modified acrylics dental material

1. Artificial Denture
Teeth
Artificially-made replacements for either
anterior or posterior teeth' crowns.
These replacements are usually retained to
and supported by denture bases that replace
the lost natural soft tissues.

2. Requirements of artificial teeth
 Constructed of non-toxic, non-irritant and odorless materials.
 Resemble the surrounding natural teeth in their shape, color and
translucency.
 Have high mechanical properties to resist the effect of masticatory
forces.
 Made of resilient material to minimize the stress transferred to the
underlying tissues.
 Have high wear resistance (high surface hardness)
 Permit easy adjustment with dental burs or finishing stones.
 Adhere to the denture base materials (i.e. provide chemical
attachment with the denture base).
 Own coefficients of thermal expansion matching to that of the
denture base material.
 Have low density to minimize the weight of the dentures especially
the upper one.

3. Types of
Artificial Teeth
1. Metallic 2. Acrylic 3. Porcelain
Made of acrylic with;
1. White color
2. Low mol. wt
3. Low plasticizer
contentUsed only in certain
cases of RPD
4. Composite
Teeth

4. porcelain teethAcrylic teethDifferences
mechanically retainedchemically retainedretention to acrylic
denture bases
High density (heavy in wt.)Low density (light in wt.)Density (weight)
- Not resilient
- Could transmit the force causing
alveolar bone resorption and soft
tissue injury.
- Should not be used in case of
diabetic patient
- Resilient
- Preserve the alveolar bone and soft
tissue.
- Could be used in case of diabetic
patient.
Resiliency
produce noisy during eatingQuiteNoisy
highLowWear resistance
highLowColor stability
Difficult to be stainedEasy to be stainedStaining
Can not be grind easily and difficult to be
glazed
Can be adjusted, grind and repolishedAdjustment and
grinding
low (porcelain is brittle)highImpact strength
Different from that of acrylic denture
base
Similar to that of acrylic denture baseCoefficient of thermal
expansion
brittle and can not be used in cases of
closed bite
Strong, enough to be used in cases of
closed bite
Strength in thin section
Differences among acrylic and porcelain teeth

5. Thank you