EFEK KOMPOSISI PARAFIN DAN MALAM LEBAH TERHADAP EKSPANSI TERMAL LINIER MALAM MODEL

EFFECT PARAFFIN AND BEESWAX RATIO TO LINEAR EXPANSION OF MODELLING WAX

Abstract

Modelling wax is a pattern wax for complete denture fabrication. It consists of various waxes and other components. The
composition influenced the physical properties of modelling wax. The objective of this study was to examine the effect of
paraffn to beeswax ratio on the linear thermal expansion (LTE) of modelling wax. The modelling waxes consist of paraffin (Pertamina, Kalimantan), beeswax (SEA, Yogyakarta), carnauba wax (PT Bratachem, Indonesia), and dammar
(Kalimantan). Five compositions of waxes were made with different paraffin to beeswax ratio (paraffin: beeswax: carnauba wax: dammar in % weight): K1 = 70:20:4:6, K2 = 72.5:17,5:4:6, K3 = 75:15:4:6, K4 = 77.5:12.5:4:6, and K5 =
80:10:4:6. Six specimens (305 x 22.2 x 14.3 mm) were made of each composition. The specimens were immersed in
bathing water at 25°C and 40°C for 20 minutes, and the specimen length was measured by travelling microscope after
each immersion. The percentage of the LTE was measured. Data were analyzed by one-way Anova and LSD0.05. The
results showed that the LTE of modelling waxes was between 0.27 + 0.02 % (70:20 ratio) and 0.73 + 0.06 % (80:10
ratio). The Paraffin to beeswax ratio influenced the LTE of modelling waxes and showed the significant differences
between all compositions (p<0.5). As conclusion, the paraffin to beeswax ratio influenced the linear thermal expansion of
modelling wax.