Forensics, Comparative Anatomy, Geometrics, Form, Function Flashcards
what is a haplodont?
single cone
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
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
what are the 4 stages of tooth evolution?
- reptilian stage (haplodont)
- early mammalian stage (triconodont)
- triangular stage (tritubercular molar)
- quadritubercular molar
T or F:
all teeth show traces of 4 lobes
true
anterior with 3 labial and 1 lingual
describe bunodont and isognathous
- tooth bearing cusps; equal jawed
- up and down movements is typically bunodont
what is anisognathous?
unequal jawed
T or F:
humans are perfectly isognatthous
false:
they are not perfectly isognatthous due to maxillary arch overlapping mandibular
what 3 general geometrical figures to teeth show?
- triangle
- trapezoid
- rhomboid
facial and lingual aspects of all teeth are ____ in shape
trapezoidal
facial and lingual aspects of all teeth are _____ at the base of the crown and _____ at working surfaces or occlusal line
- shortest
- widest
each tooth has 2 antagonists in opposing arch, except which teeth?
- mandibular central incisors
- maxillary third molars
from mesial and distal aspects of anterior teeth, what is the general shape?
- triangular
- base at cervical portion, apex at incisal ridge
anterior teeth taper ______ to a thin ridge to allow for food penetration
labiolingual
from mesial and distal aspect, what shape are maxillary posteriors?
- trapezoidal
- longest side at base of crown
____ surface of maxillary posteriors is constricted so that the tooth can be forced into the food more easily
occlusal
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)
restorations should always be directed in the ____ ____ of the tooth. otherwise…?
- long axis
- otherwise there will be negative feedback from receptors in the periodontium
___ and ____ contours have influence in the way food is directed away from gingival tissues
buccal and lingual
T or F:
over and under contouring of restorations is ideal
false
it should be avoided
proximal contacts of approximating teeth in the arch protect the soft tissue (gingiva) between the teeth and are referred to as ____ ____.
interproximal spaces
gingiva within the interproximal space is called the ____ ____, or interdental papilla
gingival papilla
the ____ line is a stable anatomical demarcation
cervical
the ____ line represents the gingival level on the tooth at any one period in an individual’s life
gingival
misalignment of the teeth may change the _____, which is not conducive to the health of the tissue
gingival line
what is dehiscence?
a cleft or partial absence of bone over root
_____ is a window in the bone over a root
fenestration
curvature of the crown above the cervical line is the ______ ____
cervicoenamel ridge
roots ____ for stabilization
flare
cusp tip to cusp tip buccolingually is much ____ than the buccolingual diameter of the root base
less
T or F:
overall form of the rooth depends on the work the tooth has to do
true
incisal ridge or cusp is centered over the ____
root
what is the curve of spee?
curvature of the occlusal plane from anterior to posterior
what is the curve of wilson?
- curvature from left to right
- lingual inclination of the mandibular molars
