Pedo Week 8: Space Maintenance

Front 1

Which 5 factors are thought to influence tooth eruption?

Back 1

root formation, bone remodeling, dental follicle, pdl, and molecular determinants of tooth eruption

Front 2

During eruption of permanant teeth, what are the five activities that occur simultaneously?

Back 2

primary tooth absorbs, bone resorbs, root of perm. tooth lengthens, perm. tooth moves through the bone, and the alveolar process increases in height

Front 3

What are the two stages of tooth eruption?

Back 3

Pre-emergent eruption and post-emergent eruption

Front 4

What are the two processes necessary for pre-emergent eruption?

Back 4

resorption of bone and tooth roots above crown of erupting tooth, and eruption mechanism itself must move tooth in direction where path has been cleared.

Front 5

Following completion of their crowns, it takes ____ years for post. teeth to reach the alveolar crest.

Back 5

two-five

Front 6

Teeth usually emerge when ____ of their roots are completed. It takes _____ months to reach occlusion after reaching the alveolar margin.

Back 6

3/4. 12-20 months.

Front 7

After a tooth reaches the alveolar margin, it takes _____ months for it to reach occlusion.

Back 7

twelve to twenty

Front 8

What are the four factors that influence space loss?

Back 8

abnormal musculature, oral habits, existing malocclusion, and stage of occlusal development

Front 9

Space closure usually takes place during the first ____ months after extraction

Back 9

6

Front 10

Dental age is determined from three characteristics. What are they?

Back 10

which teeth have erupted, amount of resorption of primary teeth roots, and amount of development of permanent teeth.

Front 11

Loss of a primary molar before 7 years of age leads to ______ emergence of succedaneous tooth, whereas loss after 7 years leads to an _______ emergence.

Back 11

delayed. early.

Front 12

If the bone covering the developing permanent tooth has been destroyed by infection, emergence of the permanent tooth is usually ______.

Back 12

accelerated

Front 13

Developing premolars usually require ____ months to move through 1 mm of bone as measured on a radiograph.

Back 13

4-5.

Front 14

If a primary molar has been lost prematurely and the permanent lateral incisor is in an active state of eruption, what results?

Back 14

there is distal movement of the primary canine, which encroaches into the space needed by the first premolar.

Front 15

Describe orthodontic implant-site development

Back 15

when a tooth is congenitally missing, the edentulous space is intentionally left unmaintained. This allows adjacent perm first molar and premolar to erupt together. Ortho treatment is then used to push teeth apart to create implant space; this movement results in a strong alveolar ridge that is suitable for placing an implant.

Front 16

When is it the right time to place an implant?

Back 16

when vertical face growth stops.

Front 17

What causes space loss (5)?

Back 17

caries, extraction, ectopic eruption of first molars, ankylosis of primary molars, and trauma

Front 18

What type of space maintainer is most frequently used in Pacific Pediatric Clinic?

Back 18

Fixed, cemented appliances

Front 19

What type of space maintainer is used to span the space of a single lost tooth?

Back 19

Band and loop

Front 20

What type of space maintainer is indicated in bilateral and unilateral space loss situations in the mandible?

Back 20

lingual arch

Front 21

Which appliance has an acrylic palatal button and is indicated in the bilateral or unilateral space loss situations in the maxilla? What does the acrylic palatal button firmly contact?

Back 21

Nance holding arch. palatal mucosa.

Front 22

Which appliance has a wire traversing the palate, and is indicated in unilateral and bilateral spaces loss in the maxilla?

Back 22

transpalatal arch

Front 23

In a distal shoe appliance, what is the purpose of the shoe portion of the appliance?

Back 23

functions like the distal surface of primary second molar, acting as a guide plane for eruption of permanent first molar

Front 24

What type of distal shoe appliance is often used in our clinic?

Back 24

adjustable type (gerber)

Front 25

With loss of a primary incisor, why is space maintenance not needed?

Back 25

spaces are normally present between primary incisors, and early loss causes little change in dentition.

Front 26

Which fixed appliance works best when replacing more than two teeth?

Back 26

Groper appliance

Front 27

When a primary canine is lost, what should be done if there is minimal intercuspid crowding (<2mm) and no midline shift?

Back 27

extract remaining primary canine, place a lingual arch or add a wire distal to the lateral incisor adjacent to the exfoliated canine to prevent drift.

Front 28

When a primary canine is lost, what should be done if there is significant intercuspid crowding (>2mm) and no midline shift?

Back 28

analyze arch length to see if there is significant posterior space discrepancy. 3-4 mm discrepancy = ortho consult prior to therapy. 0 discrepancy = extract remaining canine and place lingual arch appliance.

Front 29

When a primary canine is lost and there is a midline shift, what should be done?

Back 29

ortho consult.

Front 30

The most critical time for space maintenance is when a primary first molar is loss prior to, or during, the eruption of the permanent first molar. What can occur if space is not maintained?

Back 30

Erupting permanent first molar may move primary second molar into the space. Primary canine may also drift into the space.

Front 31

If a primary first molar is lost after the eruption of the permanent first molar, the eruptive status of which tooth should be considered in the decision to place a space maintainer? explain.

Back 31

succeeding premolar. If premolar is nearing eruption (root is 1/2 to 2/3 formed), and little or no bone overlies it, no space maintenance needed. All other cases should consider space maintenance.

Front 32

What are two functions of the primary second molar?

Back 32

reserves space for permanent second premolars. it's distal root guides erupting permanent first molar into position.

Front 33

If a primary second molar is lost prior to, or during the eruption of the permanent first molar, what appliances should be used (2)?

Back 33

distal shoe (preferred in most cases), removable acrylic with gingival extension (used when multiple primary teeth are lost)

Front 34

If a primary second molar is lost after the eruption of the permanent first molar, the eruptive status of which tooth must be made to determine whether space maintenance is needed?

Back 34

succeeding bicuspid (no space maintenance needed if 1/2 to 2/3 of root is formed and no bone overlies crown)

Front 35

What are three contraindications to space maintenance appliances?

Back 35

patient non-compliance (poor oral hygeine, appts.), systemic disease, patient acceptance (patient constantly fidgets with appliance).