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Salivary Glands and Saliva
Presented by-
Dr Arpita Dutta
CONTENTS
Salivary Glands Saliva
INTRODUCTION
DEFINITION
CLASSIFICATION
EMBRYOLOGY
DEVELOPMENT
HISTOLOGY
ANATOMY
NEURAL REGULATION
SALIVA FORMATION
SALIVARY GLAND PATHOLOGY
IMAGING MODALITIES
CONCLUSION
REFERENCES
 INTRODUCTION
 COMPOSITION
 PROPERTIES OF SALIVA
 PROSTHODONTIC
CONSIDERATIONS
 SALIVA AS A DIAGNOSTIC TOOL
 METHODS OF COLLECTION OF
SALIVA
 CONCLUSION
 REFERENCES
DEFINITION
Salivary Glands-
The salivary glands are group of
compound exocrine glands
secreting saliva.
-Orban’s Oral Histology &
Embryology, 14th Edition
CLASSIFICATION
SALIVARY GLANDS
BASED ON ANATOMY
MAJOR SALIVARY GLANDS
• PAROTID GLAND
• SUBLINGUAL GLAND
• SUBMANDIBULAR GLAND
MINOR SALIVARY GLANDS
• LABIAL AND BUCCAL GLANDS
• GLOSSOPALATINE GLANDS
• PALATINE GLANDS
• LINGUAL GLANDS
• -BLANDIN &NUHN
• -VON EBNER’S GLAND
• CARMALT’S GLANDS
SALIVARY GLANDS
BASED ON SECRETION
SEROUS
MUCOUS
MIXED
(Orbans Oral Histology & Embryology, 14th edtn)
PAROTID
GLAND
• PURELY
SEROUS
SUBLINGUAL
GLAND
• MIXED (mainly
MUCOUS)
SUBMANDIBU
LAR GLAND
• MIXED (mainly
SEROUS)
LABIAL
AND
BUCCAL
GLANDS
• MIXED
GLOSSOPHAR
YNGEAL AND
PALATINE
GLANDS
• MUCOUS
LINGUAL
GLANDS
• MIXED
VON
EBNER’S
GLAND’S
. SEROUS
(Orbans Oral Histology & Embryology, 14th Edition
EMBRYOLOGY
Time of origin
Gland Location Intra uterine life
Parotid gland Corners of the stomodeum as placode 6th week I.U
Submandibular gland Floor of the mouth End of 6th week I.U
Sublingual gland Lateral to S.m.primordium 8th week I.U
Minor salivary glands Buccal Epithelium 12th week I.U
Maturity of secretory end piece: During last 2 months of gestation.
David T. Wong Salivary Diagnostics, Wiley-Blackwell
David T. Wong Salivary Diagnostics, Wiley-Blackwell
DEVELOPMENT
BUD FORMATION CORD FORMATION
BRANCHING OF
CORDS
LOBULE FORMATIONCANALIZATION
CYTODIFFERENTIATION
(Orbans Oral Histology & Embryology, 13th edtn)
STAGES OF DEVELOPMENT-
•BUD FORMATION
•CORD FORMATION
•BRANCHING OF CORDS
•LOBULE FORMATION
•CANALIZATION
•CYTODIFFERENTIATION
PAROTID GLAND
Parotid gland:
-Largest salivary gland
-20-25% of total saliva.
-Pyramidal in shape.
-Weighs around 20-30g.
-Superficial portion of gland is located subcutaneously, in front of the external
ear & deeper portion lies behind ramus of mandible.
-4 surfaces: superior, superficial, anteromedial, posteromedial
-3 borders- anterior, medial, posterior
-Associated with facial nerve (pes anserinus)
Stenson’s duct:
-35- 40mm long
Runs forward across masseter
muscle, turns inwards at the
anterior border of masseter
Runs through the 3Bs-
Buccal pad of fat
Buccopharyngeal fascia
Buccinator Muscle
- opens at a papilla opposite the
second maxillary molar.
Arterial supply-External carotid artery
Venous drainage-External jugular vein
Lymphatic drainage-Upper deep
cervical lymph nodes.
Nerve supply: Greater auricular and Auriculotemporal nerve
Sympathetic-
From the sympathetic plexus
around the external carotid artery
Parasympathetic
SUBMANDIBULAR GLAND
10 to 15 gm. Size of a Walnut
65-70% of total saliva.
Located at Posterior portion of floor of mouth, medial aspect of mandible & wrapping
around posterior border of mylohyoid.
3 surfaces-Inferior, Medial, Lateral
The post. Border of
mylohyoid divides the
gland:
Superficial lobe : situated in the digastric
triangle wedged between body of
mandible and mylohyoid
Small deep lobe: lying in the floor of the
mouth between mylohyoid and the
hyoglossus muscle on the lateral aspect of
the tongue
RELATIONS OF THE SUBMANDIBULAR
GLAND
SUBMANDIBULAR DUCT
•Wharton's duct runs forward and opens into the mouth beneath the tongue,
lateral to lingual frenum i.e sublingual caruncle.
•40mm
Blood supply: Facial and lingual
arteries. Veins correspond to
arteries, drain into internal
Jugular Vein
Lymphatic drainage:
Submandibular lymph node &
jugulodigastric nodes.
Nerve supply:
•Parasympathetic supply: Facial
nerve reaching gland through the
lingual nerve & submandibular
ganglion.
• Sympathetic
Supply:Postganglionic fibers from
plexus on facial artery
SUBLINGUAL GLAND
Smallest major salivary gland
Weighs- 2gm.
2.5% of total saliva.
Located at anterior part of floor of
the mouth, just between mucosa &
mylohyoid muscle.
Saliva is poured into a series of small
ducts (duct of Rivinus) and open
through large duct- Bartholin’s duct,
that opens with submandibular duct
at the caruncula sublingualis.
Essentials of Medical Physiology, Sembulingam 4th Edition
Blood supply: Sublingual & submental arteries.
Lymphatic drainage: Submental lymph nodes
Nerve supply:
Parasympathetic supply: Facial nerve reaching gland
through the lingual nerve & submandibular ganglion.
Sympathetic Supply:
-Postganglionic fibers from plexus on facial artery.
MINOR SALIVARY GLANDS
Labial and buccal glands- Lips and cheek
Glossopalatine- isthmus in glossopalatine fold
 Palatine glands- lamina propria of the posterolateral region of hard palate
submucosa of the soft palate and the uvula
 Lingual–
•Anteriorlingual GLANDS OF BLANDIN AND NUHN -apex of the tongue
• Posterior Lingual (mucous)- lateral and posterior to the vallate papilla
• Posterior lingual( serous) VON EBNER’S GLANDS- between the muscle
fibers of the tongue below the vallate papilla.
