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http://dx.doi.org/10.4047/jap.2022.14.4.236

Comparison of accuracy between digital and conventional implant impressions: two and three dimensional evaluations  

Bi, Chuang (Dalian Stomatological Hospital)
Wang, Xingyu (Dalian Medical University)
Tian, Fangfang (Dalian Medical University)
Qu, Zhe (Dalian Stomatological Hospital)
Zhao, Jiaming (Dalian Stomatological Hospital)
Publication Information
The Journal of Advanced Prosthodontics / v.14, no.4, 2022 , pp. 236-249 More about this Journal
Abstract
PURPOSE. The present study compared the accuracy between digital and conventional implant impressions. MATERIALS AND METHODS. The experimental models were divided into six groups depending on the implant location and the scanning span. Digital impressions were captured using the intraoral optical scanner TRIOS (3Shape, Copenhagen, Denmark). Conventional impressions were taken with the monophase impression material based on addition-cured silicones, Honigum-Mono (DMG, Hamburg, Germany). A high-precision laboratory scanner D900 (3Shape, Copenhagen, Denmark) was used to obtain digital data of resin models and stone casts. Surface tessellation language (STL) datasets from scanner were imported into the analysis software Geomagic Qualify 14 (3D Systems, Rock Hill, SC, USA), and scan body deviations were determined through two-dimensional and three-dimensional analyses. Each scan body was measured five times. The Sidak t test was used to analyze the experimental data. RESULTS. Implant position and scanning distance affected the impression accuracy. For a unilateral arch implant and the mandible models with two implants, no significant difference was observed in the accuracy between the digital and conventional implant impressions on scan bodies; however, the corresponding differences for trans-arch implants and mandible with six implants were extremely significant (P<.001). CONCLUSION. For short-span scanning, the accuracy of digital and conventional implant impressions did not differ significantly. For long-span scanning, the precision of digital impressions was significantly inferior to that of the traditional impressions.
Keywords
Accuracy; Dental implant; Digital impression; Conventional impression; Impression technique;
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