The subtle structural differences between your upper premolars
In short: While they may look similar at a glance, the first and second maxillary premolars possess distinct morphological blueprints. This video breaks down their surface anatomy to show how these teeth differ in root structure and cusp arrangement.
The maxillary first and second premolars are the fourth and fifth teeth from the midline, respectively. While both feature two primary cusps—the buccal and lingual—their underlying structures vary significantly. Specifically, the first premolar is known for its variable root anatomy; it possesses two roots in approximately 57% of cases, while the remaining instances feature a single wide root.
In contrast, the second premolar consistently features a single root, which is typically longer than that of the first premolar. The video provides a comparative analysis of all five surfaces—buccal, lingual, mesial, distal, and occlusal—to highlight these nuanced dental differences.
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Sources
- Summary by Intellect · source: Anatomy of Maxillary Premolars - Tooth Morphology
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