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BDS 2: Oral Ecosystems > OE L13 Eruption Patterns > Flashcards

OE L13 Eruption Patterns Flashcards

1
Q

What are the 4 stages of tooth eruption?

A
  1. Pre-eruptive phase
  2. Intra-osseus eruption
  3. Mucosal penetration
  4. Supra-osseus eruption
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2
Q

What sequence do the deciduous teeth erupt in?

A
  1. A
  2. B
  3. D
  4. C
  5. E

Mandibular teeth erupt before maxillary teeth

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3
Q

Tooth A eruption, calcification beginning and enamel completion dates

A
  1. 6-10 months
  2. 4 months iu
  3. 2 months
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4
Q

Tooth B eruption, calcification beginning and enamel completion dates

A
  1. 8-12 months
  2. 4 and a half months iu
  3. 3 months
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5
Q

Tooth D eruption, calcification beginning and enamel completion dates

A
  1. 12-15 months
  2. 5 months iu
  3. 6 months
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6
Q

Tooth C eruption, calcification beginning and enamel completion dates

A
  1. 18-20 months
  2. 5 months iu
  3. 9 months
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7
Q

Tooth E eruption, calcification beginning and enamel completion dates

A
  1. 24-36 months
  2. 6 months iu
  3. 12 months
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8
Q

What sequence do the teeth of the mandibular arch erupt in?

A

Mandibular arch

  • 1st molar
  • central incisor
  • lateral incisor
  • canine
  • 1st premolar
  • 2nd premolar
  • 2nd molar
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9
Q

What sequence do the teeth of the maxillary arch erupt in?

A

Maxillary arch

  • 1st molar
  • central incisor
  • lateral incisor
  • 1st premolar
  • 2nd premolar
  • canine (long distance to travel)
  • 2nd molar
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10
Q

Eruption dates of the teeth of the mandibular arch

A 
6-7: first molar
6-7: central incisor
7-8: lateral incisor
9-10: canine
10-12: 1st premolar
11-12: 2nd premolar
11-13: second molar
17-21: third molar
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11
Q

Eruption dates of the teeth of the maxillary arch

A 
6-7: first molar
7-8: central incisor
8-9: lateral incisor
10-11: 1st premolar
10-12: 2nd premolar
11-12: canine
12-13: 2nd molar
17-21: 3rd molar
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12
Q

Are these eruption dates completely accurate?

A

No they are approximate, give or take 6 months.

Teeth also tend to erupt sooner in girls than boys.

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13
Q

Dates of calcification beginning in permanent dentition

A

Calcification date =

crown eruption date minus 6/7 years

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14
Q

Dates of crown completion (enamel completion) in permanent dentition

A

Crown completion date = crown eruption date minus 3/4 years

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15
Q

Root development in decidous teeth

A

Roots complete 12 months after eruption

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16
Q

Root development in permanent dentition

A

Roots complete 3 years after eruption

17
Q

What does root development entail?

A

Root apex closes.

Walls of root change from thin to thick.

18
Q

Describe the first stage of eruption: pre-eruptive phase.

A
  • Tooth remains in bony crypt
  • Initiation of root formation stimulates dental follicle to initiate tooth eruption
  • Dental follicle recruits growth and transcription factors and hormones for osteoclastogenesis and osteogenesis
19
Q

Describe the second stage of eruption: intra-osseus eruption.

A
  • Bone resoprtion on coronal side of the tooth creates an eruption pathway
  • Bone is deposited in apical follicle, translocating tooth occlusally
  • Bone deposited in bucco-lingual aspect forming dento-alveolar process
20
Q

Describe the third stage of eruption: mucosal penetration.

A
  • As tooth reaches mucosa, reduced enamel epithelium fuses with oral epithelium to form CT complex which eventually becomes an epithelial plug
  • Cells of enamel epithelium form an epithelial lined canal through which the tooth erupts, means eruption without bleeding
  • Junctional epithelial cells transform to squamous mucosal cells with time
21
Q

Describe the fourth stage of eruption: supra-osseus eruption phase.

A
  • Tooth continues to erupt at fast rate of 25-75um per day
  • Movement occurs when sleeping
  • Drift continues throughout life due to remodelling of the periodontal ligament
  • PDL contains the chemical mediators required for tooth movement
22
Q

What factors control the speed of intra-osseus movement?

A
  • Genetic factors
  • Local environmental factors e.g. crowding, trauma, supernumeraries or cysts, premature loss of deciduous teeth
  • Distance a tooth must travel e.g. upper canine longest distance, 1st permanent molar shortest distance
23
Q

What is the pathway in the alveolar bone called?

A

The gubernacular canal.

Directional patway allowing movement of permanent tooth upwards, widened by bone resorption.

24
Q

What does the gubernacular canal contain?

A

A structure called the gubernacular cord.

Contains remnants of the dental lamina and connective tissue.

BDS 2: Oral Ecosystems (42 decks)

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