Forensics, Comparative Anatomy, Geometrics, Form, Function

Question 1

what is a haplodont?

Answer 1

single cone

Question 2

what is a tricodont?

Answer 2

• exhibits three cusps in line in the posterior teeth
• largest cusp in the center
• not seen now except a few breeds of dogs and other carnivores

Question 3

what is a quadritubercular?

Answer 3

• four cusps in a quadrangle
• humans, chimps, gorilla, etc.
• anterior teeth used for incising and holding
• posterior teeth used for grinding and shearing

Question 4

what are the 4 stages of tooth evolution?

Answer 4

• reptilian stage (haplodont)
• early mammalian stage (triconodont)
• triangular stage (tritubercular molar)
• quadritubercular molar

Question 5

T or F:

all teeth show traces of 4 lobes

Answer 5

true

anterior with 3 labial and 1 lingual

Question 6

describe bunodont and isognathous

Answer 6

• tooth bearing cusps; equal jawed
• up and down movements is typically bunodont

Question 7

what is anisognathous?

Answer 7

unequal jawed

Question 8

T or F:

humans are perfectly isognatthous

Answer 8

false:

they are not perfectly isognatthous due to maxillary arch overlapping mandibular

Question 9

what 3 general geometrical figures to teeth show?

Answer 9

• triangle
• trapezoid
• rhomboid

Question 10

facial and lingual aspects of all teeth are ____ in shape

Answer 10

trapezoidal

Question 11

facial and lingual aspects of all teeth are _____ at the base of the crown and _____ at working surfaces or occlusal line

Answer 11

• shortest
• widest

Question 12

each tooth has 2 antagonists in opposing arch, except which teeth?

Answer 12

• mandibular central incisors
• maxillary third molars

Question 13

from mesial and distal aspects of anterior teeth, what is the general shape?

Answer 13

• triangular
• base at cervical portion, apex at incisal ridge

Question 14

anterior teeth taper ______ to a thin ridge to allow for food penetration

Answer 14

labiolingual

Question 15

from mesial and distal aspect, what shape are maxillary posteriors?

Answer 15

• trapezoidal
• longest side at base of crown

Question 16

____ surface of maxillary posteriors is constricted so that the tooth can be forced into the food more easily

Answer 16

occlusal

Question 17

mesial and distal aspects of mandibular posteriors show what shape?

Answer 17

• rhomboidal
• incline to the lingual, allowing the cusps to come into proper occlusion (not cusp to cusp)

Question 18

restorations should always be directed in the ____ ____ of the tooth. otherwise…?

Answer 18

• long axis
• otherwise there will be negative feedback from receptors in the periodontium

Question 19

___ and ____ contours have influence in the way food is directed away from gingival tissues

Answer 19

buccal and lingual

Question 20

T or F:
over and under contouring of restorations is ideal

Answer 20

false

it should be avoided

Question 21

proximal contacts of approximating teeth in the arch protect the soft tissue (gingiva) between the teeth and are referred to as ____ ____.

Answer 21

interproximal spaces

Question 22

gingiva within the interproximal space is called the ____ ____, or interdental papilla

Answer 22

gingival papilla

Question 23

the ____ line is a stable anatomical demarcation

Answer 23

cervical

Question 24

the ____ line represents the gingival level on the tooth at any one period in an individual’s life

Answer 24

gingival

Question 25

misalignment of the teeth may change the _____, which is not conducive to the health of the tissue

Answer 25

gingival line

Question 26

what is dehiscence?

Answer 26

a cleft or partial absence of bone over root

Question 27

_____ is a window in the bone over a root

Answer 27

fenestration

Question 28

curvature of the crown above the cervical line is the ______ ____

Answer 28

cervicoenamel ridge

Question 29

roots ____ for stabilization

Answer 29

flare

Question 30

cusp tip to cusp tip buccolingually is much ____ than the buccolingual diameter of the root base

Answer 30

less

Question 31

T or F:

overall form of the rooth depends on the work the tooth has to do

Answer 31

true

Question 32

incisal ridge or cusp is centered over the ____

Answer 32

root

Question 33

what is the curve of spee?

Answer 33

curvature of the occlusal plane from anterior to posterior

Question 34

what is the curve of wilson?

Answer 34

• curvature from left to right
• lingual inclination of the mandibular molars