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115 Oral, Head And Neck Anatomy > Primary Tooth development and eruption > Flashcards

Primary Tooth development and eruption Flashcards

1
Q

Where does the development of teeth take place?

A

In the maxillary and mandibular arches

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2
Q

When does primary dentition develop?

A

During both the embryonic period And fetal period

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3
Q

When does the permanent dentition form?

A

During the fetal period

Continues for years after birth, teeth have the longest developmental period of organs

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4
Q

What is enamel organ?

A

Highly specialized epithelial tissue that forms enamel

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5
Q

What are Dental papilla

A

Embryonic connective tissue that forms Dentin and pulp

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6
Q

What is the dental follicle/sac

A

Embryonic connective tissue that encapsulates the developing tooth. Forms cementum, PDL, And alveolar bone

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7
Q

What is a bone crypt or “alveoli”

A

Space in which the developing tooth forms in the developing alveolar ridge

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8
Q

What happens during the initiation stage of tooth development? When does it happen?

A

Happens at the 6th to 7th week

Main process is induction. The dental lamina connect the developing tooth bud to the epithelial layer of the mouth

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9
Q

When does the bud stage occur and what happens?

A

Happens at the eighth week

Main process is proliferation. The growth of dental lamina into a bud shape that penetrates growing extomesenchyme (emergence of enamel organs)

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10
Q

When does the cap Stage occur, and what happens?

A

9th to 10th week

This is when proliferation, differentiation, morphogenesis occur. Differentiation of enamel organ into bell shape with four cell types and dental papilla into two cell types

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11
Q

What is the apposition stage

A

Induction and proliferation occur. Dental tissue types secreted in successive layers as a matrix

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12
Q

What is the maturation stage

A

Dental tissue types fully mineralize to their mature form

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13
Q

What happens at the time of eruption?

A

The crown is completely formed and root is partially formed (neither are fully calcified)

Crown penetrates the oral mucosa and enters the oral cavity

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14
Q

What are the other words for primary/deciduous dentition. How many primary teeth are there in all?

A

Temporary, baby, milk teeth

20 teeth

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15
Q

How many teeth are in the primary dentition?

A

20 total: 4 incisors, 2 canines, 4 molars (per arch)

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16
Q

What are the functions of primary teeth?

A

Mastication
Speech
Esthetics
Saves space for succedaneous permanent teeth

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17
Q

Benefits of preventing premature loss of primary teeth

A

Maintains comfort/function
Maintains occlusion of primary teeth
Prevents malocclusion of permanent teeth

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18
Q

When does the formation of primary teeth begin?

A

In utero- 6 to 8 weeks

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19
Q

When does calcification of primary teeth begin?

A

I’m utero- 13 to 16 weeks

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20
Q

When does eruption of the primary teeth take place? When will they be completely erupted with fully formed roots?

A

From age 6-30 months

And

Age 2-3 years

21
Q

Which arch usually precedes the other in primary eruption? What is the order of appearance?

A

Mandibular is usually seen first

Central incisors
Lateral incisors
1st molars
Canines
2nd molars
22
Q

When do we see erupting dentition occur?

A

Ages 6mos- 3years. Occurs over about 2 years

23
Q

When do we see complete dentition occur?

A

Ages 3-7 years. Over the course of 5 years

24
Q

When do we see mixed dentition?

A

Ages 7-11 years. Over the course of 5 years

25
Q

What is exfoliation in primary dentition?

A
  • The shedding of deciduous teeth.
  • Precedes the eruption of succedaneous teeth
  • Roots must resorb to make room for permanent teeth and so they may shed/exfoliate
26
Q

Effects of exfoliation on the permanent dentition

A
  • Can impact occlusion of permanent teeth if primaries are lost prematurely (drifting teeth/loss of space for new teeth)
  • can also impact occlusion if they are retained for too long. Can prevent eruption or cause map position of succedaneous teeth
27
Q

What are the most unstable teeth in the primary dentition?

