[Comparasion of clinical and technical operating time of full-crown restorations between traditional and Triple-tray impression techniques].

OBJECTIVE

To compare the difference of clinical and technical processes of full-crown restorations by using traditional and Triple-tray impression techniques, consumed materials and time estimated in every procedure of these two methods.

METHODS

Four veteran clinicians were selected to carry out full-crown restorative treatment for 124 patients (130 crowns). From one impression, dentists could make casts of prepared teeth and the opposing dentition and register the interocclusal relationship.After tooth preparation,Impregum Penta polyether impression was fabricated for 76 cases(80 crowns) by Triple-tray method and 48 cases (50 crowns)by conventional method. During the whole processes, the consumption of impression materials and plaster, the time of fitting on the articulator, manufacturing procedure and try-in in clinical practice were recorded. The differences of material and time consumption in every procedure of these two methods were evaluated by Independent-Samples t test.

RESULTS

The consumption of impression materials and plaster of Triple-tray impression technique was significantly less than that of traditional impression technique(P<0.01), and average time in every procedure of Triple-tray impression technique was remarkablely reduced compared with that of the traditional impression technique (P<0.01). Triple-tray impression technique reduces operating costs and the possibility of error.

CONCLUSION

Compared with traditional impression technique, Triple-tray impression technique could reduce the consumption of time and materials in clinical and technical processes.