How Not to Cry Whilst Injection Moulding - Secrets to Reduce Excess and Clean Up - PDP280

Injection moulding is meant to save you time. Too often it hands you a mouthful of flash and a cleanup that swallows the chair time you thought you were saving.

Dr Sandra Hulac is a Clinical Instructor at the Kois Center in Seattle and an Accredited Fellow of the American Academy of Cosmetic Dentistry. She uses full-mouth injection moulding to road-test occlusions and stabilise breaking-down dentitions, and she teaches the technique hands-on.

In this episode she works through where the mess actually comes from, and how design, matrix strategy, careful PTFE and a simple cleanup protocol keep a case clean from the first injection.

This episode comes with an infographic: the whole no-mess workflow on one visual guide to keep beside you during design and cleanup. Download it at protrusive.co.uk/nomess. It is the fastest way to turn this episode into something you actually use at the chair.

What You’ll Take From This Episode

Most injection-moulding mess is prevented at the design stage, through thickness targets and clear lab communication, long before any cleanup.

The alternating matrix technique, injecting every other tooth, is the biggest single cleanup saver and cuts the PTFE you need.

Matrices cured in a pressure pot, with a spacer protocol, give even thickness and far fewer bubbles.

Thin, careful PTFE prevents distortion; bunching it interproximally creates the very excess you are trying to avoid.

An S-shaped motion with a Ceri-saw and several 12-plate blades clears resin while protecting the contact.

Good pre-treatment hygiene, using diluted hypochlorite or povidone-iodine rather than chlorhexidine, cuts bleeding and contamination.

Highlights of this episode: