A Clinical Guide to Applied Dental Materials by Stephen J. Bonsor BDS(Hons) MSc FHEA/Gavin J. Pearson PhD BDS LDS

Author:Stephen J. Bonsor, BDS(Hons) MSc FHEA/Gavin J. Pearson, PhD BDS LDS [Bonsor, Stephen J.; Pearson, Gavin J.]
Language: eng
Format: epub
ISBN: 978-0-7020-4696-4
Publisher: Churchill Livingstone
Published: 2013-11-11T16:00:00+00:00

• The setting of the material will be slow unless the tray is cooled efficiently.

• The tray should be removed with a snap rather than easing the impression out of the mouth. This is less likely to produce distortion to the structure of the gel.

The reversible hydrocolloid system is probably the only true hydrophilic impression material. It is also the only impression material where the teeth may be left wet intentionally and is probably the most accurate. It is therefore mainly used when accuracy is very important, such as for fixed indirect restorations (crowns and bridges) and it is also used in dental laboratories to duplicate models. However, it must be handled with care to achieve successful results. The viscosity of the material should be such that it is sufficiently thick that it will be retained in the tray but not so viscous that the material will not flow around the teeth as the tray is seated. The impression must be thoroughly washed and all blood and saliva removed before pouring the cast.

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