The Effect of Coffee And Tea On Immersion of Thermoplastic Acetal Resin and Polyamide 12

Abstract

Tooth loss causes unstable occlusion which affects person's mastication, phonetic and esthetic. Removable partial denture is a suitable treatment to overcome these conditions. However, patients sometimes refuse to receive the treatment due to several problems such as economic problem, anxious with poor prosthetic's retention and aesthetic dissatisfaction resulting from the use of metal claps. There are two types of thermoplastic resin material which used as aesthetic crystal material alternative, namely polyoxymethylene (acetal resin) and polyamide 12 (thermosens). This study aimed to determine the highest colour change between acetal resins and thermosens, knowing the type of solution that causes the highest colour change in acetal resin and thermosens and to ascertain time required for the colour change of acetal resins and thermosens. A laboratory experimental study was performed by using 48 samples consist of 24 acetal resin plates and 24 thermosens plates, which each divided into four groups soaked in coffee and tea for 7 days and 14 days. The result of statistical test of Mann Whitney in the study group obtained information of p value on variable National Bureau of Standards smaller than 0.05 (p value <0.05) which considered as significant or statistically significant. The conclusion of this study showed acetal resin experienced a higher color changes. Tea solution is the highest solution causing discoloration. Acetal resins and thermosens change colour after use for 2.7 years. The conclusion of this study showed that acetal resin undergoes a higher color change compared with thermosens. Tea solution is the highest solution causing discoloration. Acetal resins and thermosens change color after immersion for 7 days.