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Irreversible impression compounds, also known as thermoplastic impression materials, are a type of dental material used to take accurate and detailed impressions of a patient's teeth and oral tissues. They are called "irreversible" because once they set, they cannot be softened or reshaped, making them suitable for single-use impressions. These materials have been widely used in dentistry for many years due to their favorable properties and ease of use. Composition: Irreversible impression compounds are composed of a mixture of waxes, resins, and fillers. The primary components of these materials include: 1. Waxes: Waxes provide the thermoplastic property to the impression compound. They become soft and pliable when heated and harden upon cooling, making them suitable for capturing fine details of the oral tissues. 2. Resins: Resins are added to the mixture to enhance the strength and rigidity of the impression compound once it sets. They contribute to the mat