Dental Anatomy Flash Cards

Question 1

Maxillary 1st Molar Facial ViewCoronal Taper

Answer 1

– The Mx 1st molars have the opposite crown taper of all other molars. • They are larger at the lingual M-D dimension than the facial M-D dimension.– Proximal surfaces can be viewed from the facial aspect on Mx 1st molars.– All maxillary molars have a much greater coronal taper to the cervical than the mandibular molars.

Question 2

Maxillary 1st Molar Facial ViewCusps

Answer 2

– Largest cusp is the ML cusp (visible from the facial).– Smallest cusp is DL cusp which is also visible.– MB and DB cusps are the about the same size.– Facial surface is narrower M-D than the lingual surface.

Question 3

Maxillary 1st Molar Palatal ViewCusps

Answer 3

– ML cusp is the largest cusp present. • Cusp of Carabelli may be present on the surface of the ML cusp – DL cusp is sizeable, but not as large as the ML.

Question 4

Maxillary 1st Molar Palatal ViewCrown dimensions

Answer 4

– Due to the larger ML cusp, the majority of the bulk of the tooth from this view is located in the mesial of the crown.– MB cusp and most of the DB cusp will not be visible from the lingual due to the large ML cusp on these molars.NOTE: No proximal surfaces are viewable fromthe lingual.

Question 5

Maxillary 1st Molar Palatal ViewGrooves

Answer 5

– The ML and DL cusp are separated by a L groove which may terminate in a lingual pit at its apex.

Question 6

Maxillary 1st Molar Proximal ViewCrown Dimensions

Answer 6

– Short occluso-gingivally and broad buccolingually.

Question 7

Maxillary 1st Molar Proximal ViewDistal View

Answer 7

– All of the cusps of the tooth are visible and also some of the buccal and lingual surfaces.– Due to slight distal tilt to the occlusal table.

Question 8

Maxillary 1st Molar Proximal ViewMesial View

Answer 8

Only the MB and ML cusps are visible and the higher MB marginal ridge prevents the viewing of the occlusal table.

Question 9

Maxillary 1st Molar Proximal ViewMarginal Ridge Grooves

Answer 9

– Can be present and radiate out from themarginal ridge fossae.– These are more common on the mesialmarginal ridge.

Question 10

Maxillary 1st Molar Proximal ViewTubercles

Answer 10

On unworn teeth can be associated withtubercles which are marginal ridgeprominences present between themarginal ridge grooves.

Question 11

Maxillary 2nd Molar Facial View Coronal Shape

Answer 11

– Very similar to the Mx 1st molars.– Short occluso-gingival dimension.– Broad M-D.– Slight slant of the occlusal table to the distal.

Question 12

Maxillary 2nd Molar Facial ViewCusps

Answer 12

– MB cusp is noticeably larger than the DB cusp.– ML cusp is still the largest and can be seen from the facial.– DL cusp is not usually visualized from the facial view.• DL cusp may not be present.• If it is present is much smallerthan all of the other cusps.

Question 13

Maxillary 2nd Molar Palatal ViewNumbers of Cusps

Answer 13

– About 1/3+ have a 3 cups configuration.– About 2/3 have a 4 cusp configuration.– This differs from Mx 1st molars which have a crown containing 4-5 cusps.

Question 14

Maxillary 2nd Molar Palatal ViewDL Cusp

Answer 14

– May not be present (3 cusp version).– If present (4 cusp version) the DL cusp is verysmall in comparison to the other cusps of themolar crown

Question 15

Maxillary 2nd Molar Palatal ViewML Cusp

Answer 15

–Similar to the Mx 1st molar, the ML cusp withMx 2nd molars is the largest cusp of the crown.– Due to the size difference of the cusps, moreof the bulk of the tooth from the palatal viewis located in the mesial portion of the crown.

Question 16

Maxillary 2nd Molar Palatal ViewCrown Taper

Answer 16

–Considerable occluso-gingival taper as there isin Mx 1st molars.

