In vitro comparative evaluation of mechanical properties of temporary restorative materials used in fixed partial denture

Abstract

Introduction: Materials used to fabricate provisional restorations can be classified as acrylics or resin composites. Provisional crows can be either prefabricated or custom made.

Acrylics: These materials have been used to fabricate provisional restorations since the 1930s and usually available as powder and liquid. They are the most commonly used materials today for both single-unit and multiple-unit restorations. In general, their popularity is due to their low cost, acceptable esthetics, and versatility.

Composites: Composite provisional materials use bis-acryl resin, a hydrophobic material that is similar to bis-GMA. Composites are available as auto-polymerized, dualpolymerized and visible light polymerized.

Preformed crowns: Preformed provisional crowns or matrices usually consist of tooth-shaped shells of plastic, cellulose acetate or metal. They are commercially available in various tooth sizes and are usually selected for a particular tooth anatomy. They are commonly relined with acrylic resin to provide a more custom fit before cementation, but the plastic and metal crown shells can also be cemented directly onto prepared teeth.

Aims and objectives: The aim of this study is to choose a material to serve as a better interim prosthesis and to compare three different properties - flexural strength, compressive strength, and color stability.

Materials and methods: The samples were made with three different provisional materials (Revotek LC, Protemp 4, TemSpan).

Result: It was inferred from the study that no one material was superior in all three tested parameters.

Keywords: Fixed partial denture; mechanical properties; provisional materials.

Figure 1

Stainless steel mold for flexural strength and compressive strength specimens

Figure 2

Stainless steel mold for color stability specimens

Figure 3

Specimen A samples

Figure 4

Specimen B samples

Figure 5

Sample under flexural load

Figure 6

Sample under compressive load

Figure 7

Sample evaluation using spectrophotometer

Graph 1

Color graphic representation of the mean of the flexural strength value changes of three groups at different time interval measurements

Graph 2

Color graphic representation of the mean of the compressive strength value changes of three groups at different time interval measurements

Graph 3

Color graphic representation of the mean of the color changes of three group different time interval measurements