSIONS: A higher root aspect ratio is related to higher anatomical complexity.


Assuntos
Cavidade Pulpar , Mandíbula , Dente Molar , Raiz Dentária , Microtomografia por Raio-X , Microtomografia por Raio-X/métodos , Humanos , Dente Molar/diagnóstico por imagem , Dente Molar/anatomia & histologia , Mandíbula/diagnóstico por imagem , Mandíbula/anatomia & histologia , Raiz Dentária/diagnóstico por imagem , Raiz Dentária/anatomia & histologia , Cavidade Pulpar/anatomia & histologia , Cavidade Pulpar/diagnóstico por imagem , Imageamento Tridimensional/métodos , Ápice Dentário/diagnóstico por imagem , Ápice Dentário/anatomia & histologia
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