The best impression technique for implants is open-tray impressions. Open-tray impressions involve using an open tray impression coping that is attached to the implant fixture intraorally. This technique provides the most accurate capture of the implant position in relation to the surrounding structures.
One of the main advantages of open-tray impressions is that they allow for the accurate capture of the implant position, especially when implants will be splinted prosthetically. This is important because the accuracy of the implant position directly affects the fit and function of the final implant-supported prosthesis.
When using open-tray impressions, the impression coping is first attached to the implant fixture intraorally. The tray is then loaded with impression material and seated over the impression coping. Once the material sets, the tray is removed, and the impression coping remains securely attached to the implant. This allows for an accurate transfer of the implant position to the laboratory.
Compared to closed-tray impressions, open-tray impressions offer several advantages. With open-tray impressions, there is direct visualization of the implant position during the impression procedure, which ensures accurate capture. In closed-tray impressions, the impression coping is seated inside the tray, which can make it difficult to verify the implant position during the impression process.
Open-tray impressions also provide better access to the implant fixture for cleaning and disinfection. Since the impression coping remains attached to the implant, it can be easily removed and cleaned before the final prosthesis is fabricated. This helps to minimize the risk of contamination and ensures a clean and accurate impression.
I have personally found open-tray impressions to be highly reliable and accurate in my clinical practice. The ability to visualize the implant position during the impression procedure gives me confidence in the accuracy of the final prosthesis. Additionally, the ease of cleaning and disinfection of the impression coping adds another layer of assurance in delivering a clean and hygienic final prosthesis to my patients.
Open-tray impressions are the best technique for capturing implant positions accurately, especially when implants will be splinted prosthetically. They offer direct visualization of the implant position, better access for cleaning and disinfection, and provide a reliable and accurate transfer of the implant position to the laboratory.