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Comparison of the dimensional accuracy of one- and two-step techniques with the use of putty/wash addition silicone impression materials

https://doi.org/10.1016/S0022-3913(05)80358-0Get rights and content

This study compared the putty/wash one-step and two-step techniques for making addition silicone impressions. For each technique 15 impressions were made of a stainless steel base to which three tapered posts were attached. Stone models were made of all impressions. The results indicated that the interabutment distances increased slightly compared with the stainless steel model for both techniques, but the differences between techniques were not considered to be clinically important. The intraabutment measurements for the abutment without undercut increased, whereas abutments with undercuts decreased. These variations from the stainless steel model were also clinically insignificant.

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Cited by (58)

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    Patient data were collected over 2 appointments. First, conventional polyvinyl siloxane impressions were made of both dental arches with a 2-step putty-wash technique (Aquasil Ultra DECA Heavy, Aquasil Ultra LV; Dentsply Sirona).23-26 Two pairs of casts were prepared per patient.

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    2015, Journal of Prosthetic Dentistry
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    The putty in the 2-phase, 1-step impression technique also tends to push the light-body impression material off the prepared tooth, and critical areas, such as the finish line, can be covered by the putty, which cannot record details satisfactorily.10 A further disadvantage has been reported for the 2-phase, 2-step impression technique, whereby some light-body impression material can spread along the occlusal surface during the reseating of the putty, or it can displace the preliminary putty impression during the seating; this can generate distortions that reduce dimensional accuracy.11 The data from the present study confirmed the improved results of the 2-phase, 2-step impression technique compared with those with a 1-step procedure.

  • Experimental study on the use of spacer foils in two-step putty and wash impression procedures using silicone impression materials

    2015, Journal of Prosthetic Dentistry
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    When the spacer foil technique is used, the flexible foil deforms and creates a void between teeth and impression material during the primary impression. This allows for drainage and lower pressures on the first impression material during the definitive impression.16,17 Thus, less compensative elastic recovery of the impression material upon removal can be expected.

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