Development of rubber base impression materials polysulphides and condensation silicones 1960s.
Rubber base impression material slideshare.
Material can be reused several times.
Difficult to record.
Impression material any substance or combination of substances used for making an impression or negative reproduction.
Elastic impression materials 1.
A device that is used to carry confine and control impression material while.
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An impression material sustains some deformation as it is removed from the mouth but it must rebound to its pre removal dimensions.
An impression with a sufficiently high elastic limit should not sustain permanent deformation.
Till now the elastomeric impression materials are divided into 3 types based on the material used.
These are basically synthetic rubber based materials which were initially called as rubber impression materials but currently they are known as non aqueous elastomeric impression materials.
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Impression materials a brief introduction dr saransh malot 2.
Impression materials elastic chemical reactions irreversible alginate elastomers polysulphides polyethers condensation silicon addition silicon temperature change reversible agar hydrocolloid chemical reactions irreversible plaster of paris zno eugenol temperature change reversible impression compound.
Polyether impression material developed in germany 1970s.
Impression a dental impression is a negative record of the tissues of the mouth.
It is used to register or reproduce the form and relationship of teeth and surrounding tissues.
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Dean marquette university school of dentistry.
Classification of elastomeric impression materials.
Difficult to remove if there are undercuts.
Addition silicone was introduced as a dental impression material 1988.
Distortion due to poor dimensional stability.
Read before the academy of denture prosthetics columbus ohio may 3 1957.
Direct inhibition direct contact with latex gloves impression are made with rubber dam in place mechanism of inhibition element sulphur react with chloroplatinic acid catalyst present in pvs impression material.
Following these elastic polyether impression materials were introduced followed in recent times by polyvinylsiloxane impression materials.
The introduction of rubber based polysulfide impression materials was followed by silicone based materials both of which are still in use.
Accuracy can be improved by flaming surface material disadvantages.
The elastic properties of these elastomeric impression materials improve with an increase in curing time in the mouth.
Inaccurate portions can be remade without having to remakethe entire impression.
Latest addition and light cure elastomers 1990 2000.
