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Limones A, Molinero-Mourelle P, Çakmak G, Abou-Ayash S, Delgado S, Martínez Vázquez de Parga JA, Celemín A. Impact of the superimposition methods and the designated comparison area on accuracy analyses in dentate models. J Dent 2024; 145:104939. [PMID: 38521237 DOI: 10.1016/j.jdent.2024.104939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2023] [Revised: 02/25/2024] [Accepted: 03/12/2024] [Indexed: 03/25/2024] Open
Abstract
OBJECTIVES To measure the impact of superimposition methods and the designated comparison area on accuracy analyses of dentate models using an ISO-recommended 3-dimensional (3D) metrology-grade inspection software (Geomagic Control X; 3D Systems; Rock Hill, South Carolina; USA). MATERIALS AND METHODS A dentate maxillary typodont scanned with a desktop scanner (E4; 3 Shape; Copenhagen; Denmark) and an intraoral scanner (Trios 4; 3 Shape; Copenhagen; Denmark) was used as reference. Eight groups were created based on the core features of each superimposition method: landmark-based alignment (G1); partial area-based alignment (G2); entire tooth area-based alignment (G3); double alignment combining landmark-based alignment with entire tooth area-based alignment (G4); double alignment combining partial area-based alignment with entire tooth area-based alignment (G5); initial automated quick pre-alignment (G6); initial automated precise pre-alignment (G7); and entire model area-based alignment (G8). Diverse variations of each alignment and two regions for accuracy analyses (teeth surface or full model surface) were tested, resulting in a total of thirty-two subgroups (n = 18). The alignment accuracy between experimental and reference meshes was quantified using root mean square (RMS) error as trueness and its repeatability as precision. The descriptive statistics, a factorial repeated measures analysis of variance (ANOVA) and a post hoc Tuckey multiple comparison tests were used to analyze the trueness, and precision (α = 0.05). RESULTS A total of 576 superimpositions were performed. The unique partial area-based superimposition method demonstrated the least precise alignment and was the sole group to exhibit a significant difference (p<.001). Automated initial pre-alignments demonstrated similar accuracy to other superimposition methods (p>.05). Double alignments did not result in accuracy improvement (p>.05). The designated comparison area displayed differences in both trueness (p<.001) and precision (p<.001), leading to an overall discrepancy of 8 ± 4 μm between selecting the teeth surface or full model surface. CONCLUSIONS The superimposition method choice within the tested software did not impact accuracy analyses, except when the alignment relies on a unique and reduced area, such as the palatal rugae, a single tooth, or three adjacent teeth on one side. CLINICAL SIGNIFICANCE The superimposition method choice within the tested ISO-recommended 3D inspection software did not impact accuracy analyses.
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Affiliation(s)
- Alvaro Limones
- Department of Conservative Dentistry and Prosthodontics, Faculty of Odontology, University Complutense of Madrid, Madrid, Spain.
| | - Pedro Molinero-Mourelle
- Department of Conservative Dentistry and Prosthodontics, Faculty of Odontology, University Complutense of Madrid, Madrid, Spain; Department of Reconstructive Dentistry and Gerodontology, University of Bern, Bern, Switzerland.
| | - Gülce Çakmak
- Department of Reconstructive Dentistry and Gerodontology, University of Bern, Bern, Switzerland
| | - Samir Abou-Ayash
- Department of Reconstructive Dentistry and Gerodontology, University of Bern, Bern, Switzerland
| | - Silvia Delgado
- Department of Conservative Dentistry and Prosthodontics, Faculty of Odontology, University Complutense of Madrid, Madrid, Spain
| | | | - Alicia Celemín
- Department of Conservative Dentistry and Prosthodontics, Faculty of Odontology, University Complutense of Madrid, Madrid, Spain
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Limones A, Cascos-Sánchez R, Molinero-Mourelle P, Abou-Ayash S, de Parga JAMV, Celemin A, Gómez-Polo M. Impact of the superimposition methods on accuracy analyses in maxillary complete-arch digital implant investigation. J Dent 2024:105081. [PMID: 38797486 DOI: 10.1016/j.jdent.2024.105081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Revised: 05/10/2024] [Accepted: 05/14/2024] [Indexed: 05/29/2024] Open
Abstract
OBJECTIVES To measure the impact of the superimposition method on accuracy analyses in digital implant research using an ISO-recommended 3-dimensional (3D) metrology-grade inspection software (Geomagic Control X; 3D Systems; Rock Hill, South Carolina; USA). MATERIALS AND METHODS A six-implant edentulous maxillary model was scanned using a desktop scanner (7Series; DentalWings; Montreal, Canada) and an intraoral scanner (TRIOS 4; 3Shape; Copenhagen, Denmark) to generate a reference and an experimental mesh. Thirty experimental STL files were superimposed onto the reference model's STL using the core features of six superimposition methods: initial automated pre-alignment (GI group), landmark-based alignment (G1 group), partial area-based alignment (G2 group), entire area-based alignment (G3 group), and double alignment combining landmark-based alignment with entire model area-based alignment (G4 group) or the scan bodies' surface (G5 group). The groups underwent various alignment variations, resulting in sixteen subgroups (n=30). The alignment accuracy between experimental and reference meshes was quantified by using the root mean square (RMS) error as trueness and its fluctuation as precision. The Kruskal-Wallis test with a subsequent adjusted post-hoc Dunn's pairwise comparison test was used to analyze the data (α = .05). The reliability of the measurements was assessed using the intraclass correlation coefficient (ICC). RESULTS Four hundred and eighty superimpositions were used. No significant differences were found in trueness and precision among the groups (p>.05), except for partial area-based alignment (p<.001). Subgroup analysis showed significant differences for partial area-based alignment considering only one scan body (p<.001). Initial automated alignment was as accurate as landmark-based, partial, or entire area-based alignments (p>.05). Double alignments did not improve alignment accuracy (p>.05). The entire area-based alignment of the scan bodies' surface had the least effect on accuracy analyses. CONCLUSIONS Digital oral implant investigation remains unaffected by the superimposition method when ISO-recommended 3D metrology-grade inspection software is used. At least two scan bodies are needed when considering partial area-based alignments. CLINICAL SIGNIFICANCE The superimposition method choice within the tested ISO-recommended 3D inspection software did not impact accuracy analyses in digital implant investigation.
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Affiliation(s)
- Alvaro Limones
- Department of Conservative Dentistry and Prosthodontics, Faculty of Odontology, University Complutense of Madrid, Madrid, Spain
| | - Rocío Cascos-Sánchez
- Department of Conservative Dentistry and Prosthodontics, Faculty of Odontology, University Complutense of Madrid, Madrid, Spain
| | - Pedro Molinero-Mourelle
- Department of Conservative Dentistry and Prosthodontics, Faculty of Odontology, University Complutense of Madrid, Madrid, Spain; Department of Reconstructive Dentistry and Gerodontology, University of Bern, Bern, Switzerland.
| | - Samir Abou-Ayash
- Department of Reconstructive Dentistry and Gerodontology, University of Bern, Bern, Switzerland
| | | | - Alicia Celemin
- Department of Conservative Dentistry and Prosthodontics, Faculty of Odontology, University Complutense of Madrid, Madrid, Spain
| | - Miguel Gómez-Polo
- Department of Conservative Dentistry and Prosthodontics, Faculty of Odontology, University Complutense of Madrid, Madrid, Spain
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Revilla-León M, Zeitler JM, Kois JC. An overview of the different digital facebow methods for transferring the maxillary cast into the virtual articulator. J ESTHET RESTOR DENT 2024. [PMID: 38778662 DOI: 10.1111/jerd.13264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2024] [Revised: 04/29/2024] [Accepted: 05/03/2024] [Indexed: 05/25/2024]
Abstract
OBJECTIVES The purposes of this study were to classify the described digital facebow techniques for transferring the maxillary cast into the semi-adjustable virtual articulator based on the digital data acquisition technology used and to review the reported accuracy values of the different digital facebow methods described. OVERVIEW Digital data acquisition technologies, including digital photographs, facial scanners, cone beam computed tomography (CBCT) imaging, and jaw tracking systems, can be used to transfer the maxillary cast into the virtual articulator. The reported techniques are reviewed, as well as the reported accuracy values of the different digital facebow methods. CONCLUSIONS Digital photographs can be used to transfer the maxillary cast into the virtual articulator using the true horizontal reference plane, but limited studies have assessed the accuracy of this method. Facial scanning and CBCT techniques can be used to transfer the maxillary cast into the virtual articulator, in which the most frequently selected references planes are the Frankfort horizontal, axis orbital, and true horizontal planes. Studies analyzing the accuracy of the maxillary cast transfer by using facial scanning and CBCT techniques are restricted. Lastly, optical jaw trackers can be selected for transferring the maxillary cast into the virtual articulator by using the axis orbital or true horizontal planes, yet the accuracy of these systems is unknown. CLINICAL IMPLICATIONS Digital data acquisition technologies, including digital photographs, facial scanning methods, CBCTs, and optical jaw tracking systems, can be used to transfer the maxillary cast into the virtual articulator. Studies are needed to assess the accuracy of these digital data acquisition technologies for transferring the maxillary cast into the virtual articulator.
