” DOUBLE STEP REVERSE ” ( DSR ): A NEW PROTOCOL IN POLYVINYLSILOXANES ( PVS ) IMPRESSION- TAKING PROCESS - TWO CASE REPORTS
Figure 3 . Dies made from an Ultimate impression ( U ) and from Aquasil XLV + monophase ( A )
Figure 4 . The duralay post ready to be transformed in a “ Bio-HPP ” post
Figure 5 . Endorsal x-rays that shows the space between posts and dies ( Left : DRS impression , Right : traditional impression )
Reverse ), requires the operator to place the intrasulcular tip straight into the sulcus for a direct material “ wash ” placement and leave the material wash to fully set . Exploiting the power of airpressure , the clinician is able to precisely place the wash material over the margins in a single step without having to retract the tissues with any retraction cord or astringent paste . Once set , the wash material is ready to be taken away from the mouth , by inserting an impression tray ( with a “ tray material ”) and positioning in patient ’ s mouth , over the wash material . After the recommended setting time ( 3 minutes ), the operator removes the tray and performs a visual inspection . The hypothesis of this work is the clinical verification of the results obtained by applying either the new DSR technique and the well-known protocol 3-6 , 8-9 . Putty-wash 1-step that instead recommends to place the wash material ( type 3 ) on the preparations then the heavy-viscosity or monophase material ( type 1 - 2 ).
2 . Cases Reports 2.1 . Case Report n ° 1 Tooth # 13 shows a very old ceramic crown with a considerable misfit , which hides a damaged and aged core structure so that it requires a thorough
186 STOMA . EDUJ ( 2016 ) 3 ( 2 )