According to Angle's classification,the permanent maxillary first molar is considered the key to occlusion.In the primary dentition,the second molar is used to evaluate the occlusion.

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Both statements are accurate. Angle's classification indeed uses the permanent maxillary first molar as the key to occlusion in permanent dentition. In the primary dentition, the second molar is used to evaluate occlusion, serving a similar role to the first molar in permanent dentition.

According to Angle's Classification,the Permanent Maxillary First Molar Is Considered