Accuracy of Silicone Impressions and Stone Models Using Two Laboratory Scanners: A 3D Evaluation

Sampaio-Fernandes, M A; Pinto, Ricardo Figueiredo; Sampaio-Fernandes, M M; Sampaio-Fernandes, J C; Marques, Duarte; Figueiral, Maria Helena

doi:10.11607/ijp.8074

Cited by 6 publications

(10 citation statements)

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“…Therefore, considering the minimal differences observed in both qualitative and quantitative evaluations between assessment methods, a laboratory-based optical 3D scanner with 12 MP resolution can be considered a reliable and precise tool for performing measurements and creating virtual models of real instruments. In fact, the high precision of the scanner used in the present study is currently considered the gold standard for this type of digital resource [ 23 ].…”

Section: Discussionmentioning

confidence: 99%

“…An additional analysis was conducted to compare the accuracy of 3D virtual models of the same instrument obtained through high (12 MP) and low (5 MP) resolution optical scanners with a micro-CT imaging system. Previous research has suggested that the resolution of laboratory-based 3D scanners is a determining factor in their accuracy [ 23 ]. As expected, the low-resolution scanner was not able to accurately replicate the instrument’s geometry, whereas the best results were achieved with the 12 MP scanner ( Figure 4 ).…”

Section: Discussionmentioning

confidence: 99%

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3D Surface Scanning—A Novel Protocol to Characterize Virtual Nickel–Titanium Endodontic Instruments

et al. 2023

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The nickel–titanium (NiTi) instruments’ geometry plays an important role in their performance and behavior. The present assessment intends to validate and test the applicability of a 3D surface scanning method using a high-resolution laboratory-based optical scanner to create reliable virtual models of NiTi instruments. Sixteen instruments were scanned using a 12-megapixel optical 3D scanner, and methodological validation was performed by comparing quantitative and qualitative measurements of specific dimensions and identifying some geometric features of the 3D models with images obtained through scanning electron microscopy. Additionally, the reproducibility of the method was assessed by calculating 2D and 3D parameters of three different instruments twice. The quality of the 3D models created by two different optical scanners and a micro-CT device was compared. The 3D surface scanning method using the high-resolution laboratory-based optical scanner allowed for the creation of reliable and precise virtual models of different NiTi instruments with discrepancies varying from 0.0002 to 0.0182 mm. The reproducibility of measurements performed with this method was high, and the acquired virtual models were adequate for use in in silico experiments, as well as for commercial or educational purposes. The quality of the 3D model obtained using the high-resolution optical scanner was superior to that acquired by micro-CT technology. The ability to superimpose virtual models of scanned instruments and apply them in Finite Element Analysis and educational purposes was also demonstrated.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

3D Surface Scanning—A Novel Protocol to Characterize Virtual Nickel–Titanium Endodontic Instruments

et al. 2023

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“…Laboratory scanners do not reveal this pattern since large parts of the impression are simultaneously captured, minimizing the effect of error [20]. Furthermore, it is difficult to acquire accurate scans due to narrow and deep shapes that may be hidden in the impressions [8]. However, in impressions from completely edentulous patients, there are no deep surfaces, which increases the scan accuracy potential [27].…”

Section: Discussionmentioning

confidence: 99%

“…The digital impression can be acquired via two methods: (i) directly, using an intraoral scanner (IOS) for image acquisition and producing a 3D virtual model without using conventional impressions; and (ii) indirectly, using an extraoral scanner (EOS) to scan the stone model to create a 3D virtual model [5][6][7][8]. The STL (standard tessellation language) files corresponding to a three-dimensional dataset of the model are sent and stored electronically, improving efficiency [9].…”

Section: Introductionmentioning

confidence: 99%

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Accuracy of Extraoral Digital Impressions with Multi-Unit Implants

Sampaio-Fernandes,

Pinto,

Almeida

et al. 2023

Applied Sciences

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The aim of this in vitro study was to evaluate the accuracy of impressions made using two different silicones and corresponding stone casts in full-arch implant rehabilitation, using two laboratory scanners. A master model with six dental implants was created, scanned with a 12-megapixel scanner and used as digital master model. Ten implant impressions were obtained via two silicone impressions systems—Coltene® and Zhermack®—using the open-tray technique and poured gypsum. Two extraoral scanning systems (S600 ARTI Zirkonzhan® and Identica T500 Medit®) were used to scan the impressions and stone casts. Best-fit superimpositions were conducted between the master model and the virtual models obtained. A significance level of p < 0.05 was considered. The accuracy of the Medit® scanner was 82.26 [53.18; 111.34] µm for Coltene® silicone and 87.43 [72.00; 102.86] µm for Zhermack® silicone, and the accuracy of the Zirkonzhan® scanner was 69.90 [62.37; 77.43] µm for Coltene® silicone and 80.67 [65.77; 95.57] µm for Zhermack® silicone, without significant differences between scanners. When comparing the two silicones, no significant differences were found for the Medit® (p = 0.112) or Zirkonzhan® scanners (p = 0.162). The Zhermack® scanner showed better accuracy than the corresponding stone casts in the two scanners, Medit® (p = 0.019) and Zirkonzahn® (p = 0.002). The extraoral digitalization of impressions in edentulous dental arches with six implants proves to be a valid technique.

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Accuracy of occlusal splints printed in different orientations by liquid crystal display technology: an in vitro study

Cruz-Araújo,

Sampaio-Fernandes,

de Freitas

et al. 2025

Journal of Dentistry

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Accuracy of Silicone Impressions and Stone Models Using Two Laboratory Scanners: A 3D Evaluation

Cited by 6 publications

References 0 publications

3D Surface Scanning—A Novel Protocol to Characterize Virtual Nickel–Titanium Endodontic Instruments

3D Surface Scanning—A Novel Protocol to Characterize Virtual Nickel–Titanium Endodontic Instruments

Accuracy of Extraoral Digital Impressions with Multi-Unit Implants

Accuracy of occlusal splints printed in different orientations by liquid crystal display technology: an in vitro study

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