HISTOLOGY
ACINI- TERMINAL SECRETORY UNIT.
LEADING INTO DUCTS
OPEN TO ORAL CAVITY AND
SECRETION TO ANATOMIC
LOCATION
SEROUS CELLS MUCOUS CELLS
DUCTAL SYSTEM
MYOEPITHELIAL CELLS
BASKET CELLS
.
stellate or spider like cells
flattened nucleus
surrounded by -
•small amount of perinuclear
cytoplasm
•long branching process that
embracing the secretory duct
cells.
CONNECTIVE TISSUE
•Same as connective tissue
in other parts of body
•Contain macrophages,
plasma cells, fibroblasts,
macrophages, mast cells
•Extension of connective
tissue into septa lobulates
the gland
serous salivary gland
serous acini, zymogen granules
intercalated ducts and striated
ducts
interlobular ducts with
stratified epithelium.
lobules with connective tissue
septa.
nearby lymph node with
capsule.
PAROTID GLAND HISTOLOGY
.mixed salivary gland
predominantly serous acini;
some mucous acini with
serous demilunes
short intercalated ducts.
striated ducts with simple
cuboidal lining epithelium.
interlobular ducts with
stratified cuboidal or
stratified columnar
epithelium surrounded by
connective tissue.
PAROTID GLAND HISTOLOGYPAROTID GLAND HISTOLOGY
SUBMANDIBULAR GLAND HISTOLOGY
.mixed salivary gland
predominantly mucous acini; some
serous demilunes.
acini are composed of centrally-
located mucous cells and
peripheral serous demilunes.
short intercalated ducts.
striated ducts with simple
columnar lining epithelium
interlobular ducts with stratified
cuboidal/columnar epithelium,
surrounded by connective tissue.
SUBLINGUAL GLAND HISTOLOGY
PHYSIOLOGICAL FACTORS AFFECTING SALIVATION
TASTE OF EATABLES
SURFACE OF OBJECT
DEHYDRATIONAGE
EMOTIONS AND
PSYCHOLOGICAL EFFECTS
INCREASED
SALIVATION
DECREASED
SALIVATION
Syllabus of Complete Dentures, Charles M. Heartwell and Arthur O. Rahn, 4th edtn
PHASE OF SALIVATION
• SMELLS
• VIEW
CEPHALIC
• TASTE
• TACTILE
BUCCAL
• IRRITATION
GASTROINTESTINAL
Syllabus of Complete Dentures, Charles M. Heartwell and Arthur O. Rahn, 4th edtn
FORMATION OF SALIVA
• TWO STAGE MODEL of saliva secretion
Physiology, Robert M. Berne and Matthew N. Levy, 3rd edth
NEURAL REGULATION OF SALIVARY SECRETION
PATHOLOGIES OF SALIVARY GLANDS
• ABERRANT GLANDS
• APLASIA AND HYPERPLASIA
• ATRESIA
DEVELOPMENTAL
DISORDERS
• SIALOLITHIASIS
• MUCOCELE
• NECROTIZING SIALOMETAPLASIA
OBSTRUCTIVE
DISORDERS
• BENIGN
• MALIGNANT
NEOPLASTIC
DISORDERS
• SJOGREN’S SYNDROME
• RADIATION
• XEROSTOMIA
DEGENERATIVE
CONDITIONS
• VIRAL
• BACTERIAL
INFLAMMATORY
DISORDERS
Textbook of Oral Medicine, A.V.Ghom, 3rd edtn
DEGENERATIVE CONDITION- SJOGREN’S
SYNDROME
• A.k.a Gougerot Sjogren’s Syndrome/ Sicca Syndome
• It is an autoimmune disorder described as a triad of :
-Keratoconjuctivitis sicca
-Xerostomia
-Rheumatoid arthritis
Two types:
-Primary
-Secondary
Keratocon
junctivitis
sicca
Xerostomia
Rheumat
oid
arthritis
Sjogren’s
syndrome
Clinical freatures:
•Dry mouth and dry eyes
•Dry and fissured tongue
•Primary sjogren’s syndrome are
associated with parotid gland
enlargment, purpura,
lymphadenopathy.
Treatment:
1. Ocular lubricants and salivary
substitutes,
2. maintenance of oral hygiene
3. Frequent fluoride application,
4. sialogogues.
Fig- DRY AND FISSURED
TONGUE
SALIVARY GLAND IMAGING MODALITIES
1. PLAIN FILM RADIOGRAPHY
• OCCLUSAL VIEW
• ORTHOPANTOGRAPH
• LATERAL OBLIQUE
• POSTERIOR ANTERIOR SKULL
PROJECTION
2. SIALOGRAPHY
3. ULTRASONOGRAPHY
4. SCINTIGRAPHY
5. COMPUTED TOMOGRAPHY
6. MAGNETIC RESONANCE IMAGING
Fig:- MANDIBULAR OCCLUAL
VIEW OF A CALCIFIED STONE IN
THE WHARTON’S DUCT
SCINTIGRAPHY
AXIAL CT
SIALOGRAPHY
SIALOGRAPHY
• Retrograde injection of a iodinated
contrast agent into the ductal system
of a salivary gland.
• Oldest imaging modality.
• First sialogram performed by CARPY
1904 on an isolated parotid using
mercury as a contrast agent.
• Simple, quick and painless procedure
AMAMENTARIUM
Sialography catheters
Lacrimal probes
Iodinated contrast agent
Cotton rolls
Maxillofacial Imaging, Angelo. M DelBalso
CONTRAST AGENTS
INJECTION TECHNIQUES
HYDROSTATIC
INJECTION
DISTENTION
INJECTION
HAND
INJECTION
FAT SOLUBLE
• ETHIODOL
• LIPIODOL
• PANTOPAQUE
WATER SOLUBLE
• ANGIOGRAPHIC
DYES
• SINOGRAFIN
PHASES OF SIALOGRAPHY
DUCTAL PHASE ACINAR PHASE
EVACUATION AND
POST-EVACUATION
PHASE
Maxillofacial Imaging, Angelo. M DelBalso
Saliva
INTRODUCTION
Saliva is a viscous, transparent liquid
secreted by cells of the salivary
glands.
