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Rathee M, Divakar S, Singla S, Tomar SS. Fabrication of three-dimensionally printed polylactic acid nasal stent prosthesis for postnasal reconstruction using extraoral scanning and photogrammetry techniques: A report on two patients. J Prosthet Dent 2024; 132:840.e1-840.e6. [PMID: 38688755 DOI: 10.1016/j.prosdent.2024.03.042] [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: 09/27/2023] [Revised: 03/21/2024] [Accepted: 03/22/2024] [Indexed: 05/02/2024]
Abstract
Severe and combined nasal defects associated with trauma or neoplasm excision can cause significant functional and esthetic problems. To avoid nasal synechia following reconstructive surgeries, a nasal stent prosthesis is required to act as an internal scaffold to support the graft and residual tissues. The purpose of the stent is to maintain internal airway patency and to prevent collapse and contracture of the donor tissues. A conventional nasal stent prosthesis has disadvantages, including the difficulty in maintaining adequate thickness and internal patency during fabrication. Hence, this clinical report introduces the fabrication technique for 3-dimensionally printed polylactic acid nasal stent prostheses using extraoral scanning and photogrammetry methods.
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Affiliation(s)
- Manu Rathee
- Senior Professor and Head, Department of Prosthodontics, Post Graduate Institute of Dental Sciences, Rohtak, Haryana, India
| | - S Divakar
- Former Postgraduate student, Department of Prosthodontics, Post Graduate Institute of Dental Sciences, Rohtak, Haryana, India.
| | - Shefali Singla
- Professor and Head, Department of Prosthodontics, Dr. HSJ Institute of Dental Sciences, Punjab University, Chandigarh
| | - Sarthak Singh Tomar
- Postgraduate student, Department of Prosthodontics, Post Graduate Institute of Dental Sciences, Rohtak, Haryana, India
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Pandey R, Kamble R, Kanani H. Revolutionizing Smiles: Advancing Orthodontics Through Digital Innovation. Cureus 2024; 16:e64086. [PMID: 39114257 PMCID: PMC11305434 DOI: 10.7759/cureus.64086] [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: 06/06/2024] [Accepted: 07/08/2024] [Indexed: 08/10/2024] Open
Abstract
Orthodontics is undergoing a digital revolution, transforming traditional techniques with modern technology. This evolution is driven by the need for precise diagnosis and treatment planning. Digital platforms, including digital radiography and cone beam computed tomography (CBCT), are replacing conventional methods, enhancing documentation, analysis, and appliance production. Three-dimensional imaging enables customized treatment plans and appliance design using computer-aided design and computer-aided manufacture (CAD/CAM). Integration of digital models and software facilitates treatment simulation and patient communication. Digital videography enhances diagnostic capabilities. Embracing digital processes is essential for improved patient care and practice efficiency in orthodontics. This review article on digital orthodontics aims to provide a comprehensive overview and critical analysis of the current advancements, technologies, applications, benefits, and challenges in the field of orthodontics utilizing digital tools and technologies.
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Affiliation(s)
- Ruchika Pandey
- Orthodontics and Dentofacial Orthopedics, Sharad Pawar Dental College and Hospital, Datta Meghe Institute of Higher Education & Research, Wardha, IND
| | - Ranjit Kamble
- Orthodontics and Dentofacial Orthopedics, Sharad Pawar Dental College and Hospital, Datta Meghe Institute of Higher Education & Research, Wardha, IND
| | - Harikishan Kanani
- Pediatric Dentistry, Sharad Pawar Dental College and Hospital, Datta Meghe Institute of Higher Education & Research, Wardha, IND
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Jiang Y, Long H, Soo SY, Mavani H, Tew IM. Accuracy of Complete-Arch Scans Obtained by Intraoral Scanner and Smartphone Three-Dimensional Scanning Applications With Different Smartphone Position Setups: An In Vitro Study. Cureus 2024; 16:e63471. [PMID: 39077296 PMCID: PMC11286105 DOI: 10.7759/cureus.63471] [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] [Accepted: 06/29/2024] [Indexed: 07/31/2024] Open
Abstract
INTRODUCTION The high cost of intraoral scanners (IOS) for complete-arch scans makes them less accessible for many dental practitioners. As a viable alternative, smartphone scanner applications (SMP) provide comparable scanning capabilities at a significantly low cost. However, there is limited data on the accuracy of SMP, especially when used in various smartphone positions. This study aimed to compare the three-dimensional (3D) and linear accuracy of complete-arch scans acquired by an IOS and SMP (KIRI Engine, KIRI Innovations, Guangdong, China) at three shooting angles (0°, 45°, and 90° for SMP_3A) and two shooting angles (30° and 60° for SMP_2A). METHODS A stone dental cast was scanned with a laboratory scanner as a reference, with 11 scans performed by an IOS, SMP_2A, and SMP_3A. In 3D analysis, trueness and precision were evaluated through superimposition with the reference scan and within each group, respectively, using the best-fit algorithm of Geomagic Wrap software (3D Systems, Inc., Rock Hill, SC). Trueness in linear discrepancy was assessed by comparing the occlusal-cervical and mesiodistal dimensions of reference teeth (canine, premolar, and molar), intercanine width, and intermolar width on the digital casts to measurements of the stone cast, while precision was measured using the coefficient of variance. Differences between groups were analyzed using the Friedman test, followed by the Dunn-Bonferroni post hoc test with a significance level set at 0.05. RESULTS IOS exhibited significantly lower trueness than SMP_2A (p = 0.003) with significantly greater width discrepancies on canines (p = 0.001) and molars (p < 0.001). Discrepancy patterns differed among the three scanning methods. The IOS showed greater discrepancies on the occlusal surfaces of posterior teeth. While SMP_3A demonstrated higher variation on the palatal surfaces and interproximal areas of posterior teeth. For precision, SMP_3A (p = 0.028) and SMP_2A (p = 0.003) showed a significantly lower precision in 3D analysis, but a comparable reproducibility in linear measurement to IOS. CONCLUSION TRIOS IOS (3Shape, Copenhagen, Denmark) exhibited lower trueness in 3D and linear accuracy analyses for complete-arch scans. The positions of the smartphone significantly enhanced trueness at the undercut region. SMP_2A and SMP_3A can be a potential alternative for precise linear measurement in complete-arch scans with selective use.