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Affiliation(s)
- Marta Revilla-León
- Department of Restorative Dentistry, School of Dentistry, University of Washington, Seattle, USA
- Kois Center, Seattle, USA
- Department of Prosthodontics, School of Dental Medicine, Tufts University, Boston, USA
| | | | - John C Kois
- Kois Center, Seattle, USA
- Department of Restorative Dentistry, School of Dentistry, University of Washington, Seattle, USA
- Seattle, Washington, USA
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Revilla-León M, Gómez-Polo M, Sailer I, Kois JC, Rokhshad R. An overview of artificial intelligence based applications for assisting digital data acquisition and implant planning procedures. J ESTHET RESTOR DENT 2024. [PMID: 38757761 DOI: 10.1111/jerd.13249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2024] [Revised: 04/29/2024] [Accepted: 04/30/2024] [Indexed: 05/18/2024]
Abstract
OBJECTIVES To provide an overview of the current artificial intelligence (AI) based applications for assisting digital data acquisition and implant planning procedures. OVERVIEW A review of the main AI-based applications integrated into digital data acquisitions technologies (facial scanners (FS), intraoral scanners (IOSs), cone beam computed tomography (CBCT) devices, and jaw trackers) and computer-aided static implant planning programs are provided. CONCLUSIONS The main AI-based application integrated in some FS's programs involves the automatic alignment of facial and intraoral scans for virtual patient integration. The AI-based applications integrated into IOSs programs include scan cleaning, assist scanning, and automatic alignment between the implant scan body with its corresponding CAD object while scanning. The more frequently AI-based applications integrated into the programs of CBCT units involve positioning assistant, noise and artifacts reduction, structures identification and segmentation, airway analysis, and alignment of facial, intraoral, and CBCT scans. Some computer-aided static implant planning programs include patient's digital files, identification, labeling, and segmentation of anatomical structures, mandibular nerve tracing, automatic implant placement, and surgical implant guide design.
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Affiliation(s)
- Marta Revilla-León
- Department of Restorative Dentistry, School of Dentistry, University of Washington, Seattle, Washington, USA
- Research and Digital Dentistry, Kois Center, Seattle, Washington, USA
- Department of Prosthodontics, School of Dental Medicine, Tufts University, Boston, Massachusetts, USA
| | - Miguel Gómez-Polo
- Department of Conservative Dentistry and Prosthodontics, Complutense University of Madrid, Madrid, Spain
- Advanced in Implant-Prosthodontics, School of Dentistry, Complutense University of Madrid, Madrid, Spain
| | - Irena Sailer
- Fixed Prosthodontics and Biomaterials, University Clinic of Dental Medicine, University of Geneva, Geneva, Switzerland
| | - John C Kois
- Kois Center, Seattle, Washington, USA
- Department of Restorative Dentistry, University of Washington, Seattle, Washington, USA
- Private Practice, Seattle, Washington, USA
| | - Rata Rokhshad
- Topic Group Dental Diagnostics and Digital Dentistry, ITU/WHO Focus Group AI on Health, Berlin, Germany
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Revilla-León M, Zeitler JM, Kois JC. Scan body system to translate natural head position and virtual mounting into a 3-dimensional virtual patient: A dental technique. J Prosthet Dent 2024; 131:787-792. [PMID: 35672165 DOI: 10.1016/j.prosdent.2022.04.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Revised: 04/13/2022] [Accepted: 04/13/2022] [Indexed: 10/18/2022]
Abstract
Various techniques have been developed for a 3-dimensional (3D) virtual patient. However, those techniques do not enable the registration of the alignment of the facial and intraoral digital scans, the registration for the mounting on the virtual articulator, and the integration of the natural head position (NHP) together. In the present manuscript, a scan body system is described that assists with the translation of the horizon orientation within the NHP of the patient into a computer-aided design software program. Additionally, the scan body system facilitates the facial and intraoral alignment, as well as the mounting of the maxillary virtual cast on the virtual articulator. This scan body system facilitates the integration of the 3D virtual patient and reduces chair and laboratory time.
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Affiliation(s)
- Marta Revilla-León
- Affiliate Assistant Professor, Graduate Prosthodontics, Department of Restorative Dentistry, School of Dentistry, University of Washington, Seattle, Wash; Director of Research and Digital Dentistry, Kois Center, Seattle, Wash; Adjunct Professor, Department of Prosthodontics, Tufts University, Boston, Mass.
| | | | - John C Kois
- Founder and Director, Kois Center, Seattle, Wash; Affiliate Professor, Graduate Prosthodontics, Department of Restorative Dentistry, University of Washington, Seattle, Wash; Private practice, Seattle, Wash
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Labakoum B, Farhan A, Taleb LB, Mouhsen A, Lyazidi A. Effects of autoclaving and disinfection on 3D surgical guides using LCD technology for dental implant. 3D Print Med 2024; 10:14. [PMID: 38656429 PMCID: PMC11040828 DOI: 10.1186/s41205-024-00214-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2024] [Accepted: 04/04/2024] [Indexed: 04/26/2024] Open
Abstract
BACKGROUND Surgical guides can improve the precision of implant placement and minimize procedural errors and their related complications. This study aims to determine how different disinfection and sterilization methods affect the size changes of drill guide templates and the mechanical properties of 3D-printed surgical guides made with LCD technology. METHODS We produced a total of 100 samples. Forty surgical guides were fabricated to assess the implant drill guides' surface and geometric properties. We subjected sixty samples to mechanical tests to analyze their tensile, flexural, and compressive properties. We classified the samples into four groups based on each analytical method: GC, which served as the control group; GA, which underwent autoclave sterilization at 121 °C (+ 1 bar, 20 min); GB, which underwent autoclave sterilization at 134 °C (+ 2 bar, 10 min); and GL, which underwent disinfection with 70% isopropyl alcohol for 20 min. RESULT The results show that sterilization at 121 °C and 134 °C affects the mechanical and geometric characteristics of the surgical guides, while disinfection with 70% isopropyl alcohol gives better results. CONCLUSION Our study of 3D-printed surgical guides using LCD technology found that sterilization at high temperatures affects the guides' mechanical and geometric properties. Instead, disinfection with 70% isopropyl alcohol is recommended.
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Affiliation(s)
- Badreddine Labakoum
- Radiation-Matter & Instrumentation Laboratory (RMI), Faculty of Science and Technology, University Hassan 1st, Settat, Morocco.
- Health Sciences and Techniques Laboratory, Higher Institute of Health Sciences (ISSS), University Hassan 1st, Settat, Morocco.
| | - Amr Farhan
- Radiation-Matter & Instrumentation Laboratory (RMI), Faculty of Science and Technology, University Hassan 1st, Settat, Morocco
- Health Sciences and Techniques Laboratory, Higher Institute of Health Sciences (ISSS), University Hassan 1st, Settat, Morocco
| | - Lhoucine Ben Taleb
- Radiation-Matter & Instrumentation Laboratory (RMI), Faculty of Science and Technology, University Hassan 1st, Settat, Morocco
| | - Azeddine Mouhsen
- Radiation-Matter & Instrumentation Laboratory (RMI), Faculty of Science and Technology, University Hassan 1st, Settat, Morocco
| | - Aissam Lyazidi
- Radiation-Matter & Instrumentation Laboratory (RMI), Faculty of Science and Technology, University Hassan 1st, Settat, Morocco.
- Health Sciences and Techniques Laboratory, Higher Institute of Health Sciences (ISSS), University Hassan 1st, Settat, Morocco.
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Ochoa-López G, Revilla-León M, Gómez-Polo M. Influence of the ambient color lighting on the accuracy of complete arch implant scans recorded by using two intraoral scanners. J Prosthet Dent 2024:S0022-3913(24)00224-5. [PMID: 38653690 DOI: 10.1016/j.prosdent.2024.03.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Revised: 03/18/2024] [Accepted: 03/21/2024] [Indexed: 04/25/2024]
Abstract
STATEMENT OF PROBLEM The influence of different ambient factors including lighting has been previously studied. However, the influence of ambient color lighting settings on intraoral scanning accuracy remains uncertain. PURPOSE The purpose of this in vitro study was to assess the influence of ambient color lighting on the accuracy of complete arch implant scans recorded by using 2 intraoral scanners (IOSs). MATERIAL AND METHODS An edentulous maxillary cast with 6 implant scan bodies was digitized by using a laboratory scanner (DW-7-140) to obtain a reference file. Two groups were created based on the IOS tested: TRIOS 4 (IOS-1) and i700 (IOS-2). Seven subgroups were developed depending on the ambient color lighting (red, green, blue, yellow, cyan, magenta, and white) (n=15). Scanning accuracy was analyzed by using a metrology software program (Geomagic Control X). The Kruskal-Wallis, 1-way ANOVA, and pairwise comparisons were used to analyze the data (α=.05). RESULTS Significant trueness and precision values were found across the groups (P<.05) and subgroups (P<.05). For IOS-1, blue ambient lighting obtained the best trueness (19.8 ±1.8 µm) (P<.05); in precision, white light (20.8 ±7.3 µm) and blue light (22.1 ±13.5) showed the best results (P<.05). For IOS-2, white light showed the best trueness (51.9 ±16.7 µm); the best precision was obtained under magenta (38.6 ±10.4 µm) and yellow light (52.6 ±24.0 µm) (P<.05). CONCLUSIONS The optimal ambient color lighting varied between the IOSs assessed. As the best condition for maximizing accuracy was not found, ambient color lighting must be individualized for the IOS system used.
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Affiliation(s)
- Gastón Ochoa-López
- PhD Candidate, Department of Prosthodontics and Restorative Dentistry, School of Dentistry, Complutense University of Madrid (UCM), Madrid, Spain
| | - Marta Revilla-León
- Affiliate Assistant Professor, Graduate Prosthodontics, Department of Restorative Dentistry, School of Dentistry, University of Washington, Seattle, Wash.; Director, Research and Digital Dentistry, Kois Center, Seattle, Wash.; and Researcher, Revilla Research Center, Madrid, Spain
| | - Miguel Gómez-Polo
- Associate Professor, Department of Conservative Dentistry and Prosthodontics, School of Dentistry, Complutense University of Madrid (UCM), Madrid, Spain; and Director, Postgraduate Program (Specialist in Advanced Implant-Prosthesis), Complutense University of Madrid (UCM), Madrid, Spain.
