Taking Impressions PDF - Dr Ines Marques Avery (2023-24)

Taking impressions Ines Avery With thanks to Nick Rush Learning objectives To recall how to select and modify impression trays in preparation for an irreversible hydrocolloid impression To recognise the protocols for using, disinfecting and storing irreversible hydrocolloid impressions To outline th...

Taking impressions Ines Avery With thanks to Nick Rush Learning objectives To recall how to select and modify impression trays in preparation for an irreversible hydrocolloid impression To recognise the protocols for using, disinfecting and storing irreversible hydrocolloid impressions To outline the laboratory communication required for the construction of casts Why do we take impressions? - prescription - communication - records First… what are the materials? Elastomer? Addition silicone (PVS) Condensation silicone Polyether Polysulfide Hydrocolloid? Reversible Irreversible Zinc oxide? Compound? Wax? Which tray? Anatomy led tray selection 3mm alginate buccal/lingual Depth Width Length How to improve trays? Mixing alginate Measure! Powder and water Temperature WHICH ONE FIRST? How to load the tray Prepare the patient Clean mouth Dried teeth Alginate syringe? Wax undercuts where appropriate Vaseline? MAXILLARY IMPRESSION Patient sitting Operator standing MANDIBULAR IMPRESSION MANDIBULAR IMPRESSION MAXILLARY IMPRESSION MAXILLARY IMPRESSION MANDIBULAR IMPRESSION Removal LIFT MAXILLARY IMPRESSION ROTATE Review your impression Air bubbles Tears and drags Showthrough Adhesion Detail Desinfection Guidance – HTM 01-05 Rinse (blood, saliva, debris,…) Disinfect + rinse 100% humidity label Your prescription Food for thought Further reading https://www.ncbi.nlm.nih.gov/books/NBK574496/#:~:text=Four%20t ypes%20of%20elastomeric%20impression,medium%20body%2C%20 and%20light%20body. https://www.england.nhs.uk/publication/decontamination-inprimary-care-dental-practices-htm-01-05/