Which statement accurately describes the occlusal surface characteristics of the permanent first molars?

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The maxillary molar features 2 primary fossae, 2 secondary fossae, 4 triangular ridges, 1 oblique ridge, and 5 grooves.The mandibular molar contains 1 main fossa, 2 secondary fossae, 5 triangular ridges, and 4 grooves.Maxillary molars exhibit a rhomboid shape, whereas mandibular molars have a hexagonal outline.All of the above statements are correct.None of the above are true.

Explanation

The permanent maxillary first molar has 2 major and 2 minor fossae, 4 triangular ridges, an oblique ridge, and 5 grooves. The mandibular first molar has 1 major fossa, 2 minor fossae, 5 triangular ridges, and 4 grooves. Additionally, the maxillary molar’s occlusal surface is rhomboidal in shape, while the mandibular molar’s occlusal surface is hexagonal. Therefore, all the statements provided are accurate.