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Revilla-León M, Zeitler JM, Strommer S, Barmak AB, Kois JC. Accuracy comparison of the maxillary cast transfer into the virtual semi-adjustable articulator between an analog facebow record and a digital photography technique. J Prosthet Dent 2024:S0022-3913(24)00188-4. [PMID: 38609764 DOI: 10.1016/j.prosdent.2024.03.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Revised: 02/28/2024] [Accepted: 03/01/2024] [Indexed: 04/14/2024]
Abstract
STATEMENT OF PROBLEM Digital photographs can be used for transferring the maxillary cast into the virtual semi-adjustable articulator; however, its accuracy remains unknown. PURPOSE The purpose of the present study was to compare the accuracy of the maxillary cast transfer into the virtual semi-adjustable articulator by using an analog and a digital standardized photography technique. MATERIAL AND METHODS A maxillary cast was digitized (T710) and positioned into a dental mannequin. The dental midline was not coincident with the facial midline and the maxillary occlusal plane was tilted. A reference scan of the assembled mannequin was obtained by using a facial scanner (Instarisa). Two groups were created based on the technique used to transfer the maxillary cast into the articulator (Panadent PCH): conventional facebow record (CNV group) or digital photograph (Photo group) (n=10). In the CNV group, facebow records (Kois Dentofacial analyzer system) were digitized (T710) and used to transfer the maxillary scan into the articulator by aligning it with the reference platform (Kois adjustable platform). In the Photo group, photographs with a reference glasses (Kois Reference Glasses) positioned into the mannequin were acquired. Each photograph was aligned with the maxillary scan. Then, the maxillary scan was transferred into the articulator by using the true horizontal axis information contained in the photograph. On the reference scan and each specimen, 10 linear measurements between the buccal cusps of the maxillary scan and the horizontal plane of the virtual articulator and a linear measurement between the maxillary dental midline and articulator midline were calculated. The measurements of the reference scan were used as a control to compute trueness and precision. Trueness was analyzed by using 1-way ANOVA followed by the pairwise comparison Tukey test (α=.05). Precision was evaluated by using the Levene and Wilcoxon Rank sum tests (α=.05). RESULTS The overall discrepancy measured in the CNV group was 0.620 ±0.396 mm, while in the Photo group it was 1.282 ±0.118 mm. Significant trueness differences were found in the midline (P=.037), anterior (P=.050), posterior right (P<.001), posterior left (P=.012), and overall discrepancy (P<.001) between the CNV and Photo groups. Significant precision discrepancies were found in the midline (P=.012), posterior right (P<.001), anterior (P<.001), posterior left (P=.002), and overall discrepancy (P<.001) between the CNV and Photo groups. CONCLUSIONS The facebow record method impacted the accuracy of the maxillary cast transfer. The Photo group obtained better trueness in the midline transfer than the CNV group; however, the CNV group demonstrated better trueness in the anterior, posterior right, posterior left, and overall discrepancy of the maxillary cast transfer compared with the Photo group. Overall, the Photo group obtained better precision than the CNV group.
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Affiliation(s)
- Marta Revilla-León
- Affiliate Assistant Professor, Graduate Prosthodontics, Department of Restorative Dentistry, School of Dentistry, University of Washington, Seattle, Wash; Faculty and Director, Research and Digital Dentistry, Kois Center, Seattle, Wash; and Adjunct Professor, Graduate Prosthodontics, Department of Prosthodontics, School of Dental Medicine, Tufts University, Boston, Mass.
| | | | | | - Abdul B Barmak
- Associate Professor, Clinical Research and Biostatistics, Eastman Institute of Oral Health, University of Rochester Medical Center, Rochester, NY
| | - John C Kois
- Founder and Director, Kois Center, Seattle, Wash.; Affiliate Professor, Graduate Prosthodontics, Department of Restorative Dentistry, University of Washington, Seattle, Wash.; and Private practice, Seattle, Wash
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Ye H, Ye J, Wang S, Wang Z, Geng J, Wang Y, Liu Y, Sun Y, Zhou Y. Comparison of the accuracy (trueness and precision) of virtual dentofacial patients digitized by three different methods based on 3D facial and dental images. J Prosthet Dent 2024; 131:726-734. [PMID: 35369981 DOI: 10.1016/j.prosdent.2022.01.035] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 01/18/2022] [Accepted: 01/19/2022] [Indexed: 10/18/2022]
Abstract
STATEMENT OF PROBLEM The accuracy of virtual dentofacial patients has been explored, but the accuracy of virtual patients established by using a straightforward and reliable method and the accuracy of different virtual patients are unclear. PURPOSE The purpose of this clinical study was to compare the accuracy of virtual dentofacial patients digitized by using registered-block impression, exposed anterior teeth, and cone beam computed tomography (CBCT) reconstruction methods based on 3-dimensional (3D) facial and dental images. MATERIAL AND METHODS From the 15 selected participants who needed CBCT scanning, 3 kinds of virtual dentofacial patients were established by using 3 registration methods based on digital dental casts: 3D facial images, CBCT data, and registered-block impression. Compared with actual measurement, 25 linear distances of all virtual dentofacial patients were selected and measured by using a software program, and 3 separate measurements were calculated by the same person. The 1-way analysis of variance (ANOVA) was used to compare the deviations among 3 kinds of virtual dentofacial patients (trueness) and the deviations within groups (precision). The 1-sample t test was used to compare the difference between the deviation and the ideal error of 0.00 (α=.05). RESULTS Compared with the actual measurement, the trueness of the average deviations for registered-block impression (1.02 ±1.24 mm) was better than that of exposed anterior teeth (2.35 ±1.71 mm) and CBCT reconstruction (2.86 ±1.61 mm). The precision of the average deviations for registered-block impression (1.29 ±1.43 mm) was better than that of exposed anterior teeth (2.00 ±1.72 mm) and CBCT reconstruction (2.12 ±1.94 mm). Significant differences in trueness and precision were found among the 3 groups of virtual dentofacial patients (P<.01). Significant differences among the deviations of all linear distances and the ideal error of 0.00 were observed for all groups of virtual dentofacial patients (P<.05). CONCLUSIONS The accuracy of registered-block impression was better than that of the exposed anterior teeth and CBCT reconstruction. The accuracy of exposed anterior teeth was lower than that of the other methods but could satisfy the requirements of clinical diagnostics and scientific methods. The accuracy of CBCT reconstruction was poor and could only be used for special situations that permitted low accuracy.
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Affiliation(s)
- Hongqiang Ye
- Associate Professor, Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases &National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology, Beijing, PR China
| | - Jiahui Ye
- Graduate student, Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases &National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology, Beijing, PR China
| | - Shimin Wang
- Dental Technician, Center of dental Laboratory, Peking University School and Hospital of Stomatology, Beijing, PR China
| | - Zixuan Wang
- Dental Technician, Center of dental Laboratory, Peking University School and Hospital of Stomatology, Beijing, PR China
| | - Jing Geng
- Graduate student, Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing, PR China
| | - Yiqing Wang
- Graduate student, Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, PR China
| | - Yunsong Liu
- Professor, Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, PR China
| | - Yuchun Sun
- Professor, Center of Digital Dentistry, Peking University School and Hospital of Stomatology, Beijing, PR China
| | - Yongsheng Zhou
- Professor, Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases &National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology, Beijing, PR China.
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Palaszkó D, Németh A, Török G, Vecsei B, Vánkos B, Dinya E, Borbély J, Marada G, Hermann P, Kispélyi B. Trueness of five different 3D printing systems including budget- and professional-grade printers: An In vitro study. Heliyon 2024; 10:e26874. [PMID: 38468926 PMCID: PMC10925989 DOI: 10.1016/j.heliyon.2024.e26874] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2023] [Revised: 02/20/2024] [Accepted: 02/21/2024] [Indexed: 03/13/2024] Open
Abstract
Problem Several types of 3D printers with different techniques and prices are available on the market. However, results in the literature are inconsistent, and there is no comprehensive agreement on the accuracy of 3D printers of different price categories for dental applications. Aim This study aimed to investigate the accuracy of five different 3D printing systems, including a comparison of budget- and higher-end 3D printing systems, according to a standardized production and evaluation protocol. Material and methods A maxillary reference model with prepared teeth was created using 16 half-ball markers with a diameter of 1 mm to facilitate measurements. A reference file was fabricated using five different 3D printers. The printed models were scanned and superimposed onto the original standard tesselation language (.stl) file, and digital measurements were performed to assess the 3-dimensional and linear deviations between the reference and test models. Results After examining the entire surface of the models, we found that 3D printers using Fused filament fabrication (FFF) technology -120.2 (20.3) μm create models with high trueness but high distortion. Distortions along the z-axis were found to be the highest with the stereolithography (SLA)-type 3D printer at -153.7 (38.7) μm. For the 4-unit FPD, we found 201.9 (41.8) μm deviation with the digital light processing (DLP) printer. The largest deviation (-265.1 (55.4) μm) between the second molars was observed for the DLP printer. Between the incisor and the second molar, the best results were produced by the FFF printer with -30.5 (76.7) μm. Conclusion Budget-friendly 3D printers are comparable to professional-grade printers in terms of precision. In general, the cost of a printing system is not a reliable indicator of its level of accuracy.
