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DH 101 > Chapter 6-2 Tooth development and Eruption > Flashcards

Chapter 6-2 Tooth development and Eruption Flashcards

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1
Q

When does root development begin

A

After crown is completely formed and tooth begins to erupt

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2
Q

What structure is responsible for root development

A

Cervical loop

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3
Q

What is the cervical loop consists of

A

Inner enamel epithelium and outer enamel epithelium

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4
Q

What is the Hertwig Epithelial Root Sheath (HERS)

A

Elongated cervical loop that encloses dental papilla tissue

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5
Q

What is te HERS responsible for

A

Shaping roots by inducing dentin formation of root area

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6
Q

Outer dental papilla cells undergo what processes (2) to become what?

A

Undergo induction and differentiation to become odontoblasts

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7
Q

What does HERS induce?

A

Odontoblastic differentation

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8
Q

Odontoblasts undergo what to do what?

A

Undergoes dentinogenesis to begin secreting predentin

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9
Q

When root dentin formation is complete what occurs?

A

Basement membrane disintgetration
HERS disintegration
Rise of ERM from HERS

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10
Q

What is Epithelial rests of Malassez (ERM)

A

Cells that form from disintegrated HERS cells

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11
Q

What do ERM cells end up in?

A

Periodontal ligament (PDL)

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12
Q

Order of layer formation

A

Dentin, cementum, Pulp

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13
Q

Cementum formation begins with?

A

Cementoblasts undergoing cementogenesis which causes appositional growth of cementum in tooth area when HERS disintegrates

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14
Q

Explain the process of cementogenesis

A

Lays down cementum matrix or cementoid

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15
Q

What happens to cementoblasts during cementum formation

A

Become trapped in the cementum they produce

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16
Q

Dentinocemental junction (DCJ) occurs as a result of what?

A

Apposition of cementum over dentin

17
Q

What cells form the pulp?

A

Central cells of dental papilla

18
Q

What structure causes teeth to develop multiple roots?

A

Differential growth of HERS

19
Q

What determines the number of roots the mature tooth will have?

A

Number of extensions of the cervical loop

20
Q

Ectomesenchyme from dental sac begins to form what two structures?

A

Periodontal ligament (PDL) and tooth sockets

21
Q

What is Sharpey’s Fibers

A

Mineralized ends of PDL; portion that is inserted into the cementum and alveolar process (bone)

22
Q

Define Eruption

A

Vertical movement of tooth eruption

23
Q

After enamel growth ceases in crown of tooth what occurs?

A

Ameloblasts place acellular dental cuticle on newly formed outer enamel surface

24
Q

During tooth shedding, what occurs to the layers of enamel organ

A

The enamel organ condenses into one layer called Reduced Enamel Epithelium (REE)

25
Q

What occurs after REE forms?

A

Tooth begins eruption into oral cavity

26
Q

Describes the steps of eruption process (2)

A
  1. REE fuses with oral epithelium
  2. Enzymes of REE disintegrate central part of the fused tissue - forming the Gubernacular canal
27
Q

What is the Gubernacular Canal?

A

Protective epithelial-lined eruption tunnel where the tooth erupts through

28
Q

What is the initial junctional epithelium and what does it do?

A

Fused tissue near the CEJ; creates seal between the tissue and tooth surface

29
Q

What is the initial junction epithelium later replaced by?

A

Definitive junctional epithelium

30
Q

In what direction do succedaneous permanent teeth develop?

A

Lingually to primary teeth except permanent maxillary incisors which develop facially

31
Q

What are osteoclasts

A

absorb alveolar process

32
Q

What are odontoclasts

A

tooth root resorption; removal of dentin and cementum

33
Q

What is the nasmyth membrane

A

Green gray residue formed on newly erupted teeth; consists of fused tissue of the REE and oral epithelium

DH 101 (11 decks)

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