3. Primary dentition. Formation, time of eruption, characteristics and development. Flashcards
What is the primary dentition stage?
The primary dentition stage starts with the eruption of the first deciduous tooth at about 6 months of age and continues until the eruption of the first permanent tooth around 6 years of age.
What factors control primary teeth calcification?
Genetic factors, developmental variability, and sexual dimorphism.
What is the normal sequence of eruption of primary teeth?
- Central incisors
- Lateral incisors
- First molars
- Canines
- Second molars
At what age do most children have 20 primary teeth present?
By 2 years of age.
What is the status of root formation of deciduous teeth by 3 years of age?
The roots of all the deciduous teeth are complete.
What indicates future occlusion status at 3 years of age?
An excessive overbite, where the upper incisors almost hide the lower incisors.
What is ‘developmental spacing’ in primary dentition?
Spacing in the upper and lower anterior segments that is usual and desirable to accommodate larger permanent teeth.
What are primate spaces?
Spaces present in the primary dentition between the deciduous lateral incisors and canines in the maxillary arch and between the primary canine and primary first molar in the mandibular arch.
What is the age of eruption for primary lower central incisors?
6-8 months.
What is the age of eruption for upper central incisors?
9 months.
Fill in the blank: The first molars typically erupt at _______ months.
15
What is the age of eruption for second molars?
26 months.
True or False: The permanent first molars erupt before the deciduous incisors are shed.
True.
What can cause loss of arch length in the dental arch?
Caries.
What is the age of eruption for lower lateral incisors?
7 months.
Fill in the blank: The dental arch is _______ shaped.
Semi-circular
What is the typical age for the completion of root formation of deciduous canines?
3¼ years.
