Model Analysis of Digital Models in Moderate to Severe Crowding: In Vivo Validation and Clinical Application

Yoon, Jae Hee; Yu, Hyung Seog; Choi, Youn Jeong; Choi, Tae-Hyun; Choi, Sung‐Hwan; Yul, Jung

doi:10.1155/2018/8414605

Cited by 22 publications

(21 citation statements)

References 19 publications

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“…Differences between plaster and intraorally scanned models were up to 0.86 mm for maxilla and 0.55 mm for mandible with statistically significant differences. Authors concluded that recorded differences are not clinically significant and that all three methods can be used in practice, regardless of the severity of crowding [26]. Comparison of these results and results presented in our paper indicates that recorded discrepancies between methods are comparable, with the note of no statistically significant difference being present in our results for complete arches.…”

Section: Discussionsupporting

confidence: 71%

“…Pri poređenju merenja na gipsanom modelu i intraoralno skeniranom modelu dobijena prosečna odstupanja su iznosila do 0,86 mm za mak-silu i 0,55 mm za mandibulu, uz pronađene statistički značajne razlike. Autori zaključuju da razlike u merenjima nisu klinički značajne i da je moguća upotreba sva tri metoda u kliničkoj praksi bez obzira na stepen teskobe [26]. Poredeći navedene rezultate sa rezultatima prezentovanim u ovom radu, vidljivo je da su odstupanja približno istih vrednosti, uz razliku da u našem slučaju nije pronađena statistički značajna razlika za cele vilice.…”

Section: Diskusijaunclassified

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Photogrammetry based space analysis measurements in orthodontic diagnosis

Arapović-Savić¹,

Savić²,

Umićević-Davidović³

et al. 2018

Stomatoloski Glasnik Srbije

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Summary Introduction Lundstrom segmental analysis is often used analysis in orthodontic diagnosis. It includes measurements of available and needed space in the arch in order to determine whether there is a lack or excess of space for proper teeth alignment. Measurements are traditionally performed on plaster study models, but with recent developments of computer-based systems, there is an increase in use of digital models in measuring process. The aim of this study was to present a photogrammetry based measurement approach that requires no specialized and expensive hardware and compare results with ones obtained on 3D scanned models. Material and method On 50 plaster study models measurements of 24 teeth, widths of 12 segments and Lundstrom segmental analysis were performed. 3D scanned study models were analyzed in the photogrammetry software Ortho-Photo4D on the set of four photographs of the study model in custom made measurement apparatus. The software corrects for finite distance of the camera and corrects errors due to perspective distortion. Results Statistical analysis performed on obtained measurements provided Bland-Altman plots that strongly suggested high degree of correspondence between the two measurements methods. Discrepancies for maxilla for individual segments were under 0.25 mm with standard deviation of up to 0.16 mm, and less than 1 mm and deviation of up to 0.4 mm for complete arch. For mandible the differences were up to 0.27 mm for segments with 0.15 mm deviation and 0.6 mm for complete arch with up to 0.24 mm deviation. Correlation coefficient was over 0.985 in all cases. Conclusions Both analyzed methods can be equally used in clinical practice.

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Section: Discussionsupporting

confidence: 71%

Section: Diskusijaunclassified

Photogrammetry based space analysis measurements in orthodontic diagnosis

Arapović-Savić¹,

Savić²,

Umićević-Davidović³

et al. 2018

Stomatoloski Glasnik Srbije

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“…Also the malocclusion has an effect on digital orthodontic models measurements. Significant differences in the amount of crowding due to the accumulation of errors were reported [20]. According to Bocklet et.…”

Section: Discussionmentioning

confidence: 99%

Accuracy of intraoral scans in the mixed dentition: a prospective non-randomized comparative clinical trial

Liczmanski

Stamm

Sauerland³

et al. 2020

Head Face Med

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Objective: In-vivo accuracy of intraoral scans of complete mixed dentitions of patients in active treatment have not yet been investigated. The aim was to test the hypothesis that dimensional differences between intraoral scans and conventional alginate impressions in the mixed dentition are clinically irrelevant. Methods: Trial design: Prospective non-randomized comparative clinical trial. Based on sample size calculation 44 evaluable mixed dentition jaws of patients in active orthodontic treatment were included. Each patient received an alginate impression following an intraoral scan (TRIOS® Ortho). Plaster cast was fabricated and scanned with an external scanner (ATOS-SO®). Both STL datasets were analyzed with the 3D inspection and mesh processing software GOM Inspect®. Statistical analysis comprised sample size calculation, t-test as well as nonparametric tests. Results: The absolute mean difference between digital plaster casts and intraoral scans is 0.022 mm ± 0.027 mm (median 0.015 mm). The obtained measurements are in the range of comparable studies on full arch permanent dentitions. Gender, the size of the jaw represented by the dentition stage and upper respectively lower jaw, as well the malocclusion have no effect on the total deviations between digital plaster casts and intraoral scans. Detectable impression errors were bubbles in fissures and marginal ridges as well as incomplete alginate flow and detachment from the tray. Detectable scanning errors were incomplete distal surface of the most distal molar. Conclusion: Dimensional differences between intraoral scans and conventional alginate impressions in the mixed dentition are clinically irrelevant for orthodontic purposes. In all clinical situations of active treatment in the mixed dentition, the intraoral scans are more detailed and less error-prone.

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“…Intraoral scanners (IOS) are used in dentistry as a convenient method of taking impressions [1][2][3][4][5][6]. Orthodontic tooth movement can also be easily evaluated using IOS [7][8]. Through the dental model acquired at the time of re-diagnosis of patients undergoing orthodontic treatment, not only the relationship between the entire dentition and the arch, but also the position of the bracket is reevaluated.…”

Section: Introductionmentioning

confidence: 99%

Scanning Accuracy of Bracket Features and Slot Base Angle in Different Bracket Materials by Four Intraoral Scanners

Shin¹,

Yu²,

Yul³

et al. 2020

Preprint

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Accurate expression of bracket prescription is important for successful orthodontic treatment. The aim of this study was to evaluate the accuracy of digital scan images of brackets produced by four different intraoral scanners (IOSs) in terms of the height, position, and angle of the bracket slot when scanning the surface of dental model attached with bracket materials made from different composition of materials. Brackets made from stainless steel, polycrystalline alumina, composite and composite/stainless steel slot were considered, which have been scanned from 4 different IOSs (Primescan, Trios, CS3600 and i500). SEM images were used as references. Each bracket axis was set in the reference scan image, and the axis was set identically by superimposing with the IOS image, and then only the brackets were divided and analyzed. The difference between the manufacturer's nominal torque and bracket slot base angle was 0.39 in SEM, 1.96 in Primescan, 2.04 in Trios, and 5.21 in CS3600 (P <0.001). The parallelism, which is the difference between the upper and lower angles of the slot wall, was 0.55 in SEM, 7.55 in Primescan, 6.74 in Trios3, 6.59 in CS3600, and 24.95 in i500 (p <0.001). This study evaluated the accuracy of the bracket only and it must be admitted that there is some error in recognizing slots through scanning in general

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Model Analysis of Digital Models in Moderate to Severe Crowding: In Vivo Validation and Clinical Application

Cited by 22 publications

References 19 publications

Photogrammetry based space analysis measurements in orthodontic diagnosis

Photogrammetry based space analysis measurements in orthodontic diagnosis

Accuracy of intraoral scans in the mixed dentition: a prospective non-randomized comparative clinical trial

Scanning Accuracy of Bracket Features and Slot Base Angle in Different Bracket Materials by Four Intraoral Scanners

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