Abstract
Accuracy of implant position reproduction according to various types of scanners, implant placement depths, and tooth positions are unknown. The purpose of this study was to compare the accuracy of implant position reproduction for differences in the exposed length of the implant scan body according to scanner type and tooth position. Implants were placed at the positions of the lateral incisor, first premolar, and first molar in the study model at the bone level and submerged 1.5 mm, 3.0 mm, 4.5 mm, and 6.0 mm. The completed models were scanned with one type of tabletop scanner and three types of intraoral scanners (TRIOS 3, i500, and CS3600). A matching process was performed for all scan data to superimpose abutment library data on the scan body, and the root mean square errors were analyzed in three dimensions to evaluate the position reproducibility of the replaced abutment library. In the trueness analysis, the error increased rapidly for an implant placement depth of 4.5 mm, and was largest for a submersion of 6.0 mm. The precision analysis confirmed that the error increased for depths of at least 3.0 mm. The analysis by position identified that the accuracy was lowest for an implant placed at the position of the lateral incisor. These findings indicate that special care is required when making an impression of a deep implant with an optical scanner.
Highlights
Dental impression-taking is a basic technique of dental treatment used to recreate the oral cavity of individual patients
In order to identify the accuracy in reproducing the implant position according to changes in the exposed length of the implant scan body (ISB), scanner type, and tooth position, three-way was performed compare the average standard deviations
Rather than connecting the ISB directly to the fixture, the accuracy can be increased by connecting a component of a supragingival level using a stock abutment or a multiunit abutment first and performing a digital scan with an ISB
Summary
Dental impression-taking is a basic technique of dental treatment used to recreate the oral cavity of individual patients. The obtained dental impression and the model created with it can be used for various tasks such as diagnosis, communication with the patient, treatment plan, restoration, and oral device fabrication [1,2,3,4,5]. Obtaining an accurate dental impression is a very important starting point when providing optimal treatment to the patient [3,6,7]. In the case of fabricating implant-supported prostheses after taking impressions, the accuracy of recording impressions for obtaining a passive fit is much more important than for a prosthesis fabricated on natural tooth abutments because there is no periodontal ligament between the implant fixture and the bone, and so the elasticity is low [8,9]. The increase in the complication rate with the occlusal load may be greater for implant restorations than for tooth-born restorations [14,15]
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