Acrylic Resin Crowns
1. The temporary crown should be easily shaped, contoured.
2. To demonstrate stability of colour, and its matching to the colour and translucency of the adjacent natural teeth.
The perfect temporary restoration should meet all these biologic, mechanical and esthetic requirements. Although the ideal dental material for temporary crowns and bridges is not discovered yet, contemporary dental medicine can use a number of materials for their fabrication that demonstrate optimum clinical and technological quality.
The temporary crowns can be fabricated using various materials and methods. A common feature of all technological procedures is the use of 2 components:
- ESF (External Surface Form), usually a silicone impression, or a pre-fabricated prototype.
- ITF (Internal Tissue Form) – the abutment or the abutments and mucosa for the bridge restorations.
The Plastic Material Is Pressed Or Syringed Between The Two Forms
There are two basic types of ESF: prefabricated and custom. The custom made forms are more popular and frequently used – heavy body silicones, thermoplastic foil (polypropylene or cellulose acetate) – fabricated in special devices under pressure or in vacuum. The custom-made forms need a full-arch impression before tooth preparation. The impression is the external form, by which the plastic material is pressed to the prepared tooth or teeth on the model.