Interceptive Ortho Flashcards
Multiple teeth in anterior crossbite would suggest what?
Would you refer to orthodontist?
Skeletal component.
Yes
Why do anterior teeth erupt into crossbite?
- Trauma to primary tooth, causing ankylosis.
- Pulpectomy on primary tooth (gutta percha prevents root resorption).
- Mesiodens/supernumerary.
- Crowding.
- Tooth erupts end to end with lower incisor and deflects into a crossbite.
Why would you treat a single tooth anterior crossbite?
1) Puts the lower incisor at risk for recession.
2) If the patient occludes end to end, it can chip or traumatize the tooth.
3) Esthetic concern
What do you do if there’s no room to move the crossbitten incisor forward?
Ortho referral.
Interceptive tx for a single tooth anterior crossbite.
1) Fixed option: 2 x 4
2) Removable option: Hawley bow with active Z spring
Describe the 2 x 4 method to correct a single tooth anterior crossbite.
Put buttons on two molars to open up the bite, then put brackets on 4 incisors to pull the crossbite anterior tooth out more.
Describe the removable method for correcting a single tooth anterior crossbite.
Hawley bow guides the arch form.
The active Z spring pushes the single crossbitten tooth out.
Posterior bite plate opens the bite so the tooth has room to come forward.
This type of posterior crossbite represents bilateral constriction of the maxilla with functional shift of the mandible to get intercuspation.
Unilateral
Treatment for posterior crossbite in the MIXED dentition.
Hyrex RPE
Quad Helix
Schwartz plate (removable appliance)
This happens if you throw the pacifier out too early.
Thumb-sucking.
You want the thumb-sucking habit to end by this age.
3
Critical time to correct the non-nutritive sucking habit is…
When the permanent incisors come in.
Potential problems with non-nutritive sucking habits.
- Anterior open bite
- Flared incisors
- Posterior maxillary constriction
- High arched palate
- Asymmetry
- Tongue thurst habit on swallowing to create a seal.
Prevents thumb sucking.
- Mavala
- Thumb guard
- Appliance
When a permanent tooth resorbs the wrong baby tooth, or it resorbs an adult tooth.
Ectopic eruption
Ectopic eruption of the maxillary first molar causes resorption of which tooth?
Primary second molar
Ectopic eruption of the maxillary first molar self-corrects what percent of the time?
66
Treatment options for ectopic eruption of the maxillary first molar.
- Ortho separator
- Brass wire separator
- Extraction of the primary second molar with space maintenance.
- Severe cases will cause loss of the primary second molar.
A band is placed on the second primary molar, and a button is placed on the ectopic adult first molar so that it can be distalized away from the baby second molar.
Halterman appliance
Appliance that distalizes the adult maxillary first molar.
Halterman appliance
An appliance that distalizes and derotates the maxillary first molar.
Shammy appliance
Can cause ectopic eruption of the primary canine.
Lateral incisor
An ectopic canine can cause resorption of which tooth?
Lateral incisor
What fraction of the time are maxillary canines PALATALLY impacted?
2/3
