The single biggest driver of a good result, and how to get it right, zones, principles, and the errors to avoid.
If there is one stage that determines the quality of a finished finger prosthesis, it is the impression. Capture it well and everything that follows, the fit, the proportion, the realism, has the foundation it needs. Capture it poorly and no amount of skill downstream fully recovers it. This guide covers what a reliable impression requires.
The impression is the single biggest driver of the final result. It records the shape, contour and seating of the residual finger, everything the device is built around. A small error here is baked into every later step, so the time spent getting it right is the highest-value time in the whole process.
A complete impression captures four distinct zones, each doing a different job:
Four principles separate a reliable impression from an unreliable one:
If you take one thing from this guide: the most common, most avoidable error is compression during set. Steadying the residuum with pressure feels natural, but it bakes a fault into every later step by recording a smaller, distorted shape. Support the hand from positions that do not load the impression surface, and if in any doubt, recapture before the patient leaves. A few extra minutes at this stage saves a remake later.
The impression is one part of a method that also covers measurement, colour matching, acceptance and fitting. The BioDigit training teaches the full method for each, and the Fitting Guide and Chairside Checklist serve as references at the bench. This article is an overview; the training is where the technique is taught in full.
Technique aside, suitability and clinical decisions remain yours, governed by your registration and judgement. The method concerns how to capture and build the device well; whether and when to proceed is your call as the treating clinician.