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Affiliation(s)
- Yuhao Jiang
- Department of Restorative Dentistry, The National University of Malaysia, Kuala Lumpur, MYS
| | - Hu Long
- Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, CHN
| | - Suet Yeo Soo
- Department of Restorative Dentistry, The National University of Malaysia, Kuala Lumpur, MYS
| | - Hetal Mavani
- Department of Restorative Dentistry, The National University of Malaysia, Kuala Lumpur, MYS
| | - In Meei Tew
- Department of Restorative Dentistry, The National University of Malaysia, Kuala Lumpur, MYS
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Rosmaninho A, Vedovato E, Kois JC, Revilla-León M. Altered reverse impression method involving extraoral digitalization of a verification jig for the fabrication of implant-supported prosthesis by using a complete-digital workflow. J ESTHET RESTOR DENT 2024; 36:566-572. [PMID: 37882153 DOI: 10.1111/jerd.13157] [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: 08/23/2023] [Accepted: 10/10/2023] [Indexed: 10/27/2023]
Abstract
The reverse impression method involves the extraoral digitalization of the interim implant-supported prostheses and intraoral digitalization of antagonist arch and maxillomandibular relationship. This technique allows the fabrication of implant-supported prostheses by using a complete-digital workflow. The scan analogs make the reverse impression method feasible. However, this method may not be recommended if the interim polymethyl methacrylate prosthesis does not have passive fit. The present manuscript describes an altered reverse impression technique that involves the extraoral digitalization of a conventional verification jig, which has attached scan analogs. With this technique modification, the implant positions captured using the verification jig are used to obtain the virtual definitive implant cast and fabricate the definitive implant-supported prosthesis.
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Affiliation(s)
| | | | - John C Kois
- Founder and Director Kois Center, Seattle, Washington, USA
- Department of Restorative Dentistry, School of Dentistry, University of Washington, Seattle, Washington, USA
- Private Practice, Seattle, Washington, USA
| | - Marta Revilla-León
- Department of Restorative Dentistry, School of Dentistry, University of Washington, Seattle, Washington, USA
- Faculty & Director of Research and Digital Dentistry, Kois Center, Seattle, Washington, USA
- Department of Prosthodontics, School of Dental Medicine, Tufts University, Boston, Massachusetts, USA
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Rathee M, Chahal S, Jain P, Alam M, Divakar S, Singh S. Rehabilitation Using Hybrid Technique for Feeding Plate Fabrication in a 3-Month-Old Infant with Cleft Palate Defect Utilising Digital and Conventional Method: A Case Report. Afr J Paediatr Surg 2024; 21:144-147. [PMID: 38546255 PMCID: PMC11003572 DOI: 10.4103/ajps.ajps_143_22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Accepted: 01/09/2023] [Indexed: 04/04/2024] Open
Abstract
ABSTRACT Cleft palate leads to difficulty in suckling, speech abnormalities, dental problems, hearing loss and middle ear infections. Feeding plate acts as a barrier between the oral and nasal cavities allowing the normal development of jaws and enhanced nutritional supply to the patient. Fabrication of the feeding plate using digital means provide better adaptability due to the engagement of all the possible favourable anatomic undercuts, thereby, providing better retention. This case report discusses the hybrid technique including both the digital and conventional means for fabrication of a feeding plate to obturate the defect between the oral and nasal cavity.
