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The mandibular first molar is the largest tooth in the mandibular arch. It is usually the first permanent tooth to erupt at age of 6 year. It has five well developed cusps: two buccal, two lingual, and one distal. It has two well-developed roots, one mesial and one distal, which are very broad buccolingually. These roots are widely separated at the apices. The distal root is smaller and usually more rounded than the mesial root........
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