The teeth of the Labrador
The labrador adult has 42 teeth, 20 in the upper jaw and 22 in the lower jaw.Teeth is different from the dentition which is the phenomenon of eruption of teeth in different stages of life.
The teeth are hard, of bony appearance, and play an important functional role as they serve to arrest, tear and grind food. Dogs are heterodentals mammals, ie, they have teeth differentiated for specific uses. Molars are permanent teeth, while the incisors, canines and premolars may fall.
The dental formula for half jaw is: I 3 / 3, C 1 / 1, PM 4 / 4, M 2 / 3. The incisors, bulkier in the maxilla than in the bottom are called starting from the median plane: clamp, middle and end. The canines are conical, but are thinner in the puppy. The fourth upper premolar and first molar are highly developed and are called carnassial.
The dental formula for puppy teeth is: I 3 / 3, C 1 / 1, PM 4 / 4. The puppy does not have teeth at birth. It begins to acquire teeth on the 20th day of life. The sequence of appearance is as follows (using the example of a medium sized dog): canines appear after three weeks, then PM3 and PM4 premolars appear at 3 to 4 weeks, the medium forceps and the PM2 appear at 4 to 6 weeks. The PM1 occurs by 4 months and remains in the adult. Then all the teeth are replaced in the 3rd and 5th month. Indeed, the first teeth are lost due to resorption of their roots, and are replaced by permanent teeth.
The eruption of the molars, the incisors and canines produces between 4 and 5 months old, the jaw M2 at 5th month, the upper M2 and MP, on the 5th to 6th month and the last molars on the 6th to 7th month.
Eruption dates may vary depending on the breed. The teeth are likely to have abnormalities in their numbers. The increase in the number of teeth is rare. The most frequent decline may cause the rejection of confirmation. The absence of certain molars is common. The functional significance of these teeth is increasing in importance from front to back and the first premolar is often absent. It is also possible to notice the absence of one or two incisors, especially in small breeds.
The upper and lower arches of the jaws are embedded within each other and there cannot be observed lateral movements. The upper incisors partially cover the incisors of the lower part. In the case of a real or undershot lower, the jaw goes foward beyond the upper. By contrast, in some cases the upper teeth are abnormally ahead of the lower.
Teeth are important for determining the age of a dog. The incisors have a crown so trilobultada, like a lily. With age, the first incisor levels off (middle lobe wear) and then it erodes (disappearance of the three lobes). Given these elements, it is possible to determine the age of a dog with the help of a dental chart.
Plaque is a buildup of calcium salts in saliva at the base of the teeth. It causes gingivitis and can lead to tooth loss. The teeth are yellowish in older individuals and those suffering from serious diseases treated with antibiotics. The laminate descaling is due to certain diseases. Caries are rare, since the enamel is very hard. The dental fistulas are due to alveolar wall necrosis and causes abscesses. The persistence of primary teeth can alter the development of replacement teeth.