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Affiliation(s)
- Dénes Palaszkó
- Department of Prosthodontics, Faculty of Dentistry, Semmelweis University, Budapest, Hungary
| | - Anna Németh
- Department of Prosthodontics, Faculty of Dentistry, Semmelweis University, Budapest, Hungary
| | - Gréta Török
- Department of Prosthodontics, Faculty of Dentistry, Semmelweis University, Budapest, Hungary
| | - Bálint Vecsei
- Department of Prosthodontics, Faculty of Dentistry, Semmelweis University, Budapest, Hungary
| | - Boldizsár Vánkos
- Department of Prosthodontics, Faculty of Dentistry, Semmelweis University, Budapest, Hungary
| | - Elek Dinya
- Institute of Digital Health Sciences, Semmelweis University, Budapest, Hungary
| | - Judit Borbély
- Department of Prosthodontics, Faculty of Dentistry, Semmelweis University, Budapest, Hungary
| | | | - Péter Hermann
- Department of Prosthodontics, Faculty of Dentistry, Semmelweis University, Budapest, Hungary
| | - Barbara Kispélyi
- Department of Prosthodontics, Faculty of Dentistry, Semmelweis University, Budapest, Hungary
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11
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Wei L, Wu S, Huang Z, Chen Y, Zheng H, Wang L. Autologous Transplantation Tooth Guide Design Based on Deep Learning. J Oral Maxillofac Surg 2024; 82:314-324. [PMID: 37832596 DOI: 10.1016/j.joms.2023.09.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2023] [Revised: 09/14/2023] [Accepted: 09/14/2023] [Indexed: 10/15/2023]
Abstract
BACKGROUND Autologous tooth transplantation requires precise surgical guide design, involving manual tracing of donor tooth contours based on patient cone-beam computed tomography (CBCT) scans. While manual corrections are time-consuming and prone to human errors, deep learning-based approaches show promise in reducing labor and time costs while minimizing errors. However, the application of deep learning techniques in this particular field is yet to be investigated. PURPOSE We aimed to assess the feasibility of replacing the traditional design pipeline with a deep learning-enabled autologous tooth transplantation guide design pipeline. STUDY DESIGN, SETTING, SAMPLE This retrospective cross-sectional study used 79 CBCT images collected at the Guangzhou Medical University Hospital between October 2022 and March 2023. Following preprocessing, a total of 5,070 region of interest images were extracted from 79 CBCT images. PREDICTOR VARIABLE Autologous tooth transplantation guide design pipelines, either based on traditional manual design or deep learning-based design. MAIN OUTCOME VARIABLE The main outcome variable was the error between the reconstructed model and the gold standard benchmark. We used the third molar extracted clinically as the gold standard and leveraged it as the benchmark for evaluating our reconstructed models from different design pipelines. Both trueness and accuracy were used to evaluate this error. Trueness was assessed using the root mean square (RMS), and accuracy was measured using the standard deviation. The secondary outcome variable was the pipeline efficiency, assessed based on the time cost. Time cost refers to the amount of time required to acquire the third molar model using the pipeline. ANALYSES Data were analyzed using the Kruskal-Wallis test. Statistical significance was set at P < .05. RESULTS In the surface matching comparison for different reconstructed models, the deep learning group achieved the lowest RMS value (0.335 ± 0.066 mm). There were no significant differences in RMS values between manual design by a senior doctor and deep learning-based design (P = .688), and the standard deviation values did not differ among the 3 groups (P = .103). The deep learning-based design pipeline (0.017 ± 0.001 minutes) provided a faster assessment compared to the manual design pipeline by both senior (19.676 ± 2.386 minutes) and junior doctors (30.613 ± 6.571 minutes) (P < .001). CONCLUSIONS AND RELEVANCE The deep learning-based automatic pipeline exhibited similar performance in surgical guide design for autogenous tooth transplantation compared to manual design by senior doctors, and it minimized time costs.
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Affiliation(s)
- Lifen Wei
- Department of Dental Implantation, Affiliated Stomatology Hospital of Guangzhou Medical University, Guangdong Engineering Research Center of Oral Restoration and Reconstruction, Guangzhou Key Laboratory of Basic and Applied Research of Oral Regenerative Medicine, Guangzhou, Guangdong, China
| | - Shuyang Wu
- Department of Pathology, Collaborative Innovation Center for Cancer Medicine, State Key Laboratory of Oncology in South China, Sun Yat-sen University Cancer Center, Guangzhou, Guangdong, China
| | - Zelun Huang
- Department of Dental Implantation, Affiliated Stomatology Hospital of Guangzhou Medical University, Guangdong Engineering Research Center of Oral Restoration and Reconstruction, Guangzhou Key Laboratory of Basic and Applied Research of Oral Regenerative Medicine, Guangzhou, Guangdong, China
| | - Yaxin Chen
- Department of Dental Implantation, Affiliated Stomatology Hospital of Guangzhou Medical University, Guangdong Engineering Research Center of Oral Restoration and Reconstruction, Guangzhou Key Laboratory of Basic and Applied Research of Oral Regenerative Medicine, Guangzhou, Guangdong, China
| | - Haoran Zheng
- Department of Chemical & Materials Engineering, University of Auckland, Auckland, New Zealand
| | - Liping Wang
- Department of Dental Implantation, Affiliated Stomatology Hospital of Guangzhou Medical University, Guangdong Engineering Research Center of Oral Restoration and Reconstruction, Guangzhou Key Laboratory of Basic and Applied Research of Oral Regenerative Medicine, Guangzhou, Guangdong, China.
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12
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Wang X, Zhang F, Ma D, Ye X, Zheng X, Ren R, Bai S. Coordinate-based data analysis of the accuracy of five intraoral scanners for scanning completely dentate and partially edentulous mandibular arches. J Prosthet Dent 2024:S0022-3913(24)00010-6. [PMID: 38342644 DOI: 10.1016/j.prosdent.2024.01.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 01/08/2024] [Accepted: 01/10/2024] [Indexed: 02/13/2024]
Abstract
STATEMENT OF PROBLEM Current methods for assessing the accuracy of intraoral scanners (IOSs) that reduce errors and provide comprehensive data compared with previous methods are lacking. PURPOSE The purpose of this in vitro study was to present a coordinate-based data analysis method to compare the accuracy of 5 IOSs for scanning completely dentate and partially edentulous casts. MATERIAL AND METHODS Reference scans of 2 complete arch casts (completely and partially dentate) were digitized using a high-precision laboratory scanner (Ceramill Map 600). Each cast was scanned 10 times each using 5 IOSs (3Shape TRIOS 3, Planmeca Emerald, iTero Element 5D, Medit i500, and Shining Aoralscan 3). The dataset of all 10 test groups was analyzed by using a reverse engineering software program (Geomagic Wrap). Each test cast was aligned with the reference cast by 3-dimensional (3D) superimposition to determine the translation and rotation along the x-, y-, and z-axes. The dataset was analyzed using the Kruskal-Wallis and post hoc Bonferroni tests (α=.05). RESULTS Significant differences were observed in all parameters among all scanners when scanning the same cast (P<.05). Significant differences were observed in at least 1 parameter for all scanners, except Element 5D after scanning different casts using the same scanner. Deviations in the test data generally relocated toward the mesial, buccal, and apical sides, and the casts were almost always rotated clockwise around the y-axis and counterclockwise around the z-axis. For the completely dentate cast, among all IOSs, Element 5D demonstrated the highest accuracy in most of the measured parameters, specifically in the y-axis translation (0.06[0.07] mm), z-axis translation (0.08[0.05] mm), and y-axis rotation (0.21[0.16] degree) (P<.05). For the partially edentulous cast, Element 5D displayed higher accuracy in most of the measured parameters, including the x-axis translation (0.11[0.14] mm) and z-axis rotation (0.12[0.18] degree) (P<.05). Emerald also displayed higher accuracy in most of the measured parameters, including the y-axis translation (0.05[0.08] mm) and y-axis rotation (0.14[0.12] degree) (P<.05). Element 5D exhibited no difference in the scanning accuracy between the 2 types of casts (P>.05). CONCLUSIONS Element 5D offered a high level of accuracy and was an appropriate scanner for both situations. The method presented in this study provides a good assessment of accuracy deviations in complete arch scans using 3D coordinate-based data analysis.
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Affiliation(s)
- Xin Wang
- Graduated Student, State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, National Clinical Research Center for Oral Diseases, Shaanxi Key Laboratory of Stomatology, Digital Dentistry Center, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, PR China
| | - Fang Zhang
- Dental Technologist, State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, National Clinical Research Center for Oral Diseases, Shaanxi Key Laboratory of Stomatology, Digital Dentistry Center, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, PR China
| | - Dan Ma
- Graduated Student, State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, National Clinical Research Center for Oral Diseases, Shaanxi Key Laboratory of Stomatology, Digital Dentistry Center, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, PR China
| | - Xiaolan Ye
- Dental Technologist, State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, National Clinical Research Center for Oral Diseases, Shaanxi Key Laboratory of Stomatology, Digital Dentistry Center, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, PR China
| | - Xiaojuan Zheng
- Dental Nurse, State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, National Clinical Research Center for Oral Diseases, Shaanxi Key Laboratory of Stomatology, Digital Dentistry Center, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, PR China
| | - Ruifang Ren
- Dental Technologist, State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, National Clinical Research Center for Oral Diseases, Shaanxi Key Laboratory of Stomatology, Digital Dentistry Center, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, PR China
| | - Shizhu Bai
- Associate Professor, State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, National Clinical Research Center for Oral Diseases, Shaanxi Key Laboratory of Stomatology, Digital Dentistry Center, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, PR China.
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13
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Ritschl LM, Classen C, Kilbertus P, Eufinger J, Storck K, Fichter AM, Wolff KD, Grill FD. Comparison of three-dimensional imaging of the nose using three different 3D-photography systems: an observational study. Head Face Med 2024; 20:7. [PMID: 38267982 PMCID: PMC10807178 DOI: 10.1186/s13005-024-00406-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Accepted: 01/04/2024] [Indexed: 01/26/2024] Open
Abstract
BACKGROUND New 3D technologies for superficial soft tissue changes, especially in plastic and reconstructive surgical procedures, can improve the planning and documentation of facial surgeries. The purpose of this study was to compare and determine the applicability and feasibility of three different 3D-photography systems in clinical practice imaging the nose. METHODS A total of 16 healthy non-operated noses were included in this prospective study. A plaster model of each nose was produced, digitized, and converted to a .stl mesh (= ground truth model). Three-dimensional images of each nose were then taken using Artec Space Spider (gold standard), Planmeca ProFace®, and the Bellus3D Dental Pro application. All resulting .stl files were aligned to the ground truth model using MeshLab software, and the root mean square error (RMSE), mean surface distance (MSD), and Hausdorff distance (HD) were calculated. RESULTS The Artec Space Spider 3D-photography system showed significantly better results compared to the two other systems in regard to RMSE, MSD, and HD (each p < 0.001). There was no significant difference between Planmeca ProFace® and Bellus3D Dental Pro in terms of RMSE, MSD, and HD. Overall, all three camera systems showed a clinically acceptable deviation to the reference model (range: -1.23-1.57 mm). CONCLUSIONS The three evaluated 3D-photography systems were suitable for nose imaging in the clinical routine. While Artec Space Spider showed the highest accuracy, the Bellus3D Dental Pro app may be the most feasible option for everyday clinical use due to its portability, ease of use, and low cost. This study presents three different systems, allowing readers to extrapolate to other systems when planning to introduce 3D photography in the clinical routine.
