<prompt> In mixed dentition analysis, which tooth is used for classification?Primary 1st molarPrimary 2nd molarPermanent 1st molarAny of 2 or 3  <response>: The first permanent teeth to erupt into oral cavity is permanent first molar. From that phase of dentition, it is called as mixed dentition.Once the first permanent molar erupts into occlusion, it is used for the classification of malocclusion. 