Guest Commentary: The Battle of File Formats from Intraoral Optical Scanners

Türkyilmaz, Ilser; Lakhia, Samantha; Tarrida, Lluís Giner; Varvara, Giuseppe

doi:10.11607/ijp.2020.4.gc

Cited by 16 publications

(17 citation statements)

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“…Impression data obtained by oral scanners typically use “.stl” files, which have only black and white morphological information about the intraoral geometry. In comparison, “.obj” and “.ply” files have information such as color, texture, and transparency in addition to morphological information on shapes in the mouth, which helps distinguish teeth from surrounding soft tissues [ 49 ]. The scope of extraction of supported file types may vary depending on the oral scanner; so, this should be considered depending on the scope of use.…”

Section: Discussionmentioning

confidence: 99%

The Effects of Orthodontic Brackets on the Time and Accuracy of Digital Impression Taking

Heo

Kim

2021

IJERPH

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Background: The aim of the study was to study how the presence or the type of the orthodontic brackets influence the time measurement and accuracy of impressions using a digital oral scanner. Methods: The same models were divided into the control group (the model without a bracket), MB group (the model with a metal bracket), and CB group (the model with a monocrystalline bracket). Subsequently, scanning was conducted five times for each model using the Trios Pod 2®. Simultaneously, the duration for taking the digital impression was measured. The degree of accuracy was compared among the three groups. Results: As compared with the control group, scanning took 53.3 s longer in the MB group and 194.23 s longer in the CB group. In the canine and the first molar, the mean values of errors were compared between the left and right sides; in both the canine and the first molar, errors between the control group and the CB group were the greatest. Conclusions: Following a comparison of the duration and accuracy of the impressions between the three groups, our results suggest that its degree was the highest in the CB group where a monocrystalline bracket was attached.

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Section: Discussionmentioning

confidence: 99%

The Effects of Orthodontic Brackets on the Time and Accuracy of Digital Impression Taking

Heo

Kim

2021

IJERPH

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“… 8 , 9 , 10 Trueness refers to how close the dimensions of the digital image are to the object being scanned, while precision refers to the reproducibility of the same dimensions in subsequent scans. 8 , 9 , 10 It is important to note that the accuracy of an impression can be affected during the data acquisition and digitization steps by the conversion of IDI to various types of file formats: the standard tessellation language (STL), object (OBJ) and polygon (PLY) file formats. 8 Therefore, clinicians should be well informed on the distinct advantages and disadvantages of each file format.…”

Section: Introductionmentioning

confidence: 99%

“… 8 , 9 , 10 It is important to note that the accuracy of an impression can be affected during the data acquisition and digitization steps by the conversion of IDI to various types of file formats: the standard tessellation language (STL), object (OBJ) and polygon (PLY) file formats. 8 Therefore, clinicians should be well informed on the distinct advantages and disadvantages of each file format.…”

Section: Introductionmentioning

confidence: 99%

“…Although its simplistic design allows for files with smaller storage units and time-efficient exporting, the STL file format only captures the surface geometry of the object without any detailed textures or colors, ultimately affecting the trueness of the IDI and the quality of the final restoration. 8 These shortcomings have been overcome with the introduction of OBJ and PLY file formats. PLY and OBJ formats use polygonal geometry (points, lines, and faces) and free-form geometry (curves and surfaces) that allow them to record even the most minute details of the surface of an object, including color, texture coordinates, and transparency.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the relationship between the surface topography of prepared tooth surfaces and data quality of digital impressions from an intraoral scanner

Asar

Yun

Schwartz

et al. 2022

Journal of Dental Sciences

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Background/purpose With the rise of digitalization in dentistry, intraoral scanners and digital impressions have recently been adopted by many clinicians. The aim of this study was to investigate surface topography of prepared teeth and the accuracy of digital impressions. Materials and methods Twenty mandibular typodonts, containing left first premolar and left first molar abutment teeth manufactured by using CAD/CAM, were used in this study. An intraoral scanner was used to scan each typodont, and each STL file generated was exported in high resolution (Group H), moderate resolution (Group M), and low resolution (Group L). All 60 files were inspected in a 3-D mesh processing software. For each file, the number of triangulation points in the meshwork were obtained for both abutment teeth. Results The measurements obtained from the 3-D mesh processing software revealed that the mean number of triangulation points on the 3-D surface of the abutment teeth (20 premolars + 20 M) were 790,625 ± 98,890 dots in Group H, 592,283 ± 74,881 dots in Group M, and 198,067 ± 19,328 dots in Group L. Significant differences were found between Group H and M (p < 0.05), Group H and L (p < 0.001), and Group M and L (p < 0.01). Conclusion The outcomes of this study reveal that there are strong correlations between the data quality of digital impressions and surface topography of prepared teeth. Therefore, the utilization of STL files in high resolution format is the recommended choice for clinicians engaging in a digital workflow process.

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“…The foundation to 3D printing technology is the data acquired from intraoral optical scanners (IOS) and cone beam computed tomography (CBCT) images. 7 This data is then converted into standard tessellation language (STL) where it can be uploaded to 3D modeling software to be manipulated to meet the clinicians manufacturing needs. Following these modifications, clinicians upload the files onto a printer of choice.…”

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confidence: 99%