Flashcards in NBDE ANATOMICAL SCIENCES: Periodontium Deck (75):
surrounding the gingival portion of the root of each tooth is a specialized epithelium known as the
the dentogingival epithelium is the junction bw the
tooth surface and the gingival tissues
the sulcular epithelium and junctional epithelium form the _ made of ___ epithelia
dentogingival junctional tissues
non-keratinized stratified squamous epithelium
___ epithelium aka crevicular epithelium stands away from the tooth, creating a gingival sulcus or space that is filled with gingival fluid
__ epithelium is a deeper extension of the sulcular epithelium. It begins at the BASE of the sulcus
the junctional epithelium is 15-30 cell layers thick at the _ end and only a few cells thick at the ___
at beginning it is 15-30 cell layers thick
at end only a few cells thick
the junctional epithelium consists of 2 layers a _ and _
basal layer and suprabasal layer
which layer of the junctional epithelium provides the hemidesmosomes
superficial aka suprabasal epithelial cells
the internal basal lamina/outer basal lamina provide the epithelial attachment of the junctional epithelium
internal basal lamina
in ideal gingival health, the JE is located entirely in _, above the __ (CEJ/DEJ)
enamel, above the CEJ
what is the difference histologically bw the free gingiva and the epithelial attachment (JE)?
the free gingiva contains rete pegs and CT papillae but JE (epithelial attachment) does not
__ are epithelial projections that extend into the gingival CT
___ are CT progejections that extend into the overlying epithelium
connective tissue papillae
which gingival fibers extend bw the cementum and approximating teeth?
the mucosa on the hard palate is known as
oral mucosa is composed of what two layers
stratified squamous epithelium (which can be parakeratinized/non keratinized/orthokeratinized depending on location) and LAMINA PROPIA = CT supporting epithelium. can be attached to periosteum of bone or interposed over the submucosa
the submucosa contains the
the soft palate is _ mucosa
the free, interdental and attached gingiva are _ mucosa
the dorsal tongue surface is both _ and __ mucosa
specialized and masticatory
the buccal mucosa, labial mucosa, alveolar mucosa, floor of mouth, ventral tongue surface and soft palate are __ mucosa
the free gingiva, attached gingiva, interdental gingiva, hard palate, dorsal surface of tongue are _ mucosa
the lining mucosa are/not keratinized
not! thin lamina propria with few rete pegs
the masticatory mucosa are/not keratinized
are! thick lamina propria with many rete pegs
the __mucosa of the dorsal tongue is associated with lingual papillae.
Lingual papillae are
the small nipple or hair–like structures on the upper surface of the tongue that give the tongue its characteristic rough texture.
There are four types of lingual papillae on the human tongue: circumvallate papillae (vallate papillae), fungiform papillae, filiform papillae and foliate papillae. All except the ___papillae are associated with taste buds
the specialized mucosa is __ keratinized
which lingual papillae are keratinized?
circumvallate and the filiform (to remember, both are the only ones that the 2nd letters are I)
which lingual papillae are NOT keratinized?
fungiform and foliate
the crevicular (sulcular) epithelium and the gingival COL are __keratinized?
the gingival _ is the interdental depression in the gingiva bw the buccal and lingual papillae
the lining of healthy sulcus is composed of __keratinized epithelial tissues with _ rete pegs
nonkeratinized, no rete pegs
the presence of rete pegs in the sulcus indicates
the junction of the lining mucosa and masticatory mucosa Is called the
the BM is located bw
oral epithelium and CT.
the BM is composed of two layers =
scaling and root planning can remove calculus and stimulate the gingiva. usually periodontics waits 4-6wks after procedure to reevaluate therapy. this allows healing of the CT by what cellular component of the gingival CT?
fibroblast = responsible for synthesis and secretion of collagen and proteins. therefore they are responsible for healing of the gingiva following surgery or disease processes
the gingival apparatus is the
gingival ligaments and epithelial attachment
which is not a derivative of the dental follicle:
the dental follicle is aka
the dental sac!
the dental follicle (Dental sac) is responsible for the development of the
supporting structures of the tooth = including the cementum, PDL and alveolar bone
the pulp is a derivation of the
dental papilla (P for pulp)
the __ appears as the periodontal space on radiographs (0.2mm width)
PDL = a radiolucent area bw the radiopaque lamina dura of the alveolar bone proper and the radiopaque cementum
the PDL is _ CT
PDL transmits occlusal forces from teeth to bone allowing for a small amount of __ and acting as a shock absorber for the soft tissue around the teeth such as BV and nerves
when a tooth loses its function (hypofunction) what happens to the PDL
becomes very thin and loses regular attachment
PDL also becomes very thin and loses regular attachment in areas of tension/compression?
teeth in hyperfunction have a _ PDL width
does the PDL show changes related to aging?
no, unlike other CT tissues of periodontium the PDL does not
the PDL can undergo drastic changes as a result of
epithelial rests of Malassez
are remnants of Hertwig's epithelial root sheath found in the PDL of a functional tooth.
epithelial rests of Malassez are remnants of Hertwig's epithelial root sheath found in the PDL of a functional tooth that may become mineralized and form __
Periapical and radicular cysts derive their cyst linings from the
rest of Malassez
which periodontal ligament fiber mainly resist movements of a tooth in an occlusal direction
apical group aka periapical = resists extrusive forces that try to pull the tooth out (in an occlusal direction) and rotational forces
PDL is made of type _ collagen
type 1 just like dentin
the main principal fiber group of the PDL is the
alveolodental ligament (consists of 5 groups)
function of this group is to resist tilting forces, which work to force the tip either mesially, distally, lingually or facially
horizontal group (from alveolar bone above crest to cementum horizontally)
the function of this group is to resist intrusive forces that try to push tooth inward and also rotational forces
oblique = cover the apical 2/3 of the root from bone to more apically located cementum
the function of this group is to work with alveolar crest and apical groups to resist intrusive, extrusive tilting and rotational forces
interradicular group = from cementum into bone in bifurcation of root
the _ group function is to resist tilting, intrusive extrusive and rotational forces originates at alveolar crest and fans out to insert into CERVICAL cementum at various angles
alveolar crest group
which fibers go from cementum to cementum without attaching to bone
transseptal aka interdental ligaments. = function resist rotational forces and keep teeth in contact
note all the PDL fibers resist
the ends of the principal fibers which are embedded into the cementum AND alveolar bone are called
what is the most common cell found in the PDL
IN ALL CT THE _ ARE THE MOST COMMON CELL
Contents of PDL
cementoblasts and cementoclasts
osteoblasts and osteoclasts
macrophages mast cells eosinophils
undifferentiated mesenchymal cells
ground substance (proteoglycans, GAGs, glycoproteins and water)
functions of PDL
support, formative, nutritive, sensory, remodeling
sensory function of PDL?
contains afferent nerves = pain pressure porprioception
remodeling function of PDL?
contains cells responsible for remodeling of PDL
orthodontic treatment is possible bc the pDL
continuously responds to changes as the result of functional requirements imposed upon the PDL by externally applied forces
is the PDL vascular?
yes from maxillary artery
the PDL lymphatics drian to the _ lymph nodes except for the mandibular inscisors that drain into the
submental lymph nodes
what are the two types of nerves found in the PDL
afferent (sensory) = myelinated and transmits sensation.
autonomic sympathetic = regulates the BV's