Publication: Effect of die lubricants on the compressive strength and surface hardness of a die stone.
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2015-04-21
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2015-05
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eng
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0125-5614 (printed)
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Mahidol University
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Mahidol University
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Urapepon S, Sinavarat P, Suchatlampong C. Effect of die lubricants on the compressive strength and surface hardness of a die stone. M Dent J. 2015;35(2):111-6.
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Somchai Urapepon, สมชาย อุรพีพล, Potchaman Sinavarat, พจมาน ศรีนวรัตน์, Chatcharee Suchatlampong, ชัชรี สุชาติล้ำพงศ์ (2015). Effect of die lubricants on the compressive strength and surface hardness of a die stone.. Retrieved from: https://hdl.handle.net/20.500.14594/1017.
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Effect of die lubricants on the compressive strength and surface hardness of a die stone.
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Abstract
Objective: The aim of this study was to determine the effect of 5
liquids used as die lubricants: microfilm, silicone oil, palm oil, slurry
water and water on the compressive strength and surface hardness of a
die stone.
Materials and methods: Five liquids; microfilm, silicone oil, palm oil,
slurry water and water, were applied on the die stone as die lubricants
and die stone without lubrication was served as control. Ten specimens
of the die stone for each test of compressive strength and surface
hardness were prepared. The specimens were stored at room
temperature for 24 hours and then soaked in each liquid for 1 minute.
The compressive strength test at speed 5 KN/min was preformed. The
hardness specimens were indented by Vicker hardness tester with 1
KgF load for 20 sec. Scanning electron microscope was used for study
of surface topography and the penetration of the liquids into the bulk of
the stone.
Results: Silicone oil and palm oil did not affect both compressive
strength and surface hardness of the die stone compared with control (p
>0.05). While the commercial die lubricant (microfilm®) affected the
compressive strength of the die stone compared with control (p<0.05). In
contrast, the slurry water and water affected both the compressive
strength and surface hardness of the die stone compared with control (p
<0.05). There were some oily character left moderately to less on the
surface of die stone lubricated with silicone oil, palm oil and microfilm
respectively. The specimen treated with distilled water demonstrated the
most far liquid penetration into the center of the specimen, followed by
the slurry water and microfilm, respectively. On the contrary, silicone oil
and palm oil did not show any liquid penetration into the specimen, only
wet on the specimen surface.
Conclusion: Silicone oil, palm oil did not affect both compressive
strength and surface hardness of die stone, while slurry water and
water decreased both properties of die stone.