anatomical and physiological characters of the oral mucosa
TRANSCRIPT
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Anatomical and physiological
characters of the oral mucosa.
Oral mucosa diseases etiology
and classification.
Author: PhD Roman Ion
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INTRODUCTION
◼ The oral cavity is in many respects a very
interesting part of the human body .
◼ Many different kind of tissue from the
hardest teeth to the softest, the salivary
glands are found therein.
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Oral mucous membrane
◼ The moist lining of the oral cavity that is in
continuation with the exterior surface of
skin on one end and esophagus on the
other end is called the oral mucosa or
oral mucous membrane
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Function of oral mucousa
1. It is protective mechanically against both
compressive and shearing forces.
2. It provides a barrier to microorganisms ,
toxins and various antigens.
3. It has a role in immunological defence,
both humoral and cell- mediated.
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4. Minor glands within the oral mucosa
provide lubrication and buffering as well
as secretion of some antibodies.
5. The mucosa is richly innervated, providing
input for touch, proprioception, pain
and taste.
6. Reflexes such as gagging, retching and
salivating are initiated by receptors in the
oral mucosa.
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Function of oral mucosaTen Cate's Oral Mucosa, Nanci, Elsevier, 2013
◼Protection
◼Sensation
◼Secretion
◼Thermal regulation
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Main parts of oral mucosa
◼ The oral cavity consists of 2 parts:
outer vestibule (bounded by lips and
cheek) oral cavity proper (separated by
alveolus bearing teeth and gingiva).
◼ Superiorly: hard and soft palate
◼ Inferiorly: floor of mouth, base of
tongue
◼ Posteriorly: tonsils
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Classification of oral mucosa
Based upon primary function served
1. Masticatory Mucosa (25%)
2. Lining Mucosa (Covers 60% of total area)
3. Specialised Mucosa (15%)
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Based upon keratinisation
1. Keratinised
◼ Orthokeratinized
◼ Parakeratinized
2. Non-keratinised
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Based upon Location
1. Buccal Mucosa.
2. Lingual Mucosa.
3. Palatal Mucosa.
4. Labial Mucosa.
5. Alveolar Mucosa
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ClassificationChandra (1 January 2004). Textbook of Dental and Oral
Histology and Embryology with MCQs
◼ Oral mucosa can be divided into three
main categories based on function
and histology:
1. Masticatory mucosa (25%),
keratinized stratified squamous epithelium,
found on the dorsum of the tongue, hard
palate and attached gingiva.
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2. Lining mucosa (60%),
nonkeratinized stratified squamous
epithelium, found almost everywhere else
in the oral cavity, including the:
a. Buccal mucosa refers to the inside
lining of the cheeks and floor of the mouth
and is part of the lining mucosa
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b. Labial mucosa refers to the inside lining of
the lips and is part of the lining mucosa.
c. Alveolar mucosa refers to the lining
between the buccal and labial mucosae. It is a
brighter red, smooth and shiny with many
blood vessels, and is not connected to
underlying tissue by rete pegs
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3. Specialized mucosa (15%), specifically
in the regions of the taste buds on lingual
papillae on the dorsal surface of the
tongue that contains nerve endings for
general sensory reception and taste
perception
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Structure of Oral Mucosa
◼ Epithelium
◼ Lamina Propria.
◼ Submucosa
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Epithelium
◼ Epithelium of the oral mucosa is stratified
squamous
◼ It may be
1.Keratinized
2.Non keratinized
epithelium
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Keratinized layer
◼ Ortho keratinized
◼ Para keratinized
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keratinisation and nonkeratinization
Keratinisation:
Inflexible, tough, resistant to abrasion and
tightly bound to lamina propria. The
mucosal surface results from formation of
a surface layer of keratin and process of
maturation is called keratinisation or
cornification.
Shows 4 stratae:Stratum basale, Stratum
spinosum, Stratum granulosum, Stratum
corneum.
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Keratinised Epithelium
(Electron Microscopy)
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Oral epithelium
◼ Consists of two populations of cells:
◼ Progenitor population
◼ Maturing population
◼ Progenitor cells function is to divide and
provide new cells.
◼ Maturing cells continually undergo a
process of differentiation or maturation to
form a protective layer
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Non – keratinized epithelium
◼ Nonkeratinized epithelial cells in the
superfacial layers do not have keratin
filaments in the cytoplasm
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Difference◼ Keratinized
◼ Layers - basal,
spinosum,
granular,
cornified layer.
◼ Produce a
cornified surface
layer.
◼ Prickly
appearance.
Nonkeratinized
Layers basal,
intermediate, surface
layer.
Do not produce a
cornified surface layer.
Intercellular spaces not
obvious-no prickly
appearance
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Lamina Propria
Two Layers
◼ Papillary layer
Close to epithelial ridges.