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Affiliation(s)
- Lucas M Ritschl
- Department of Oral and Maxillofacial Surgery, School of Medicine and Health, Technical University of Munich, Klinikum rechts der Isar, Ismaninger Strasse 22, D-81675, Munich, Germany
| | - Carolina Classen
- Department of Oral and Maxillofacial Surgery, School of Medicine and Health, Technical University of Munich, Klinikum rechts der Isar, Ismaninger Strasse 22, D-81675, Munich, Germany.
- Department of Oral and Maxillofacial Surgery, Saarland University Medical Centre, 66421, Homburg, Germany.
| | - Paul Kilbertus
- Department of Oral and Maxillofacial Surgery, School of Medicine and Health, Technical University of Munich, Klinikum rechts der Isar, Ismaninger Strasse 22, D-81675, Munich, Germany
| | - Julia Eufinger
- Department of Oral and Maxillofacial Surgery, School of Medicine and Health, Technical University of Munich, Klinikum rechts der Isar, Ismaninger Strasse 22, D-81675, Munich, Germany
| | - Katharina Storck
- Department of Otorhinolaryngology, Head and Neck Surgery, School of Medicine and Health, Technical University of Munich, Klinikum rechts der Isar, Ismaninger Strasse 22, D-81675, Munich, Germany
| | - Andreas M Fichter
- Department of Oral and Maxillofacial Surgery, School of Medicine and Health, Technical University of Munich, Klinikum rechts der Isar, Ismaninger Strasse 22, D-81675, Munich, Germany
| | - Klaus-Dietrich Wolff
- Department of Oral and Maxillofacial Surgery, School of Medicine and Health, Technical University of Munich, Klinikum rechts der Isar, Ismaninger Strasse 22, D-81675, Munich, Germany
| | - Florian D Grill
- Department of Oral and Maxillofacial Surgery, School of Medicine and Health, Technical University of Munich, Klinikum rechts der Isar, Ismaninger Strasse 22, D-81675, Munich, Germany
- Private Practice Oral and Maxillofacial Surgery, Wolfratshausen, Germany
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14
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Rosmaninho A, Zeitler JM, Vedovato E, Kois JC, Revilla-León M. Using an additively manufactured natural head position reference device to transfer the horizon orientation plane and integrate it with a 3-dimensional virtual patient: A dental technique. J Prosthet Dent 2024; 131:7-12. [PMID: 35382942 DOI: 10.1016/j.prosdent.2022.02.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 02/14/2022] [Accepted: 02/15/2022] [Indexed: 10/18/2022]
Abstract
A virtual patient is obtained by aligning a patient's digital information, including facial and intraoral digital scans with or without hard tissue information from a cone beam computed tomography scan. However, while computer-aided design programs facilitate virtual patient integration, they do not provide a way to relate the horizon orientation with the patient's horizontal and vertical facial references. The present technique describes a way of relating the horizon orientation plane to the natural head position of the patient. An additively manufactured natural head position reference device was used to transfer the horizon orientation plane to the 3-dimensional virtual patient.
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Affiliation(s)
| | | | | | - John C Kois
- Founder and Director Kois Center, Seattle, Wash; Affiliate Professor, Graduate Prosthodontics, Department of Restorative Dentistry, University of Washington, Seattle, Wash; Private Practice, Seattle, Wash
| | - Marta Revilla-León
- Affiliate Assistant Professor, Graduate Prosthodontics, Department of Restorative Dentistry, School of Dentistry, University of Washington, Seattle, Wash; Director of Research and Digital Dentistry, Kois Center, Seattle, Wash; Adjunct Professor, Department of Prosthodontics, Tufts University, Boston, Mass.
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15
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Akl MA, Daifallah K, Pérez-Barquero JA, Barmak AB, Wee AG, Revilla-León M. Influence of interdental spaces and the palate on the accuracy of maxillary scans acquired using different intraoral scanners. J Prosthodont 2023; 32:125-134. [PMID: 37591814 DOI: 10.1111/jopr.13748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 06/26/2023] [Accepted: 07/06/2023] [Indexed: 08/19/2023] Open
Abstract
PURPOSE To assess the influence of interdental spaces and scanning the palate on the accuracy of maxillary scans acquired using three intraoral scanners (IOSs). MATERIALS AND METHODS A virtual completely dentate maxillary cast without interdental spaces was obtained and modified to create 1, 2, and 3 mm of interdental spacing between the anterior teeth. These three files (reference standard tessellation language files) were used to print three reference casts. The reference casts were scanned using three IOSs: TRIOS4, iTero Element 5D, and Aoralscan2. Three groups were created based on the interdental spaces: 0, 1, 2, and 3 mm (n = 10). The groups were subdivided into two subgroups: no palate (NP subgroup) and palate (P subgroup). The reference STL files were used to measure the discrepancy with the experimental scans by calculating the root mean square (RMS) error. Three-way analysis of variance (ANOVA) and post hoc Tukey pairwise comparison tests were used to analyze trueness. The Levene test was used to analyze precision (α = 0.05). RESULTS Trueness ranged from 91 to 139 μm and precision ranged from 5 to 23 μm among the subgroups tested. A significant correlation was found between IOS*group (p<0.001) and IOS*subgroup ( p<0.001). Tukey test showed significant trueness differences among the interdental spaces tested (p<0.001). The 1- and 2-mm groups obtained better trueness than the 0- and 3-mm groups (p<0.001). An 11 μm mean trueness discrepancy was measured among the different interdental space groups tested. The P subgroups demonstrated significantly higher trueness when compared to the NP subgroups (p<0.001). The discrepancy between the maxillary scans with and without the palate was 4 μm. Significant precision discrepancies were found (p = 0.008), with the iTero group showing the lowest precision. CONCLUSION Interdental spaces and incorporation of the palate on maxillary intraoral scans influenced trueness and precision of the three IOSs tested. However, the scanning discrepancy measured may be of no clinical relevance.
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Affiliation(s)
- Mohammed A Akl
- Woody L. Hunt School of Dental Medicine, Texas Tech University Health Sciences Center El Paso, El Paso, Texas, United States
| | - Khaled Daifallah
- Division of Prosthodontics, Department of Restorative Sciences, School of Dentistry, University of Minnesota, Minneapolis, Minnesota, USA
| | | | - Abdul B Barmak
- Eastman Institute of Oral Health, University of Rochester Medical Center, Rochester, New York, USA
| | - Alvin G Wee
- Division of Prosthodontics, Department of Restorative Sciences, School of Dentistry, University of Minnesota, Minneapolis, Minnesota, USA
| | - Marta Revilla-León
- Department of Restorative Dentistry, School of Dentistry, University of Washington, Seattle, Washington, USA
- Kois Center, Seattle, Washington, USA
- Department of Prosthodontics, School of Dental Medicine, Tufts University, Boston, Massachusetts, USA
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16
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Cao R, Zhang S, Li L, Qiu P, Xu H, Cao Y. Accuracy of intraoral scanning versus conventional impressions for partial edentulous patients with maxillary defects. Sci Rep 2023; 13:16773. [PMID: 37798354 PMCID: PMC10556061 DOI: 10.1038/s41598-023-44033-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Accepted: 10/03/2023] [Indexed: 10/07/2023] Open
Abstract
This study aimed to evaluate the accuracy of digital dental impressions obtained by intraoral scanning (IOS) for partial edentulous patients with maxillary defects by comparing them with conventional impression techniques. Ten subjects underwent an experimental procedure where three ceramic blocks were affixed to the healthy palate mucosa. Digital dental impressions were captured using IOS and subsequently imported into software. Conventional impressions obtained by silicone rubber were also taken and scanned. Linear distance and best-fit algorithm measurements were performed using conventional impression techniques as the reference. Twenty impressions were analyzed, which included 30 pairs of linear distances and 10 best-fit algorithm measurements. Regarding linear distance, paired two-sample t-test demonstrated no significant differences between IOS and model scanning in groups A and C, whereas significant differences were found in group B (P < 0.05). Additionally, ANOVA revealed significant differences among the groups (P < 0.05). No significant differences were found for the best-fit algorithm measurement of the dentition. IOS can provide accurate impressions for partial edentulous patients with maxillary defects and its accuracy was found to be comparable with conventional impression techniques. A functional impression may be needed to ensure accurate reproduction of soft and hard tissues in defect or flap areas.
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Affiliation(s)
- Rongkai Cao
- Department of Stomatology, The First Affiliated Hospital, Fujian Medical University, No. 20, Chazhong Rd, Fuzhou, 350005, Fujian, China
- School & Hospital of Stomatology, Shanghai Engineering Research Center of Tooth Restoration and Regeneration, Tongji University, Shanghai, 200072, China
| | - Shilei Zhang
- Department of Stomatology, The First Affiliated Hospital, Fujian Medical University, No. 20, Chazhong Rd, Fuzhou, 350005, Fujian, China
- General Dentistry, Stomatological Hospital of Xiamen Medical College, Xiamen, 361008, China
| | - Lishan Li
- Department of Stomatology, The First Affiliated Hospital, Fujian Medical University, No. 20, Chazhong Rd, Fuzhou, 350005, Fujian, China
- Department of Stomatology, National Regional Medical Center, Binhai Campus of the First Affiliated Hospital, Fujian Medical University, Fuzhou, 350212, China
| | - Piaopiao Qiu
- School & Hospital of Stomatology, Shanghai Engineering Research Center of Tooth Restoration and Regeneration, Tongji University, Shanghai, 200072, China
| | - Hui Xu
- School & Hospital of Stomatology, Shanghai Engineering Research Center of Tooth Restoration and Regeneration, Tongji University, Shanghai, 200072, China
| | - Yujie Cao
- Department of Stomatology, The First Affiliated Hospital, Fujian Medical University, No. 20, Chazhong Rd, Fuzhou, 350005, Fujian, China.