Salivary flow facilitates-
1. Speech
2. Mastication
3. Food Bolus Formation And Its
Swallowing
4. General Oral Health And
Function.
It plays a critical role in retention of
dentures due to its lubricating
function and, thus, dry mucosa
often leads to compromise in the
retention of prosthesis.
DEFINITION
“Saliva is clean, tasteless, odourless, slightly acidic viscous fluid,
consisting of secretions from the parotid, sublingual,
submandibular salivary glands and the mucous glands of the
oral cavity.” - Stedmans medical dictionary 26th edition
• Saliva is a clear, alkaline, somewhat viscid secretion from the
parotid, submandibular, sublingual & smaller mucous glands
of the mouth. – Dorland Medical dictionary
• Saliva is a complex fluid produced by the salivary glands , the
most important function of which is to maintain the well
being of the oral cavity . – Tencate’s Book of Oral Histology
WHOLE / TOTAL SALIVA
FLOW
RATE(ML/MIN)
WHOLE SALIVA PAROTID GLAND SALIVA SUBLINGUAL GLAND AND
SUBMANDIBULAR GLAND
SALIVA
RESTING STATE 0.2-0.4 0.04 0.1
STIMULATED
STATE
2.0-5.0 1.0-2.0 0.8
pH 6.7-7.4 6.0-7.8 6.0-7.4
Ten Cate’s Oral Histology, Development, Structure, and Function, Seventh Edition
COMPOSITION
WATER-99.5%
SOLID -0.5%
SOLID COMPOSITION OF SALIVA
ORGANIC
• SECRETORY PROTEINS:
• ENZYMES
 AMYLASE,RIBONUCLEASE,KALLIKREIN
 ESTERASE,CYSTATIN,PEROXIDE
 LYSOZYMES,LACTOFERRIN
 ACID PHOSPHATASE
 PROLINE RICH PROTEINS
 GLYCOPROTIENS
• IMMUNOGLOBULINS
 IgG, IgM, IgA
• BLOOD CLOTTING FACTORS
• DESQUAMATED EPITHELIAL CELLS
• MICROORGANISMS PRODUCTS
• LEUKOCYTES
• SERUM REMNANTS
INORGANIC
• ELECTROLYTES
 SODIUM
 POTASSIUM
 CALCIUM
 CHLORINE
 BICARBONATE
 PHOSPHATE
 MAGNESIUM
 SULPHATE
 IRON
 IODINE
FUNCTIONS
• LYSOZYMES+LACTOFERRIN+LACTOPEROXI
DASE+IMMUNOGLOBULINS+CYSTATINS
ANTI BACTERIAL
• IMMUNOGLOBULINS+CHROMOGRAINSANTIFUNGAL
• CYSTATINS+MUCINS+IMMUNOGLOBULIN
S+SECRETORY LEUKOCYTE
ANTI VIRAL
BUFFER
• BICARBONAT
E
PHOSPHATE
PROTEINS
PROTECTION
AGAINST
DEMINERALIZ
ATION
•MUCINS
CALCIUM
PHOSPHATE
LUBRICATION
GLYCOPROTEINS
MUCINS
REMINERALIZAT
ION
STATHERIN
PHOSPHATE
CALICUM
Bolus formation
MUCINS+WATER
Taste of eatables
GUSTIN+WATER
Digestion of food
AMYLASE+PROTEASE+LIPASE
PROPERTIES
• Total amount : 1,200 – 1500 ml in 24 hrs. A large
proportion of this volume is secreted at meal time, when
the secretory rate is highest.
• Consistency : slightly cloudy, due to presence of cells
and mucin.
• pH : usually slightly acidic (ph 6.35 – 6.85)
• Specific gravity : 1.002 – 1.012
• Freezing point : 0.07 – 0.340c.
Total volume secreted 1200ml to 1500ml/day
PAROTID GLAND
SUBLINGUAL GLAND MINOR GLANDS
SUBMANDIBULAR
GLAND
20%
7- 8% <10%
65-70%
Saliva composition and functions: A comprehensive Review, The Journal of Contemporary
Dental Practice vol(9),no 3,2008
FACTORS AFFECTING COMPOSITION OF SALIVA
Time of the day
Source of secretion
Pathology
Flow rate
Differential gland contribution
Circadian rhythm
Nature of stimuli
Diet and hydration
David T. Wong Salivary Diagnostics, Wiley-Blackwell
SALIVA: A DIAGNOSTIC TOOL
SALIVA
BACTERIA
VIRUSES
NEOPLASTIC
CONDITIONS
SYSTEMIC
DISEASE
BIOMARKERS
DRUG ABUSE
CONDITIONS
David T. Wong Salivary Diagnostics, Wiley-Blackwell
Salivary testing is becoming more common as clinicians have begun to
appreciate its advantages & investigators defined its worth. Saliva proves
to be a reflection of the body.
SYSTEMIC DISEASES-
• HEREDITARY DISEASES- CYSTIC FIBROSIS
• AUTOIMMUNE DISEASES- SJOGREN’S SYNDROME
• MALIGNANCIES- ADENOCARCINOMA, BREAST CARCINOMA,
OVARIAN CANCER (MARKERS)
VIRAL INFECTION MARKERS-
• HIV
• OTHER VIRAL DISEASES (due to immunoglobulins present in saliva)
SALIVA AS A DIAGNOSTIC TOOL
DRUG MONITORING-
• THERAPEUTIC- Carbamazepine, Diazepam, Ethosuximide,
Lithium, Tolbutamide, etc
• RECREATIONAL- Nicotine, Cocaine, Barbiturates,
Benzodiapines, Marijuana, etc
MONITORING OF HORMONE LEVELS
DIAGNOSIS OF ORAL CONDITIONS ASSOCIATED
WITH DEEPER SYSTEMIC CONDITIONS
• Forensic odontology- serological and cellular
analysis of saliva aids in identification of accused
-Saxena S, Kumar S. Saliva in forensic odontology: A comprehensive update. J Oral
Maxillofac Pathol [serial online] 2015 [cited 2016 Apr 24];19:263-5.
• Salivary pH assessment using telemetry:
Device called telemetry system is incorporated in the
denture which has a radiosensitive diode, oscillator, ph
sensor, and a computer analyzer
METHODS OF COLLECTION OF SALIVA
• Draining method- funnel placed near lip and
patient asked to expectorate saliva into the
funnel to collect in a pre-weighed test tube
• Spitting method- saliva allowed to
accumulate in the floor of the mouth and
then spat into a pre-weighed tube. For
stimulated saliva patient is asked to chew on
paraffin.
