ArticleSurgical and radiologic anatomy : SRA2025
Morphologic and volumetric analysis of the isthmus in mandibular first molars of a Malaysian subpopulation: a micro-CT study.
Article in Surgical and radiologic anatomy : SRA, 2025. 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
purposeThis study investigated the morphology of isthmus in mandibular first molar of a Malaysian subpopulation.
methodA total of 140 double-rooted mandibular first molars were scanned using micro-computed tomography. Fan et al. classification was used to classify the isthmus morphology. The chi-square test was used to compare the qualitative variables. The independent samples t-test and Mann Whitney U test were used to compare the quantitative variables.
resultsThe prevalence of isthmus was 77.1%. The mesial root had the majority of isthmuses [135 (89.4%)]. Of these, 65.2% were "Mixed" type. The distal roots had only 16 (10.6%) of all isthmuses. Of these, 12 (75%) were "Mixed" type. No significant difference in the type of isthmus between the mesial and distal roots (p = 0.335). However, a significant association was found between root type and the presence of isthmus (p < 0.001). There was no significant difference neither in the volume of canal part with isthmus (p = 0.703 for sheet and 0.149 for mixed types) nor in the percentage volume (p = 0.601 for sheet and 0.299 for mixed types) between the mesial and distal roots in sheet and mixed isthmus types.
conclusionIn this population, the mandibular first molar showed a high complexity in the isthmus anatomy, especially in the mesial root.
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