Arranged loosely.
◼ Reticular layer
Parallel to epithelium.
Fibers are very thick.
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Cells found in lamina propria◼ Fibroblast
◼ Histiocytes
◼ Macrophages
◼ Mast cell
◼ Polymorph nuclear leucocytes
◼ Lymphocytes
◼ Plasma cells
◼ Endothelial cells
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Submucosa◼ It attaches the mucous
membrane to the
underlying structures –
muscle or bone
◼ loose or a firm attachment
and consists of glands,
blood vessels, nerves, &
adipose tissues.
◼ connective tissue of
various thickness
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Lining mucosa
◼ Covers the floor of mouth, ventral
(underside) tongue, alveolar mucosa,
cheeks, lips and soft palate.
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Lips, covered by lining mucosa◼ Lip has skin on outer surface and labial mucosa
on inner surface
◼ Between these tissues lie
vermillion/red/transition zone
◼ Lips have striated muscle that are part of
muscles of facial expression
◼ Minor mucous salivary glands in submucosa
beneath oral mucosa
◼ Skin on outer surface is similar to skin elsewhere
with a keratinised layer of epithelium on a bed of
connective tissue
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Vermilion zone, Junction between the skin and
mucous membrane of the lip
◼ Lacks appendages of skin
◼ Occasional sebaceous glands at corner of
mouth
◼ Requires constant moistening to prevent
drying
◼ Epithelium: keratinised but thin and
translucent
◼ CT papillae of lamina propria long, narrow;
has capillary loops. Hence the red colour
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Labial mucosa and cheek
◼ Inner surface of lip
◼ Covered by relatively thick non keratinised
epithelium
◼ Wide lamina propria
◼ Short irregular papillae
◼ Submucosa with minor salivary glands Dense
CT strands bind mucosa to underlying orbicular
is ores
◼ Sebaceous glands may be present in cheek as
Fordyces spots
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Labial mucosa
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cheek
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Masticatory mucosa
◼ Covers areas like hard palate and
gingiva which are exposed to
compressive and shear forces and to
abrasion during mastication of food.
◼ Epithelium: moderately thick, frequently
orthokeratinised though areas of
parakeratinisation may be seen
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◼ Junction between epithelium and lamina
propria: convoluted with numerous
elongated papillae
◼ Lamina propria: thick, contains dense
network of collagen fibres as large closely
packed bundles enabling mucosa to resist
heavy loading.
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Mucosa of the Tongue –
Specialised mucosa
◼ Anatomical division
◼ It is divided into two parts by a V-shaped
groove known as sulcus terminalis.
◼ Anterior 2/3rd or papillary portion or body
of the tongue contains lingual papillae.
◼ Posterior 1/3rd is lymphatic portion or
base of the tongue contains lingual tonsil.
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The different papillae found on the
dorsal surface of the tongue are:
◼ Filliform papillae
◼ Fungiform papillae
◼ Circumvallate papillae
◼ Foliate papillae
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Filliform papillae
◼ Pointed extensions of the keratinized
epithelial cells
◼ Most numerous papillae of the tongue
◼ Not associated with taste buds
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Fungiform papillae
◼ Fewer than the filliform papillae
and are scattered over the dorsal
surface of the tongue
◼ Rounded elevations above the
surface of the tongue
◼ Have taste buds on their
superior surfaces
◼ Not keratinized
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Circumvallate papillae
◼ Located at the junction of the anterior two
thirds (body) and posterior one thirds
(base) of the tongue
◼ There are eight to twelve in number
◼ Lined with taste buds and also openings of
serous glands
◼ The secretion from the serous glands
washes away food for renewal of taste
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Circumvallate papillae
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Foliate papillae
◼ Located in the furrows along the posterior
sides of the tongue
◼ Lined with taste buds
◼ Not prominent in human beings
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Foliate papillae
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Taste budShier, David (2016). Hole's Human Anatomy and Physiology.
◼ Taste buds contain the taste receptor
cells, which are also known as gustatory
cells. The taste receptors are located
around the small structures known
as papillae found on the upper surface of
the tongue, soft palate, upper esophagus,
the cheek, and epiglottis.
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Taste buds are small structures present
within the papillae of the tongue
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FunctionSusan Standring (editor in chief)] (2008). "Chapter 33: NECK AND UPPER
AERODIGESTIVE TRACT". Gray's anatomy : the anatomical basis of clinical
practice
◼ Lingual papillae, particularly filiform
papillae, are thought to increase the
surface area of the tongue and to increase
the area of contact and friction between
the tongue and food.This may increase the
tongue's ability to manipulate a bolus of
food, and also to position food between
the teeth during mastication (chewing) and
swallowing.
