Overview of the Dentitions 2 Flashcards
tooth surfaces
facial- closest to the face, labial (anteriors), buccal (posteriors)
lingual- closest to the tongue, palatal (maxilla)
masticatory- incisal (anteriors), occlusal (posteriors)
mesial- closest to the midline
distal- farthest away from the midline
roots: common traits
-all teeth have one or more roots
-widest at CEJ and taper towards apex
-have more bulk on facial surface and taper more on lingual surface
-have indentations (root concavities)
importance of understanding root morphology
-effective instrumentation (probing, exploring, scaling)
-patient education and home care recommendations
root shape
related to:
form- crown type
function- tearing/cutting/grinding
placement in the arch- width of available jawbone
incisors root
slim, single roots
canines root
longest, strongest, one root
premolars
one or two roots, anatomy varies between 1st and 2nd
molars
multiple roots (three on max), (two on mand)
furcation
bone loss, result of periodontal disease, affects the base of the root trunk of a tooth where two or more roots meet (bifurcation or trifurcation)
relation of cementum to enamel at the cej
OMG rule
15% of teeth, cementum Overlaps enamel
52% of teeth, cementum just Meets the enamel
33% of teeth, a small Gap between cementum and enamel, exposed dentin
root concavities
linear developmental depressions
harmful: can cause greater attachment loss
protective: help to resist damage by occlusal forces
maxillary molars roots are called
mesiobuccal, distobuccal, palatal
mandibular molars roots are called
mesial and distal
naming rules
- mesial precedes distal
- mesial and distal precede all other terms
- labial, buccal, lingual follow mesial or distal
- incisal or occlusal follow labial, buccal, and lingual
crown thirds
anteriors:
vertical thirds
mesial, middle, distal
labial, middle, lingual
horizontal thirds
cervical, middle, incisal
posteriors:
vertical thirds
mesial, middle, distal
buccal, middle, lingual
horizontal thirds
cervical, middle, occlusal
