The influence of the impression tray on the accuracy of impressions for crown and bridge work--an investigation and review

Abstract

Metal and rigid plastic stock trays give greater accuracy in the putty/wash silicone twin mix impression technique compared with flexible plastic ones for crown and bridge work. Those using the latter should be aware of their shortcoming in this respect.

Comparative study of Dimensional stability and accuracy of various elastomaric materials

“…Both the techniques were found to be accurate and not significantly different from each other 22 . In most of the studies reported in literature so far, precision measurement was done using instruments such as travelling microscope, 23,16 micrometer, 24 vernier caliper, 25 and laser probes. In the present study, a travelling microscope (ELFO, INDIA) was used.…”

How to make a good impression (crown and bridge)

“…Selection of a metal or rigid tray allows for greater accuracy. 2 What typically happens (see Fig. la,b) is the putty tends to push the light body wash off the prepared tooth.…”

Crowns and other extra-coronal restorations: Impression materials and technique

“…[13][14][15] Rigid metal trays however can minimise such distortions and are to be recommended for putty-wash impressions.…”