Misc. Flashcards
when the mandible moves from CO to edge to edge it moves…?
forward and downward
where does the non-working condyle move?
downward, forward, and medial
during NON masticatory swallowing, where are the teeth?
IN CONTACT in intercuspal position
what exclusively determines intercuspal position?
tooth contact
centric relation is a ____ guided position and centric occlusion is a ____ guided posiition
- ligament
- tooth
in the envelope, what is the most superior point?
MI
the side shift of the mandible
bennett movement
when does bennett movement occur?
earliest stage of lateral movement
the bennett movement is the side shift of the mandible towards which condyle
the working condyle
another name for physiologic rest position?
postural position
what position is not located on the border of the envelope?
postural position/ physiologic rest position
what is postural position determined by?
the muscles
what fibers will you be using if you are to move from postural position to CO?
anterior fibers of the temporalis
what is the usual overjet?
2-4mm
horizontal overlap
overjet (think of a jet on the horizon)
vertical overlap
overbite
what is the main component of enamel?
inorganic matter (NOT collagen)
what is the direction of enamel rods in permanent teeth in the cervical third?
gingival direction
are a result of normal enemel apposition OUTSIDE tooth
perikymata
where are the striae of retzius?
inside the tooth
where does dentin form most rapidly for MULTIROOTED teeth
floor and roof of the pulp chamber
what percentage of dentin is organic
20-30%
what is the primary purpose of the pulp?
form dentin
what forms dentin?
dental papilla and the pulp
think DP dentin pulp
what type of dentin is mostly highly mineralized?
INTRA or peritubular dentin
where is the DEJ?
occurs at the junction of the dental papilla and the inner enamel epithelium
softest dental tissue?
cementum
where is the acellular cementum?
coronal 2/3
where is the cellular cementum?
apical 1/3
think that all of the cells are down where the blood supply is
when viewed from the occlusal arrangement, the teeth appear to be in a ____ shape
parabolic
when viewed from the occlusal, the 4 posterior teeth in the mandibular arch are aligned in a ______
straight line
most posterior teeth develope from how many lobes?
4 (equals the number of cusps)
what are the two exceptions of posterior teeth forming from not 4 lobes?
- permanent first molars (max AND mandib)
- mandibular second premolars (only three cusp type)
*all form from five lobes
do all teeth have distal and mesial marginal ridges?
yes
what separate cusp ridges from marginal ridges
developmental grooves
what does a transverse ridge result from?
the union of the facial and lingual triangular ridges
how many teeth in the permanenet dentition normally have cingula?
12 (6 upper and 6 lower)
*ALL anterior teeth
how much of the total facio-lingual dimension does the occlusal table make up of a POSTERIOR tooth?
55-65%
is the junctional epi in the periodontium?
yes
how wide is the PDL
0.2mm
how wide is the PDL in old age?
decreases to 0.1mm due to deposition of cementum and bone
PDL fibers attach what to what?
tooth to bone
gingival fibers attach what to what?
tooth to gingiva
what is the predominant connective tissue for PDL fibers?
TYPE ONE collagen
PDL fibers that provide the major support for a tooth during function
oblique fibers
which fibers reduce the likelihood of forceful impaction into the alveolus?
oblique fibers
which group of fibers are the most likely to be found in the middle 1/3 of the root?
oblique fibers
are transeptal fibers PDL fibers or gingival fibers?
gingival
fibers that extend from tooth to tooth
transeptal fibers
approximately how much of PERMANENT root formation is completed at the time the tooth erupts
50%
when is the apex of a tooth fully formed?
2-3 years after the tooth erupts in the mouth
all teeth have FACIAL heights of contour in the cervical third except for what teeth?
mandibular molars
anterior teeth have LINGUAL height of contour in the ____ third
cervical
most posterior teeth have heights of contour in the ____ third
middle
what is the exception to all posterior teeth having their heights of contour in the middle third?
mandibular second PM
*occlusal third
excess of calcified tissue (cementum) formation at the root apex
hypercementosis
where are supernumerary teeth found in the maxilla?
between centrals or as 4th molars
when cementum of two teeth join together
concrescence
developmental abnormality characterized by the presence of fewer teeth than usual
oligodontia
condition of missing all teeth
anodontia
