Lecture 4 Flashcards
What connects the two hemi-maxillas?
-Intermaxillary suture
When an individual is growing does the intermaxillary suture contain cartilage?
-Yes
What does the cartilage in the intermaxillary suture allow?
-The maxilla to be expanded
What does a maxillary expander typically correct?
-Crossbites and alleviates crowding
T/F at the end of the expansion process a space between both maxillary central incisors will often be seen
True
T/F Almost any expansion device will tend to separate the midpalatal suture in a child up to the age of 9 or 10
True
In adolesence what is needed to separate the intermaxillary suture?
-A heavy force from a rigid jackscrew device
The mandible in embryonic life develops in the same area as what?
-Meckel’s cartilage
The development of the mandible begins as condensation of mesenchyme where?
-Just lateral to Meckel’s cartilage
How does the mandible form?
-Intramembranous bone formation
When are the symphyseal cartilages in the mandible replaced by bone?
-During the first year of life
What are the three secondary cartilages that develop in the mandible?
- Condylar cartilage
- Coronoid cartilage
- Symphyseal cartilage
What mandibular secondary cartilage is the largest?
-Condylar cartilage
When does the condylar growth rate peak?
-Between 12-14 yrs old
When is the growth phase of the condylar cartilage typically complete by?
-Age 20
The mandible growth occurs by what processes?
-Endochondral proliferation at the condyle and by apposition and resorption of bone at the bony surfaces
The mandible is translated in space by what?
-growth of muscles and other adjacent soft tissues
T/F Space maintenance is appropriate only when adequate space is available
True
The most rapid losses in the A-P distance of the arch is usually due to what?
-Mesial tipping and rotation of the permanent first molar after removal of the primary second molar
What type of space is the band and loop space maintainer used for?
-To hold the space of one tooth
When is a distal shoe space maintainer indicated?
-When a primary second molar is lost before the eruption of the permanent first molar
When is a lingual arch space maintainer indicated?
-To maintain space for premolars after premature loss of primary mandibular molars when the permanent incisors have erupted
Can a lingual arch be used on the maxilla?
-Only if the patients overbit is not excessive
If the pts overbite is excessive what type of space maintainer is indicated for on maxillary teeth?
-nance arch or a transpalatal arch
What are three different types of removable retainers?
- Removable hawley
- Removable essix
- RPD
T/F If a permanent successor will erupt within 6 months (there is more than one half to two thirds of its root formed) a space maintainer is unnecessary
True
What is a bar that is typically connected to the mandibular first molars and is held away from the teeth to preserve arch length?
-Lip bumper
What is the best choice for a space maintainer if a patient loses a primary molar unilaterally in the maxillary arch?
-Band and loop space maintainer
If a patient loses primary molars bilaterally what type of space maintainer would be the best choice?
-Nance holding arch or bilateral band and loop space maintainer