- Department of Stomatology, National Regional Medical Center, Binhai Campus of the First Affiliated Hospital, Fujian Medical University, Fuzhou, 350212, China.
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Revilla-León M, Fry E, Supaphakorn A, Barmak AB, Kois JC. Manufacturing accuracy of the intaglio surface of definitive resin-ceramic crowns fabricated at different print orientations by using a stereolithography printer. J Prosthet Dent 2023:S0022-3913(23)00267-6. [PMID: 37246096 DOI: 10.1016/j.prosdent.2023.04.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 04/11/2023] [Accepted: 04/12/2023] [Indexed: 05/30/2023]
Abstract
STATEMENT OF PROBLEM Stereolithography (SLA) procedures can be chosen for manufacturing definitive crowns; however, how the print orientation impacts the trueness and precision of the intaglio surface of the printed definitive restorations is unclear. PURPOSE The purpose of this in vitro investigation was to calculate the manufacturing accuracy of the intaglio surface of SLA definitive resin-ceramic crowns fabricated at varying print orientations (0, 45, 75, or 90 degrees). MATERIAL AND METHODS The standard tessellation language (STL) file of an anatomic contour molar crown was obtained and used to fabricate all the crowns by using a definitive resin-ceramic material (Permanent Crown) and an SLA printer (Form 3B+). Four groups were developed depending on the print orientation selected to manufacture the crowns: 0-, 45-, 70-, and 90-degree print orientation (n=30). Each crown specimen was digitized without the use of scanning powder by using a desktop scanner (T710). The crown design file was determined as the reference (control) group and used to calculate the fabricating trueness and precision of the intaglio surface of the specimens using the root mean square (RMS) error computation. Trueness data were examined by using 1-way ANOVA and post hoc pairwise multiple comparison Tukey tests, while precision data were analyzed using the Levene test (α=.05). RESULTS The mean ±standard deviation RMS error discrepancies ranged from 37 ±3 μm to 113 ±11 μm. One-way ANOVA exposed significant trueness (P<.001) differences among the groups considered in this study. Furthermore, all the print orientation groups tested were different from each other (P<.001). The 0-degree group presented the best trueness value (37 μm), while the 90-degree group obtained the worst trueness value (113 μm). The Levene test exposed significant precision differences among the groups assessed (P<.001). The 0-degree group had a significantly lower standard deviation (higher precision) (3 μm) than the other groups, with no difference among the other groups tested (P>.05). CONCLUSIONS The fabricating trueness and precision of the intaglio surface of the SLA resin-ceramic crowns was impacted by the varying print orientations assessed.
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Affiliation(s)
- Marta Revilla-León
- Affiliate Assistant Professor, Graduate Prosthodontics, Department of Restorative Dentistry, School of Dentistry, University of Washington, Seattle, Wash; Faculty and Director of Research and Digital Dentistry, Kois Center, Seattle, Wash; and Adjunct Professor, Department of Prosthodontics, School of Dental Medicine, Tufts University, Boston, Mass.
| | - Elisabeth Fry
- Director of Clinical Operations, Kois Center, Seattle, Wash
| | | | - Abdul B Barmak
- Assistant Professor, Clinical Research and Biostatistics, Eastman Institute of Oral Health, University of Rochester Medical Center, Rochester, NY
| | - John C Kois
- Director, Kois Center, Seattle, Wash; Affiliate Professor, Graduate in Prosthodontics, Department of Restorative Dentistry, School of Dentistry, University of Washington, Seattle, Wash; and Private Practice, Seattle, Wash
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Németh A, Vitai V, Czumbel ML, Szabó B, Varga G, Kerémi B, Hegyi P, Hermann P, Borbély J. Clear guidance to select the most accurate technologies for 3D printing dental models - A network meta-analysis. J Dent 2023; 134:104532. [PMID: 37120090 DOI: 10.1016/j.jdent.2023.104532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 03/20/2023] [Accepted: 04/25/2023] [Indexed: 05/01/2023] Open
Abstract
OBJECTIVES Thus far, the findings of numerous studies conducted on the accuracy of three-dimensional (3D) printed dental models are conflicting. Therefore, the aim of the network meta-analysis (NMA) is to determine the accuracy of 3D printed dental models compared with digital reference models. DATA Studies comparing the accuracy of 3D printed full-arch dental models manufactured using different printing techniques to initial STL files were included. SOURCES This study was registered in PROSPERO (CRD42021285863). An electronic search was performed across four databases in November 2021, and search was restricted to the English language. STUDY SELECTION A systematic search was conducted based on a prespecified search query. 16,303 articles were pooled after the removal of the duplicates. Following study selection and data extraction, 11 eligible studies were included in the NMA in 6 subgroups. The outcomes were specified as trueness and precision and expressed as root mean square (RMS) and absolute mean deviation values. Seven printing technologies were analyzed: stereolithography (SLA), digital light processing (DLP), fused deposition modeling/fused filament fabrication (FDM/FFF), MultiJet, PolyJet, continuous liquid interface production (CLIP), and LCD technology. The QUADAS-2 and GRADE were used to evaluate the risk of bias and certainty of evidence. CONCLUSIONS SLA, DLP, and PolyJet technologies were the most accurate in producing precise full-arch dental models. CLINICAL SIGNIFICANCE The findings of the NMA suggest that SLA, DLP, and PolyJet technologies are sufficiently accurate for full-arch dental model production for prosthodontic purposes. In contrast, FDM/FFF, CLIP, and LCD technologies are less suitable for manufacturing dental devices.
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Affiliation(s)
- Anna Németh
- Centre for Translational Medicine, Semmelweis University, Budapest, Hungary; Department of Prosthodontics, Semmelweis University, Budapest, Hungary
| | - Viktória Vitai
- Centre for Translational Medicine, Semmelweis University, Budapest, Hungary; Department of Prosthodontics, Semmelweis University, Budapest, Hungary
| | - Márk László Czumbel
- Centre for Translational Medicine, Semmelweis University, Budapest, Hungary; Department of Periodontology, Semmelweis University, Budapest, Hungary
| | - Bence Szabó
- Centre for Translational Medicine, Semmelweis University, Budapest, Hungary
| | - Gábor Varga
- Centre for Translational Medicine, Semmelweis University, Budapest, Hungary; Department of Oral Biology, Semmelweis University, Budapest, Hungary
| | - Beáta Kerémi
- Centre for Translational Medicine, Semmelweis University, Budapest, Hungary; Department of Restorative Dentistry and Endodontics, Semmelweis University, Budapest, Hungary
| | - Péter Hegyi
- Centre for Translational Medicine, Semmelweis University, Budapest, Hungary; Division of Pancreatic Diseases, Heart and Vascular Center, Semmelweis University, Budapest, Hungary; Institute for Translational Medicine, Medical School, University of Pécs, Pécs, Hungary
| | - Péter Hermann
- Centre for Translational Medicine, Semmelweis University, Budapest, Hungary; Department of Prosthodontics, Semmelweis University, Budapest, Hungary
| | - Judit Borbély
- Centre for Translational Medicine, Semmelweis University, Budapest, Hungary; Department of Prosthodontics, Semmelweis University, Budapest, Hungary.
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Aesthetic Concerns of Chin Augmentation With Hyaluronic Acid Soft Tissue Filler in Chinese: A Prospective, Observational Study. Dermatol Surg 2023; 49:242-246. [PMID: 36728221 DOI: 10.1097/dss.0000000000003691] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
BACKGROUND The chin is an important facial structure that directly affects the overall contour of the face. The key to achieving a beautiful, effective, and safe chin injection is to make a good facial assessment and use an appropriate injection technique to achieve the best injection effect. OBJECTIVE In this article, the authors will discuss cosmetic concepts for the chin area and verify the effectiveness of chin augmentation techniques. MATERIALS AND METHODS Chin volume injections were performed on 23 Asian female subjects and 15 Asian male subjects. Demographic and imaging data were collected, and the facial aesthetic length was calculated. The authors also measured the length of beautiful chins, as evaluated by 2 plastic surgeons, and the ratios of chins from "The 100 Most Beautiful/Handsome Faces in China" published by TCC Asia in 2020. RESULTS The mean volume of chin filling was 1.89 ± 0.74 mL in female subjects and 2.68 ± 1.28 mL in male subjects. The ideal length of the chin was equal to that of the nasal dorsum in male subjects, and the ideal chin-to-nasal dorsum ratio was 0.9 in female subjects. CONCLUSION In this study, the authors investigate sex differences in chin aesthetics among the Chinese population and introduce an aesthetic and anatomical approach to chin injection.
