Abstract
Nowadays lots of material is produced to increase there-mineralization of tooth enamel. The eggshells are one ofmaterials that can also increase the re-mineralization of toothenamel. Eggshells are one of calcium carbonate sources with levelsof 95%. The egg produces waste in the form of eggshells. One ofthe alternatives in tackling the eggshells is to turn it into a calciumcompound. It is the main ingredient of bones and enamel tooth.This paper is proposed to investigate the effect of recurrent heatingon mechanical properties of artificial teeth. This review wasdescribed some study experimental that was performed to heat thespecimen with 20oC, 40oC, 100oC, and 120oC. The heating result ofspecimen was observed to determine the hardness using Brinneland Vickers scale. It was concluded that the higher of heatingtemperature will decrease the hardness of denture base acrylic.
Highlights
There are three types of removable partial dentures that can be distinguished according to their denture base materials: (1) denture metal framework, (2) acrylic, and (3) thermoplastic material often called Flexi or Valplast [1]
The color and optical properties remain stable under normal oral conditions, and its physical properties have been shown to be suitable for dental applications [2]
Acrylic resin is very sensitive to heat, its hardness will be reduced if it has recurring heating
Summary
There are three types of removable partial dentures that can be distinguished according to their denture base materials: (1) denture metal framework, (2) acrylic, and (3) thermoplastic material often called Flexi or Valplast [1]. Since the mid-1940s, most of the prosthesis bases were made by using methyl methacrylate poly resins. Acrylic resin is one of the dentistry materials that has been widely applied to the manufacture of the base denture, orthodontic plate, spoon special printing, and restoration of crowns and bridges with satisfactory results, both in aesthetic terms and in terms of their function [2]. Acrylic resin is very sensitive to heat, its hardness will be reduced if it has recurring heating. While the heat acrylic resin hardness value of polymerization is 20 VHN or 15 kg/mm (ASTM E1820). The value of the hardness indicates that acrylic resin is relatively soft and causes the acrylic resin to tend to thin out. It was evaluated some investigation to determine the effect of recurrent heating on acrylic-based acrylics
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