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Affiliation(s)
- Manu Rathee
- Department of Prosthodontics, Post Graduate Institute of Dental Sciences, Pt. B.D. Sharma University of Health Sciences, Rohtak, Haryana, India
| | - Sujata Chahal
- Department of Prosthodontics, Post Graduate Institute of Dental Sciences, Pt. B.D. Sharma University of Health Sciences, Rohtak, Haryana, India
| | - Prachi Jain
- Department of Prosthodontics, Post Graduate Institute of Dental Sciences, Pt. B.D. Sharma University of Health Sciences, Rohtak, Haryana, India
| | - Maqbul Alam
- Department of Prosthodontics, Post Graduate Institute of Dental Sciences, Pt. B.D. Sharma University of Health Sciences, Rohtak, Haryana, India
| | - S Divakar
- Department of Prosthodontics, Post Graduate Institute of Dental Sciences, Pt. B.D. Sharma University of Health Sciences, Rohtak, Haryana, India
| | - Sandeep Singh
- Department of Prosthodontics, Post Graduate Institute of Dental Sciences, Pt. B.D. Sharma University of Health Sciences, Rohtak, Haryana, India
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Conceição P, Portugal J, Franco M, Alves NM, Marques D, Neves CB. Comparison between digital superimposition and microcomputed tomography methods of fit assessment of removable partial denture frameworks. J Prosthet Dent 2024; 131:479-486. [PMID: 36890000 DOI: 10.1016/j.prosdent.2023.02.002] [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: 09/24/2022] [Revised: 02/02/2023] [Accepted: 02/03/2023] [Indexed: 03/08/2023]
Abstract
STATEMENT OF PROBLEM The fit of removable partial denture frameworks should be assessed to optimize clinical adaptation. Potential discrepancies between framework and supporting structures are typically precisely measured with negative subtracts and high-resolution equipment. The growth of computer-aided engineering technology allows the development of new methods for the direct evaluation of discrepancies. However, how the methods compare is unclear. PURPOSE The purpose of this in vitro study was to compare 2 digital methods of fit assessment based on direct digital superimposition and microcomputed tomography indirect analysis. MATERIAL AND METHODS Twelve cobalt chromium removable partial denture frameworks were fabricated by conventional lost-wax casting or additive manufacturing techniques. The thickness of the gap between occlusal rests and respective definitive cast rest seats (n=34) was evaluated by using 2 different digital methods. Silicone elastomer impressions of the gaps were obtained, and microcomputed tomography measurements were used as controls for validation purposes. Digitization of the framework, the respective definitive cast, and the combination was followed by digital superimposition and direct measurements with the Geomagic Control X software program. Because normality and homogeneity of variance were not verified (Shapiro-Wilk and Levene tests, P<.05), the data were analyzed with Wilcoxon signed rank and Spearman correlation tests (α=.05). RESULTS The thicknesses measured by microcomputed tomography (median=242 μm) and digital superimposition (median=236 μm) did not reveal statistically significant differences (P=.180). A positive correlation (ρ=0.612) was detected between the 2 methods of assessing fit. CONCLUSIONS The frameworks presented median gap thicknesses under the limit of clinical acceptability without differences between the proposed methods. The digital superimposition method was determined to be as acceptable as the high-resolution microcomputed tomography method for assessing removable partial denture framework fit.
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Affiliation(s)
- Pedro Conceição
- Invited Assistant Professor, Department of Dental Biomaterials, Biomedical and Oral Sciences Research Unit (UICOB), Faculdade de Medicina Dentária, Universidade de Lisboa, Lisbon, Portugal
| | - Jaime Portugal
- Full Professor and Head, Department of Dental Biomaterials, Biomedical and Oral Sciences Research Unit (UICOB), Faculdade de Medicina Dentária, Universidade de Lisboa, Lisbon, Portugal
| | - Margarida Franco
- Laboratory Responsible, Material Characterization Laboratory, Centre for Rapid and Sustainable Product Development (CDRSP), Polytechnic Institute of Leiria (IPL), Marinha Grande, Portugal
| | - Nuno M Alves
- Coordinator Professor and Director, Department of Biomechanics, Centre for Rapid and Sustainable Product Development (CDRSP), Polytechnic Institute of Leiria (IPL), Marinha Grande, Portugal
| | - Duarte Marques
- Associate Professor with Habilitation, Department of Oral Rehabilitation, Biomedical and Oral Sciences Research Unit (UICOB), Faculdade de Medicina Dentária, Universidade de Lisboa, Lisbon, Portugal
| | - Cristina B Neves
- Assistant Professor with Habilitation, Department of Oral Rehabilitation, Biomedical and Oral Sciences Research Unit (UICOB), Faculdade de Medicina Dentária, Universidade de Lisboa, Lisbon, Portugal.
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Ahmed S, Hawsah A, Rustom R, Alamri A, Althomairy S, Alenezi M, Shaker S, Alrawsaa F, Althumairy A, Alteraigi A. Digital Impressions Versus Conventional Impressions in Prosthodontics: A Systematic Review. Cureus 2024; 16:e51537. [PMID: 38304652 PMCID: PMC10834103 DOI: 10.7759/cureus.51537] [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] [Accepted: 01/02/2024] [Indexed: 02/03/2024] Open
Abstract
The accuracy of definitive impressions has a significant impact on the quality of the final prosthesis. Elastic impression materials are commonly used in the traditional approach to replicate anatomical structures while indirectly fabricating prostheses. Digital impression has gained increasing popularity due to its various advantages, including three-dimensional previsualization, cost-effectiveness, and reduced time consumption. The objective of this study is to evaluate existing studies to provide an overview of the comparative advantages of digital impression techniques over conventional techniques. The review will focus on evaluating the accuracy, patient acceptability, operator preference, and time effectiveness of digital impression techniques in comparison to conventional techniques. The Population, Intervention, Comparison, and Outcome framework served as the basis for this study's search strategy. We conducted a comprehensive literature review by electronically searching articles published between 2000 and 2023 in PubMed, Medline, Cochrane, and the Web of Science. Furthermore, additional manual searches were conducted. The study examined the differences between optical impressions and traditional impressions in terms of accuracy, patient outcomes, and operator outcomes. It included both clinical and preclinical studies as well as randomized controlled trials. In conclusion, this review provides a short summary indicating that digital impressions exhibit comparable accuracy to conventional impressions without any statistically significant difference. This conclusion is based on an evaluation of accuracy, patient preference, and operator preference.