• Suction method- saliva is aspirated into a
pre-weighed container using a saliva ejector.
• Absorbent method- preweighed swab,
cotton roll, gauze sponge.
• Adhesion
• Cohesion
• Surface Tension
• Capillary Attraction
• Atmospheric Pressure
• Viscosity of Saliva
62
ROLE OF SALIVA IN COMPLETE DENTURE RETENTION
Adhesion:
It is achieved through ionic forces between
charged salivary glycoproteins and surface
epithelium or acrylic resin.
According to Bernard Levin– the most
adhesive saliva is thin but containing some
mucous component
Cohesion:
It is a retentive force because it occurs within the
layer of fluid (saliva) that is present between the
denture base and the mucosa and works to
maintain the integrity of the interposed fluid.
Interfacial force/ Surface tension
• It is the resistance to separation of two
parallel surfaces that is imparted by a film of
liquid between them.
• It is dependent on the ability of the fluid to ‘
wet’ the rigid surrounding material
(WETTABILITY).
Capillary Action
• Capillarity is what causes a liquid to rise in
capillary tube
•
• When adaptation of denture base to mucosa
on which it rests is sufficiently close, the
space filled with thin film of saliva acts like
capillary tube in that liquid ,seeks to
increase contact with both denture and
mucosal surface.
Atmospheric pressure
•The cohesive forces result in the
formation of a concave meniscus at the
surface of the saliva in the border
region of the denture.
•When a fluid film is bounded by a
concave meniscus the pressure within
the fluid is less than that of the
surrounding medium;
•Thus a pressure differential will exist
between saliva film and air and thereby
aids in the retention of the denture
XEROSTOMIA AND HYPERSALIVATION
XEROSTOMIA
• Dry mouth/ pasties/ cotton mouth
• Hyposalivation or Aptyalism
Causes-
• Dehydration or Renal Failure
• Sjogren’s Syndrome
• Radiotherapy
• Trauma to Salivary gland or duct
• Drugs
• Smoking of marijuana/cannabis
• Shock
HYPERSALIVATION
• Excess saliva secretion
• Physiological- Pregnancy
• Pathological is called Ptyalism,
Sialorrhea, Sialosis
Causes-
• Decay of tooth or a neoplasm
• Disease of foregut, stomach or
intestine
• Cerebral Palsy
• Parkinsonism
DID YOU KNOW?
In ancient China, a suspect would be made to chew dry rice while being questioned.
When the suspect spat out the rice, they were assumed to be guilty if the grains
remained stuck to their tongue. The reason was that the stress caused slow saliva flow
and induced a dry mouth (activation of the sympathetic nervous system).
PROSTHODONTIC MANAGEMENT OF
PATIENT WITH XEROSTOMIA
In dry environment, fixed non
tissue bearing prosthesis are
preferred where indicated
FPDs should have full coverage
retainers and easily cleaned
pontics and connectors
Margins of retainers should be
supragingival
Health of residual teeth and
periodontal tissues
Use of gingivally approching
clasp avoided
Tooth supported denture with
minimal tissue coverage
Metal denture bases are
preferred
FIXED PARTIAL DENTURE
PROSTHESIS
REMOVABLE PARTIAL
DENTURE PROSTHESIS
Procedures -aim at optimizing
retention and stability
Use dentures with metal bases
Use of soft liners to improve
comfort
Use of denture adhesives to
augment retention
Frequent recall – As more prone
to candidal infections
COMPLETE DENTURE
PROSTHESIS
TREATMENT OPTIONS
•Use of sialogogues
•Saliva reservoirs
•Flexible dentures
SALIVA RESERVOIS
Pattanaik B, Pattanaik S. Prosthetic rehabilitation of a xerostomia patient with a
mandibular split salivary reservoir denture. Annals and Essences of
dentistry 2010;3:32–5
SPLIT DENTURES
Mendoza AR, Tomlinson MJ. The split denture: a new technique for
artificial saliva reservoirs in mandibular dentures. Aust Dent
J 2003;48:190–4
Flexible dentures
Saliva substitutes are contraindicated in
• asthma
• iritis
• Glaucoma
limitations of the split dentures
• Require adequate vertical dimension
• Structure weakened
• repair and relining are difficult
• Too bulky
Flexible dentures-
• Long lasting
• do not warp or become brittle
• exhibit better accuracy
• softer material locks into the undercuts of the
ridges thereby adapting to the constant
movement
• Can retain a small percentage of water- more
compatibility and softer than acrylic
• Dental restorations are affected by saliva. They have ability to
dissolve silicates.
• Changes physical properties of various impression materials.
• Causes electro-galvanisation between silver and gold
discolors the restoration, causes pain.
• Hampers clinicians view and contaminates working area.
ISOLATION:
METHODS OF FLUID CONTROL
SALIVA EJECTORS RUBBER DAM
SVEDOPTER
ANTI-SIALOGOGUES RETRACTION CORDS GAUZE AND COTTON ROLLS
IMPLANTS
• Failure of Implants is seen due to microbiota
present in saliva.
• Bacterial species from human saliva may
penetrate along the implant-abutment
interface
• Essentials of Human Anatomy- Head and Neck, 4th Edition- A K Datta
• Orbans Oral Histology & Embryology, 14th Edition
• David T. Wong Salivary Diagnostics, Wiley-Blackwell
• Ten Cate’s Oral Histology, Development, Structure, and Function, Seventh Edition
• Oral Radiology Principles And Interpretation Sixth Edition,Stuart C. White and
Michael J. Pharoah
• Textbook of Oral Medicine, A.V.Ghom, Third Edition
• Physiology, Robert M. Berne and Matthew N. Levy, Third Edition
• Syllabus of Complete Dentures, Charles M. Heartwell and Arthur O. Rahn, Fourth
Edition
• A contemporary review of the factors involved in complete denture retention,
stability, and support. Part I: retention. Jacobson TE, Krol AJ. J Prosthet Dent. 1983
Jan;49(1):5-15.
