Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
32 Cards in this Set
- Front
- Back
|
3 phases of tooth movement?
|
1. Pre-eruptive
2. Eruptive 3. Post-eruptive |
|
|
Successional tooth develops where in relation to primary tooth?
|
Successional tooth develops lingually
|
|
|
What is pre-eruptive movement?
|
Tooth movement prior to eruption
|
|
|
What causes pre-eruptive movement? (2)
|
1. Neighboring crowns (crowding)
2. Mandible & maxilla growth |
|
|
Premolars develop where in relation to primary molars?
|
Develop lingual & drift inferiorly
|
|
|
During development permanent maxillary molars slant...?
|
Distal
|
|
|
During development permanent mandibular molars slant...?
|
Mesial
|
|
|
When permanent molars erupt, erupt in which direction?
|
Vertically-- straight up
|
|
|
Why do permanent molars slant during developing?
|
Bone is too small, but growth prior to eruption allows them to come in straight
|
|
|
What allows PDL collagen fiber remodeling during eruption?
|
Fibroblasts
|
|
|
CT structure which is reminant of dental lamina?
|
Gubernacular cord
|
|
|
Gubernacular cord extends through small opening in bone known as?
|
Gubernacular canal
|
|
|
What is the purpose of the gubernacular cord?
|
To guide tooth as its erupting
|
|
|
Gubernacular canal is widened by what type of cell activity?
|
Osteoclast activity
|
|
|
Proposed causes of tooth eruption? (6)
|
1. Root formation
2. Hydrostatic pressure 3. Bone remodeling 4. Dental follicle 5. PDL 6. Ankylosis |
|
|
What is eruptive tooth movement?
|
Tooth movement from root formation to occlusal contact
|
|
|
When tooth erupts toward oral cavity what happens to reduced enamel epithelium?
|
Reduced enamel epithelium fuses w/ oral epithelium
|
|
|
What halts eruption?
|
Occlusal contact
|
|
|
Purpose of post-eruptive tooth movement? (5)
|
1. Maintain tooth position
2. Accomodate for bone growth 3. Compensation for occlusal wear 4. Interproximal wear 5. Root completion |
|
|
How long does it take for root completion in primary teeth?
|
1-1.5 years
|
|
|
How long does it take for root completion in permanent teeth?
|
2-3 years
|
|
|
What type of changes may occur when bone growth is accomodated for in post-eruptive tooth movement?
|
Bone deposition at alveolar crest & floor of bony socket --> push tooth upward
|
|
|
When do you get increase in cementum in apex of root?
|
Following post-eruptive tooth movement or causing tooth movement
|
|
|
Mixed dentition occurs between what ages?
|
6-12 years
|
|
|
Where are permanent anterior teeth located in relation to primary teeth during pirmary root resorpiton?
|
Lingual to primary anterior teeth
|
|
|
Where are permanent premolars located in relation to primary molars during primary root resorption?
|
Below primary molars
|
|
|
Which cells are responsible for primary root resorption ?
|
Odontoclasts (osteoclasts)
|
|
|
In order for primary tooth to be shed, what must happen? (2)
|
1. Primary tooth root must be resorbed
2. PDL fibers must be lost |
|
|
What resorbs collagen fibers of PDL?
|
Fibroblasts
|
|
|
What stimulates osteoclastic activity stimulate resorption?
|
Pressure from successional tooth on primary root
|
|
|
Types of abnormal tooth movement? (3)
|
1. Premature eruption & shedding
2. Delayed eruption & shedding 3. Orthodontic |
|
|
Delayed eruption & shedding can be due to? (3)
|
1. Eruption cysts
2. Crowding 3. Drift |
