Lectures teeth and teeth sets

2021-02-02 12:00 AM

The marrow has two jobs: creating dentin and receiving sensations through the nerves with the ends close to the marrow wall or entering the ivory ducts.

The basic concepts

Chewing system

Includes teeth, periodontal, jaw bone, temporal joints, chewing muscles, nerves, blood vessels, salivary gland system, lip-cheek-tongue system.

Tooth organs

Is a structural and functional unit of the teeth, including teeth and periodontal:

Teeth are the main parts, directly chewing and crushing food.

Periodontal is the part that supports and holds teeth in place, directly influenced by the force of chewing.

Teeth set is an organized arrangement of the tooth organs.

Biological structure of tooth tissue

Tooth tissue consists of hard tissue (enamel, dentin) and soft tissue (pulp).

Enamel

Is a highly calcified tissue.

Ingredients include (by weight):

95% inorganic (Calcium, Phosphorus, Magnésium, CO3, Na, F, Ca-P).

1% organic (Protein and Lipids).

4% of water.

Enamel is formed and formed before teeth erupt.

After teething (in about 2 to 3 years) in the enamel life takes place the maturation process, mainly the formation of complexes due to metabolism with saliva environment makes crystals ( Hydroxyapatite and Fluoroapatite) are the units that makeup enamel pillars, there is a change in the enamel that is formed when it has not yet grown or erupted.

The reaction of the enamel in the life of the tooth is characterized by a highly calcified material.

Tusks

Also a highly calcified tissue but less than tooth enamel.

Composed of 70% inorganic matter, 20% organic matter and 10% water.

In the tusks there are many small tubes containing protozoan tails of the dentin formations, the ivory tube has a diameter of about 5-10 (1 plate = 10 –6 m, 1 nm = 10 –9 m).

Over 1mm2 cut across the dentin has about 20,000 to 50,000 dentin tubes, such dentin is a relatively spongy and elastic tissue.

Pulp

It is a connective tissue that is particularly rich in blood vessels and nerves.

There is a special type of cell, the odontoblasts, which are lined up close to the medullary wall.

The odontoblasts continuously produce tusks (secondary dentin), causing the cavity of the pulp to narrow.

The marrow has two jobs: creating dentin and receiving sensations through the nerves with the ends close to the marrow wall or entering the ivory ducts.

The feeling of the teeth through the pulp system is very special because:

No site-specific.

Not specific about the cause of the sensation.

Due to being in the closed chamber and due to the structure of the vascular system, the pulp is both susceptible to inflammation and easily necrotic due to that inflammatory reaction.

When inflammation causes severe pain.

The biological structure of the periodontal tissue

Periodontal tissue includes cementus, periodontal ligament, gums and alveolar bone.

Tooth root cement

A special bone-type tissue (61% inorganic matter, 27% organic matter rich in collagen fibres, and 12% water) adheres to the dentin and is often removed with teeth when extracted.

Gasoline is created throughout the life (thanks to the regular activity of cementoblast-forming platelets), especially at the tip of the teeth, making the teeth continuously sprout to compensate for the wear in the chewing surface.

Periodontal ligament

Is a connective tissue rich in fibroblasts and fibrous cells with many blood vessels and nerves.

These are special connective fibres connecting the cément to the alveolar bone.

The ligament is about ¼ mm thick.

Function :

Shock reduction (normal R has a certain wobble).

Transfer the chewing force down the alveolar bone.

Raise cement layer and alveolar bone.

Create a sense of positioning and touch.

Gums

The gum mucosa is continuous with the oral mucosa.

Consists of sticky gums (which are attached to the outer surface of the alveolar bone) and loose gums.

On the crown of loose gums, there is a special epithelial region called the adhesion epithelium, which is where the gum epithelium attaches to tooth enamel.

The gum epithelium is kératinized on the outer surface, not keratinized on the inside.

Alveolar bone

Is a part of the upper or lower jaw bone, supporting teeth.

It is a continuous spongy bone tissue with the jawbone and forms acupuncture points similar to the shape and number of the roots.

There is a thin, hard bony wall surrounding the root and is where the periodontal ligaments (lamina dura) attach.

If the tooth is extracted, the alveolar bone will gradually dissipate.

In life, the teeth need for the first tense to mechanically cut and crush food, but the oral and chewing system, in general, do not contribute to survival decisions but are still the first part of the body. contact, communicate with the outside world, between individuals and individuals, between individuals and others in the community (social functions).

Maintaining the healthy and comfortable chewing system is the goal of the physician as well as a requirement of each individual and the community.