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Lingual papillae localization
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Hard Palate
◼ Covered by masticatory mucosa lateral
regions of the posterior part contains
palatine glands
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Gingiva
◼ Covers the alveolar process of jaws and
surrounds the cervical portion of teeth.
◼ It develops from the union of oral
epithelium and reduced enamel epithelium
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◼ Gingiva can be classified as
◼ Free gingiva,
◼ Attached gingiva and
◼ Interdental papilla
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Oral Manifestations of Systemic
Diseases at eMedicine
◼The oral cavity has sometimes
been described as a mirror that
reflects the health of the
individual.
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Mak, Karen (2009). "Scarless healing of oral mucosa is characterized by faster
resolution of inflammation and control of myofibroblast action compared to skin
wounds in the red Duroc pig model". Journal of Dermatological Science.
◼The oral mucosa tends to heal
faster and with less scar
formation compared to the skin.
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oral lesions
PRIMARY LESION:
◼ Macule, Plaques, Papule, Patch
◼ Nodule, Tumor
◼ Vesicle, Bulla, Pustule
◼ Petechia, Ecchymosis
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SECONDARY
LESION
◼ Erosion,
◼ Ulcer,
◼ Scar,
◼ Infiltration.
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Oral Examination
◼ Many diseases (systemic or local) have
signs that appear on the face, head &
neck or intra-orally.
◼ Making a complete examination can
help you create a differential diagnosis
in cases of abnormalities and make
treatment recommendations based on
accurate assessment of the signs &
symptoms of disease.
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◼ Each disease process may have
individual manifestations in an
individual patient
◼ And there may be individual host
reaction to the disease
◼ Careful assessment will guide the
clinician to accurate diagnosis
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Equipment◼ Assure that you have all the supplies
◼ necessary to complete an oral
examination
◼ Mirror
◼ Tissue retractor (tongue blade)
◼ Dry gauze
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Equipment
◼ You must dry some of the tissues in
order to observe the nuances of any
color changes
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Breath
◼ Oral odors can indicate:
◼ Infection: caries, periodontal dx
◼ URT infections
◼ Chronic G.I. disturbances
◼ Lung abscess
◼ Diabetic acidosis
◼ Uremia, kidney problem
◼ Liver failure: mousy, musty odor
◼ Self-medication with alcohol
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Extra-oral examination
◼ Observe: color of skin, eyes
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Extra-oral examination
◼ Major salivary glands (palpation)
◼ -Position
◼ -Size
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Extra-oral examination
◼ TMJ
◼ Palpate upon opening
◼ Use stethoscope to
listen to sounds
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Extra-oral examination
◼ Digestion mussels –
m. masseter m.
temporalis
◼ Bidigital palpation
during function
◼ Pain?
◼ Trismus (lockjaw)
◼ Tumors?
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Extra-oral examination
◼ Lymph node palpation
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Intra-oral examination,
Exam: Lips
◼ Observe the color & its consistency:
intra-orally and
◼ externally
◼ Is the vermillion border distinct?
◼ Bi-digitally palpate the tissue around
the lips. Check for
◼ nodules, bullae, abnormalities,
mucocele, fibroma
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Exam: Lips
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Exam: Lips
◼ Clear mucous filled pockets may be
seen on the inner side of the lip
(mucocele). This is a frequent, non-
pathologic entity which represents a
blocked minor salivary gland
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Exam: Lips
◼ Evert the lip and examine the tissue
◼ Observe frenum attachment/tissue
tension
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Examination: Buccal Mucosa
◼ Observe color, character of the mucosa
◼ Normal variations in color among
ethnic groups
◼ Amalgam tattoo
◼ Palpate tissue
◼ Observe Stenson’s duct opening for
inflammation or signs of blockage
◼ Visualize muscle attachments, hamular
notch, pterygomandibular folds
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Examination: Buccal Mucosa
◼ Linea alba
◼ Stenson’s duct
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Examination: Buccal Mucosa
◼ Lesions – white, red
◼ Lichen Planus, Leukedema
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Gingiva
◼ Note color, tone, texture, architecture &
mucogingival relationships
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Gingiva
◼ How would you describe the gingiva?
◼ Marginal vs. generalized?
◼ Erythematous vs. fibrous
◼ Drug reactions: Anti-epileptic, calcium
channel blockers, immunosuppressant
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Exam: Hard palate
◼ Minor salivary glands, attached gingiva
◼ Note presence of tori
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Nicotine stomatitis (smoker's
palate)
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Oro-nasal communication
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Ulcerated torus palatinus
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Exam: Soft palate
◼ How does soft palate raise upon “aah”?
