514-5 Ortho Flashcards
What are the three categories of tooth movement? (&Subcategories)
1.Pre-eruptive 2.Eruptive (intraosseus &extraosseus) 3. Post-eruptive
What are the two factors of pre eruptive tooth movement?
- Total (bodily) movement of the tooth 2. Growth of one part of the tooth(like the root) while the rest remains fixed
Are preeruptive movements intra or extraosseus? What is the word used to describe the style of bone reabsorption c/o different shapes in teeth?
They are intraosseus (resorption happening medially and distally in the alveolus) ECCENTRIC growth.
What are governing areas that lead the pathway of eruption?
Gubernacular Canals!
What are the four theories of tooth eruption?
1.Root formation 2. Dental Follicle 3.Alveolar Bone Remodeling 4. PDL Formation
What is a hole in the Root Formation theory of tooth eruption?
That the alveolar bone yields to the root so the root is not “pushing out” of the alveolus. Tree root analogy!
What is the hole in the Dental Follicle tooth eruption theory?
That although the follicle has a large role in the formation of the Gubernatorial Canal, it DOES NOT have a effect on alveolar remodeling BELOW it, so the follicle is not stimulating the push outward.
What is the trouble with only going to the Alveolar Bone Remodeling theory of tooth eruption?
While giving CSF to a pre erupted tooth does stimulate osteoclasts necessary for eruption, they do not tell the whole story :( weak sauce. WHAT ABOUT bone deposition below the root? Post root formation?
What are the two main problems with the PDL theory?
Although the fibroblasts of the PDL can contract, there 1.have been teeth with PDLs that don’t erupt and 2. there have been teeth to erupt w/o PDL
What are the three reasons for POSTeruptive tooth movement?
1.Accomodation for Growth(keep up with jaw growth) 2.Compensation for continued occulsal wear(SAME mechs as eruptive tooth movement!! so not well known :( ) 3.Accomodation for inter proximal wear(Transsepital Fiber adjustment & take away interprox enamel!!)
What are the cells that remove DENTAL tissue?
ODONTOclasts
What do teeth do without the light pressure of the cheek?
The will tip buccally! The light constant pressure of the normal cheek keeps teeth in line!!
Will a deciduous tooth still shed if there is no successional tooth below it?
Yes! Growth of the face, jaws, and muscles all factor in too!
What are the three main steps of Orthodontic Movement?
1.Pressure applied triggers Hyalinization. Then once the cells of the hyalinized region are replaced the tooth can move. The MORE pressure the LONGER it will take to replace these cells! 2.Odontoblasts and Fibroblasts remodel the tension side of the pocket. 3.Cementum is very resilient, but pulp can be damaged with too quick of movement.
How long does it take to stimulate Cementum resorption?
30 days
