Permanent Tooth Development And Eruption

Question 1

When does the formation of permanent dentition begin?

Answer 1

Starts in utero around week 20

Question 2

When does calcification of permanent dentition begin?

Answer 2

Begins at 3 to 4 months and continues until the third molars start to calcify

Question 3

What is the timeframe of the eruption of the permanent Dentition?

Answer 3

Takes place age 6 to 21 years

Question 4

What is the timeframe for permanent dentition to completely irrupt with fully formed the roots?

Answer 4

Takes place from age 7 to 25 years

Question 5

What are succedaneous teeth?

Answer 5

Permanent teeth that replace the primary predecessors.

Question 6

What is the position of forming succedaneous incisors and canines?

Answer 6

They form LINGUAL to the deciduous anterior teeth

Question 7

What is the position of forming succedaneous premolars? Let 

Answer 7

They form APICALLY within the trifurcation/bifurcation of deciduous posterior teeth

Question 8

What is the position of forming non-succedaneous permanent molars?

Answer 8

Form distal and apical to the deciduous posterior teeth

Question 9

What is the Axial movement in the eruption stage?

Answer 9

The course of direction the erupting tooth takes is overall occlusally

• succedaneous anteriors move occlusally and labially
• Succedaneous premolars move occlusally

Question 10

What are the first permanent teeth to irrupt and at what age does this happen?

Answer 10

• First molars maxillary and mandibular
• Mandibular central incisors can erupt before or with The mandibular first molar

Happens around age 6 to 7 years


Question 11

Do mandibular or maxillary teeth erupt first?

Answer 11

Mandibular teeth usually erupt before the maxillary teeth. Similar to the primary dentition

Question 12

Characteristics/anomalies of the permanent Dentition

Answer 12

Normal wear
Attrition
Bruxism
Abrasion
Erosion
Abfraction
Early eruption
Late eruption
Congenitally missing teeth
Retained teeth
Diastema
Generalized spacing
Insufficient space

Question 13

What is normal wear in the permanent dentition?

Answer 13

Slight incisal/occlusal wear, natural wearing process of mastication

Teeth maintain their shape

Question 14

What is attrition in the primary dentition?

Answer 14

Excessive occlusal wear/moderate occlusal wear from a heavy bite

Question 15

What is bruxism in the primary dentition?

Answer 15

Excessive traumatic attrition due to grinding or clenching/severe occlusal wear

Question 16

What is abrasion in the primary dentition?

Answer 16

Excessive mechanical wear

The mechanical wearing away of the tooth surface by forces other than mastication

Question 17

What is erosion in the permanent Dentition?

Answer 17

Excessive chemical dissolution of enamel/Dentin/cementum by a chemical process other than bacterial

Question 18

What is abfraction in the primary dentition?

Answer 18

Loss of tooth structure by bio chemical loading forces

Flexure and chemical fatigue of cervical enamel and/or Dentin distant from the loading point

Question 19

Early eruption in the permanent dentition

Answer 19

Not a benefit, teeth are less calcified

Question 20

Late eruption of the permanent Dentition

Answer 20

Great benefit, teeth are highly calcified

Question 21

What are retained teeth?

Answer 21

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

Question 22

What is a diastema?

Answer 22

A large space ranging from .5 mm to several millimeters, usually between the maxillary central incisors

Question 23

What is generalized spacing?

Answer 23

Normal arch with small teeth; similar to primate spacing of the primary dentition

Question 24

What is microdontia?

Answer 24

A normal Arch with small teeth

Question 25

What results from insufficient space in the primary dentition? What are the causes?

Answer 25

Results in different degrees of crowding

• May be caused by a premature loss of primary tooth/teeth
• normal size dental arches with large teeth
• an under developed arch with normal size teeth

Question 26

What is macrodontia?

Answer 26

Normal size dental arches with large teeth

Question 27

What are some oral habits that may change the shape of the dental arch and/or the position of the permanent dentition?

Answer 27

Finger and thumb sucking

Tongue thrust swallowing pattern