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Affiliation(s)
- Suhael Ahmed
- Maxillofacial Surgery, College of Medicine and Dentistry, Riyadh Elm University, Riyadh, SAU
| | - Abeer Hawsah
- Dentistry, Ministry of Health Saudi Arabia, Riyadh, SAU
| | | | - Abeer Alamri
- Dentistry, Ministry of Health Saudi Arabia, Riyadh, SAU
| | | | - Maha Alenezi
- Dentistry, Ministry of Health Saudi Arabia, Riyadh, SAU
| | - Sarah Shaker
- Dentistry, Ain Shams General Hospital, Cairo, EGY
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Desclos-Theveniau M, Abgrall H, Bar V, Basle F, Basle D, Dautel MJ, Rubin J, Delanoue F, Lefrançois E, Dautel A, Sérandour AL, Le Guicher G, Colombel H. Gingival displacement before impression making: A prospective, comparative randomized clinical trial. J Prosthet Dent 2023:S0022-3913(23)00644-3. [PMID: 37919130 DOI: 10.1016/j.prosdent.2023.09.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 09/21/2023] [Accepted: 09/21/2023] [Indexed: 11/04/2023]
Abstract
STATEMENT OF PROBLEM Gingival displacement is used in prosthodontics to obtain an accurate impression. However, randomized clinical trials to analyze the performance of different gingival displacement products are lacking. PURPOSE The purpose of this prospective, comparative randomized clinical trial was to evaluate the clinical effectiveness of 3 gingival displacement techniques: Racegel cordless, Racegel with a cord, and Racestyptine with a cord. MATERIAL AND METHODS A prospective, multicenter randomized, open label, 3-arm parallel group study was carried out in private dental practices. Patients with prepared teeth with healthy gingiva were recruited to make impressions before and after gingival displacement, which were digitized. Lateral and vertical gingival displacements were measured with computer-aided 3-dimensional analysis performed by a single operator who was blinded to the technique and the patient. For mean lateral gingival displacement, each gingival displacement method was compared with a required clinical value of 200 µm with the Student t test. The comparison of means among the 3 groups was performed using an ANOVA. Periodontal indices were recorded immediately and 7 to 14 days after gingival displacement. The percentages were compared with the chi-squared test or the Fisher exact test (α=.05 for all tests). RESULTS Eighty-eight participants were enrolled. The mean lateral gingival displacement obtained by Racestyptine with a cord (253 ±59 µm, P<.001) and by Racegel with a cord (247 ±61 µm, P<.001) were significantly higher than 200 µm. Lateral displacement observed with Racegel cordless was 207 ±57 µm (P=.53). For vertical gingival displacement, no difference among the 3 techniques was found. The astringent effect of these products was confirmed by the absence of crevicular fluid or bleeding. No periodontal damage was observed immediately or 7-14 days after displacement. CONCLUSIONS The study showed that cord impregnated with Racestyptine and Racegel with or without a cord provided a sufficient sulcus opening before impression making in prosthodontics, consistent with the clinical requirements for lateral displacement.
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Affiliation(s)
- Marie Desclos-Theveniau
- Associate Professor, Department of Prosthodontics, Nutrition Metabolisms and Cancer, U1317 INSERM, INRAE, UNIVREN, Rennes University Hospital Center (CHU Rennes), CIC 1414, Rennes, France.
| | | | | | | | | | | | | | | | - Etienne Lefrançois
- Assistant Professor, Department of Prosthodontics, Rennes University Hospital Center (CHU Rennes), Rennes, France
| | - Anne Dautel
- Associate Professor, Department of Restorative Dentistry, Rennes University Hospital Center (CHU Rennes), Rennes, France
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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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Abad-Coronel C, Pazán DP, Hidalgo L, Larriva Loyola J. Comparative Analysis between 3D-Printed Models Designed with Generic and Dental-Specific Software. Dent J (Basel) 2023; 11:216. [PMID: 37754336 PMCID: PMC10529710 DOI: 10.3390/dj11090216] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 08/28/2023] [Accepted: 09/11/2023] [Indexed: 09/28/2023] Open
Abstract
With the great demand in the market for new dental software, the need has been seen to carry out a precision study for applications in digital dentistry, for which there is no comparative study, and there is a general ignorance regarding their applications. The purpose of this study was to investigate the accuracy differences between digital impressions obtained using generic G-CAD (general CAD) and D-CAD (CAD dental) software. Today, there is a difference between the design software used in dentistry and these in common use. Thus, it is necessary to make a comparison of precision software for specific and generic dental use. We hypothesized that there is no significant difference between the software for specific and general dental use. METHODS A typodont was digitized with an intraoral scanner and the models obtained were exported in STL format to four different softwares (Autodesk MeshMixer 3.5, Exocad Dental, Blender for dental, and InLAB). The STL files obtained by each software were materialized using a 3D printer. The printed models were scanned and exported in STL files, with which six pairs of groups were formed. The groups were compared using analysis software (3D Geomagic Control X) by superimposing them in the initial alignment order and using the best fit method. RESULTS There were no significant differences between the four analyzed software types; however, group 4, composed of the combination of D-CAD (Blender-InLAB), obtained the highest average (-0.0324 SD = 0.0456), with a higher accuracy compared to the group with the lowest average (group 5, composed of the combination of the Meshmixer and Blender models), a generic software and a specific software (0.1024 SD = 0.0819). CONCLUSION Although no evidence of significant difference was found regarding the accuracy of 3D models produced by G-CAD and D-CAD, combinations of groups where specific dental design software was present showed higher accuracy (precision and trueness). The comparison of the 3D graphics obtained with the superimposition of the digital meshes of the printed models performed with the help of the analysis software using the best fit method, replicating the same five reference points for the six groups formed, evidenced a greater tolerance in the groups using D-CAD.
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Affiliation(s)
- Cristian Abad-Coronel
- CAD/CAM Materials and Digital Dentistry Research Group, Faculty of Dentistry, Universidad de Cuenca, Cuenca 010107, Ecuador
| | - Doménica Patricia Pazán
- Faculty of Dentistry, Universidad de Cuenca, Cuenca 010101, Ecuador; (D.P.P.); (L.H.); (J.L.L.)
| | - Lorena Hidalgo
- Faculty of Dentistry, Universidad de Cuenca, Cuenca 010101, Ecuador; (D.P.P.); (L.H.); (J.L.L.)
| | - Jaime Larriva Loyola
- Faculty of Dentistry, Universidad de Cuenca, Cuenca 010101, Ecuador; (D.P.P.); (L.H.); (J.L.L.)