A 
Maxillary incisors (prey to trauma)
Max & mand molars (prey to decay)
28
Q

Common anomalies in primary dentition

A
  • Bruxism- especially on anterior teeth
  • Attrition- wear patterns
  • Primary/primate spacing- beneficial to erupting permanent teeth- gives more space
29
Q

What is mixed dentition? When does it begin and with which teeth?

A

The transition of primary to permanent dentition. Begins at about age 6 with the eruption of the mandibular central incisors and/or the mandibular first molars

30
Q

Why are the mandibular permanent first molars often the first permanent teeth to irrupt before any deciduous teeth exfoliate?

A

Because they are not succedaneous. They erupt distal to the deciduous second molars

31
Q

How many pre-molars are in the primary dentition?

A

None, they only exist in the permanent dentition. Primary molars are replaced by the succedaneous permanent pre-molars

32
Q

Characteristics of the primary maxillary first molar

A

Resembles permanent maxillary first premolar

33
Q

Characteristics of the primary maxillary second molar

A

Resembles the permanent maxillary first molar

34
Q

Characteristics of the primary mandibular first molar

A

Does not resemble any mandibular permanent posterior tooth

35
Q

Characteristics of the Primary mandibular second molar

A

Resembles permanent mandibular first molar

36
Q

How many routes are on the maxillary and mandibular primary molars?

A

Three roots on maxillary primary molars
Two roots on mandibular primary molars
Number of roots are the same as permanent molars

37
Q

Major contrasts of primary crowns to permanent crowns

A

-Overall they are smaller
-Anteriors are wider mesial to distal
-Posteriors are wider buccal to lingual
-whiter, less pigmented
-enamel is relatively thin and consistent in depth except on cervical ridges
-buccal/lingual cervical ridges are more prominent (esp on max/mand 1st molar)
-thickness of Dentin is limited but greatest in the occlusal fossa
-cervical area is narrower mesial to distal


38
Q

Major contrast of primary roots to permanent roots

A

Primary are narrower; posterior roots are widely flared

39
Q

Major contrast of primary pulp horns to permanent pulp horns

A

Primary are high and pulp chambers are large

40
Q

Major contrast of crown widths between primary and permanent teeth

A

Crowns are larger in comparison with root cervix and trunk

41
Q

Major contrast between root canals of primary and permanent teeth

A

Are long and narrow in primary teeth; molar roots flare and thin rapidly towards the apices

42
Q

 major contrast in endodontic procedures from primary teeth to permanent teeth

A

Pulpotomy- only the coronal pulp is removed from primary teeth

Pulpectomy- all pulp is removed, coronal and radicular, from permanent teeth

43
Q

What is meant by flush terminal plane? What does this allow for?

A

The primary maxillary and mandibular second molars are in an end to end relationship

Allows the proper molar relationship to occur in the permanent dentition

44
Q

What is meant by mesial step? What will this most likely allow for?

A

The mandibular second molar is mesial to the maxillary molar

Will most likely allow the proper permanent molar relationship to occur in the permanent dentition

45
Q

What is meant by distal step? Is this a beneficial relationship?

A

Primary mandibular second molar is distal to the maxillary second molar

Not a beneficial molar relationship. May prevent the proper molar relationship in the permanent dentition

46
Q

When is eruption completed?

A

When the crown of the erupting tooth contacts it’s antagonist

47
Q

When is root formation completed?

A

When the apical foramen is formed

48
Q

What is the current theory on what causes exfoliation?

A

The increased pressure/forces of maturing muscles of mastication cause the primary teeth to begin to resorb and shed

As well as the remodeling of the periodontal ligament

49
Q

Periods of stability in primary teeth

A

Is short overall. Some teeth may be lost by age 4, five teeth missing by age 6 and only six teeth remaining by age 10

115 Oral, Head And Neck Anatomy (25 decks)

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