Forensics, Comparative Anatomy, Geometrics, Form, Function Flashcards Preview

Dental Anatomy > Forensics, Comparative Anatomy, Geometrics, Form, Function > Flashcards

Flashcards in Forensics, Comparative Anatomy, Geometrics, Form, Function Deck (34):
1

what is a haplodont?

single cone

2

what is a tricodont?

  • 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

3

what is a quadritubercular?

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

4

what are the 4 stages of tooth evolution?

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

5

T or F:

all teeth show traces of 4 lobes

true

anterior with 3 labial and 1 lingual

6

describe bunodont and isognathous

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

7

what is anisognathous?

unequal jawed

8

T or F:

humans are perfectly isognatthous

false:

they are not perfectly isognatthous due to maxillary arch overlapping mandibular

9

what 3 general geometrical figures to teeth show?

  • triangle
  • trapezoid
  • rhomboid

10

facial and lingual aspects of all teeth are ____ in shape

trapezoidal

11

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

  • shortest
  • widest

12

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

  • mandibular central incisors
  • maxillary third molars

13

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

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

14

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

labiolingual

15

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

  • trapezoidal
  • longest side at base of crown

16

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

occlusal

17

mesial and distal aspects of mandibular posteriors show what shape?

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

18

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

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

19

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

buccal and lingual

20

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

false

it should be avoided 

21

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

interproximal spaces

22

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

gingival papilla

23

the ____ line is a stable anatomical demarcation

cervical

24

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

gingival

25

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

gingival line

26

what is dehiscence?

a cleft or partial absence of bone over root

27

_____ is a window in the bone over a root

fenestration

28

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

cervicoenamel ridge

29

roots ____ for stabilization

flare

30

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

less

31

T or F:

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

true

32

incisal ridge or cusp is centered over the ____

root

33

what is the curve of spee?

curvature of the occlusal plane from anterior to posterior

34

what is the curve of wilson?

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