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By Prof.Dr/Mona Hussein. The science of dental biomaterials involves the study of the composition...
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Transcript of By Prof.Dr/Mona Hussein. The science of dental biomaterials involves the study of the composition...
![Page 1: By Prof.Dr/Mona Hussein. The science of dental biomaterials involves the study of the composition and properties of materials and the way in which they.](https://reader035.fdocuments.us/reader035/viewer/2022070413/5697bfb61a28abf838c9e199/html5/thumbnails/1.jpg)
By
Prof.Dr/Mona Hussein
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The science of dental biomaterials
involves the study of the composition
and properties of materials and the way
in which they interact with the oral
environment in which they are placed.
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Dental biomaterials may be classified
according to nature into, ceramics,
metals, polymers and composites or
according to use into restorative and
auxiliary materials
WHAT is the THIRD CLASSIFICATION?
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I- Metals
Metals are used for making restorations of the
lost tooth structure, prosthetic devices,
orthodontic appliances, and many other
applications where strength and elasticity are
required.
A mixture of two or more metallic elements is
called alloy (Gold alloy &Cobalt chromium alloy)
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Metallic restoration
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II- Ceramics
Ceramics include a wide variety of
substances such as glass, cement,
refractory (high temp), and many
other materials.
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Types of dental ceramics:
Dental porcelain.
Dental cements.
Gypsum products.
Casting investment
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Ceramic restoration
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Ceramo-metal system
Bridge
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III- Polymers
Polymers are synthetic resins.
Types of dental polymers:
Polymeric impression materials.
Denture base materials.
Tooth colored restorative materials.
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Polymeric denture base
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Esthetic restoration (dental composite)
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1-Enamel.2-Dentine.3-Gingiva (Gum).4-Gingival Sulcus.5-Periodontal Ligaments.6-Pulp Chamber.7-Root Canal.8-Apical Foramen.9-Bone.10-Cementum.
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1. Enamel:
Is the hardest structure in the human
body.
It forms the outer layer of the crown
It’s the only visible portion of the
crown.
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2. Dentine:
Is the main substance of the
crown & the root.
Is yellowish-white in color.
Is sensitive.
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SalivaContents:
1- Water.
2- Electrolytes.
3- Mucus.
4- Enzymes.
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Functions:
1. Helps in creating the bolus of the food.
2. Amylase enzyme that converts starch into
dextrin.
3. Prevent tooth decay& tooth erosion due to
its buffering properties.
4. Saliva carries ions as calcium,fluoride….
That helps in remineralization.
5. Antibacterial.
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The restorative material present in the
oral environment is subjected to:
1. Changes in temperature.(Thermal
properties)
2. Variation in pH.(Corrosion)
3. Occlusal stresses.
4. Solubility and disintegration.
5. Change in color(Optical properties)
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Tempromandibular Joint
Functions:
1. The first function is rotation around a
horizontal axis.
2. The second function is translation
where the condyle & the disc move
together anteriorly beneath the
articular eminence.
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DENTAL BIOMATERIALS
I -Basic science of biomaterials
• Physical properties
Thermal properties
Optical properties
Surface chemistry
Corrosion
• Mechanical properties
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• Basic structure of metals. • Basic structure of polymers.
• Basic structure of ceramics.
II APPLIED BIOMATERIALS
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