The Dental record . cut central incisors are shown, a state of dentition which is seen invery forward animals at the completion of one year of age. Shortly after the completion of one year, the three anterior tempo-rary molars fall irregularly ; and by the time the animal is fifteenmonths old, the three anterior permanent molars are in the mouth,and may be readily known by their sharp unworn points, and theirrecent appearance, as shown in the illustration (Fig. 49). Theseteeth are very regular in their development, and afford valuableevidence in cases where an opinion cannot be formed from ani
The Dental record . cut central incisors are shown, a state of dentition which is seen invery forward animals at the completion of one year of age. Shortly after the completion of one year, the three anterior tempo-rary molars fall irregularly ; and by the time the animal is fifteenmonths old, the three anterior permanent molars are in the mouth,and may be readily known by their sharp unworn points, and theirrecent appearance, as shown in the illustration (Fig. 49). Theseteeth are very regular in their development, and afford valuableevidence in cases where an opinion cannot be formed from aninspection of the incisors alone. z. 2 350 THE DENTAL RECORD, The next change in the dentition is the final one, and occurs betweenthe age of seventeen and eighteen months. At this period the sixthmolar, a permanent tooth, is cut; and in forward animals the lateraltemporary incisors are changed for permanent teeth. In many Fig. \().—Teeth of Pig at fifteen instances the temporary lateral teeth remain up to the age of eighteenmonths, although they are in such cases quite loose; and very oftenthe permanent teeth are cutting through the gum below or by the side THE DENTAL RECORD. 357 of them ; in other instances one lateral is found to be fully up andnearly level with the centrals, while the other is just pushing throughthe gum. The sixth molar is also fairly up, but the posterior part ofits crown is not quite clear from the gum. These changes completethe permanent dentition of the pig, and there are no indications ofthe age afforded by the teeth after this period, excepting such asdepend on the growth and wear of the organs. In the next illustration (Fig. 50) the sixth molar is shown as itappears at the completion of the age of eighteen months. Fi. 50.—Molars of Pig at eighteen months.
Size: 1313px × 1903px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, bookpublisherlondon, bookyear188
