Air Bubble Formation in Alginate Impression Generated by Hand Mixing, Invented Semi-Automatic Machine and Automatic Centrifuge Machine

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Suwadee Aerarunchot
Panassaya Hathaidechadussadee
Pattheera Uasuwan
Sakonwan Namchaitaharn


This study aimed to determine the effect of hand mixing, invented semi-automatic machine and automatic centrifuge machine on air bubble formation in alginate impression material. A total of 45samples was divided into three groups (15 samples per group) by mixing method, then counted and calculated air bubble by NIS-Element BR program. In term of percent area of air bubble formation, Kruskal Wallis and Mann Whitney-U test showed statically significant difference between each group (P< 0.05), 95% CI. In part of quantity, the invented semi-automatic machine had mean of percent of area of air bubbles in alginate sampleless than hand mixing but more than the group of automatic centrifuge machine. The result concluded that the invented semi-automatic machine can be used instead of hand mixing.


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Aerarunchot S, Hathaidechadussadee P, Uasuwan P, Namchaitaharn S. Air Bubble Formation in Alginate Impression Generated by Hand Mixing, Invented Semi-Automatic Machine and Automatic Centrifuge Machine. Khon Kaen Dent J [Internet]. 2020 Aug. 25 [cited 2023 Jan. 29];23(2):50-6. Available from:
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