REFERENCES
•Essentials Of Medical Physiology K. Sembulingam 4th Edition
•Syllabus of Complete Dentures, Charles M. Heartwell and Arthur O. Rahn, 4th
edtn
• Ten Cate’s Oral Histology, Development, Structure, and Function, Seventh
Edition
•Mendoza AR, Tomlinson MJ. The split denture: a new technique for artificial
saliva reservoirs in mandibular dentures. Aust Dent J 2003;48:190–4
•Pattanaik B, Pattanaik S. Prosthetic rehabilitation of a xerostomia patient with
a mandibular split salivary reservoir denture. Annals and Essences of
dentistry 2010;3:32–5
•Saliva composition and functions: A comprehensive Review, The Journal of
Contemporary Dental Practice vol(9),no 3,2008
•Kaufman E, Lamster IB. The diagnostic applications of saliva--a review. Crit Rev Oral Biol
Med. 2002;13(2):197-212.
THANK YOU

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Saliva and salivary glands

  • 1. Salivary Glands and Saliva Presented by- Dr Arpita Dutta
  • 2. CONTENTS Salivary Glands Saliva INTRODUCTION DEFINITION CLASSIFICATION EMBRYOLOGY DEVELOPMENT HISTOLOGY ANATOMY NEURAL REGULATION SALIVA FORMATION SALIVARY GLAND PATHOLOGY IMAGING MODALITIES CONCLUSION REFERENCES  INTRODUCTION  COMPOSITION  PROPERTIES OF SALIVA  PROSTHODONTIC CONSIDERATIONS  SALIVA AS A DIAGNOSTIC TOOL  METHODS OF COLLECTION OF SALIVA  CONCLUSION  REFERENCES
  • 3. DEFINITION Salivary Glands- The salivary glands are group of compound exocrine glands secreting saliva. -Orban’s Oral Histology & Embryology, 14th Edition
  • 4. CLASSIFICATION SALIVARY GLANDS BASED ON ANATOMY MAJOR SALIVARY GLANDS • PAROTID GLAND • SUBLINGUAL GLAND • SUBMANDIBULAR GLAND MINOR SALIVARY GLANDS • LABIAL AND BUCCAL GLANDS • GLOSSOPALATINE GLANDS • PALATINE GLANDS • LINGUAL GLANDS • -BLANDIN &NUHN • -VON EBNER’S GLAND • CARMALT’S GLANDS SALIVARY GLANDS BASED ON SECRETION SEROUS MUCOUS MIXED (Orbans Oral Histology & Embryology, 14th edtn)
  • 5. PAROTID GLAND • PURELY SEROUS SUBLINGUAL GLAND • MIXED (mainly MUCOUS) SUBMANDIBU LAR GLAND • MIXED (mainly SEROUS) LABIAL AND BUCCAL GLANDS • MIXED GLOSSOPHAR YNGEAL AND PALATINE GLANDS • MUCOUS LINGUAL GLANDS • MIXED VON EBNER’S GLAND’S . SEROUS (Orbans Oral Histology & Embryology, 14th Edition
  • 6. EMBRYOLOGY Time of origin Gland Location Intra uterine life Parotid gland Corners of the stomodeum as placode 6th week I.U Submandibular gland Floor of the mouth End of 6th week I.U Sublingual gland Lateral to S.m.primordium 8th week I.U Minor salivary glands Buccal Epithelium 12th week I.U Maturity of secretory end piece: During last 2 months of gestation. David T. Wong Salivary Diagnostics, Wiley-Blackwell
  • 7. David T. Wong Salivary Diagnostics, Wiley-Blackwell
  • 8. DEVELOPMENT BUD FORMATION CORD FORMATION BRANCHING OF CORDS LOBULE FORMATIONCANALIZATION CYTODIFFERENTIATION (Orbans Oral Histology & Embryology, 13th edtn) STAGES OF DEVELOPMENT- •BUD FORMATION •CORD FORMATION •BRANCHING OF CORDS •LOBULE FORMATION •CANALIZATION •CYTODIFFERENTIATION
  • 9. PAROTID GLAND Parotid gland: -Largest salivary gland -20-25% of total saliva. -Pyramidal in shape. -Weighs around 20-30g. -Superficial portion of gland is located subcutaneously, in front of the external ear & deeper portion lies behind ramus of mandible. -4 surfaces: superior, superficial, anteromedial, posteromedial -3 borders- anterior, medial, posterior -Associated with facial nerve (pes anserinus)
  • 10. Stenson’s duct: -35- 40mm long Runs forward across masseter muscle, turns inwards at the anterior border of masseter Runs through the 3Bs- Buccal pad of fat Buccopharyngeal fascia Buccinator Muscle - opens at a papilla opposite the second maxillary molar.
  • 11. Arterial supply-External carotid artery Venous drainage-External jugular vein Lymphatic drainage-Upper deep cervical lymph nodes.
  • 12. Nerve supply: Greater auricular and Auriculotemporal nerve Sympathetic- From the sympathetic plexus around the external carotid artery Parasympathetic
  • 13. SUBMANDIBULAR GLAND 10 to 15 gm. Size of a Walnut 65-70% of total saliva. Located at Posterior portion of floor of mouth, medial aspect of mandible & wrapping around posterior border of mylohyoid. 3 surfaces-Inferior, Medial, Lateral The post. Border of mylohyoid divides the gland: Superficial lobe : situated in the digastric triangle wedged between body of mandible and mylohyoid Small deep lobe: lying in the floor of the mouth between mylohyoid and the hyoglossus muscle on the lateral aspect of the tongue
  • 14. RELATIONS OF THE SUBMANDIBULAR GLAND
  • 15. SUBMANDIBULAR DUCT •Wharton's duct runs forward and opens into the mouth beneath the tongue, lateral to lingual frenum i.e sublingual caruncle. •40mm
  • 16. Blood supply: Facial and lingual arteries. Veins correspond to arteries, drain into internal Jugular Vein Lymphatic drainage: Submandibular lymph node & jugulodigastric nodes. Nerve supply: •Parasympathetic supply: Facial nerve reaching gland through the lingual nerve & submandibular ganglion. • Sympathetic Supply:Postganglionic fibers from plexus on facial artery
  • 17. SUBLINGUAL GLAND Smallest major salivary gland Weighs- 2gm. 2.5% of total saliva. Located at anterior part of floor of the mouth, just between mucosa & mylohyoid muscle. Saliva is poured into a series of small ducts (duct of Rivinus) and open through large duct- Bartholin’s duct, that opens with submandibular duct at the caruncula sublingualis. Essentials of Medical Physiology, Sembulingam 4th Edition
  • 18. Blood supply: Sublingual & submental arteries. Lymphatic drainage: Submental lymph nodes Nerve supply: Parasympathetic supply: Facial nerve reaching gland through the lingual nerve & submandibular ganglion. Sympathetic Supply: -Postganglionic fibers from plexus on facial artery.
