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Effects of Implant Angulation and Impression Coping Type on the Dimensional Accuracy of Impressions

Shim, Ji Suk DDS, MSD*; Ryu, Jae Jun DDS, PhD; Shin, Sang Wan DDS, PhD; Lee, Jeong Yol DDS, PhD§

doi: 10.1097/ID.0000000000000336
Basic and Clinical Research
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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.

*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.

Reprint requests and correspondence to: Jeong Yol Lee, DDS, PhD, Department of Advanced Prosthodontics, Korea University Guro Hospital, #148, Gurodong-ro, Guro-gu, Seoul 152-703, Korea, Phone: 82-2-866-1422, Fax: 82-2-866-1499, E-mail: wddc@korea.ac.kr

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