ocr: Permanent teeth. (a) The permanent arch; key identifies each tooth by corres- ponding number, followed by approximate eruption date. (b) Permanent teeth in occlusion. 1-UR third molar, 17 to 21 years 17-LL third molar, 17 to 21 years 2-UR second moiar, 12 to 13 years 18-LL second molar, 11 to 13 years 3-UR first molar, 6 to 7 years 19--LL first molar, 6 to 7 years 4-UR second bicuspid, 10 to 12 years 20-LL second bicuspid, 11 to 12 years 5-UR first bicuspid, 10 to 11 years 21-LL first bicuspid, 10 to 12 years 6-UR cuspid, 11 to 12 years 22-LL cuspid, 9 to 10 years 7-UR lateral incisor, 8 to 9 ...
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