  • 19. MINOR SALIVARY GLANDS Labial and buccal glands- Lips and cheek Glossopalatine- isthmus in glossopalatine fold  Palatine glands- lamina propria of the posterolateral region of hard palate submucosa of the soft palate and the uvula  Lingual– •Anteriorlingual GLANDS OF BLANDIN AND NUHN -apex of the tongue • Posterior Lingual (mucous)- lateral and posterior to the vallate papilla • Posterior lingual( serous) VON EBNER’S GLANDS- between the muscle fibers of the tongue below the vallate papilla.
  • 20. HISTOLOGY ACINI- TERMINAL SECRETORY UNIT. LEADING INTO DUCTS OPEN TO ORAL CAVITY AND SECRETION TO ANATOMIC LOCATION
  • 23.
  • 24. MYOEPITHELIAL CELLS BASKET CELLS . stellate or spider like cells flattened nucleus surrounded by - •small amount of perinuclear cytoplasm •long branching process that embracing the secretory duct cells.
  • 25.
  • 26. CONNECTIVE TISSUE •Same as connective tissue in other parts of body •Contain macrophages, plasma cells, fibroblasts, macrophages, mast cells •Extension of connective tissue into septa lobulates the gland
  • 27. serous salivary gland serous acini, zymogen granules intercalated ducts and striated ducts interlobular ducts with stratified epithelium. lobules with connective tissue septa. nearby lymph node with capsule. PAROTID GLAND HISTOLOGY
  • 28. .mixed salivary gland predominantly serous acini; some mucous acini with serous demilunes short intercalated ducts. striated ducts with simple cuboidal lining epithelium. interlobular ducts with stratified cuboidal or stratified columnar epithelium surrounded by connective tissue. PAROTID GLAND HISTOLOGYPAROTID GLAND HISTOLOGY SUBMANDIBULAR GLAND HISTOLOGY
  • 29. .mixed salivary gland predominantly mucous acini; some serous demilunes. acini are composed of centrally- located mucous cells and peripheral serous demilunes. short intercalated ducts. striated ducts with simple columnar lining epithelium interlobular ducts with stratified cuboidal/columnar epithelium, surrounded by connective tissue. SUBLINGUAL GLAND HISTOLOGY
  • 30.
  • 31. PHYSIOLOGICAL FACTORS AFFECTING SALIVATION TASTE OF EATABLES SURFACE OF OBJECT DEHYDRATIONAGE EMOTIONS AND PSYCHOLOGICAL EFFECTS INCREASED SALIVATION DECREASED SALIVATION Syllabus of Complete Dentures, Charles M. Heartwell and Arthur O. Rahn, 4th edtn
  • 32. PHASE OF SALIVATION • SMELLS • VIEW CEPHALIC • TASTE • TACTILE BUCCAL • IRRITATION GASTROINTESTINAL Syllabus of Complete Dentures, Charles M. Heartwell and Arthur O. Rahn, 4th edtn
  • 33. FORMATION OF SALIVA • TWO STAGE MODEL of saliva secretion Physiology, Robert M. Berne and Matthew N. Levy, 3rd edth
  • 34.
  • 35. NEURAL REGULATION OF SALIVARY SECRETION
  • 36. PATHOLOGIES OF SALIVARY GLANDS • ABERRANT GLANDS • APLASIA AND HYPERPLASIA • ATRESIA DEVELOPMENTAL DISORDERS • SIALOLITHIASIS • MUCOCELE • NECROTIZING SIALOMETAPLASIA OBSTRUCTIVE DISORDERS • BENIGN • MALIGNANT NEOPLASTIC DISORDERS • SJOGREN’S SYNDROME • RADIATION • XEROSTOMIA DEGENERATIVE CONDITIONS • VIRAL • BACTERIAL INFLAMMATORY DISORDERS Textbook of Oral Medicine, A.V.Ghom, 3rd edtn
  • 37. DEGENERATIVE CONDITION- SJOGREN’S SYNDROME • A.k.a Gougerot Sjogren’s Syndrome/ Sicca Syndome • It is an autoimmune disorder described as a triad of : -Keratoconjuctivitis sicca -Xerostomia -Rheumatoid arthritis Two types: -Primary -Secondary Keratocon junctivitis sicca Xerostomia Rheumat oid arthritis Sjogren’s syndrome
  • 38. Clinical freatures: •Dry mouth and dry eyes •Dry and fissured tongue •Primary sjogren’s syndrome are associated with parotid gland enlargment, purpura, lymphadenopathy. Treatment: 1. Ocular lubricants and salivary substitutes, 2. maintenance of oral hygiene 3. Frequent fluoride application, 4. sialogogues. Fig- DRY AND FISSURED TONGUE
  • 39. SALIVARY GLAND IMAGING MODALITIES 1. PLAIN FILM RADIOGRAPHY • OCCLUSAL VIEW • ORTHOPANTOGRAPH • LATERAL OBLIQUE • POSTERIOR ANTERIOR SKULL PROJECTION 2. SIALOGRAPHY 3. ULTRASONOGRAPHY 4. SCINTIGRAPHY 5. COMPUTED TOMOGRAPHY 6. MAGNETIC RESONANCE IMAGING Fig:- MANDIBULAR OCCLUAL VIEW OF A CALCIFIED STONE IN THE WHARTON’S DUCT
  • 41. SIALOGRAPHY • Retrograde injection of a iodinated contrast agent into the ductal system of a salivary gland. • Oldest imaging modality. • First sialogram performed by CARPY 1904 on an isolated parotid using mercury as a contrast agent. • Simple, quick and painless procedure AMAMENTARIUM Sialography catheters Lacrimal probes Iodinated contrast agent Cotton rolls Maxillofacial Imaging, Angelo. M DelBalso
  • 42. CONTRAST AGENTS INJECTION TECHNIQUES HYDROSTATIC INJECTION DISTENTION INJECTION HAND INJECTION FAT SOLUBLE • ETHIODOL • LIPIODOL • PANTOPAQUE WATER SOLUBLE • ANGIOGRAPHIC DYES • SINOGRAFIN
  • 43. PHASES OF SIALOGRAPHY DUCTAL PHASE ACINAR PHASE EVACUATION AND POST-EVACUATION PHASE Maxillofacial Imaging, Angelo. M DelBalso
  • 45. INTRODUCTION Saliva is a viscous, transparent liquid secreted by cells of the salivary glands. Salivary flow facilitates- 1. Speech 2. Mastication 3. Food Bolus Formation And Its Swallowing 4. General Oral Health And Function. It plays a critical role in retention of dentures due to its lubricating function and, thus, dry mucosa often leads to compromise in the retention of prosthesis.
