Localized Disturbances in Eruption Flashcards
What is the alteration of normal eruption path?
a. ectopic eruption
b. impaction
c. primary retention
d. secondary retention
a. ectopic eruption
What is the cessation of eruption due to physical barrier such as bone, teeth, soft tissue (gum)?
a. ectopic eruption
b. impaction
c. primary retention
d. secondary retention
b. impaction
What is cessation of eruption after emergence?
a. ectopic eruption
b. impaction
c. primary retention
d. secondary retention
d. secondary retention
What is cessation of eruption prior to emergence?
a. ectopic eruption
b. impaction
c. primary retention
d. secondary retention
c. primary retention
What is the prevalence of an ectopic eruption of a 1st permanent molar?
- 5% in general population
- 22% in cleft patients
- 20% in siblings of patients with ectopic eruption
What are the most common etiologies of 1st permanent molar ectopic eruption?
greater mesial angulation and/or greater width of 1st permanent molar
T/F: Self-correction is usually not possible in 1st permanent molar ectopic eruption.
False!
2/3 actually self-correct
How do you treat a mild ectopic 1st permanent molar?
observe
How do you treat a moderate ectopic 1st permanent molar?
brass ligature, spring clip, distalizing appliance
How do you treat a severe ectopic 1st permanent molar?
extract primary molar, distalize permanent molar
Which side do ectopic mandibular incisors typically erupt?
lingually
What is ectopic mandibular incisors often a good indication of?
incipient crowding
What is the treatment ectopic mandibular incisors?
extract primary incisors (all 4) due to insufficient space (and possibly canines- serial extraction)
How do teeth get self-corrected?
normal activity and placement of the tongue to push teeth out counteracted by lips and cheeks pushing in
When do we only extract the central incisors (not laterals) in ectopic mandibular incisors?
when there is enough space
When do we take a pano if thought to have ectopic teeth?
mixed dentition
don’t go by age, go by mixed dentition
Why is it important that we detect ectopic canines as early as we can?
20% result in severe root resorption of adjacent teeth
What’s a popular treatment for ectopic permanent canine?
palatal expansion
- slow palatal expansion (wires outside mouth)
- rapid palatal expansion (screws inside mouth )
What is success rate of rapid palatal expander (RME)? What is success rate with no tx?
RME= 65.7%
no tx= 13.6%
What are the other treatment options for ectopic maxillary canines?
- extract primary canines and first molars
- if class II molar relationship, headgear
- flap the gum tissue to expose the canine and put brackets on it to pull towards correct position. ACTIVE
- surgically expose/put hole and allow exposure down to CEJ so they grow correctly. PASSIVE
What is the name of the stage preceding the eruption of permanent canines?
ugly duckling stage
Why is laterals erupting before centrals bad?
Not the normal eruption sequence. Centrals usually erupt before lateral
Where should you expose the tooth if trying to cause eruption?
below the mucogingival line because if above the line, no keratinized tissue and will continue to have recession and can lose bone
What is ankylosis?
union of tooth root to alveolar bone due to lack of PDL
What will happen if you put braces on an ankylosed tooth?
brackets on the an ankylosed tooth can cause everything to move
What are the steps of a submerged tooth?
first undergo variable degrees of root resorption and then become ankylosed to bone
What is the most commonly affected tooth for ankylosis of deciduous teeth?
mandibular second deciduous molar
