Related Experiment Video
Updated: Apr 3, 2026
Measuring the Complete-arch Distortion of an Optical Dental Impression
Published on: May 30, 2019
Effects of Implant Angulation and Impression Coping Type on the Dimensional Accuracy of Impressions
Ji Suk Shim1, Jae Jun Ryu, Sang Wan Shin
1*Affiliated Professor, Department of Prosthodontics, Faculty of Dentistry, Korea University Ansan Hospital, Seoul, Korea. †Full-Time Professor, Department of Prosthodontics, Faculty of Dentistry, Korea University Anam Hospital, Seoul, Korea. ‡Full-Time Professor, Department of Prosthodontics, Faculty of Dentistry, Korea University Guro Hospital, Seoul, Korea. §Affiliated Professor, Department of Advanced Prosthodontics, Faculty of Dentistry, Korea University Guro Hospital, Seoul, Korea.
Purpose:
To analyze the accuracy of impressions in relation to implant angulation and type of impression coping.
Materials And Methods:
Three metal master models with 2 implants of 3 different angulations (parallel, mesiodistal, and buccolingual) were fabricated. Nine groups of experimental models were fabricated to duplicate the 3 master models using 3 types of impression copings: transfer, pick-up, and hybrid. The distance between the analogs for each model was measured using a video measuring system. The influence of angulation and type of impression coping was analyzed by a two-way ANOVA (P < 0.05).
Results:
There were significant differences in error rates in relation to implant angulation and type of impression coping (P < 0.05). Impressions of buccolingually divergent implants with transfer copings showed statistically higher error rates than other groups (P < 0.05).
Conclusions:
Buccolingual divergence can be a variable that influences the impression accuracy of transfer copings compared with pick-up and hybrid copings. Hybrid copings demonstrate reasonable reproducibility similar to that of pick-up copings.
