Tooth Eruption

Question 1

Tooth eruption

Answer 1

Process assoc w root devt, devt teeth move from area of formation inside the jaw into the oral cavity to become part of the dental arch

Question 2

3 conditions of teeth w arrested eruption

Answer 2

1. Impaction
2. Primary retention
3. Secondary retention

Question 3

Definition and cause of Impaction

Answer 3

Caused by detectable physio or physical barrier in path eruption or due to abnormal tooth position

Occurs due to lack of space that arises as a result of collision bet devt teeth

Question 4

Definition and cause of primary retention

Answer 4

Normally developed and placed tooth or tooth germ before gingival emergence w/o a physical barrier in eruption path

Caused by disturbance in dental follicle that fails to initiate metabolic events responsible for bone resorption

Question 5

Secondary retention

Answer 5

After gingival emergence without ectopic eruption or physical barrier in eruption path

Question 6

Other barriers may prevent interruption

Answer 6

Cysts, crowded tooth germ or teeth, supernumerary, odontomas

Question 7

Unerupted teeth

Answer 7

Did not perforate the oral mucosa (with or without apex closure)

Question 8

Embedded teeth

Answer 8

Did not erupt because of lack of eruptive force

Question 9

Def and cause of secondary retention

Answer 9

After gingival emergence without ectopic eruption or physical barrier in eruption path

Caused by trauma, infection, genetics, ankylosis, disturbed local metabolism

Question 10

Reimpaction

Answer 10

Tooth has completely erupted in the occlusal plane and then submerged again into the bone, producing clinicala spect of infra occlusion

Question 11

Submerged teeth

Answer 11

Teeth that have undergone root resorption and are ankylosed to the alveolar bone after gingival emergence

Question 12

Reinclusion

Answer 12

Tooth is unable to maintain continuous eruptive potential as jaws grow

Question 13

Treatment for 3 conditions of impacted tooth

Answer 13

1. Orthodontic correction
2. Space augmentation
3. Removing physical barrier
4. Surgical modalities

Question 14

Types of eruption abnormalities

Answer 14

1. Premature
2. Delayed
3. Embedded
4. Eruption sequestrum
5. Impacted

Question 15

Premature eruption

Answer 15

Tooth erupt into the oral cavity before the normal time of eruption

Question 16

Natal teeth

Answer 16

Primary teeth present at birth

Question 17

Neonatal teeth

Answer 17

Teeth that erupt during the 1st 30 days of life

Question 18

Delayed eruption

Answer 18

Tooth erupts into the oral cavity at a later time that what is normally expected

Question 19

Embedded tooth

Answer 19

Fails to erupt for no cause & w/o any signs and symptoms

Question 20

Eruption sequestrum

Answer 20

Small fragment of necrosed bone sometimes seen overlying an erupting tooth

Caused by lack of complete resorption of overlying bone during eruption

Question 21

Impacted tooth

Answer 21

Tooth that us prevented from completely erupting into normal functional position due to lack of space, obstruction by another tooth, or abnormal eruption path

Question 22

Theories of impaction

Answer 22

1. Orthodontic theory
2. Phylogenic theory
3. Mendelian theory
4. Pathological theory
5. Endocrinal theory

Question 23

Orthodontic theory

Answer 23

Normal growth of jaw and movement of teeth are in a forward direction. Anything that interferes with its devt will cause impaction

Question 24

Phylogenic theory

Answer 24

Current change in nutritional habits resulted in decrease in the size of both jaws which leads to insufficient space for third molars to erupt

Question 25

Mendelian theory

Answer 25

States heredity as a common etiologic factor

Question 26

Pathological theory

Answer 26

Chronic infections may lead to condensation of osseous tissue which prevents normal devt of jaws

Question 27

Endocrinal theory

Answer 27

Increase or decrease in growth hormone secretion may affect size of jaws

Question 28

Basic principles of impaction

Answer 28

1. Any region of the dental follicle proper has the potential for initiating or regulating bone resorption and formation, or not influencing bone activity where ectopic eruption is due to abnormal activity of the dental follicle
2. Movement of teeth during eruption consists of preparing a path through bone or soft tissue & moving them along its path
3. Formation of eruption pathway is the rate-limiting step revealed by the rapid catch up eruption of the temporary unerupted teeth.

Question 29

Incidence of impaction

Answer 29

1. Mand 3rd molars
2. Max 3rd molars
3. Max canine
4. Mand PM
5. Max PM
6. Mand canine
7. Max CI
8. Max LI