![]() Elastic properties make it a suitable material for taking impressions where there are undercuts. ![]() Some materials are available that change colour as they change state this aids in ensuring that materials are completely set prior to removal from the mouth.Working and setting times may be adjusted by increasing or decreasing the temperature of the water (increasing temperature, decreases working and setting times and decreasing temperature increases working and setting times).Available in regular and fast-set forms.A measuring scoop and water measure are included with the alginate materials. Material constituents/compositionĪvailable in jars, bulk packaging and pre-measured packs. It is mixed with water to achieve the desired mixture. ![]() Irreversible Hydrocolloid Impression Material (Alginate)Īlginate is one of the most commonly used impression materials in the dental surgery with wide range of uses. Special water bath with three compartmentsī.Care must be taken to ensure that the water bath is not contaminated during use ( Figures 11.2n– 11.2o). There is no manipulation needed for agar impression materials, but a special water bath with three compartments ( Figure 11.1n) is needed to facilitate the use of this impression material. Trays are very bulky and may not be tolerated by certain patients.Indications and contraindications for use Indications Claims to be reusable, but due to infection control issues this is not acceptable.Initially expensive to purchase specialised equipment.Used for hard and soft tissue impressions.Once set to the gel state, given the right temperature, it can be reversed to the liquid (sol) state.The material has two forms: sol (fluid) and gel (more viscous).Reversible Hydrocolloid Impression Material (Agar)Īgar impression materials have been largely replaced by rubber impression materials. ( Adapted from the Cross Infection Control Policy, Dublin Dental Hospital, 2010.) ELASTIC IMPRESSION MATERIALS – HYDROCOLLOID IMPRESSION MATERIALS A. When receiving laboratory work, disinfect and rinse prior to inserting into the patient’s mouth. Staple laboratory prescription to the sealed bag above the seal, taking care to not perforate bag.Complete laboratory prescription ensuring that the date, time and solution of disinfectant is recorded.Disinfected impressions should be prepared for the laboratory by placing in a sealable bag, taking care to not cross-contaminate the bag.It is essential that good cross-infection control practices are followed during impression decontamination avoid contamination of immersion bath and sink.After impression decontamination, rinse impression in the designated sink.Follow the manufacturer’s instructions in relation to the immersion of the dental impression in a disinfectant solution for material compatibility and length of immersion.The disinfection process will be impeded without adequate removal of blood and/or debris. ![]() Wash in a designated sink to remove the same ![]()
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