The choice of impression technique depends on implant geometry, patient anatomy, and the number of implants in one arch. There is no single answer for all cases — but there is a logic to the choice.
The choice of impression technique depends on implant geometry, patient anatomy, and the number of implants in one arch. There is no single answer for all cases — but there is a logic to the choice.
Open Tray vs. Closed Tray — Comparison
Parameter
Open Tray
Closed Tray
Visual Control
Direct
Indirect (via model)
Accuracy
Higher
Lower (transfer error possible)
Sensitivity to Patient Movement
Greater
Lesser
Indication
Esthetic zone, 1-2 implants
Multiple implants, limited mouth opening
Execution Time
Longer
Shorter
Open Tray — When to Choose
The open tray provides direct control — you can see the implant and check the axis and depth in real time.
Indications:
Implants in the esthetic zone — axis control relative to the future crown
Complex anatomy (limited depth, difficult access)
One or two implants with demanding geometry
Disadvantages:
Sensitivity to patient movement — a slight head movement changes the transfer's position in the material
Abundant soft tissue makes access to the transfer difficult
The tray material must be rigid — soft material distorts under pressure
Closed Tray — Indications and Limitations
The closed tray works indirectly — the transfer conveys the implant's position to the model without direct control.
Indications:
Multiple implants in one arch — repeatability is more important than individual precision
Limited mouth opening
Patients with a strong gag reflex
Limitations:
Lack of direct position control
Transfer errors accumulate — weakened transfer = incorrect position
Access to the material can be difficult in deep areas
Most Common Errors
Leaky Tray — material leaks from the side, you lose accuracy. Work with transparent material to see where it exits.
Insufficient Setting Time — material acts like rubber, not a rigid carrier. Minimum 15 seconds for thin layers, 30 seconds for thicker ones.
Incorrect Tray Geometry — check the manufacturer's kit for available sizes.
Transfer Movement After Material Application — if the transfer moves during setting, the result is useless.
How to Prepare the Patient
Explain what will happen — dry field, a moment without swallowing.
Give a signal (raise hand) if discomfort is felt.
Dry the field before applying the material — moisture is the enemy of accuracy.
Work quickly and methodically.
LABORATORY PERSPECTIVE
Contact deltalabs. — we will advise on the best solution for your case.