Persistent milk teeth

A persistent deciduous tooth is a tooth of the deciduous dentition in humans and other mammals that does not fall out due to missing or delayed resorption of the tooth root of the deciduous tooth during the change of teeth. As a result, the second tooth usually grows close to the persistent milk tooth, which leads to double dentition at this point. Therefore, laypeople also refer to this condition as double tooth . The non-placement of a permanent tooth provided according to the species-specific tooth formula , i.e. its lack in the jaw, can also be the cause of delayed resorption of the milk tooth root. The predisposition for persistent milk teeth and for their various causes is hereditary.

Double tooth in dogs ( Yorkshire Terrier ): Persistent milk canine above (recognizable by the saber shape). Before that the new canine tooth . Inflammation of the gums. If the deciduous canine remains, the new canine is too far forward. As a result, the lower canine engages too far forward and pulls the lower jaw forward. Consequence: Undershot of the lower incisors .

In this dog ( Prager Rattler ), non-failed milk teeth and second teeth lead to crowding and an additional row of teeth.

Secondary diseases

Inflammation

Food debris can accumulate between the closely spaced milk tooth and the permanent tooth and break down, which can lead to bacterial inflammation of the gums , which sometimes spreads to the roots of the affected teeth, damaging the tooth support system and causing pain when chewing.

Misalignment of the teeth

Due to erroneous teeth of the upper and lower row of teeth not failed by the mass of milk teeth that remain standing next to the second tooth, can misaligned teeth , and misalignments of the teeth are formed. If this individual teeth or cusps, which when clenching would normally be on gap directly and thereby bite with each other at high pressure loads, there will be damage to the tooth enamel and to changes in the periodontium . Incorrectly loaded teeth can shift. A bad bite may also lead to discomfort in the jaw joints .

Prevention

To prevent possible secondary diseases, the change of teeth in children and young pets should be observed. Persistent milk teeth must be professionally removed by the dentist or veterinarian in good time . Attempts to forcibly pull persistent milk teeth yourself can cause the crown to break off, leaving the tooth root stuck in the jaw, making removal much more difficult. In animals, the extraction of persistent milk teeth must be performed under anesthesia . Local anesthesia is sufficient for humans . If the failure of the permanent tooth is the cause, consideration must be given to how long the deciduous tooth that has persisted due to it should be preserved. A relatively sure exclusion criterion that a milk tooth is not a persistent milk tooth is the "loose tooth" in children of elementary school age, the mobility of which indicates that the tooth root is being broken down so that it can soon come out naturally.

Deciduous canines of a 6 month old no dog after extraction

Persistent deciduous canines are relatively common in some dog breeds . The predisposition for this is hereditary. Since the dogs have long had their teeth changed and any treatments behind them during the breeding suitability test , such undesirable genetic traits can be overlooked.

Individual evidence

^ Adolf Faller : The body of people, Thieme Verlag 1980, ISBN 3-13-329709-0 . Pages 121–123.

↑ Vet-dent.com Veterinary Dentist: Malpositions of the mandibular canini in dogs

↑ http://www.kieferorthopaedie.ukw.de/roentgen-lernprogramm/themen/unphysiologische-befunde/6-nichtanlagen-und-persistent-von-milchzaehnen.html

[1] Adolf Faller : The body of people, Thieme Verlag 1980, ISBN 3-13-329709-0 . Pages 121–123.