Abstract
ObjectivesTo investigate the congruence between the meshes of a combined healing abutment-scan body (CHA-SB) system acquired with four different intraoral scanners and the corresponding library file. Material and methodsA CHA-SB was fixed to an implant at the right first molar position in a dentate mandibular model and digitized by using 4 different intraoral scanners (IOSs) [TRIOS 3 (T3), Omnicam (OC), Primescan (PS), and Virtuo Vivo (VV)] (n = 8) and an industrial grade optical scanner (ATOS Core 80) (n = 1) to generate standard tessellation language (STL) files of the test scans (CHA-SB-STLs) and the master reference model scan (MRM-STL). A reverse engineering software (Studio Geomagic X) was used to superimpose the proprietary library file of the CHA-SB over the generated STL files. Root mean square (RMS) values representing the deviations between the library file and the superimposed STL files were statistically analyzed by using 1-way ANOVA (α=0.05). Qualitative analysis of the deviations was performed by visual inspection. ResultsDifferences between the congruence of the library file and the CHA-SB scans among different IOSs were nonsignificant (F = 1.619, df= 3, P = .207). The single best result was 29 ± 28.9 µm for OC, 30.8 ± 29.6 µm for VV, 35.6 ± 35.5 µm for T3, and 39.5 ± 39.2 µm for PS, which were all above the deviation value of the scan performed by using the industrial-grade scanner (23.2 ± 23.2 µm). ConclusionThe dimensional congruence between the library file and the STL file of the CHA-SB system scans was similar when intraoral scanners with different acquisition technologies were used to scan a model with an implant. Clinical significanceScans of the tested intraoral scanners may result in crowns with similar positional accuracy, given the similarities in congruence of their scans with the library file.
Highlights
Impression is a critical step in implant-supported prosthetic reha bilitation [1]
Introduced combined healing abutment (HA)-scan body (CHA-scan bodies (SBs)) system overcomes these problems as it consists of an HA that contours the peri‐implant soft tissue and a SB that is fitted into the screw access hole of the HA
One-way analysis of variance (ANOVA) revealed that there were no significant differences among the dimensional congruence of the CHA-SB system scans per formed with different intraoral scanners (IOSs) (F = 1.619, df= 3, P= .207)
Summary
Due to the rapid development of computer aided design-computer aided manufacturing (CAD-CAM) and intra oral scan ners (IOSs), it is possible to digitize implants in a direct digital workflow [1,2,3] This method is performed by scanning intra oral scan bodies (SBs) with an IOS [4] and has improved patient comfort with the elimination of conventional impression materials and trays, eliminates the need for a stone cast, and enables a faster and more efficient communication be tween the clinician and the laboratory [1, 5,6,7]. Potential soft-tissue collapse, which may happen during the removal of a custom HA or interim prosthesis that was used to anatomically shape the per i‐implant soft tissues, is eliminated [10]
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