Periodontium Flashcards
tissues that support the position of the tooth within the jaw
periodontium
cementum is a ___________ tissue
mineralized
the PDL is a ______ tissue
connective
the alveolar process is a ________________ tissue
mineralized
what is the composition of the alveolar process
60% hydroxyapatite and 25% type I collagen
what types of bone are found in the alveolar bone
cortical/dense and trabecular/cancellous
what does the alveoli house
the roots of the teeth
lines each alveolus
alveolar bone proper
makes up the rest of the alveolar process
supporting alveolar bone
the supporting alveolar bone is composed of plates of __________ bone on the buccal and lingual surfaces and ___________ in between
cortical
trabecular
what is alveolar bone proper composed of
cortical bone
what is the alveolar bone proper seen as on radiographs
lamina dura
the alveolar bone proper contains ________________ from the PDL
sharpey’s fibers
covers and protects the root dentin
cementum
cementum provides attachment for the _________
PDL
cementum participates in maintenance of what
occlusion
what is the composition of cementum
65% hydroxyapatite and 23% type I collagen
development of cementum
cementogenesis
what forms cementum
cementoblasts from ectomesenchymal cells in the inner portion of the dental follicle/sac
what type of cementum is deposited first
acellular (primary)
what part of the tooth does acellular primary cementum cover
root dentin
does acellular primary cementum contain cementocytes
no
where is cellular (secondary) cementum located
covering acellular cementum, typically in the apical 1/3
does cellular secondary cementum contain cementocytes
yes in the lucunae
what is type I collagen divided into
intrinsic fibers and extrinsic fibers
what lays down intrinsic fibers of type I collagen
cementoblasts
what type of fibers are sharpey’s fibers
extrinsic fibers
is cementum vascular or avascular
avascular
cementum is more resistant to what
resorption
cementum and bone contain cells in lucunae with _________________ and __________________
canaliculi and type I collagen
specialized connective tissue with groups of fibers
PDL
the PDL attaches teeth to what
alveolar bone proper
what does the PDL house
nerves and sources of blood supply
where does the PDL form from
ectomesenchyme of dental follicle/sac
main fiber group of the PDL with 5 subgroups
alveolodental ligament
what are the 5 subgroups of the alveolodental ligament
alveolar crest, horizontal, oblique, apical, and interradicular
connects teeth to each other
interdental ligament
what is included in the gingival fiber group
dentogingival, dentoperiosteal, circular, and alveologingival
gingiva to alveolar crest
alveologingival
gingiva to cementum
dentogingival
cementum to periosteum
dentoperiosteal
surrounds tooth
circular
