Morphology of Permanent Incisors Flashcards

Question

Variations in Maxillary Incisors

Answer 1

Shovel Shaped | and Double Shovel Shaped

Answer 2

Possible on Maxillary Incisors | -smoke, drink coffee, easily stained

Answer 3

Roots taper narrower | toward the lingual

Answer 4

``` -Incisal edge labial or at midroot axis line -Maxillary centrals (from distal view) may have distoincisal edge is lingual to the axis due to distolingual twist of incisal edge (shows better on incisal view) ```

Answer 5

``` -As on all anterior teeth, the mesial CEJ curves more than the distal ( seen clearly here on a canine lingual view) - Largest CEJ curve for all teeth is mesial of maxillary central incisor (up to3.5 mm) ```

Answer 6

``` Both maxillary central and lateral incisors have the heights of contour (facial and lingual) in the cervical third ```

Answer 7

*known for no depression on root surface; if slight depression, will be on MESIAL ``` -Maxillary central root has a flatter lingual outline in the cervical third, then tapers - Laterals have more overall uniform taper -No root depression on distal, rare shallow depression on mesial ```

Answer 8

``` -Both maxillary incisors have mesiodistal greater than the faciolingual, but more so for the maxillary centrals -Laterals are closer to equal for FL and MD ```

Answer 9

``` -Maxillary central has a triangular crown outline (because the facial surface is flatter) -Maxillary lateral has a more round or oval outline ```

Answer 10

``` -Maxillary central exhibits a distolingual twist of the incisal edge; the lateral does not -Maxillary central has cingulum distal to root midroot axis line ```

Answer 11

Maxillary lateral has more labial curvature (is more convex) than the central incisor

Answer 12

-Mandibular central is symmetrical, don't need to determine R vs L -Mandibular lateral is larger than central -3 mamelons (before wear) on mandibular incisors

Answer 13

``` -Mandibular central has mesioincisal angle = distoincisal angle -Lateral has distoincisal angle more rounded than mesioincisal angle ```

Answer 14

``` -Mandibular central has mesial and distal contact at SAME level (incisal third close to incisal edge) • Mandibular lateral has mesial contact more incisal than distal (incisal third, more cervically than central) • All contacts in incisal third ```

Answer 15

``` Mandibular incisor roots appear to be longer relative to the crown than maxillary incisor roots ``` 1.45 root crown ratio

Answer 16

``` -Distal bend of root tip is more common than mesial bend -Roots are narrow mesiodistally ```

Answer 17

-All mandibular incisors have | minimal marginal ridges and fossa depth (compared to maxillary incisors)

Answer 18

``` Mandibular lateral cingulum is more distal to the midroot axis than on centrals (best seen incisally) ```

Answer 19

Both mandibular incisors roots are narrower from lingual and have mesial and distal root depressions (better appreciated comparing mesial and distal views)

Answer 20

``` Mandibular lateral incisor (mesial view) has the distolingual corner of the incisal edge showing lingually due to the distolingual TWIST; centrals do not ```

Answer 21

CEJ curves toward incisal more on the MESIAL than distal

Answer 22

``` -Buccal and lingual contours for both centrals and laterals are in the cervical third -All mandibular incisors have smooth lingual surfaces with shallow fossae ```

Answer 23

``` -Mandibular roots are much wider faciolingually than mesiodistally, especially compared to maxillary incisors -Both mandibular incisors have mesial and distal root depressions (distal is deeper) -Both mandibular incisors cross sections of root are “Kidney” or “Bow” shaped ```

Answer 24

ALL mandibular incisors have the faciolingual dimension greater than the mesiodistal

Answer 25

Mandibular central incisors are symmetrical; laterals are no

Answer 26

Lateral incisor has an incisal edge with a distolingual TWIST; central does not

Answer 27

Mandibular lateral incisor has a cingulum distal to midroot axis; central does not

Answer 28

All have convex facial contour and lingual contour decidedly convex (more curved)

Morphology of Permanent Incisors Flashcards

(52 cards)