In this study, the author want to find out the whether there is a dimensional accuracy difference among one step conventional putty-wash impression technique
, one step modification, two step without spacer and two step with spacer polyethylene in working model fabrication.
Therefore, the digital impression technique
was developed to address this need by increasing the accuracy of the definitive FDP while simplifying the process (26).
TABLE 3: COMPARISON OF RETENTION EVALUATION BY THREE OPERATORS OF DENTURE BASES CONSTRUCTED THROUGH CLOSED MOUTH IMPRESSION TECHNIQUE
Dual arch impression technique
: In this study dual mix technique was followed, where both syringe material (Light bodied addition silicon, Express[TM], 3M ESPE) and the tray material (Regular body, Imprint[TM], II Garant[TM], 3M ESPE and Penta Putty, Express[TM], 3M ESPE) were automixed simultaneously.
In altered cast impression technique
an individual custom tray is fabricated on the metal framework to make a second impression of the edentulous tissues.
Effect of contaminants on the adhesion of light-bodies silicones to putty silicones in putty-wash impression technique
. J Prosthet Dent 1988; 59(5): 562-67
Recent studies have indicated that the digital impression technique
was more comfortable and faster than the current impression technique
Mucostatic impression technique
(1938) records denture-bearing tissues in static, undisturbed form by using readily flowing material such as impression plaster.
Alginate impressions of the maxillary and mandibular jaws were taken and a custom impression tray fabricated for use with the abutment-level impression technique
. At the subsequent visit, two solid abutments were attached to the implants using abutment driver with final tightening of 35 Ncm.
Thus, the success depends on the use of a proper impression technique
, apart from the maxillofacial prosthetic skill and artistry .
In the future, in-office CAD-CAM scanning and milling of restorations, or digital scanning of tooth preparations, followed by E-mailing the scans to a dental laboratory, may reduce the frequency of use of the manual triple tray impression technique
. However, its intrinsic efficiency may prevent it from becoming obsolete.
An impression of the control group was utilized to prepare five individual trays for each impression technique
using chemically-activated acrylic resin (Reliance Dental Mfg.