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Measuring the Complete-arch Distortion of an Optical Dental Impression
Published on: May 30, 2019
Accuracy of implant impressions without impression copings: a three-dimensional analysis
Joo-Hyun Kwon1, Yong-Ha Son, Chong-Hyun Han
1Department of Prosthodontics, Gangnam Severance Dental Hospital, College of Dentistry, Yonsei University, Seoul, Korea.
The Journal of Prosthetic Dentistry
|June 7, 2011
Summary
Dental implant impressions using open tray impression copings yield more accurate definitive casts than those without copings. This finding is crucial for precise cement-retained implant restorations, especially with wider spacing.
Area of Science:
- Dental prosthodontics
- Implant dentistry
- Materials science
Background:
- Cement-retained implant restorations can utilize impressions made without impression copings.
- A comparative analysis of impression accuracy with and without copings is necessary.
Purpose of the Study:
- To evaluate and compare the dimensional accuracy of definitive casts made from implant impressions taken with and without impression copings.
Main Methods:
- Two impression techniques (with and without open tray impression copings) were used to fabricate definitive casts from a maxillary model with three implant replicas.
- Linear and rotational distortions of implant or abutment replicas were calculated using computerized analysis.
- The Mann-Whitney U test was employed to analyze differences between the groups.
Main Results:
- The group without impression copings (Group NC) exhibited significantly greater linear distortion along the Y-axis at the first molar site compared to the coping group (Group C).
- Increased linear and rotational distortion was observed in Group NC at the second molar site for most variables, excluding Z-axis linear distortion.
Conclusions:
- Definitive casts fabricated using open tray impression copings demonstrate superior dimensional accuracy compared to those made without copings.
- The accuracy advantage of using impression copings is more pronounced with increased inter-abutment distances.