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Pan F, Liu J, Cen Y, Chen Y, Cai R, Zhao Z, Liao W, Wang J. Accuracy of RGB-D camera-based and stereophotogrammetric facial scanners: a comparative study. J Dent 2022; 127:104302. [PMID: 36152954 DOI: 10.1016/j.jdent.2022.104302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 09/05/2022] [Accepted: 09/20/2022] [Indexed: 12/14/2022] Open
Abstract
OBJECTIVES This study aimed to evaluate and compare the accuracy and inter-operator reliability of a low-cost red-green-blue-depth (RGB-D) camera-based facial scanner (Bellus3D Arc7) with a stereophotogrammetry facial scanner (3dMD) and to explore the possibility of the former as a clinical substitute for the latter. METHODS A mannequin head was selected as the research object. In the RGB-D camera-based facial scanner group, the head was continuously scanned five times using an RGB-D camera-based facial scanner (Bellus3D Arc7), and the outcome data of each scan was then imported into CAD software (MeshLab) to reconstruct three-dimensional (3D) facial photographs. In the stereophotogrammetry facial scanner group, the mannequin head was scanned with a stereophotogrammetry facial scanner (3dMD). Selected parameters were directly measured on the reconstructed 3D virtual faces using a CAD software. The same parameters were then measured directly on the mannequin head using the direct anthropometry (DA) method as the gold standard for later comparison. The accuracy of the facial scanners was evaluated in terms of trueness and precision. Trueness was evaluated by comparing the measurement results of the two groups with each other and with that of DA using equivalence tests and average absolute deviations, while precision and inter-operator reliability were assessed using the intraclass correlation coefficient (ICC). A 3D facial mesh deviation between the two groups was also calculated for further reference using a 3D metrology software (GOM inspect pro). RESULTS In terms of trueness, the average absolute deviations between RGB-D camera-based and stereophotogrammetry facial scanners, between RGB-D camera-based facial scanner and DA, and between stereophotogrammetry facial scanner and DA were statistically equivalent at 0.50±0.27 mm, 0.61±0.42 mm, and 0.28±0.14 mm, respectively. Equivalence test results confirmed that their equivalence was within clinical requirements (<1 mm). The ICC for each parameter was approximately 0.999 in terms of precision and inter-operator reliability. A 3D facial mesh analysis suggested that the deviation between the two groups was 0.37±0.01 mm. CONCLUSIONS For facial scanners, an accuracy of <1 mm is commonly considered clinically acceptable. Both the RGB-D camera-based and stereophotogrammetry facial scanners in this study showed acceptable trueness, high precision, and inter-operator reliability. A low-cost RGB-D camera-based facial scanner could be an eligible clinical substitute for traditional stereophotogrammetry. CLINICAL SIGNIFICANCE The low-cost RGB-D camera-based facial scanner showed clinically acceptable trueness, high precision, and inter-operator reliability; thus, it could be an eligible clinical substitute for traditional stereophotogrammetry.
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Affiliation(s)
- Fangwei Pan
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, Department of Prosthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - Jialing Liu
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - Yueyan Cen
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Ye Chen
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Ruilie Cai
- Department of Epidemiology and Biostatistics, Arnold School of Public Health, University of South Carolina, South Carolina, United States
| | - Zhihe Zhao
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - Wen Liao
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China.
| | - Jian Wang
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, Department of Prosthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China.
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21
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Li Y. Research and Implementation of Indoor 3D Positioning Algorithm Based on LED Visible Light Communication and Corresponding Parameter Estimation. COMPUTATIONAL INTELLIGENCE AND NEUROSCIENCE 2022; 2022:2940558. [PMID: 36148418 PMCID: PMC9489345 DOI: 10.1155/2022/2940558] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 06/23/2022] [Accepted: 07/01/2022] [Indexed: 11/17/2022]
Abstract
In the era of mobile Internet, the application of various positioning-based location service systems is becoming more and more common. In addition, the traditional radio positioning system is limited in the use of special environments such as mines, hospitals, and gas stations, and long-term electromagnetic radiation can cause potential damage to the human body. Compared with the traditional wireless positioning technology, VLC-based positioning technology has a good application prospect in the field of indoor wireless positioning. Compared with traditional radio positioning technology, the use of VLC technology to achieve indoor positioning is different in that the system design and layout need to consider the basic needs of indoor lighting; that is, the layout of multiple visible light sources in the room should meet the minimum illumination requirements of any area of the room. Since the layout structure of the light source that only considers the lighting requirements or only considers the positioning accuracy requirements is not the same, in the design process of the indoor visible light wireless positioning system, it is necessary to consider the overall optimization layout of multiple indoor visible light sources under the conditions of lighting and positioning constraints. This paper mainly optimizes indoor positioning from the aspects of light source layout, reflected light intensity distribution, and noise model.
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Affiliation(s)
- Yi Li
- School of Information Engineering, Xi'an University, Xi'an, Shaanxi, China
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22
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Tsuchida Y, Shiozawa M, Handa K, Takahashi H, Nikawa H. Comparison of the accuracy of different handheld-type scanners in three-dimensional facial image recognition. J Prosthodont Res 2022; 67:222-230. [PMID: 35768278 DOI: 10.2186/jpr.jpr_d_22_00001] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
PURPOSE Handheld-type scanners are widely used in clinical practice. This study examined the accuracy of handheld-type scanners using plaster statues to assess their performance in facial recognition. METHODS Twelve 4-mm zirconia balls as measuring points were attached to the facial portions of three types of plaster statue. Six digital facial images of each plaster statue were obtained using one of the following five handheld-type scanners: Artec Eva, Artec Spider, Bellus 3D FaceApp, SNAP, and Vectra H1. Four-millimeter spherical objects were manually placed at the measurement points on the scanned data generated using computer-aided design software and coordinate positions were measured using a contact-type high-resolution three-dimensional measurement device. Consequently, the discrepancy between the distance measured using the contact-type device and that measured using the handheld-type scanner was calculated. The scanning time, processing time, and deviation of the distance between the measuring points were analyzed using two-way analysis of variance and t-test with Bonferroni correction. RESULTS The scanning and processing times ranged from 15.2 to 42.2 s and 20.7 to 234.2 s, respectively. Overall, 97% of all measured distances by Spider were within ±1.00% deviation; 79%, Vectra; 73%, Eva; 70%, Bellus; and 42%, SNAP. CONCLUSIONS The performance of handheld-type scanners using plaster statues varied among the different scanners. The scanning time of Eva and the processing time of Bellus were significantly shorter than those of other scanners. Furthermore, Spider exhibited the best accuracy, followed by Eva, Vectra, Bellus, and SNAP.
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Affiliation(s)
- Yumi Tsuchida
- Department of Digital Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.,Department of Oral Biology & Engineering, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Maho Shiozawa
- Department of Oral Prosthetic Engineering, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Kazuyuki Handa
- Department of Advanced Prosthodontics, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Hidekazu Takahashi
- Course for Oral Health Engineering, Faculty of Dentistry, Tokyo Medical and Dental University, Tokyo, Japan
| | - Hiroki Nikawa
- Department of Oral Biology & Engineering, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
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Revilla-León M, Gohil A, Barmak AB, Zandinejad A, Raigrodski AJ. Best-Fit Algorithm Influences on Virtual Casts' Alignment Discrepancies. J Prosthodont 2022; 32:331-339. [PMID: 35524587 DOI: 10.1111/jopr.13537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Accepted: 04/23/2022] [Indexed: 11/27/2022] Open
Abstract
PURPOSE To measure the influence of best-fit (BF) algorithms (entire dataset, 3 or 6 points landmark-based, or section-based BF) on virtual casts and their alignment discrepancies. MATERIAL AND METHODS A mandibular typodont was obtained and digitized by using an industrial scanner (GOM Atos Q 3D 12M). A control mesh was acquired. The typodont was digitized by using an intraoral scanner (TRIOS 4). Based on the alignment procedures, four groups were created: BF of the entire dataset (BF group), landmark-based BF using 3 reference points (LBF-3 group), or 6 reference points (LBF-6 group), and section-based BF (SBF group). The root mean square (RMS) error was calculated. One-way ANOVA and post-hoc pairwise multi-comparison Tukey were used to analyze the data (α = .05). RESULTS Significant RMS error mean value differences were found across the groups (P<.001). Tukey test revealed significant RMS error mean value differences between the BF and LBF-3 groups (P = .022), BF and LBF-6 groups (P<.001), LB-3 and LB-6 groups (P<.001), LBF-3 and SBF groups (P<.001), and LBF-6 and SBF groups (P<.001). The LBF-6 group had the lowest trueness, while SBF and BF groups obtained the highest trueness values. Furthermore, significant SD differences were revealed across the groups tested (P<.001). Tukey test revealed significant SD differences between the BF and LBF-6 groups (P<.001), LBF-3 and LB-6 groups (P<.001), LBF-3 and SBF groups (P = .004), and LBF-6 and SBF groups (P<.001). The BF and SBF groups showed equal and highest precision, while the LBF-6 group had the lowest precision. CONCLUSIONS The best-fit algorithms tested influenced the virtual casts' alignment discrepancy. Entire dataset or section-based best-fit algorithms obtained the highest virtual casts' alignment trueness and precision compared with the landmark-based method.
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Affiliation(s)
- Marta Revilla-León
- Affiliate Assistant Professor, Graduate Prosthodontics, Department of Restorative Dentistry, School of Dentistry, University of Washington, Seattle, Wash; Director of Research and Digital Dentistry, Kois Center, Seattle, Wash; and Adjunct Professor, Department of Prosthodontics, Tufts University, Boston, MA, USA
| | - Aishwa Gohil
- Undergraduate student, College of Dentistry, Texas A&M University, Dallas, TX, USA
| | - Abdul B Barmak
- Assistant Professor Clinical Research and Biostatistics, Eastman Institute of Oral Health, University of Rochester Medical Center, Rochester, NY, USA
| | - Amirali Zandinejad
- Associate Professor and Program Director AEGD Residency, Comprehensive Dentistry Department, College of Dentistry, Texas A&M University, Dallas, TX, USA
| | - Ariel J Raigrodski
- Private Practice, Lynnwood, Wash and Affiliate Professor, Department of Restorative Dentistry, School of Dentistry, University of Washington, Seattle, USA
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Rouzé l'Alzit F, Cade R, Naveau A, Babilotte J, Meglioli M, Catros S. Accuracy of commercial 3D printers for the fabrication of surgical guides in dental implantology. J Dent 2021; 117:103909. [PMID: 34852291 DOI: 10.1016/j.jdent.2021.103909] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2021] [Revised: 11/20/2021] [Accepted: 11/25/2021] [Indexed: 11/28/2022] Open
Abstract
OBJECTIVES To evaluate the accuracy of two different surgical guides (small extent = single implant and large extent = full arch) fabricated by five additive manufacturing technologies (SLA=Stereolithography, DLP= Digital Light Processing, FDM=Fused Deposition Modeling, SLS=Selective Laser Sintering, Inkjet). METHODS Overall, 72 guides (6 per type) were obtained with the different machines (SLA=Form2; DLP=Rapid Shape D40 and Cara Print 4.0; FDM=Raise 3D Pro2; SLS=Prodways P1000; Polyjet®=Stratasys J750). The guides were surface-scanned with an optical dental scanner, and the resulting files were compared with the initial design files using a surface matching software. Root Mean Square (RMS) and standard deviation were calculated, representing respectively trueness and precision. Kruskall-Wallis non-parametric test was used to compare trueness and precision between small-extent and large-extent guides and 3D printer by pairs. The threshold for significance was α=0.05, except for the comparison of printers by pairs where a Bonferroni-corrected level of 0.0033 was used. RESULTS Significant differences were observed for trueness and precision between small-extent and large-extent guides, regardless the printer except for DLP (trueness and precision) and SLS (precision). SLA, DLP and Polyjet® technologies showed similar results in terms of trueness and precision for both small-extend and large-extend guides (P>0.05). CONCLUSIONS The size affected the accuracy of CAD-CAM surgical guides. The different additive manufacturing technologies had a limited impact on the accuracy. CLINICAL SIGNIFICANCE This study is of clinical interest as it shows that the 3D printing technology (SLA/DLP) has a limited impact on 3D printed surgical guides accuracy. However, the size of the guide can have a significant impact, as small-extent guides were more accurate than large-extent guides.
