ocr: Primary teeth. (a) The primary arch; key identifies teeth with corresponding alphabet letters, followed by approximate eruption date. (b) Primary teeth in occlusion. 4 A-UR second molar, 24 to 26 months K-LL second molar, 20 to 22 month B-UR first molar, 14 to 16 months L-LL first molar, 12 to I 14 months C-UR cuspid. 18 to 20 months M-LL cuspid, 16 to 18 months DUR lateral incisor, 9 to 11 months N-LL lateral incisor, 7 to 9 months E-UR central incisor, 7 to 9 months O-LL central incisor, 6 to 8 months F-UL central incisor, 7 to 9 months P-LR central incisor, 6 to 8 months G-UL lateral inciso ...
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