The permanent maxillary first molar presents an occlusal surface shaped as___________?
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Answer: D. Rhomboidal
Explanation
The occlusal outline of a permanent maxillary first molar resembles a rhombus. It features two acute angles and two obtuse angles at opposite corners. This geometric shape is created by the arrangement of its four main cusps. Occlusal tables of posterior teeth are often categorized by standard geometric shapes. The four major cusps include mesiolingual, distolingual, mesiobuccal, and distobuccal. Developmental grooves cross the occlusal surface connecting various fossae and pits.
Restorative dentists must reproduce rhomboidal occlusal anatomy during crown fabrication. Occlusal caries frequently initiates within the deep developmental grooves of molars. Anatomy recognition aids in identifying extracted teeth during forensic dental examinations. Oval shapes describe different premolar or molar crown outlines found elsewhere. Trapezoidal outlines describe facial and lingual aspects rather than occlusal views. Triangular outlines characterize certain premolars or anterior tooth incisal edges.
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Answer: C. Cervical embrasure
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Answer: C. Misnomer
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Q3. The primary first molar tooth features its sharpest cusp located at____________?
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Answer: C. Mesiolingual
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Q4. Any curvature present in the root of maxillary lateral incisors typically points in which direction ?
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Answer: A. Distal
Root apices of permanent maxillary lateral incisors consistently curve toward the distal side. Morphological surveys of extracted teeth confirm this predominant directional apical root deviation pattern. Developmental di...
Q5. Primary teeth generally make their initial appearance in the oral cavity in the order of____________?
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Answer: C. Central incisors, lateral incisors, first molars canines, second molars
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Q6. Primary teeth undergo the exfoliation process during the timeframe between_____________?
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Answer: D. Seventh and Twelfth years
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