2 Flashcards
What is a root trunk?
The section of root nearest the crown from which multiple roots emerge. Primary and single rooted teeth don’t have them.
What happened to PDL with age?
The width decreases
Where is local infiltration most effective?
In areas of thin bone - incisor area (especially if there’s perio)
Secondary Dentin
formed after root formation and throughout life
Primary Dentin
laid down during tooth formation, ends when root is complete
Tertiary Dentin
Laid in response to trauma (highly irregular)
Features of Mand. 1st Premolar
Root length shorter than 2nd premolar and muchness than lower canine
Single root
Wider BL
Midroot cross-section is ovoid
The free gingiva
extends from the attached gingiva to the gingival crest. It thickens is from the mucogingival junction to the free gingival groove.
Pulp chamber
the portion of pulp cavity in the anatomical crown
Pulp cavity
the entirety of the pulp
Max. 2nd molar root config.
1 canal per root, 3 roots
Mand. 1st molar root config.
2 root canals in m root. 1 in d (70%) the other 30% have 2 canals per root
Mand. 2nd molar root config.
2 canals in m, 1 in d
What tooth has the greatest FL width?
Max canine, also longest root
Features of Max. 2nd Premolar
Ovoid in cross sections Wider BL single root similar root length to Max 1st premolar often deflected D in apical portion
What happens to pulp with age?
Chamber shrinks
Collagen density increases
Which tooth has a rounded plural outline in both cervicl and mid root cross sections?
Max. lateral
Tell me about the long ciliary nerves
They are branches of nasociliary (V1)
Provide sensory to cornea and eye
Sympathetic stimulation induced pupil dilation
What are the branches of nasociliary nerve?
“Serious People Like Interesting Art” (And look down their noses)
Sensory root of ciliary ganglion Posterior ethmoidal nerve Long ciliary nerve Infratrochlear nerve Anterior ethmoidal nerve
Tell me about the lesser petrosal nerve
It’s a branch of CN IX
Parasympathetic to parotid
Synapses in otic ganglion
Post-ganglion fibers travel with auriculotemporal to parotid
what is the isthmus of fauces?
The area bordered by palatoglossus and palatopharyngeus.
What does genioglossus do?
protrudes the tongue
What does palatoglossus do?
elevates the posterior tongue
What does hyoglossus do?
depresses and retracts the tongue
