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PRD 131 > winter quiz; root morphology > Flashcards

winter quiz; root morphology Flashcards

1
Q

whats root top

A

apical foramen

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2
Q

whats pulp developed from

A

mesoderm

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3
Q

what is the orifice of the pulp chamber

A

right before the canal starts

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4
Q

how many pulp horns does maxillary ; central, lateral iincisors have

A

central; 3 pulp horns

lateral; 3 pulp horns or 1 peg lateral

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5
Q

how many pulp horns does maxillary canine, first premolar, second premolar have

A

canine; 1 pulp horn
1st premolar; 2 pulp horns
2nd premolar; 2 pulp horns

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6
Q

how many pulp horns does maxillary first molar, second molar have

A

maxillary first molar; 4 pulp horns (4 or 5 cusps)

maxillary 2nd molar; 3 or 4 pulp horns (3 or 4 cusps)

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7
Q

how many pulp horns does mandibular central, lateral incisors, canine have?

A

central; 3 pulp horns
lateral; 3 pulp horns
canine; 1 pulp horn

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8
Q

how many pulp horns does mandibular first, second premolars have

A

first; 1 or 2 pulp horns

second; 2-3 pulp horns

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9
Q

how many pulp horns does first/second mandibular molars have

A

first; 5 pulp horns

second ; 4 pulp horns

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10
Q

what are the FOUR types of root canals

A

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

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11
Q

what does root attachment depend on

A
  • 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)

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12
Q

what are maxillary central incisors root shape, mesial vs distal size? pulp horns?

A
  • 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!

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13
Q

whats maxillary lateral incisors root and chamber outline?
cnaal, pulp horns?

mesial/lingual shape

A

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

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14
Q

whats maxillary canine cervical outline shape? root, canal, pulp horn? root depressions?

average crown/root length

A

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

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15
Q

whats maxillary first premolar root furcation type? roots, canals, pulp horns? root depressions?

A
  • 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
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16
Q

maxillary second premolar; whats the cervical outline of the root, which direction is it widest? how many roots/canals? pulp horns? root depressions?

A
  • 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
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17
Q

maxillary first and second molars; whats the furcation type and difference between them

A

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

18
Q

for maxillary first and second molars whats the ratio of three root sizes

A

palatal> MB > DB

MB is wider than distal buccal

19
Q

how many canals do first and second molars have

A

four canals, MB may have 2 canals (90% of time) (one is often missed!)

20
Q

what depressions are on maxillary molasr

A

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
21
Q

whats the average crown/root length of. maxillary central, lateral incisors and canine?

A

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)

22
Q

whats the average crown/root length of. maxillary first, second premolars

A

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

23
Q

whats the average crown/root length of. first and second maxillary molars

A

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

24
Q

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?

A

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

25
Q

mandibular canine; cervical outline, root/canal, average crown/root and total length? depressions?

A

cervical outline is wider faciolingually, 70% have one root and one canal!

  • crown= 11mm, root= 15.9 mm, total = 25.9 mm
  • variation of normal is two roots, two canals. one facial, one lingual!
  • root depression mesial and distal but DISTAL is deeper!
26
Q

mandibular first premolar; cervical outline, root, canal, pulp horn? crown , root and overall lenth? depressions?

A
  • cervical outline is ovoid, wider buccal lingual.
  • one root, one canal in 70%
  • may have one or two pulp horns
  • root depressions ; mesial 50% of time, and has distal distal is deeper!

crown=8.8mm. root =14.4 mm, overall=22.4 mm

27
Q

mandibular second premolar; cervical outline, root, canal, pulp horn? crown , root and overall lenth? depressions?

A

one root, one canal 96% of the time.

  • 2 to 3 cusps and may have 2 or 3 pulp horns
  • root depressions are not common on mesial, but are frequent on the distal

crown=8.2 mm, root=14.7mm, overall =22.1mm

28
Q

mandibular first and second molars; what are the furcations, which root is wider which way, how many canals

A

bifurcations, has mesial and distal roots

  • mesial is wider facially lingually and slightly longer
  • three canals
  • has a distal canal and then two mesial canals (MB, ML)

first crown=7.7mm, root length (14 M, 13 D) overall =20.9
second crown=7.7, root (13.9 M, 13D), overall =20.9 mm

29
Q

how do mandibular first and second molar root shapes compare

A

root trunk is shorter and roots are more spread out on the first molars than the second molars and thirds.
mesial root has mesial and distal root depressions

30
Q

where are anomalies more common in the mouth

A

-more commonly in maxilla than mandible, and in permanent dentition than in primary dentition

except for third molars and the maxillary, lateral tooth is the one with most anomalies!!

31
Q

what is flexion

A

deviation or bending of roots, which is observed in absence of trauma

32
Q

whats dilaceration

A

due to trauma during or delay of eruption

-curve or bend anywhere along length of tooth.

33
Q

what is concrescence, which teeth does it usually occur with

A

cementum overlying roots join together. usually involves just two teeth. most common upper second and third molars

34
Q

what is hypercementosis

A

excessive buildup of cementum on roots. thicker layer can give tooth an enlarged appearance. common at the apex or apices of tooth

35
Q

what is agenesis

A

when tooth buds do not form.

example; maxillary laterals are sometimes missing congenitally

36
Q

whats most common lateral anomaly

A

peg lateral. lacks contact on mesial or distal

37
Q

what are hutchinsons incisors

A

notches on incisal. when infected mother passes syphilis to her unborn, the childs teeth in both dentitions may develop with unusual shapes.

38
Q

whats fusion/gemination

A

fusion; two adjacent crowns fuse, appear twice the size but separate roots
gemination; two crowns form from a single tooth.

39
Q

what is dens in dente

A

tooth within a tooth

40
Q

whats talons cusp

A

extra cusp, small projection in cingulum, area of maxillary or mandibular teeth

41
Q

whats ankylosis

A

fusion of teeth to bone. loss of PDL space, x ray diagnosis. uncommon in adults!
found more in primary dentition. primary second molar fuses to bone and retained, only partial root resoprtion. tooth is not exfoliating?

PRD 131 (25 decks)

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