. Cunningham's Text-book of anatomy. Anatomy. DECIDUOUS TEETH. 1121 1st molars appear soon after the 6th year. Central incisors appear soon after the 7th year. Lateral „ .. .. 8th „ 1st premolar 2nd Canine ,, 2nd molar 3rd from the 9th 10th 11th 12th 17th to 21st year, or even later. Variations in the Number of the Teeth.—The presence of an additional tooth is by no means uncommon. It may appear in connexion with the incisor, premolar, or the molar groups. A distinction is drawn between " supernumerary" or imperfect additions to the dentition and " supplemental" teeth which
. Cunningham's Text-book of anatomy. Anatomy. DECIDUOUS TEETH. 1121 1st molars appear soon after the 6th year. Central incisors appear soon after the 7th year. Lateral „ .. .. 8th „ 1st premolar 2nd Canine ,, 2nd molar 3rd from the 9th 10th 11th 12th 17th to 21st year, or even later. Variations in the Number of the Teeth.—The presence of an additional tooth is by no means uncommon. It may appear in connexion with the incisor, premolar, or the molar groups. A distinction is drawn between " supernumerary" or imperfect additions to the dentition and " supplemental" teeth which correspond in size with those with which they are associated. When a supplemental incisor appears it has an interesting bearing upon the solution of the much-debated point as to which incisor has disappeared from the primate dentition. A fourth molar is occasionally present. Dentes Decidui. temporary or milk) are twenty in number, five in each half of each jaw—namely, two 1st molar Canine Lateral incisor Central incisor Central incisor / Lateral incisor Canine 2nd molar 2nd molar crown The deciduous teeth ( ten above and ten below, or incisors, one canine, and two molars. They may be dis-" tinguished from the permanent teeth by their smaller size, their well-marked and con- stricted necks, and, in the case of the molars, by the wide divergence of their roots (Fig. 887). Otherwise they corre- spond so closely to the same- named teeth of the permanent set, that they require no separ- ate description, except in the case of the molars. The first upper molar has but three tubercles on its crown—two lateral and one medial; the first lower molar has four— two lateral and two medial, and the crowns of both are flattened from side to side. The second molars of the max- illa have four, those of the mandible five tubercles each. In every case the second are much larger than the first molars. The tubercles are sharper and are separated by deeper fissures or fossre than
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