Question 17

Maxillary 2nd Molar Palatal ViewLingual Groove

Answer 17

– May or may not be present depending on thepresence of the DL cusp.

Question 18

Maxillary 2nd Molar Proximal ViewDimensions

Answer 18

Short occluso-gingivally and broaderfacio-lingually

Question 19

Maxillary 2nd Molar Proximal ViewCusp Heights

Answer 19

Cusp Heights– ML>MB>DB>DL (if present)

Question 20

Maxillary 2nd Molar Proximal ViewMesial View

Answer 20

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Question 21

Maxillary 2nd Molar Proximal ViewDistal View

Answer 21

–Due to the slight distal occlusal tabletilt, the occlusal surface is visible fromthe distal.– The DL cusp may or may not be present.– Distal marginal ridge is located cervicalto the mesial marginal ridge as Mx 1stmolar

Question 22

Maxillary 2nd Molar Proximal ViewMarginal ridge grooves

Answer 22

– May also be present on Mx 2nd molars,but are less common on these teeththan Mx 1st molars.

Question 23

Maxillary 2nd Molar Proximal ViewTubercles

Answer 23

– Can be seen on unworn Mx 2nd molars, but less common than Mx 1st molars.– Are more common on the mesial marginal ridges.

Question 24

Maxillary 2nd Molar RootsMorphology

Answer 24

– Similar morphology to the Mx 1st molar roots.– 3 roots present MB, DB, and P.

Question 25

Maxillary 2nd Molar RootsRoot trunk

Answer 25

– The root trunk on the Mx 2nd molars is larger than the 1st molars.

Question 26

Maxillary 2nd Molar RootsMB and DB roots

Answer 26

– These roots tend to be more parallel toeach other and are much less spreadout and more convergent to the apex.– The MB and DB roots are much closertogether with Mx 2nd molars than withMx 1st molars and are less divergenttowards the apex.

Question 27

Maxillary 2nd Molar RootsPalatal Root

Answer 27

– Relatively straight, conical and lackingin major curvature.– Extends beyond the external line of thecrown to the palatal.

Question 28

Maxillary 2nd Molar RootsRoot curvature

Answer 28

– There tends to be more of a distal bendto the roots of the Mx 2nd molar thanthe Mx 1st molar

Question 29

Maxillary 2nd Molar Occlusal ViewNumber of Cusps and Cusp Shape

Answer 29

– 3-4 cusps present:• MB, DB, ML, and DL cusps.• In some Mx 2nd molars the DL cusp is notpresent.– 4 cusp variants are rhomboid in shape.– 3 cusp variants are heart shaped.

Question 30

Maxillary 2nd Molar Occlusal ViewCrown Dimensions

Answer 30

– Mx 2nd molars are broader facio-linguallythan mesio-distally.– The difference between these dimensions ismuch more pronounced in the Mx 2nd molarthan the Mx 1st molar.

Question 31

Maxillary 2nd Molar Occlusal ViewML Cusp

Answer 31

– Largest of all the cusps.– Like with the Mx 1st premolar, the ML cusp isbound mesially by the mesial marginal ridgeand distally by the oblique ridge.

Question 32

Maxillary 2nd Molar Occlusal ViewBuccal Cusps

Answer 32

MB cusp of the Mx 2nd molars are noticeablylarger than the DB cusps (different than Mx 1st)

Question 33

Maxillary 2nd Molar Occlusal ViewDL Cusp

Answer 33

– May not be present.– If these cusps are present, they are muchsmaller than any of the other coronal cusps.

Question 34

Maxillary 2nd Molar Occlusal ViewOblique Ridge

Answer 34

– Present in Mx 2nd molar 4 cusp variants.– It is less prominent in Mx 2nd molar 4 cusp variantsthan in the Mx 1st molars.

Question 35

Maxillary 2nd Molar Occlusal ViewFossae and Grooves

Answer 35

– Mx 2nd molar 4 cusp variants share the same fossa and groove arrangement as the Mx 1st molars.– Mx 2nd molars 3 cusp variants have a mesial and distal pit and central groove only.• No disto-lingual groove and distal pit is present.