D.A. Facts Exam I

bujucozo's version from 2016-05-26 19:06

Section 1

Question Answer
An oblique ridge is formed from two triangular ridges of what two cusps?distobuccal-mesiolingual; oblique ridges found on maxillary molars only
Difference between developmental (primary) grooves and others?developmental denotes the coalescence of primary lobes
Exception to the rule that all posterior teeth have inciso-gingival contact points in the M third?mesial surface of molars: contacts in the junction of O & M
All teeth have facial HoC in the cervical third exceptmandibular molars which have it at jnx of C & M thirds (surprise!)
What are the mandibular canine's I-G contact pointsM: I third; D: M third
Lingual HoC: Ant. teeth C third.; Post. in M third, exceptMand 2nd P: O third, look at it!
Lingual embrasures wider than facial everywhere exceptMax 1 M (mand centrals equal)

Section 2

Question Answer
Primary incisors erupt6 mo.
Primary 1 M's1 yr
Primary mand. canines (followed by max?)1.5 yr
Primary 2 M's2 yr
Order of eruption of primary dentitionI, 1M, C, 2M

Section 3

Question Answer
Usu perm tooth in which arch first to eruptMand
1 M erupt6 yr
Mand CI6-7 yr
Mand L7-8 yr
Max CI7-8 yr
Max L8-9 yr
Mand C9-10 yr
(1,2) P10-12 yr
Max C11-12 yr - Last succedaneous!
2M12 yr
3M17-21 yr

Section 4

Question Answer
3 teeth with tallest crownsMand C, Max CI, Max C
Only tooth with pulp wider M-DMax CI
Largest cusp of molarsM supporting cusp
Number mamelons on incisors3, middle smallest
First succedaneous toothMand CI 6-7 yr
Mandibular centrals bifurcate40% (2 canals, usu still 1 root)
Facial HoC <est, >estMand centrals, posteriors

Section 5

Question Answer
3 teeth most likely malformed or missing3M, Max L, Mand 2P
Might have a groove running onto distal side of root from lingual pitMax L
Incisal edge lingual to long axis of the toothMand CI
Longest rootMax C, longest tooth overall too!
Longest teethMax C, Mand C, Max CI
Second longest rootMand C
Only root inclined mesiallyMand C

Section 6

Question Answer
Hexagonal from occlusalMax 1P, Max 2P too (but 2P rounder)
Root situation of Max P's?Max 1P 2 roots (aka it bifurcates 100% time); Max 2P 1 root, 50% 2 canals!
Longer mesial cusp slopeMax 1P (think: making that giant embrasure w/Max C)
MMR grossly different angle than DMRMand 1P
Odds P bifurcate?Max 1P 100% (from 1 root) aka has 2 (very rarely 3); 60% Max 2P (within one root); Mand 1P 30% (from/in 1 root); Mand 2P ALMOST NEVER
P most likely to have 1 root and 1 canal?Mand 2P

Section 7

Question Answer
Which lingual cusp larger of Mand 2P 3 cusp type?ML (ML side is more premolary, D of DL flatening out into a molar)
Dramatic pulp chamber constriction?Max 1P
Only root with both a facial and lingual concavitypalatal root of Max 1M (which also happens to have a facial and lingual groove on the crown, btw, imp.)
Rank cusp size of Max 1M (what changes in 2M, 3M)?ML > MB > DL > DB (in 2M, 3M the DL becomes smallest, finally!!)
Only tooth with a mesio-lingual grooveMand 1P
Only two teeth with crown concavitiesMax 1P on mesial; Max 1M on distal
Only tooth roots inclined mesiallyMand C

Section 8

Question Answer
Premolar most likely to have 1 root and 1 canal (least likely to bifurcate)mand 2P
# root canals in Mand 1M3 canals! (2 in mesial root 90% time - similarly for 2M it's 60%) BUT ONLY 2 ROOTS
Groove over mesial marginal ridgeMax 1P (of course! mesial marginal developmental groove)