  • 46. DEFINITION “Saliva is clean, tasteless, odourless, slightly acidic viscous fluid, consisting of secretions from the parotid, sublingual, submandibular salivary glands and the mucous glands of the oral cavity.” - Stedmans medical dictionary 26th edition • Saliva is a clear, alkaline, somewhat viscid secretion from the parotid, submandibular, sublingual & smaller mucous glands of the mouth. – Dorland Medical dictionary • Saliva is a complex fluid produced by the salivary glands , the most important function of which is to maintain the well being of the oral cavity . – Tencate’s Book of Oral Histology
  • 47. WHOLE / TOTAL SALIVA
  • 48. FLOW RATE(ML/MIN) WHOLE SALIVA PAROTID GLAND SALIVA SUBLINGUAL GLAND AND SUBMANDIBULAR GLAND SALIVA RESTING STATE 0.2-0.4 0.04 0.1 STIMULATED STATE 2.0-5.0 1.0-2.0 0.8 pH 6.7-7.4 6.0-7.8 6.0-7.4 Ten Cate’s Oral Histology, Development, Structure, and Function, Seventh Edition
  • 50. SOLID COMPOSITION OF SALIVA ORGANIC • SECRETORY PROTEINS: • ENZYMES  AMYLASE,RIBONUCLEASE,KALLIKREIN  ESTERASE,CYSTATIN,PEROXIDE  LYSOZYMES,LACTOFERRIN  ACID PHOSPHATASE  PROLINE RICH PROTEINS  GLYCOPROTIENS • IMMUNOGLOBULINS  IgG, IgM, IgA • BLOOD CLOTTING FACTORS • DESQUAMATED EPITHELIAL CELLS • MICROORGANISMS PRODUCTS • LEUKOCYTES • SERUM REMNANTS INORGANIC • ELECTROLYTES  SODIUM  POTASSIUM  CALCIUM  CHLORINE  BICARBONATE  PHOSPHATE  MAGNESIUM  SULPHATE  IRON  IODINE
  • 51. FUNCTIONS • LYSOZYMES+LACTOFERRIN+LACTOPEROXI DASE+IMMUNOGLOBULINS+CYSTATINS ANTI BACTERIAL • IMMUNOGLOBULINS+CHROMOGRAINSANTIFUNGAL • CYSTATINS+MUCINS+IMMUNOGLOBULIN S+SECRETORY LEUKOCYTE ANTI VIRAL BUFFER • BICARBONAT E PHOSPHATE PROTEINS PROTECTION AGAINST DEMINERALIZ ATION •MUCINS CALCIUM PHOSPHATE LUBRICATION GLYCOPROTEINS MUCINS REMINERALIZAT ION STATHERIN PHOSPHATE CALICUM
  • 52. Bolus formation MUCINS+WATER Taste of eatables GUSTIN+WATER Digestion of food AMYLASE+PROTEASE+LIPASE
  • 53. PROPERTIES • Total amount : 1,200 – 1500 ml in 24 hrs. A large proportion of this volume is secreted at meal time, when the secretory rate is highest. • Consistency : slightly cloudy, due to presence of cells and mucin. • pH : usually slightly acidic (ph 6.35 – 6.85) • Specific gravity : 1.002 – 1.012 • Freezing point : 0.07 – 0.340c.
  • 54. Total volume secreted 1200ml to 1500ml/day PAROTID GLAND SUBLINGUAL GLAND MINOR GLANDS SUBMANDIBULAR GLAND 20% 7- 8% <10% 65-70% Saliva composition and functions: A comprehensive Review, The Journal of Contemporary Dental Practice vol(9),no 3,2008
  • 55. FACTORS AFFECTING COMPOSITION OF SALIVA Time of the day Source of secretion Pathology Flow rate Differential gland contribution Circadian rhythm Nature of stimuli Diet and hydration David T. Wong Salivary Diagnostics, Wiley-Blackwell
  • 56. SALIVA: A DIAGNOSTIC TOOL SALIVA BACTERIA VIRUSES NEOPLASTIC CONDITIONS SYSTEMIC DISEASE BIOMARKERS DRUG ABUSE CONDITIONS David T. Wong Salivary Diagnostics, Wiley-Blackwell
  • 57. Salivary testing is becoming more common as clinicians have begun to appreciate its advantages & investigators defined its worth. Saliva proves to be a reflection of the body. SYSTEMIC DISEASES- • HEREDITARY DISEASES- CYSTIC FIBROSIS • AUTOIMMUNE DISEASES- SJOGREN’S SYNDROME • MALIGNANCIES- ADENOCARCINOMA, BREAST CARCINOMA, OVARIAN CANCER (MARKERS) VIRAL INFECTION MARKERS- • HIV • OTHER VIRAL DISEASES (due to immunoglobulins present in saliva) SALIVA AS A DIAGNOSTIC TOOL
  • 58. DRUG MONITORING- • THERAPEUTIC- Carbamazepine, Diazepam, Ethosuximide, Lithium, Tolbutamide, etc • RECREATIONAL- Nicotine, Cocaine, Barbiturates, Benzodiapines, Marijuana, etc MONITORING OF HORMONE LEVELS DIAGNOSIS OF ORAL CONDITIONS ASSOCIATED WITH DEEPER SYSTEMIC CONDITIONS
  • 59. • Forensic odontology- serological and cellular analysis of saliva aids in identification of accused -Saxena S, Kumar S. Saliva in forensic odontology: A comprehensive update. J Oral Maxillofac Pathol [serial online] 2015 [cited 2016 Apr 24];19:263-5. • Salivary pH assessment using telemetry: Device called telemetry system is incorporated in the denture which has a radiosensitive diode, oscillator, ph sensor, and a computer analyzer
  • 60. METHODS OF COLLECTION OF SALIVA • Draining method- funnel placed near lip and patient asked to expectorate saliva into the funnel to collect in a pre-weighed test tube • Spitting method- saliva allowed to accumulate in the floor of the mouth and then spat into a pre-weighed tube. For stimulated saliva patient is asked to chew on paraffin. • Suction method- saliva is aspirated into a pre-weighed container using a saliva ejector. • Absorbent method- preweighed swab, cotton roll, gauze sponge.
  • 61.
