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Dental Group (teeth)

ORAL PHYSIOLOGY & OCCLUSION

Group of Structures that Comprises the Stomatognathic System.

  • Osseus group (bones)
  • Receptor Group (receptor cells; nerves, senses)

At about 27 days this membrane raptures and the stomodeum establishes a connection with the foregut (future digestive tract)

At 6 weeks old, the first sign of tooth development is seen

ORAL STOMODEUM

The oral ectoderm will give rise to the oral epithelium that runs along the outline of the future dental arches, which is called the Dental Lamina (invagination that forms 2 thicker bands; Vestibular Lamina and Dental Lamina

dental lamina

ORAL PHYSIOLOGY & OCCLUSION

is a system composed of several parts capable of acting as a single unit for the process of acting as a single unit for the process of:

Mastication (major function)

Deglutition (swallowing)

Phonation (sound)

Respiration (breathing)

Other behavioral characteristics/activities

Stomatognathic System

Oral Stomodeum is the primitive oral cavity that begins to develop at 3 ½ weeks of fetal life

It is lined with an ectoderm and unites with the endoderm to form the buccopharyngeal membrane

is a system that comprises of a highly coordinated structures comprising the human masticatory apparatus (oral cavity)

Development of The Oral Cavity

Physiology

A science which deals with the study of normal tissue function of a normal living body

Simultaneous with the differentiation of the Dental Lamina, there arises round or ovoid swellings at 10 different points in each jaw, corresponding to the future position of the deciduous dentition (Tooth Buds)

Cheeks

Forms the lateral boundary of the vestibule of the mouth

Buccinator muscle - is the major muscle that makes up the cheek

Composed of the following:

  • Skin
  • Superficial fascia
  • Buccopharyngeal fascia
  • Buccinator muscle
  • Submucous layer
  • Mucous membrane

Blood Supply

  • Superior labial artery
  • Inferior labial artery

Nerve Supply

Infra-orbital nerve - from the maxillary nerve and supplies the upper lip

Mental nerve - from mandibular nerve and supplies lower lip

  • Muscular Group (muscles)
  • Salivary Glands
  • Organs of the Digestive System (digestion starts from the mouth)
  • Organs of the Respiratory System

Oral Cavity Proper

Larger, inner portion

Boundaries

Anterolaterally - alveolar arches with their teeth

Superiorly - hard and soft palate

Inferiorly - tongue and mucous membrane from the side of the tongue to the gums

Dental lamina

Composed of the following layers:

  • Skin
  • Superficial fascia
  • Orbicularis oris muscle
  • Submucous layer
  • Mucous membrane

Frenulum of the upper and lower lips - vertical mucous folds found on the internal surface of the lips connecting them to the gums

tooth bud

lips

Divisions of the Oral Cavity

Vestibule

Smaller, outer portion

Boundaries

Anterolaterally - lips and cheeks

Posteromedially - gums and teeth

Superior and inferiorly - mucous membrane from the lips and cheeks to the gums

Parts:

  • Angle of the mouth - points where the upper and lower lips meet at the sides
  • Naso-labial groove - from the side of the nose to the angle of the mouth
  • Mentolabial groove - between chin and lower lip
  • Philtrum - from the inferior border of the nose to the upper lip

Parts of Oral Cavity

Enamel Organ (Enamel)

Dental Papilla (Dentin & Pup)

Dental Sac (Cementum Periodontal Ligament, Alveolar Bone)

General Physiology

Two mobile folds that encircle the rima oris (mouth)

-Rima/orbicularis oris - sphincter muscle of the mouth

-Covered by skin on its external surface and mucous membrane on its internal surface

ORAL CAVITY

-is the first portion of the alimentary canal or digestive tract

Boundaries

  • Anteriorly – lips
  • Laterally – cheeks
  • Superiorly - hard and soft palate
  • Inferiorly - floor of the mouth and tongue

-is the study of the basic activities of living organisms as a whole emphasizing on function and dynamic changes

-occurs within cells, tissues and blood vessels

Oral Physiology

Thank You

Definition of Terms

A branch of General Physiology which focuses on the function of the different parts in the oral cavity as well as its associated structures. It deals with the masticatory apparatus (all structures and organs involved in mastication)

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