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The stability of temporary prosthetic base materials II: water sorption and its effects
Author(s) -
HEATH J.R.,
BORU T.K.,
GRANT A.A.
Publication year - 1993
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1111/j.1365-2842.1993.tb01638.x
Subject(s) - shellac , sorption , acrylic resin , dentures , composite material , materials science , chemistry , dentistry , coating , adsorption , medicine , organic chemistry
The bases of occlusal rims and trial dentures may sorb water during disinfection procedures, adjustment in the mouth and rinsing and cooling under running water. Such sorped water may adversely affect the properties of the baseplate materials. The room temperature water sorption of sheets of grey and pink shellac and cold cure acrylic resin was determined over 10 weeks by weighing. The Wallace surface hardness, linear dimension and transverse strength were also measured each week. Specimens were reweighed each week as they dried at room temperature. At the conclusion of the tests, the materials showed a change after soaking in weight, hardness, linear dimension and transverse strength, and change after drying relative to original mass for grey shellac of +1.5%, ‐48%, +0.7%, ‐58%, +0.33%; for pink shellac of +2.0%, ‐56%, +0.9%, ‐65%, +0.4%; and for acrylic resin of +1.2%, +10%, +0.4%, ‐30%, ‐2.1% respectively. The acrylic resin material was thus less affected by water sorption than the grey and pink shellac materials.