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Jánosi KM, Cerghizan D, Mártha KI, Elekes É, Szakács B, Elekes Z, Kovács A, Szász A, Mureșan I, Hănțoiu LG. Evaluation of Intraoral Full-Arch Scan versus Conventional Preliminary Impression. J Clin Med 2023; 12:5508. [PMID: 37685574 PMCID: PMC10487891 DOI: 10.3390/jcm12175508] [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: 07/24/2023] [Revised: 08/19/2023] [Accepted: 08/23/2023] [Indexed: 09/10/2023] Open
Abstract
An accurate impression is vital during prosthodontic rehabilitation. Digital scanning has become an alternative to conventional impressions. This study compares conventional preliminary impression techniques with digital scanning, evaluating the efficiency, treatment comfort, and trueness. Impressions of 28 patients were taken using conventional and digital techniques. The efficiency of both impression techniques was evaluated by measuring the mean working time. A visual analog scale questionnaire (1-10) was used to appreciate the participants' perceptions of discomfort. Morphometric measurements, which were carried out to determine the differences between the casts, were made on the buccolingual cross sections of teeth 11 and 31 and the distolingual and mesiobuccal cusp tips of each first molar. The total treatment time was 75.5 min for conventional and 12 min for digital impressions. The patients scored a mean discomfort assessment of 6.66 for conventional and 9.03 for digital scanning. No significant differences existed between the examined areas (p < 0.05, Wilcoxon and Mann-Whitney tests) of the digital casts obtained by both techniques. The intraoral scan can be considered as an alternative to conventional preliminary impressions for performing study model analysis during orthodontic treatment planning. The digital impression is more comfortable and accepted by the patients than the conventional impression and has a shorter working time.
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Affiliation(s)
- Kinga Mária Jánosi
- Faculty of Dental Medicine, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Târgu Mureș, 38 Gh. Marinescu Str., 540139 Târgu Mureș, Romania
| | - Diana Cerghizan
- Faculty of Dental Medicine, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Târgu Mureș, 38 Gh. Marinescu Str., 540139 Târgu Mureș, Romania
| | - Krisztina Ildikó Mártha
- Faculty of Dental Medicine, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Târgu Mureș, 38 Gh. Marinescu Str., 540139 Târgu Mureș, Romania
| | - Éva Elekes
- Faculty of Dental Medicine, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Târgu Mureș, 38 Gh. Marinescu Str., 540139 Târgu Mureș, Romania
| | - Brigitta Szakács
- Faculty of Dental Medicine, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Târgu Mureș, 38 Gh. Marinescu Str., 540139 Târgu Mureș, Romania
| | | | - Alpár Kovács
- Independent Researcher, 540501 Târgu Mureș, Romania
| | - Andrea Szász
- Independent Researcher, 540501 Târgu Mureș, Romania
| | - Izabella Mureșan
- Faculty of Dental Medicine, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Târgu Mureș, 38 Gh. Marinescu Str., 540139 Târgu Mureș, Romania
| | - Liana Georgiana Hănțoiu
- Faculty of Dental Medicine, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Târgu Mureș, 38 Gh. Marinescu Str., 540139 Târgu Mureș, Romania
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12
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Liaropoulou GM, Kamposiora P, Quílez JB, Cantó-Navés O, Foskolos PG. Reverse impression technique: A fully digital protocol for the fabrication of the definitive fixed prosthesis for completely edentulous patients. J Prosthet Dent 2023:S0022-3913(23)00125-7. [PMID: 36964045 DOI: 10.1016/j.prosdent.2023.02.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Revised: 02/13/2023] [Accepted: 02/14/2023] [Indexed: 03/26/2023]
Abstract
In complete arch implant rehabilitation, one of the greatest difficulties still encountered in the digital workflow is the deviation of the implant position during intraoral scanner (IOS) data acquisition. As a result, the passivity of a definitive prosthesis fabricated using IOS data might be compromised. Thus, an implant position verification method is essential, either digitally or conventionally executed. A fully digital protocol for the fabrication of the definitive fixed prosthesis for completely edentulous patients, without the interference of any conventional step within the digital process, is presented. For the verification of the captured position of the scan-bodies, novel scan analogs were connected to the interim prosthesis extraorally and scanned. The virtual superimposition of the interim prosthesis intraorally with the same prosthesis extraorally served as a verification device for the position of the implants.
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Affiliation(s)
- Giolanta M Liaropoulou
- Associate Professor, Department of Restorative Dentistry, School of Dentistry, International University of Catalunya, Barcelona, Spain.
