winter quiz; root morphology Flashcards
whats root top
apical foramen
whats pulp developed from
mesoderm
what is the orifice of the pulp chamber
right before the canal starts
how many pulp horns does maxillary ; central, lateral iincisors have
central; 3 pulp horns
lateral; 3 pulp horns or 1 peg lateral
how many pulp horns does maxillary canine, first premolar, second premolar have
canine; 1 pulp horn
1st premolar; 2 pulp horns
2nd premolar; 2 pulp horns
how many pulp horns does maxillary first molar, second molar have
maxillary first molar; 4 pulp horns (4 or 5 cusps)
maxillary 2nd molar; 3 or 4 pulp horns (3 or 4 cusps)
how many pulp horns does mandibular central, lateral incisors, canine have?
central; 3 pulp horns
lateral; 3 pulp horns
canine; 1 pulp horn
how many pulp horns does mandibular first, second premolars have
first; 1 or 2 pulp horns
second; 2-3 pulp horns
how many pulp horns does first/second mandibular molars have
first; 5 pulp horns
second ; 4 pulp horns
what are the FOUR types of root canals
I: one canal to extend from pulp chamber to apex
II: two separate canals leave pulp chamber but join short of apex to form one canal apically and one apical foramen
III: two separate canals from chamber continue to two separate apical foramina
IV: one canal from chamber but splits in apical third to two canals and two apical foramina
what does root attachment depend on
- root length
- number of roots
- cross sectional diameter of root from CEJ to apex
- root curvature
- presence of concavities or depressions
^ This all influence resistance of tooth to occlusal or other forces (lateral especially)
what are maxillary central incisors root shape, mesial vs distal size? pulp horns?
- triangular root and chamber outline
- mesial side is LONGER than the distal due to distal placement of cingulum!
- mesial root surface; flat or has slight longitudinal depression, but no prominent root grooves
- distal root surface; convex (no depression i think)
-one root, one canal (100% of the time) incisors have one pulp horn per facial lobe!
whats maxillary lateral incisors root and chamber outline?
cnaal, pulp horns?
mesial/lingual shape
egg or ovoid shaped
-1-3 pulp horns, but one root and one canal 100% of time
EXCEPTION= peg lateral incisal edge resembles cusp has one lobe and one pulp horn
-NO distal root depression, but has a mesial shallow longitudinal root depression
whats maxillary canine cervical outline shape? root, canal, pulp horn? root depressions?
average crown/root length
cervical outline shape is ovoid– wiiide facial/lingual
- one root, one cusp, one pulp horn 100% of time
- has root depresssions on mesial and distal, distal is DEEPER. provides better anchorage
LONGEST tooth average is 26.3 mm
avg crown; 10.6mm
avg root length; 16.5 mm
whats maxillary first premolar root furcation type? roots, canals, pulp horns? root depressions?
- apical half or third has bifurcation
- has two roots; one buccal and one lingual slightly shorter than the buccal one!
- two canals is most common. may have one root but may have two pulp canals ????
- two cusps, two pulp horns
root depressions;
- has mesial AND distal both in one and two rooted scenarios. mesial is DEEPER (this is unique)
- mesial depression continues with crown to root
maxillary second premolar; whats the cervical outline of the root, which direction is it widest? how many roots/canals? pulp horns? root depressions?
- outline is ovoid with buccal/lingual being widest
- usually has one root, one canal, two cusps and two pulp horns!
- root depressions on mesial and distal but DISTAL often is deeper
maxillary first and second molars; whats the furcation type and difference between them
both have trifurcation. MB, DB and palatal roots
-first molars have a shorter root trunk, more spread out roots than the second and third molars
for maxillary first and second molars whats the ratio of three root sizes
palatal> MB > DB
MB is wider than distal buccal
how many canals do first and second molars have
four canals, MB may have 2 canals (90% of time) (one is often missed!)
what depressions are on maxillary molasr
depression extend from trifurcation to cervical line on facial side
- lingual side- has slight lingual depression
- on mesial / distal it is variable! may have or not
whats the average crown/root length of. maxillary central, lateral incisors and canine?
central; crown= 11.2 mm, root length = 13 mm, overall length = 23.6 mm
lateral incisor; crown=9.8 mm, root length = 13.4 mm, overall length = 22.5 mm
canine; crown =10.6mm, root length =16.5 mm, overall length = 23.6 mm (LONGEST)
whats the average crown/root length of. maxillary first, second premolars
first; crown=8.6 mm, root=13.4 mm, overall = 21.5 mm
second, crown=7.7 mm, root length =14 mm, overall = 21.2 mm
whats the average crown/root length of. first and second maxillary molars
first; crown=7.5 mm, root lengths (12.9 MB, 12.2 DB, 13.7 L), overall length =20.1 mm
second; crown=7.6 mm, root lengths (12.9 MB, 12.1 DB, 13.5 L), overall length=20mm
for mandibular central and lateral incisors; what is the cervical outline shape - whats wider f/l or m/d.
-how many roots, canals, pulp horns, root depression?
cervical outline is ovoid and much wider facial/lingual (ribbon like)
- one root, one canal, 3 facial lobes and 3 pulp horns!
-laterals; less likely than centrals to have two canals
-root depression; mesial and distal in middle third of the root.
laterals have a distal depression that is more distinct
centrals ; crown=8.8mm, root=12.6mm, overall=20.8
laterals crown=9.4mm, root=13.5mm, total =22.1 mm
