In maxillary 1st permanent molar, the 2 obtuse angles are
## **Core Concept**
The maxillary first permanent molar has a specific morphology that includes its cusps, grooves, and angles. Understanding the anatomical features of teeth is crucial in dental anatomy and restorative dentistry. The question focuses on identifying the two obtuse angles of this tooth.
## **Why the Correct Answer is Right**
The maxillary first permanent molar typically has a rhomboid shape when viewed from the occlusal aspect. This tooth has four major cusps (two buccal and two palatal) and its occlusal surface is characterized by specific angles. The two obtuse angles are the mesiolingual and distobuccal angles. This morphology is significant for the tooth's function and its interaction with opposing teeth.
## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it does not accurately represent the obtuse angles of the maxillary first permanent molar.
- **Option B:** This option is incorrect as it mistakenly identifies the angles, which does not align with the anatomical features of the tooth.
- **Option D:** This option is incorrect because it also fails to correctly identify the two obtuse angles of the maxillary first permanent molar.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the maxillary first molar's morphology, including its cusps and angles, is essential for understanding occlusion and for dental restorations. The identification of obtuse angles helps in the classification and identification of teeth, which is critical in dental anatomy.
## **Correct Answer:** . mesiolingual and distobuccal angles