| | - Phophi Kamposiora
- Assistant Professor, Department of Prosthodontics, School of Dentistry, National and Kapodistrian University of Athens, Athens, Greece
| | - Jorge Bertos Quílez
- Associate Professor, Department of Oral and Maxillofacial Surgery, School of Dentistry, International University of Catalunya, Barcelona, Spain
| | - Oriol Cantó-Navés
- Associate Professor, Department of Restorative Dentistry, School of Dentistry, International University of Catalunya, Barcelona, Spain
| | - Pindaros G Foskolos
- Associate Professor, Department of Oral and Maxillofacial Surgery, School of Dentistry, International University of Catalunya, Barcelona, Spain
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In Vivo Analysis of Intraoral Scanner Precision Using Open-Source 3D Software. PROSTHESIS 2022. [DOI: 10.3390/prosthesis4040045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Intraoral three-dimensional scanning techniques could be used to improve dental practice, leading to an improved overall quality of the prosthetic devices and improved comfort for the patient. An accurate and precise intraoral scanner allows proper diagnosis, follow-up evaluation, and prosthesis application. The aim of this research is to evaluate the precision of an intraoral scanners (Medit i500, Medit Corp., Seoul, Korea), using open-source software in the digital workflow. The precision was compared through repetitions of the scanning process of the upper dental arch, following superimpositions in the whole 3D arch area. It was possible to display colorimetric maps for qualitative comparison, and the deviations of the values were classified as clinically acceptable. Within the limitation of this study, the clinically acceptable in vivo frequency of points’ deviation, or the precision, was obtained in 98.8% ± 1.4%; therefore, the use of open-source software can be a viable option in the digital workflow, improving patient follow ups with the 3D model superimposition.
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A digital workflow for pair matching of maxillary anterior teeth using a 3D segmentation technique for esthetic implant restorations. Sci Rep 2022; 12:14356. [PMID: 35999338 PMCID: PMC9399247 DOI: 10.1038/s41598-022-18652-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Accepted: 08/17/2022] [Indexed: 11/09/2022] Open
Abstract
We investigated a state-of-the-art algorithm for 3D reconstruction with a pair-matching technique, which enabled the fabrication of individualized implant restorations in the esthetic zone. This method compared 3D mirror images of crowns and emergence profiles between symmetric tooth pairs in the anterior maxilla using digital slicewise DICOM segmentation and the superimposition of STL data. With the outline extraction of each segment provided by 100 patients, the Hausdorff distance (HD) between two point sets was calculated to identify the similarity of the sets. By using HD thresholds as a pair matching criterion, the true positive rates of crowns were 100, 98, and 98%, while the false negative rates were 0, 2, and 2% for central incisors, lateral incisors, and canines, respectively, indicating high pair matching accuracy (> 99%) and sensitivity (> 98%). The true positive rates of emergence profiles were 99, 100, and 98%, while the false negative rates were 1, 0, and 2% for central incisors, lateral incisors, and canines, respectively, indicating high pair matching accuracy (> 99%) and sensitivity (> 98%). Therefore, digitally flipped contours of crown and emergence profiles can be successfully transferred for implant reconstruction in the maxillary anterior region to optimize esthetics and function.
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Hou X, Xu X, Zhao M, Kong J, Wang M, Lee ES, Jia Q, Jiang HB. An overview of three-dimensional imaging devices in dentistry. J ESTHET RESTOR DENT 2022; 34:1179-1196. [PMID: 35968802 DOI: 10.1111/jerd.12955] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 07/27/2022] [Accepted: 07/28/2022] [Indexed: 12/27/2022]
Abstract
OBJECTIVE To review four types of three-dimensional imaging devices: intraoral scanners, extraoral scanners, cone-beam computed tomography (CBCT), and facial scanners, in terms of their development, technologies, advantages, disadvantages, accuracy, influencing factors, and applications in dentistry. METHODS PubMed (National Library of Medicine) and Google Scholar databases were searched. Additionally, the scanner manufacturers' websites were accessed to obtain relevant data. Four authors independently selected the articles, books, and websites. To exclude duplicates and scrutinize the data, they were uploaded to Mendeley Data. In total, 135 articles, two books, and 17 websites were included. RESULTS Research and clinical practice have shown that oral and facial scanners and CBCT can be used widely in various areas of dentistry with high accuracy. CONCLUSION Although further advancement of these devices is desirable, there is no doubt that digital technology represents the future of dentistry. Furthermore, the combined use of different devices may bring dentistry into a new era. These four devices will play a significant role in clinical utility with high accuracy. The combined use of these devices should be explored further. CLINICAL SIGNIFICANCE The four devices will play a significant role in clinical use with high accuracy. The combined use of these devices should be explored further.
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Affiliation(s)
- Xingyu Hou
- The Conversationalist Club, School of Stomatology, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, Shandong, China
| | - Xiaotong Xu
- The Conversationalist Club, School of Stomatology, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, Shandong, China
| | - Menghua Zhao
- The Conversationalist Club, School of Stomatology, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, Shandong, China
| | - Jiawen Kong
- The Conversationalist Club, School of Stomatology, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, Shandong, China
| | - Mingchang Wang
- The Conversationalist Club, School of Stomatology, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, Shandong, China
| | - Eui-Seok Lee
- Department of Oral and Maxillofacial Surgery, Graduate School of Clinical Dentistry, Korea University, Seoul, Republic of Korea
| | - Qi Jia
- The Conversationalist Club, School of Stomatology, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, Shandong, China
| | - Heng Bo Jiang
- The Conversationalist Club, School of Stomatology, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, Shandong, China
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16
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Digital Workflow for Prosthetically Driven Implants Placement and Digital Cross Mounting: A Retrospective Case Series. PROSTHESIS 2022. [DOI: 10.3390/prosthesis4030029] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Fully digital workflow in implant dentistry is ever increasing. Treatment of partial edentulous cases is well-documented; nevertheless, complete edentulous cases are still a challenge. To present several innovations in the treatment of complete edentulous patients using digital solutions, both for implant placement and restoration delivery, was the objective of this study. It was designed as a retrospective case series study, aimed to tune further research with larger sample size, and a longer follow-up. Patients requiring complete, implant-supported restoration were asked to participate in this study. Enrolled patients were treated with four implants, immediate loading and a definitive complete arch restoration. Patients were treated using computer-assisted, template-based surgery. Multi-piece surgical templates were used to accurately place the implants, to manage the bone if needed and to make immediate loading procedure quicker and easier. After osseointegration period, definitive, extra-oral, digital impressions were taken using newly developed scan analogs, connected in the patient mouth using temporary cylinders and stabilized by means of the low-shrinkage, flowable, resin composite. Outcomes were implant and prosthesis survival rate, complications, accuracy, and patient satisfaction. Radiographic evaluation performed with a preliminary, radiopaque aluminum try-in, was used to test the accuracy of the digital impressions. Overall, 20 implants were placed in five patients. All the implants osseointegrated without complications. One impression was taken a second time due to inaccuracy of the aluminum tray-in. Finally, all of the patients were completely satisfied with both surgical and prosthetic procedures. Within the limitations of this case series, multi-piece surgical templates showed promising results improving the clinician’s confidence in the case of bone reduction, post-extractive implants and immediate loading. The prosthetic template increased the trueness of the digital impression for complete edentulous patients. Finally, even if an impression was performed again, the scan-analog used for extra-oral chair-side digital impressions seemed to be a promising tool. Continuous improvements and further study are needed to confirm these preliminary results.