◼ Vibrating line, tonsilar pillars, tonsils,
◼ oropharynx
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Exam: Oropharanyx
◼ Color, consistency of tissue
◼ Look to the back, beyond the soft
palate
◼ Note occasional small globlets of
transparent or pink opaque tissue
which are normal and may include
lymphoid tissue
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Exam: Oropharanyx
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Exam: Tonsils
◼ Tucked in at base of anterior &
posterior tonsilar pillars
◼ Globular tissue that has “punched out”
appearing areas
◼ Regresses after adulthood
◼ May see white “orzo rice like” or
“torpedo” shaped white concretions
within the tissue
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Exam: Tongue
◼ The tongue and the floor of the mouth
are the most common places for oral
cancer to occur
◼ It can occur other places; so visualize
all areas
◼ You may observe:
◼ Circumvalate papillae, epiglottis
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Exam: Tongue
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Exam: Tongue
◼ You may observe lingual varicosities
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Exam: Tongue
◼ You may observe geographic tongue
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Exam: Tongue
◼ You may observe oral cancer
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Exam: Floor of mouth
◼ Visualize, palpate - bimanually
◼ Wharton’s duct
◼ Must dry to observe
◼ Does “lesion” wipe off ?
◼ Where are the two most likely areas for
oral cancer?
◼ lateral border of the tongue
◼ Floor of mouth
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Palpation of the floor of the
mouth
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“Ranula”
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BLOOD INVESTIGATIONS
◼ These can detect abnormalities such as
◼ Infection
◼ Anaemia
◼ Allergies
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Blood investigation helps in
diagnosing◼ Leukopenia
◼ Thrombocytopenia
◼ Myeloma
◼ Anemia *Iron deficiency
Aplastic
Sickle cell anemia
Thalassemia
◼ Acute and Chronic leukemia
◼ liver disease
◼ Myxedema
◼ Diabetes
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COLLECTION OF BLOOD
SAMPLE
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◼ WBC count
◼ •Differential
◼ Leukocyte count
◼ •RBC count
◼ •Hemoglobin
◼ •Hematocrit
◼ •Erythrocytes indices
◼ •Platelet Count
◼ •Bleeding time
◼ •Capillary Fragility Test
◼ •Clotting Time
◼ •Erythrocyte Sedimentation Rate
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WBC
◼ White blood cell count (WBC or leukocyte
count)
◼ WBC differential count
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RBC◼ Red blood cell count (RBC or erythrocyte
count)
◼ Hematocrit (Hct)
◼ Hemoglobin (Hbg)
◼ Mean corpuscular volume (MCV)
◼ Mean corpuscular hemoglobin (MCH)
◼ Mean corpuscular hemoglobin
concentration (MCHC)
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PLATELET
◼ Platelet count
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Other investigation
◼ Cytological examination
◼ Biopsy
◼ bacteriological
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CLASSIFICATION OF ORAL
DISEASES
◼ Based on etiology: viral, traumatic
◼ Based on the pathological process
involved: inflammatory, neoplastic
◼ Based on symptoms: recurrent, painful
conditions, tumorous conditions
◼ Based on clinical appearance of lesions:
ulcerative, vesicular, erosive
◼ Based on origin: developmental, acquired
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At the department of hospital dentistry MMSI
used in teaching and clinical work following
classification of diseases of the oral mucosa.
◼ I. Traumatic injuries (mechanical,
chemical, physical), namely traumatic
erythema, erosion, ulcers, leukoplakia,
nicotine leykokeratoz, actinic cheilitis,
radiation, chemical damage, etc.
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◼ II. Infectious diseases:
◼ 1) viral (herpetic stomatitis, herpes zoster, foot
and mouth disease, viral warts, influenza);
◼ 2) necrotizing stomatitis Vincent;
◼ 3) bacterial infections (strep stomatitis, pyogenic
granuloma, shankriformnaya pyoderma,
tuberculosis, etc.);
◼ 4) venereal diseases (syphilis, gonorrheal
stomatitis);
◼ 5) fungal infections (candidiasis, actinomycosis,
etc.).
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◼ III. Allergic diseases (angioedema, allergic
stomatitis, cheilitis and glossitis, drug stomatitis,
glossitis, cheilitis, erythema multiforme, chronic
recurrent aphthous stomatitis, etc.).
◼ IV. Changes in the oral mucosa at the
exogenous intoxications.
◼ V. Changes in the oral mucosa in some systemic
diseases, and metabolic diseases (hypo-and
avitaminosis, endocrine, gastrointestinal tract,
cardiovascular system, blood system, nervous
system, collagen).
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◼ VI. Changes in the oral mucosa with dermatoses (pemphigoid, dermatitis herpetiformis Duhring, lichen planus, lupus erythematosus).
◼ VII. Anomalies and distinct diseases language (wrinkled, diamond, desquamative, etc.).
◼ VIII. Self cheilitis (granular, exfoliative, etc.).
◼ IX. Precancerous (obligate and facultative) and tumors (benign and malignant).