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The aim of this study was to evaluate the influence of mixing technique of dental impression materials to linear dimension stability on stone cast. Fifteen stone cast formed of pouring alginat impression material (Hydrogum 5, Zhermack) obtained from maxillary typodont (Frasaco, Italy) as master model containing four metal pillars in square located in area of second premolar teeth (left and right), and two in the second molar area (left and right). Mixing techniques were done manually and mechanically (full dan semi automatic) and by pouring with dental stone type IV (Prostone-21, BMP Formula). The results are depicted of 5 models for each mixing techniques. Measurements were made in four parameters (ac, bd, a1b1 and c1d1) of 8 reference points on metal pillars. For this study data was analyzed using one-way Anova statistical test with level of significance at p <0.05 and processed with SPSS v.17. Of the four parameters measurement on each model, there was statistically significant processed differences of 3 parameters (ac, a1b1 and c1d1), whereas one parameter (bd) had no statistically significant differences (p = 0.375). It was concluded that the mixing technique of fully automatic mixer shows better results in terms of dimensional stability compared to the manual mixing technique and semi automatic mixer. Key word: hand mixing technique, mechanically mixing technique, alginator, fully automatic alginate mixer, semi automatic alginate mixer ABSTRAK Penelitian ini dimaksudkan untuk mengevaluasi pengaruh teknik pencampuran bahan cetak alginat terhadap stabilitas dimensi linier model stone. Sebanyak 15 buah model stone (tipe IV, Prostone-21, BMP Formula) diperoleh dari pengecoran cetakan bahan alginat (Hydrogum 5, Zhermack). Cetakan diperoleh dari model master typodont RA (Frasaco, Itali) yang memuat empat pilar dari metal berbentuk segi-4, dua pada daerah premolar dan dua di daerah molar kedua, masing-masing kiri dan kanan. Pencampuran bahan cetak dilakukan secara manual dan secara mekanik, yaitu semi automatic dan fully automatic. Dari cetakan dibuat 5 model untuk masing-masing teknik pencampuran. Pengukuran dilakukan untuk 4 parameter (ac, bd, a1b1, dan c1d1) dari 8 titik acuan pada pilar metal. Data diuji menggunakan uji Anova satu arah (p<0,05) menggunakan SPSS v.17. Dari empat parameter pengukuran pada setiap model, 3 parameter (ac, a1b1, dan c1d1) menunjukkan perbedaan yang bermakna, sedangkan parameter bd menunjukkan perbedaan yang tidak bermakna (p=0,375). Analisis data antar model pada teknik pencampuran secara mekanik menunjukkan perbedaan yang tidak bermakna secara statistik. Disimpulkan bahwa teknik pencampuran fully automatic menunjukkan hasil yang lebih baik dalam hal stabilitas dimensi dibandingkan dengan teknik pencampuran secara semi automatic dan manual. Kata kunci: teknik manual, teknik pencampuran mekanikal, alginator, fully automatic alginate mixer, semi automatic

journal of dentomaxillofacial science

Pengaruh teknik pencampuran bahan cetak alginat terhadap stabilitas dimensi linier model stone dari hasil cetakan Effect of mixing methods of alginate impression material on liniear dimensional stability of stone cast