Dr. Navneet Sharma, Dr. Sanjeev Mittal


AIM: This study aims to evaluate the definiteness of the casts made by making impressions with different impression materials in two types of
double arch trays.
MATERIALS AND METHOD: A total of 60 impressions obtained were grouped into three classes according to impression material studied with
two type of trays used i.e. Class A, class B & class C consisted of impressions obtained from heavy+ light body (n=20), putty + light body (n=20)
and Polyether respectively. Class A, B and C were further divided into Subclass I and II depending upon the metal (n=10) and plastic (n=10) dualarch
trays used. The measurements were obtained using digital microscope and statistical analysis was done for interpretation of results.
RESULTS: All the three classes when compared to the master model showed decreased inter- abutment distance (p> 0.05) The statistical
analysis showed that PVS heavy- light body, & polyether loaded dual arch metal tray are more accurate than plastic tray. Anova shows interabutment
distance with plastic dual arch tray within different impression material found to be statistically significant (p<0.05) whereas in relation
to metal dual arch tray it was found to be statistically insignificant (p> 0.05).
CONCLUSION- For measuring the inter-abutment distance, If metal tray is to used, polyether is found to be more accurate, and if plastic tray is
used, PVS putty-light body is more accurate, whereas PVS (heavy-light body) loaded in a plastic dual arch tray should not be used as it is found
to be least accurate.


Metal dual arch trays, Plastic dual arch trays, elastomeric impression materials, inter-abutment distance.

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