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Accuracy of Implant Abutment Level Impression with and without Impression Coping
Yousef Jahandideh1, Anahita A Moghaddam1, Hossein Pourkhalili2
1Department of Prosthodontics, Dental Sciences Research Center, Guilan University of Medical Sciences, Rasht, Islamic Rebublic of Iran.
The Journal of Contemporary Dental Practice
|January 4, 2019
Summary
Comparing direct and indirect implant impression methods, this study found indirect impressions slightly more accurate. However, both methods showed no significant overall difference, suggesting direct impressions are a viable option for dental prosthetics.
Area of Science:
- Dental Materials Science
- Prosthodontics
- Biomaterials
Background:
- Accurate transfer of patient's hard and soft tissue data is crucial for dental laboratory work.
- Various implant impression techniques yield different outcomes in final cast dimensions.
Purpose of the Study:
- To compare the accuracy of two abutment level implant impression methods: direct (without coping) and indirect (with coping).
- To evaluate dimensional accuracy on two parallel implants with varying distances to the canine.
Main Methods:
- An experimental study using a resin model with two parallel implants.
- Two impression methods were tested: direct (without impression coping) and indirect (with impression coping).
- Stone casts were analyzed using a Coordinate Measuring Machine (CMM) in three dimensions (X, Y, Z).
Main Results:
- No significant difference was found between direct and indirect methods in the Y and Z axes (absolute transmission, Δr).
- Dimensional changes in the X-axis were significantly greater in the direct method (0.647 ± 0.155) compared to the indirect method (p=0.044).
Conclusions:
- Indirect impression at the abutment level is marginally more accurate than direct impression.
- Despite minor differences, both methods are generally comparable, allowing dentists to choose direct impressions for simpler prosthetic cases.
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