Permanent Tooth Development And Eruption Flashcards
When does the formation of permanent dentition begin?
Starts in utero around week 20
When does calcification of permanent dentition begin?
Begins at 3 to 4 months and continues until the third molars start to calcify
What is the timeframe of the eruption of the permanent Dentition?
Takes place age 6 to 21 years
What is the timeframe for permanent dentition to completely irrupt with fully formed the roots?
Takes place from age 7 to 25 years
What are succedaneous teeth?
Permanent teeth that replace the primary predecessors.
What is the position of forming succedaneous incisors and canines?
They form LINGUAL to the deciduous anterior teeth
What is the position of forming succedaneous premolars? Let 
They form APICALLY within the trifurcation/bifurcation of deciduous posterior teeth
What is the position of forming non-succedaneous permanent molars?
Form distal and apical to the deciduous posterior teeth
What is the Axial movement in the eruption stage?
The course of direction the erupting tooth takes is overall occlusally
- succedaneous anteriors move occlusally and labially
- Succedaneous premolars move occlusally
What are the first permanent teeth to irrupt and at what age does this happen?
- First molars maxillary and mandibular
- Mandibular central incisors can erupt before or with The mandibular first molar
Happens around age 6 to 7 years

Do mandibular or maxillary teeth erupt first?
Mandibular teeth usually erupt before the maxillary teeth. Similar to the primary dentition
Characteristics/anomalies of the permanent Dentition
Normal wear Attrition Bruxism Abrasion Erosion Abfraction Early eruption Late eruption Congenitally missing teeth Retained teeth Diastema Generalized spacing Insufficient space
What is normal wear in the permanent dentition?
Slight incisal/occlusal wear, natural wearing process of mastication
Teeth maintain their shape
What is attrition in the primary dentition?
Excessive occlusal wear/moderate occlusal wear from a heavy bite
What is bruxism in the primary dentition?
Excessive traumatic attrition due to grinding or clenching/severe occlusal wear
What is abrasion in the primary dentition?
Excessive mechanical wear
The mechanical wearing away of the tooth surface by forces other than mastication
What is erosion in the permanent Dentition?
Excessive chemical dissolution of enamel/Dentin/cementum by a chemical process other than bacterial
What is abfraction in the primary dentition?
Loss of tooth structure by bio chemical loading forces
Flexure and chemical fatigue of cervical enamel and/or Dentin distant from the loading point
Early eruption in the permanent dentition
Not a benefit, teeth are less calcified
Late eruption of the permanent Dentition
Great benefit, teeth are highly calcified
What are retained teeth?
Primary/deciduous teeth that do not shed, often because there is not a primary tooth erupting behind it
This is usually a maxillary second molar or maxillary canine
What is a diastema?
A large space ranging from .5 mm to several millimeters, usually between the maxillary central incisors
What is generalized spacing?
Normal arch with small teeth; similar to primate spacing of the primary dentition
What is microdontia?
A normal Arch with small teeth