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Ebeid K, Nouh I, Ashraf Y, Cesar PF. Accuracy of different laboratory scanners for scanning of implant-supported full arch fixed prosthesis. J ESTHET RESTOR DENT 2022; 34:843-848. [PMID: 35441805 DOI: 10.1111/jerd.12918] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Revised: 04/04/2022] [Accepted: 04/09/2022] [Indexed: 11/27/2022]
Abstract
OBJECTIVE This study evaluated the accuracy of different laboratory scanners (LS) for scanning of implant-supported full arch fixed prosthesis with different implant angulations. MATERIALS AND METHODS Two maxillary models that are designed to receive an all-on-four implant retained prosthesis were fabricated then scanned using five different LS. The models were divided into two groups according to the angulation of the posterior implant (Group 1; 30° and group 2; 45°). Each group was then subdivided into five subgroups according to the type of LS, subgroup T; Medit T710, subgroup I; IneosX5, subgroup E; 3ShapeE4, subgroup A; Autoscan DS-Mix, and subgroup M; Ceramill Map600. An industrial 3D scanner was used as reference scanner, then each model was scanned with 5 LS 10 times. Trueness and precision were analyzed using Geomagic 3D analysis software. RESULTS Both scanner type and implant angle had a significant effect on the trueness (p < 0.001). Significant interaction was found between the scanner type and implant angle (p < 0.001). For scanner type tukeys post hoc test revealed highest trueness with the 3Shape E4 (21.3 ± 2.1) and the medit T710 (22.6 ± 2.1) and least trueness with the shining 3D autoscan ds-mix (33.8 ± 3.0). Significantly better trueness was observed with the 30° than the 45° angle. Regarding precision, two-way ANOVA revealed significant effect of the scanner type only (p < 0.001). There were no significant differences between the 3Shape E4, medit T710, Ineos X5, and the Ceramill map600. However, all showed significantly higher precision values when compared to shining 3D autoscan ds-mix. CONCLUSIONS All tested scanners showed results within the clinically acceptable range with 3ShapeE4 and Medit T710 showing the highest accuracy. CLINICAL SIGNIFICANCE Tested scanners can be used for scanning of All-on-four implant supported prosthesis.
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Affiliation(s)
- Kamal Ebeid
- Department of Fixed Prosthodontics, Faculty of Dentistry, Ain Shams University, Cairo, Egypt
| | - Ingy Nouh
- Department of Fixed Prosthodontics, Faculty of Dentistry, Ain Shams University, Cairo, Egypt
| | - Yasmine Ashraf
- Department of Fixed Prosthodontics, Faculty of Dentistry, Ain Shams University, Cairo, Egypt
| | - Paulo F Cesar
- Department of Biomaterials and Oral Biology, Faculty of Dentistry, University of São Paulo, São Paulo, Brazil
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Analysis of the relationship between the surface topography of prepared tooth surfaces and data quality of digital impressions from an intraoral scanner. J Dent Sci 2022; 17:545-550. [PMID: 35028082 PMCID: PMC8740072 DOI: 10.1016/j.jds.2021.07.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 07/16/2021] [Indexed: 11/21/2022] Open
Abstract
Background/purpose With the rise of digitalization in dentistry, intraoral scanners and digital impressions have recently been adopted by many clinicians. The aim of this study was to investigate surface topography of prepared teeth and the accuracy of digital impressions. Materials and methods Twenty mandibular typodonts, containing left first premolar and left first molar abutment teeth manufactured by using CAD/CAM, were used in this study. An intraoral scanner was used to scan each typodont, and each STL file generated was exported in high resolution (Group H), moderate resolution (Group M), and low resolution (Group L). All 60 files were inspected in a 3-D mesh processing software. For each file, the number of triangulation points in the meshwork were obtained for both abutment teeth. Results The measurements obtained from the 3-D mesh processing software revealed that the mean number of triangulation points on the 3-D surface of the abutment teeth (20 premolars + 20 M) were 790,625 ± 98,890 dots in Group H, 592,283 ± 74,881 dots in Group M, and 198,067 ± 19,328 dots in Group L. Significant differences were found between Group H and M (p < 0.05), Group H and L (p < 0.001), and Group M and L (p < 0.01). Conclusion The outcomes of this study reveal that there are strong correlations between the data quality of digital impressions and surface topography of prepared teeth. Therefore, the utilization of STL files in high resolution format is the recommended choice for clinicians engaging in a digital workflow process.
