النموذج الإفرادي : ما بين التقنيات التقميدية و الرقمية : دراسة مخبرية مقارنة

الملخص EN

There are currently many materials that can be used in the manufacture of Models and Dies which are satisfactory in terms of possessing the desired features with some bad properties for each.

In order to overcome these bad properties and get accurate work Models and Dies without distortions, we must have a precise impression material and use materials to make Models and Dies are stable,so many digital impression and 3D printing techniques have been developed to manufacture the Dies based on them.

It has not been studied and compared with existing materials.

This study was conducted to compare many materials and conventional and digital methods in the manufacture of the Dies to reach the best and most accurate way in the context of the manufacture of fixed prosthodontics that is accurate, fit and durable.

The first lower right molar[Frazaco] was prepared to receive a full ceramic crown.

Two impression techniques were used, one using conventional plastic and metal trays ,condensation silicone impression and the other using digital scanner by Smart Optics.

We used five different methods in the manufacture of Models and Dies, including four traditional depending on the gypsum stone Model IV and also on epoxy resin with or without air vacuum.

The fifth method used is based on digital techniques.

After the completion of the Models and Dies, the process of measuring the three dimensions [length, width and height] of the Dies began based on the Exocad dental program used in CAD [ computer assisted design].

Within the limits of this in – vitro study, the following conclusions were drawn: There are no significant statistical differences regarding Dies made from digital impression with 3D printing when compared with the main Die in terms of the three dimensions studied.

While the Dies made of gypsum stone Model IV from conventional impression using a plastic trays without air vacuum showed significant statistical differences.

Dies made of gypsum stone Model IV from conventional impression using a metal trays with or without air vacuum have shown expansion slightly.

The epoxy resin Dies from conventional impression using a metal tray with vavuum showed minimal contraction.