Anterior tooth anatomy

Question 1

READ OVER THE PPT AND DRAWING EXERCISES AGAIN BEFORE OSCE!

Answer 1

Do this ik youre reading this :)

Question 2

how far above the central incisor does the gingival zenith show?

Answer 2

1mm

Question 3

what are central incisors needed for?

Answer 3

Aesthetics, occlusion (function), phonetics/speech

Question 4

what is the midline of the central incisors vertical and parallel and perpendicular to?

Answer 4

incisal edge should be perpendicular to interpupillary line
parallel to middle of nose/septum

Question 5

what is the ratio for length to width of central incisors?

Answer 5

central incisor width should be 75-80% of its length, e.g., 10mm x 8 mm

Question 6

is the distal or mesial edge more rounded on incisors?

Answer 6

distal edge is more rounded than mesial edge

Question 7

what is an incisal embrasure?

Answer 7

a space existing on the incisal aspect of the inter-proximal contact area between adjacent anterior teeth

Question 8

how does incisal embrasure vary as you move distally?

Answer 8

increases in depth as you move distally

Question 9

difference between central and lateral incisors?

Answer 9

lateral incisors are smaller - usually 0.5-1mm shorter than central and canine

Question 10

how do teeth vary - what factors?

Answer 10

basic shape, length, axis, rotation, gingival zenith, display on smiling

Question 11

what happens to incisors as you age?

Answer 11

incisal wear - similar length
incisal embrasures decrease

Question 12

what is the gingival zenith?

Answer 12

the gingival zenith is the highest visible point on the gingival margin (highest part of the curve)
(laterals are 0.5-1mm below centrals and incisors)

Question 13

how big is the width of the lateral incisor in comparison to central?

Answer 13

lateral width is usually about 2/3 of the central

Question 14

what is the golden ratio?

Answer 14

1.618 (central) : 1 (lateral) : 0.618 (canine)
widths

Question 15

what is the most pleasing long axis of anterior teeth?

Answer 15

mesial axis inclinations are more pleasing than the distal

Question 16

what area of the mouth do the canines control?

Answer 16

canines control width, size and character of smile by the occluding part of the buccal corridor

Question 17

what are mamelons?

Answer 17

grooves on the incisal edge

Question 18

what are developmental grooves?

Answer 18

v-shaped grooves which run between lobes and align with the long axis

Question 19

compare the size of the developmental grooves in the centrals

Answer 19

mesial groove is longer than distal groove
accessory ridges may be present within v-shape groove

Question 20

compare size of developmental grooves in the laterals

Answer 20

mesial groove similar to central incisor
distal groove diminished

Question 21

compare size of developmental grooves in canines

Answer 21

mesial groove shorter than longer distal groove

Question 22

what is the emergence profile?

Answer 22

the contour of the tooth extending from the alveolus

Question 23

what are perikymata?

Answer 23

very small surface striations in young teeth

Question 24

what are imbrication lines?

Answer 24

subtle/broken/crescent-shaped ridges from cervical line to gingival bulge
parallel to CEJ
less apparent on laterals

Question 25

what happens to incisors with age?

Answer 25

increased enamel translucency and dentine opacity
intrinsic staining, cracks, craze lines

Question 26

palatal contour of incisors

Answer 26

concavity
marginal ridges
cingulum

Question 27

lower lateral and central sizes?

Answer 27

laterals are slightly sider than central

Question 28

width of uppers and lowers compared

Answer 28

lower incisors can be used to define upper incisor widths
width of upper central incisor = width of lower central + 0.5 width of lower lateral

Question 29

lower incisor lingual contour

Answer 29

lower incisors and canines have poorly developed cingula compared to upper anterior teeth

Question 30

what is the gap between 2 teeth called?

Answer 30

diastema (plural = diastemata)