Bad impressions slow the whole process down so here’s a few tips for perfect impressions every time:
Always check the position of the wisdom teeth. Invisalign trays are not long enough to capture most wisdom teeth. The trick is to overload the trays at the back and mould then support the heavy body material with your fingers until set. Then when you apply the light bodied material it will be trapped in the first impression and get a good result first time.
Mix the heavy body material quickly or the seperating wafer won’t stick to it and will dislodge on insertion.
Check the size of the tray in the mouth first. Really narrow arches require the smallest trays. These are inevitably too short so you overload the back and support the heavy body material as when dealing with wisdom teeth as outlined above.
When using the light body for the upper arch Ialways start off with my patient lying flat. Dry the teeth so the light body sticks to them, apply the light body then sit the patient up before placing the tray in the mouth.
For patients with a bad gag reflex use an anaesthetic spray to entirely numb the soft palate before doing impressions.
Heat the light body on an anaesthetic cartridge warmer. This speeds the setting time making it more pleasant for the patient.