Long-term dimensional stability and reproduction of surface detail of four polyvinyl siloxane duplicating materials.

Long-term dimensional stability and reproduction of surface detail of four polyvinyl siloxane duplicating materials. Research Abstract Details 

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Long-term dimensional stability and reproduction of surface detail of four polyvinyl siloxane duplicating materials. Abstract Text:

OBJECTIVES: Duplicating materials must routinely accurately reproduce the details of dental casts and thus contribute significantly to the close adaptation and success of a removable prosthesis or fixed indirect restoration. It is important to establish the long-term dimensional stability of polyvinyl siloxane materials (PVS) as they are widely used in dental technology and over the duration of a course of treatment, are stored under dental laboratory conditions. The dimensional stability of four PVS duplicating materials was investigated over a 13-week period. MATERIALS AND METHODS: Forty PVS duplicate moulds of a partially dentate maxillary arch were produced from four materials (Elite double 8, Gemini transparent, C & J pourable silicone and Z Dupe). Three dimensions were measured in triplicate at baseline 1, 5, 9 and 13 weeks using computerised image analysis. Half of the specimens were measured following storage at room temperature (21+/-2 degrees C) and half at 37 degrees C to represent storage in hot climates. Specimens for scanning electron microscopy were prepared by duplicating a rugosity standard. RESULTS: At room temperature two materials Elite Double 8 and Z Dupe showed no statistically significant dimensional change, the other two materials showed a slight increase of dimensions. Specimens stored at 37 degrees C showed greater differences in dimensions with Z Dupe showing statistically significant shrinkage. SEM investigation showed no surface deterioration of two materials. CONCLUSIONS: None of the materials showed a change in dimension greater than 2% and the four PVS materials showed good dimensional stability over the time period of the study.

Long-term dimensional stability and reproduction of surface detail of four polyvinyl siloxane duplicating materials. Publishing Authors By Initials

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Long-term dimensional stability and reproduction of surface detail of four polyvinyl siloxane duplicating materials. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of dentistry

VOLUME: 36

Page Numbers: 456-61

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ISSN: 0300-5712

DAY: 22

MONTH: 04

YEAR: 2008

Long-term dimensional stability and reproduction of surface detail of four polyvinyl siloxane duplicating materials. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Long-term dimensional stability and reproduction of surface detail of four polyvinyl siloxane duplicating materials.

AFFILIATION: King's College, London Dental Institute, Department of Prosthodontics, London, United Kingdom.

Country: England

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MEDLINETA: J Dent

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