Influence of stone mixing agents, impression materials and lubricants on surface hardness and dimension of a dental stone die material.

Abstract:

:The influence of different stone mixing agents, impression materials and lubrication methods on the surface hardness of a stone die material has been evaluated. For one impression material the dimensional effect of the mixing agents and lubrication on the dies was also studied. The stone die material was mixed with water or a gypsum hardener and allowed to set on surfaces of glass, agar-agar, polyether, polysulfide and silicone impression materials. The lubrication methods for the stone were mineral oil, water soluble lubricant and mineral oil followed by water soluble lubricant. The surface hardness was measured according to the Brinell test. The Brinell test was chosen after a comparative study of the Brinell, Vickers and Knoop hardness test methods. The results showed that gypsum hardener was preferable to distilled water. The impression materials appear to have influence on the surface hardness of stone. The effect differed on water mixed and hardener mixed stone which emphasizes the importance of the mixing agent. All lubrication decreased the surface hardness of stone. With hardener mixed stone the combination of mineral oil followed by water soluble lubricant seemed preferable. Neither the gypsum hardener nor the lubrication influenced the dimension of the stone die material.

journal_name

Acta Odontol Scand

authors

Johansson EG,Erhardson S,Wictorin L

doi

10.3109/00016357509004622

subject

Has Abstract

pub_date

1975-01-01 00:00:00

pages

17-25

issue

1

eissn

0001-6357

issn

1502-3850

journal_volume

33

pub_type

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