Abstract
Purpose : The purpose of this study was to determine the effect of aluminum oxide addition on heat polymerized acrylic (HPA) resin denture base to flexural strength and color stability. Method : This study was carried out on HPA resin samples without and with the addition of aluminum oxide with a concentration of 0.5%, 1.5%, 2.5%. A bar-shaped sample sized 65 x 10 x 3 mm was used for flexural strength testing and circular-shaped sample with a diameter of 50 mm x 1 mm (no. 80) was used for color stability testing; 24 samples for flexural strength test and 24 samples for color stability test. All samples were immersed in distilled water for 48 hours at 37 ° C in an incuba-tor. A universal testing machine was used to test flexural strength and a portable colorimeter was used for color stability testing. Conclusion : The addition of 0.5% aluminum oxide significantly increase the flexural strength and has good color stability.
Highlights
Denture base is a part of denture that rests on soft tissue and does not include the artificial teeth.[1]
Denture base material is divided into two groups, metal and nonmetal.2.3 Non-metal denture base, namely resins, can be classified into two groups based on their thermal reactions, namely thermoplastics and thermosets.4.5 Thermosets are resins which, once formed, cannot be reshaped by heating, and cannot be recycled
The Heat polymerized acrylic (HPA) resins have good aesthetics, because of its translucent colors and they are close to gingival colors
Summary
Denture base is a part of denture that rests on soft tissue and does not include the artificial teeth.[1] Denture base material is divided into two groups, metal and nonmetal.2.3 Non-metal denture base, namely resins, can be classified into two groups based on their thermal reactions, namely thermoplastics and thermosets.4.5 Thermosets are resins which, once formed, cannot be reshaped by heating, and cannot be recycled. Acrylic resin is the most widely used materials for the manufacture of dentures.[5] Heat polymerized acrylic (HPA) resins were the denture base materials which bear the polymerization process by applying heat This material has many advantages such as easy to process and polish, aesthetically affordable, and low toxic, but it has low mechanical properties, resulting in frequent denture base fractures. The degree of color change was determined by a colorimeter or spectrophotometer that has a standard; if the value of ΔE is more than 3.7 the color is unstable.[7,8,9]
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