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Classes of teeth, Dentention, WhatsApp Image 2020-12-24 at 3.05.47 PM (1),…
Classes of teeth
Posterior
Molars
6 in the upper arch
6 in lower arch
Function
1-The mastication of food
2-Maintaining vertical dimension of the face
Premolars
4 in the upper arch and have three roots.
4 in lower arch and have two roots.
Interior
Incisors
4 uppers and
4 lower
Central incisors
Lateral incisors
Function
1- cutting food
2 articulating speech
3- appearance
4- support of the lips
Canines
2 uppers 2 lowers
In traditional restorative dentistry they are the cornerstones of the dental arch
Function
1- support the lips
2- cutting or shearing of food
3- guideposts in occlusion
Dentention
Primary dentation
Eruption of Maxillary Canine
This self - correcting malocclusion is seen around 8 to 11 years of age
This condition corrects itself after the canines have erupted.
This is called as ugly duckling stage or Broadbent phenomenon.
As the permanent maxillary lateral incisors mesially.This force is transmitted to the central incisors and their roots are also displaced mesially.
Spaces
Primate spaces also called: Anthropoid- Simian
Mixed to maxillary deciduous canines
Distal to mandibular deciduous canines
Physiological spaces present in between all the teeth
Maxillary arch
0 to 8 mm (average 4 mm)
Mandibular arch
1 to 7 mm (average 3 mm)
The importance of the primary teeth
Help in speech
Attractive appearance
Chewing and eating
Healthy primary teeth allow normal development of the jaw bones and muscles, save space for the permanent teeth, and guide them into place
Decayed primary teeth can cause pain and abscesses, infections, and can spread to the permanent teeth
Permanent dentition :
Accessional teeth
Permanent molars replace nothing
Succedaneous
Permanent molars replace decidouos teeth
Composed of 32 teeth
16 Upper
Half of a dental permanent called: Quadrant
16 Lower
Mixed dentition
Composed of both
primay and permanent teeth
Permanent teeth start to appear from the age 6 to (12-13)years
