
 curing type  acetoxycolor  tranlucentdensity  approximately 1.04 g / ccskin formation time  approximately 5 min at 30ccuring time  approximately 24 h. for 2 mm thickness at 30cmovement accommodation 
 approximately 0.61 n / mmelasticity  approximately 260% 
  curing type  acetoxy density  approximately 1.04 g / cc skin formation time  approximately 5 min at 30c curing time  approximately 24 h. for 2 mm thickness at 30c movement accommodation  approximately 15% tensile strength 
step 1 : ear impression is made using irreversible hydrocolloid alginate and custom made wax rim .
wet gauze pieces are layered on top of alginate for the interlocking of the plaster to be poured [ figure 1 ] .
making of ear impression step 2 : undercut areas in the impression are identified and blocked out with wax .
block out impression partly with wax and cast poured step 3 : working model is retrieved from the impression carefully and base trimmed [ figure 3 ] . working model with dental stone prepared step 4 : custom tray using soft tray sheets prepared .
a complete ear cast is made by making alginate impression for a person related to the patient [ figure 4 ] .
custom tray using soft tray sheets prepared for complete ear cast step 5 : skin tone of the patient is matched to the oil colors .
colors mixed with silicone step 6 : silicone material is dispensed to the under cuts of the custom tray and filled completely [ figure 6 ] .
material dispensed with syringe into soft sheet custom tray step 7 : separating medium is applied on working cast and under cuts are filled with silicone material .
it is pressed against the soft sheet custom tray carrying the silicone material [ figure 7 ] .
silicone filled tray pressed against working cast step 8 : prosthesis is tried on the model and trimmed before insertion on patient [ figure 8 ] .
over a period of time various materials such as wood , leather , polyurethane and polyvinyl chloride have been used to produce esthetic properties to prosthesis , but silicone has proved to be the material of choice because of its lifelike effects and flexibility .
methyl methacrylate resin is been used as a maxillo - facial material , but its use is limited due to its rigidity . the flexibility and staining of silicone
this industrial silicone has the property of elasticity and has the potential to incorporate stains and colors to mimic natural skin .
the advantage of this industrial silicone material is the low cost factor , soft nature , flexibility , easy to fabricate and having good esthetic property and it will be an ideal material for the post - graduate student to train himself and acquire skills during his pre - clinical training program , which includes maxilla facial prosthodontics . since the cost is not prohibitive and as this material is quite similar to the current silicones , it can be recommended .
 this article describes an industrial elastic silicone as a material for the laboratory fabrication of ear prosthesis . 
 it has been tested for toxicity in lab animals by the sgs india pvt . 
 ltd and approved as a material to pass the parameter of abnormal toxicity . 
 this material therefore can be safely recommended for laboratory exercise to fabricate facial prosthesis . 
 the high cost of the maxillo facial silicone materials prohibits their use for facial prosthesis in pre - clinical training of post - graduate students in maxillofacial prosthodontics . for this reason , 
 pre - clinical laboratory exercise in facial prosthesis is inadequate . 
 a few institutions use polymethyl methacrylate resins which are rigid and do not have elastic characteristics of silicone , which is used for facial defects . 
 this cost - effective industrial silicone material which mimics the elastic and color characteristics of the conventional silicones can be recommended for preclinical exercises . 
Material description
Fabrication of Ear Prosthesis
Discussion
Conclusion