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Article Type

Original Article

Section/Category

Restorative Dentistry

Abstract

Objective: To compare the accuracy between complete denture impressions made on digitally constructed and conventionally constructed custom trays with two impression materials.

Materials and Methods: Eight completely edentulous patients were selected; intra oral scanning was done for all patients to record digital impression and saved in standard tessellation language. The scanned data was imported to 3D printer to fabricate digital cast and was imported to custom tray design software to design the special tray. The printed cast was duplicated to fabricate a visible light cured acrylic resin tray. All patients received 8 trays (4 for each arch). Two impression materials were used for this study (zinc oxide eugenol free and silicone impression). The digital and the conventional trays were used to take impressions with the two impression materials. All impressions were boxed and poured to produce casts. All casts were scanned digitally and data acquisition to compare with the digital cast from intra oral scanner. Evaluation of the accuracy was measured and recorded using Geomagic software program. The main statistical test was Mann-Whitney U-test (P ≤.05).

Results: Higher accuracy for digital tray compared to conventional tray for medium body rubber base impression material (P=.045). A slightly higher accuracy for zinc oxide impression material compared to medium body rubber base in both conventional and digital trays but without statistical significance (P= .291 for conventional and .410 for digital tray)

Conclusions: Rubber base impression material is better used with digitally constructed custom tray, also when using intra oral scanner for primary impression, it is better to construct digital special tray than conventional one.

Keywords

Complete denture; impression; conventional; digital; and Data acquisition

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