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Affiliation(s)
- Francois Rouzé l'Alzit
- Institute of Condensed Matter Chemistry of Bordeaux, CNRS UMR5026, University of Bordeaux, Bordeaux, France; Department of prosthodontic dentistry, CHU Bordeaux, Bordeaux, France.
| | | | - Adrien Naveau
- Department of prosthodontic dentistry, CHU Bordeaux, Bordeaux, France; Tissue Bioengineering, INSERM U1026, University of Bordeaux, Bordeaux, France
| | - Joanna Babilotte
- Tissue Bioengineering, INSERM U1026, University of Bordeaux, Bordeaux, France
| | - Matteo Meglioli
- Center of Dental Medicine, Department of Medicine and Surgery, University of Parma, Parma, Italy
| | - Sylvain Catros
- Tissue Bioengineering, INSERM U1026, University of Bordeaux, Bordeaux, France; Department of Oral Surgery, CHU Bordeaux, Bordeaux, France
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25
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Raffone C, Gianfreda F, Bollero P, Pompeo MG, Miele G, Canullo L. Chairside virtual patient protocol. Part 1: Free vs Guided face scan protocol. J Dent 2021; 116:103881. [PMID: 34762986 DOI: 10.1016/j.jdent.2021.103881] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 10/29/2021] [Accepted: 11/01/2021] [Indexed: 11/16/2022] Open
Abstract
OBJECTIVES The 3D facial scan technology allows to virtualize the face of the patient, that can be incorporated with other 3D dental images produced by digital scanning of the dental structures. Aim of this study is to investigate the trueness and precision of a low-cost portable face scanner, with two different scan techniques MATERIALS AND METHODS: Ten patients were enrolled for this study and seventeen soft tissue landmarks were selected to perform linear facial measurements, specifically Reference (Ref), Pronasion (Prn), Subnasal (Sn), Exocanthion Left (Ex-L), Exocanthion Right (Ex-R), Pogonion (Pg), Glabella (G), Alar curvature Right (Al-R), Alar curvature Left (Al-L), Zygion Left (Zn-L), Zygion Right (Zn-R), Orbital Left (Or-L), Orbital Right (Or-R), Tragus Right (T-R), Tragus Left (T-L), Chelion Right (Ch-R) and Chelion Left (Ch-L). Interlandmark distances were measured both manually and digitally. For the manual group ten measurements were made using a digital caliper. For digital group measurements were recorded on the patient face scan obtained using an Ipad Pro 3rd Gen. (Apple Store, Cupertino, CA, USA) and Bellus3D Dental Pro-App (Bellus3D, Inc. Campbell, CA, USA) using "face mode" scan with two different scanning techniques, named Free technique (FT) and Slider Technique (ST). Ten measurements were made for each technique. An open-source software (Meshlab; Meshlab) was used to record all the distances. A paired t-test was used to analyze FT and ST results. In order to further evaluate precision and scan repeatability a surface analysis was performed with both scanning techniques using a CAD software (GOM inspect, GOM) and the total differences in absolute 3D deviations were calculated as root mean square. RESULTS The comparison between manual and digital measurements showed a mean absolute difference of 0.95±0.25 for FT and 1.00±0.29 for the ST. Trueness analysis showed statistically significant differences for the Exocanthion L- Exocanthion R measurement with FT having better performance (P<.05). Precision analysis showed statistically significant differences for G-Pg, Ref-Zn-R and Prn-Zn-R with ST having better performance (P<.05). To achieve all the scans required without any signs of deformation, 184 scans were performed using Free technique and 124 scans using Slider technique. Surface analysis revealed a mean distance of 0.12±0.45 between Free scans and 0.13±0.46 between Slider scans in accordance with the linear measurement analysis CONCLUSION: The study showed that accuracy of low-cost portable scanner can be suitable for clinical use. The use of ST is suggested for a reliable clinical use due to the better precision and an effective reduction of motion artifacts and the lower compliance required to the patients during the scan.
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Affiliation(s)
| | - Francesco Gianfreda
- Department of Industrial Engineering, University of Rome "Tor Vergata", 00133 Rome, Italy.
| | - Patrizio Bollero
- Department of System Medicine, University of Rome "Tor Vergata", 00133 Rome, Italy.
| | | | - Gianfranco Miele
- Department of Electrical and Information Engineering (DIEI), University of Cassino and Southern Lazio,Via Di Biasio 43 03043 Cassino, FR, Italy.
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Revilla-León M, Quesada-Olmo N, Gómez-Polo M, Sicilia E, Farjas-Abadia M, Kois JC. Influence of rescanning mesh holes on the accuracy of an intraoral scanner: An in vivo study. J Dent 2021; 115:103851. [PMID: 34656658 DOI: 10.1016/j.jdent.2021.103851] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 09/27/2021] [Accepted: 10/06/2021] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVES To evaluate whether the cutting-off and rescanning procedures have an impact on the accuracy (trueness and precision) of the intraoral digital scan. METHODS A right quadrant digital scan (reference scan) of a participant was obtained using an intraoral scanner (IOS) (TRIOS 4; 3Shape A/S, Copenhagen, Denmark). The reference scan was duplicated 135 times and divided into 3 groups based on the number of rescanned mesh areas: 1 (G1 group), 2 (G2 group), and 3 (G3 group) mesh holes. Each group was subdivided into 3 subgroups depending on the mesh hole diameter: 2 mm- (G1-2, G2-2, and G3-2), 4 mm- (G1-4, G2-4, and G3-4), and 6 mm- (G1-6, G2-6, and G3-6) (n = 15). A software program (Geomagic; 3D Systems, Rock Hill, SC, USA) was used to assess the discrepancy between the reference and the experimental scans using the root mean square (RMS). Kruskal-Wallis and post hoc multiple comparison Dunn's tests were used to analyze the data (α=0.05). RESULTS Trueness ranged from 5 to 20 µm and precision ranged from 2 to 10 µm. For trueness assessment, Kruskal-Wallis test revealed significant differences on the RMS error values among the groups tested (P<.05). The G3-6 group obtained the lowest trueness and lowest precision values, while the G1-2, G1-4, G2-2, G2-4, and G3-2 groups computed the highest trueness and precision values. When comparing groups with the same number of rescanned mesh holes but with different diameter, the higher the diameter of the rescanned mesh hole, the lower the trueness values computed; however, when comparing groups with the same diameter of the rescanned mesh hole but with differing number of rescanned mesh holes, no significant differences were found in the RMS values among the groups. For the precision evaluation, Levene's test showed a lack of equality of the variances, and therefore of the standard deviations. The F-test with Bonferroni correction identified significant differences between the SDs between group G3-6 and all the other groups. When comparing instead the interquartile range (IQRs) due to the non-normality of the data, groups G1 and G2 also showed lower IQR values or higher precision than groups G3. CONCLUSIONS Cutting-off and rescanning procedures decreased the accuracy of the IOS tested. The higher the number and diameter of the rescanned areas, the lower the accuracy. CLINICAL SIGNIFICANCE Cutting-off and rescanning procedures should be minimized in order to increase the accuracy of the IOS evaluated. The intended clinical use of the intraoral digital scan is a critical factor that might determine the scanning workflow procedures.
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Affiliation(s)
- Marta Revilla-León
- Assistant Professor and Assistant Program Director AEGD Residency, Comprehensive Dentistry Department, College of Dentistry, Texas A&M University, Dallas, TX, USA; Affiliate Faculty, Graduate Prosthodontics, Department of Restorative Dentistry, University of Washington, Seattle, WA, USA; and Researcher at Revilla Research Center, Madrid, Spain
| | - Nieves Quesada-Olmo
- Assistant Professor Department of Geodesy, Mapping and Surveying Engineering, Universidad Politécnica of Valencia, Valencia, Spain
| | - Miguel Gómez-Polo
- Associate Professor Department of Conservative Dentistry and Prosthodontics, School of Dentistry, Complutense University of Madrid, Spain
| | - Elena Sicilia
- Resident Graduate in Prosthodontics, Department of Prosthodontics, Tufts University School of Dental Medicine, Boston, MA, USA
| | - Mercedes Farjas-Abadia
- Professor Department of Topographical Engineering and Cartography, Universidad Politécnica of Madrid, Madrid, Spain
| | - John C Kois
- Founder and Director Kois Center, Seattle, WA; Affiliate Professor, Graduate Prosthodontics, Department of Restorative Dentistry, University of Washington, Seattle, WA, USA; and Private Practice, Seattle, WA, USA
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