  • 62. • Adhesion • Cohesion • Surface Tension • Capillary Attraction • Atmospheric Pressure • Viscosity of Saliva 62 ROLE OF SALIVA IN COMPLETE DENTURE RETENTION
  • 63. Adhesion: It is achieved through ionic forces between charged salivary glycoproteins and surface epithelium or acrylic resin. According to Bernard Levin– the most adhesive saliva is thin but containing some mucous component Cohesion: It is a retentive force because it occurs within the layer of fluid (saliva) that is present between the denture base and the mucosa and works to maintain the integrity of the interposed fluid.
  • 64. Interfacial force/ Surface tension • It is the resistance to separation of two parallel surfaces that is imparted by a film of liquid between them. • It is dependent on the ability of the fluid to ‘ wet’ the rigid surrounding material (WETTABILITY). Capillary Action • Capillarity is what causes a liquid to rise in capillary tube • • When adaptation of denture base to mucosa on which it rests is sufficiently close, the space filled with thin film of saliva acts like capillary tube in that liquid ,seeks to increase contact with both denture and mucosal surface.
  • 65. Atmospheric pressure •The cohesive forces result in the formation of a concave meniscus at the surface of the saliva in the border region of the denture. •When a fluid film is bounded by a concave meniscus the pressure within the fluid is less than that of the surrounding medium; •Thus a pressure differential will exist between saliva film and air and thereby aids in the retention of the denture
  • 66. XEROSTOMIA AND HYPERSALIVATION XEROSTOMIA • Dry mouth/ pasties/ cotton mouth • Hyposalivation or Aptyalism Causes- • Dehydration or Renal Failure • Sjogren’s Syndrome • Radiotherapy • Trauma to Salivary gland or duct • Drugs • Smoking of marijuana/cannabis • Shock HYPERSALIVATION • Excess saliva secretion • Physiological- Pregnancy • Pathological is called Ptyalism, Sialorrhea, Sialosis Causes- • Decay of tooth or a neoplasm • Disease of foregut, stomach or intestine • Cerebral Palsy • Parkinsonism DID YOU KNOW? In ancient China, a suspect would be made to chew dry rice while being questioned. When the suspect spat out the rice, they were assumed to be guilty if the grains remained stuck to their tongue. The reason was that the stress caused slow saliva flow and induced a dry mouth (activation of the sympathetic nervous system).
  • 67. PROSTHODONTIC MANAGEMENT OF PATIENT WITH XEROSTOMIA In dry environment, fixed non tissue bearing prosthesis are preferred where indicated FPDs should have full coverage retainers and easily cleaned pontics and connectors Margins of retainers should be supragingival Health of residual teeth and periodontal tissues Use of gingivally approching clasp avoided Tooth supported denture with minimal tissue coverage Metal denture bases are preferred FIXED PARTIAL DENTURE PROSTHESIS REMOVABLE PARTIAL DENTURE PROSTHESIS
  • 68. Procedures -aim at optimizing retention and stability Use dentures with metal bases Use of soft liners to improve comfort Use of denture adhesives to augment retention Frequent recall – As more prone to candidal infections COMPLETE DENTURE PROSTHESIS TREATMENT OPTIONS •Use of sialogogues •Saliva reservoirs •Flexible dentures
  • 70. Pattanaik B, Pattanaik S. Prosthetic rehabilitation of a xerostomia patient with a mandibular split salivary reservoir denture. Annals and Essences of dentistry 2010;3:32–5 SPLIT DENTURES
  • 71. Mendoza AR, Tomlinson MJ. The split denture: a new technique for artificial saliva reservoirs in mandibular dentures. Aust Dent J 2003;48:190–4
  • 72. Flexible dentures Saliva substitutes are contraindicated in • asthma • iritis • Glaucoma limitations of the split dentures • Require adequate vertical dimension • Structure weakened • repair and relining are difficult • Too bulky Flexible dentures- • Long lasting • do not warp or become brittle • exhibit better accuracy • softer material locks into the undercuts of the ridges thereby adapting to the constant movement • Can retain a small percentage of water- more compatibility and softer than acrylic
  • 73. • Dental restorations are affected by saliva. They have ability to dissolve silicates. • Changes physical properties of various impression materials. • Causes electro-galvanisation between silver and gold discolors the restoration, causes pain. • Hampers clinicians view and contaminates working area. ISOLATION:
  • 74. METHODS OF FLUID CONTROL SALIVA EJECTORS RUBBER DAM SVEDOPTER ANTI-SIALOGOGUES RETRACTION CORDS GAUZE AND COTTON ROLLS
  • 75. IMPLANTS • Failure of Implants is seen due to microbiota present in saliva. • Bacterial species from human saliva may penetrate along the implant-abutment interface
  • 76. • Essentials of Human Anatomy- Head and Neck, 4th Edition- A K Datta • Orbans Oral Histology & Embryology, 14th Edition • David T. Wong Salivary Diagnostics, Wiley-Blackwell • Ten Cate’s Oral Histology, Development, Structure, and Function, Seventh Edition • Oral Radiology Principles And Interpretation Sixth Edition,Stuart C. White and Michael J. Pharoah • Textbook of Oral Medicine, A.V.Ghom, Third Edition • Physiology, Robert M. Berne and Matthew N. Levy, Third Edition • Syllabus of Complete Dentures, Charles M. Heartwell and Arthur O. Rahn, Fourth Edition • A contemporary review of the factors involved in complete denture retention, stability, and support. Part I: retention. Jacobson TE, Krol AJ. J Prosthet Dent. 1983 Jan;49(1):5-15. REFERENCES
  • 77. •Essentials Of Medical Physiology K. Sembulingam 4th Edition •Syllabus of Complete Dentures, Charles M. Heartwell and Arthur O. Rahn, 4th edtn • Ten Cate’s Oral Histology, Development, Structure, and Function, Seventh Edition •Mendoza AR, Tomlinson MJ. The split denture: a new technique for artificial saliva reservoirs in mandibular dentures. Aust Dent J 2003;48:190–4 •Pattanaik B, Pattanaik S. Prosthetic rehabilitation of a xerostomia patient with a mandibular split salivary reservoir denture. Annals and Essences of dentistry 2010;3:32–5 •Saliva composition and functions: A comprehensive Review, The Journal of Contemporary Dental Practice vol(9),no 3,2008 •Kaufman E, Lamster IB. The diagnostic applications of saliva--a review. Crit Rev Oral Biol Med. 2002;13(2):197-212.