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Pereira ALC, Segundo HVM, Júnior LCA, Germano AR, Carreiro ADFP. Accuracy between intraoral and extraoral scanning: Three-dimensional deviation and effect of distance between implants from two scanning methods. J Indian Prosthodont Soc 2022; 22:279-287. [PMID: 36511059 PMCID: PMC9416955 DOI: 10.4103/jips.jips_108_22] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Aim Evaluate the accuracy between the intraoral and extraoral scanning regarding the three dimensional (3D) deviation and distances between the implants, through 2 scanning methods. Settings and Design An in vitro study. Materials and Methods An edentulous mandibular model was used to install four implants and abutments, recommending 6 distances between the implants. Scans were performed using an intraoral (SI) and extraoral (SE) scanner for each studied group: Scanning with the scan bodies (SB) and device (SD) (n = 10). The files were imported into a surface evaluation program to assess 3D deviations and measure distances between implants. Statistical Analysis Precision was assessed as the difference between files (Kruskal-Wallis test), while trueness was assessed from the difference between scans, applying the Wilcoxon and Mann-Whitney test. Results As for the 3D deviations, SI showed accuracy, for the faces and positions of the implants in relation to the SE, in both scanning methods (P < 0.05). Regarding the capture of distances between implants, the SD scan obtained better trueness than the SB group (P < 0.05). Conclusion We concluded that the type and scanning methods used did not influence the 3D deviations, while for distances, scanning with the device had better trueness.
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Affiliation(s)
| | | | - Luiz Carlos Alves Júnior
- Department of Dentistry, Federal University of Rio Grande Do Norte (UFRN), Natal, Rio Grande do Norte, Brazil
| | - Adriano Rocha Germano
- Department of Dentistry, Federal University of Rio Grande Do Norte (UFRN), Natal, Rio Grande do Norte, Brazil
| | - Adriana Da Fonte Porto Carreiro
- Department of Dentistry, Federal University of Rio Grande Do Norte (UFRN), Natal, Rio Grande do Norte, Brazil,Address for correspondence: Prof. Adriana Da Fonte Porto Carreiro, Department of Dentistry, Federal University of Rio Grande Do Norte (UFRN), AV. Senador Salgado Filho, 1787, Lagoa Nova, Natal 59056-000, Rio Grande Do Norte, Brazil. E-mail:
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Su S, Dudley J. The marginal gaps of lithium disilicate crowns constructed by different scanner and milling unit combinations. Aust Dent J 2021; 67:125-131. [PMID: 34855210 DOI: 10.1111/adj.12891] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 11/28/2021] [Accepted: 11/29/2021] [Indexed: 11/29/2022]
Abstract
BACKGROUND The purpose of this study was to compare the marginal gaps of CAD/CAM lithium disilicate (LDS) crowns constructed using three different scanner and milling unit combinations. METHODS Twenty-four Columbia model lower left molars were prepared for LDS crowns by undergraduate students in a simulated environment. One LDS crown was constructed for each crown preparation using each of the following intraoral scanner/milling unit combinations: TRIOS 3 scanner/E4D milling unit (TRIO/E4DM); TRIOS 3 scanner/Sirona inLab MC X5 milling unit (TRIO/MCX5); E4D scanner/E4D milling unit (E4DS/E4DM). The crowns were seated onto the original crown preparations and three vertical marginal gap measurements taken at four locations (mid-buccal, mid-lingual, mid-mesial and mid-distal) using a stereomicroscope. The mean marginal gap (MMG) was calculated for each crown and each individual tooth surface. RESULTS The TRIO/MCX5 scanner/milling unit combination produced the smallest MMG of 63.73 ± 47.38 μm followed by E4DS/E4DM (88.64 ± 106.51 μm) and TRIO/E4DM (107.41 ± 76.47 μm). There was a significant effect of milling unit (p < 0.0001) on MMG but no significant effect of scanner (p = 0.070) or location (p = 0.182). CONCLUSIONS The newer scanner/milling unit combination produced LDS crowns with the smallest MMG. All scanner/milling unit combinations produced LDS crowns within a clinically acceptable MMG.
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Affiliation(s)
- Sinclair Su
- Adelaide Dental School, Adelaide Health & Medical Sciences, The University of Adelaide, South Australia, Australia
| | - James Dudley
- Adelaide Dental School, The University of Adelaide, South Australia, Australia
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The Influence of Laboratory Scanner Versus Intra-Oral Scanner on Determining the Implant Axis by Using Three Different Scan Abutments. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11188543] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Background: The purpose of this in vitro study was to compare the implant axis’ spatial position and orientation by using laboratory scanner versus intra-oral scanner with three different scan abutments. Methods: A 3D model was printed with an internal hex implant analog in the place of teeth 35#. Three standard scan abutments were used: MIS (two-piece titanium), AB (two-piece PEEK and titanium base) and ZZ (one-piece PEEK). Each scan abutment was scanned 30 times by TRIOS E3 (laboratory scanner) and 30 times by Omnicam (intra-oral scanner). For each scan, an STL (stereolithography) file was created, and the spatial characterization of each scan abutment was measured in the X, Y, Z coordinates, and rotational and longitudinal angles. The comparison between all the scans was conducted by superimposition of the STL files, using a 3D software. A t-test and Wilcoxon signed-rank test were used. (p < 0.05) Results: Only the MIS scan abutment showed no statistical difference in the X and Z axes. (p < 0.05). All other scan abutments showed a statistical difference in all axes. The rotational angle of the AB scan abutment was twice the angle of the MIS and ZZ scan abutments. Conclusions: All three scan abutments showed a rotational deviation of the implant axis between the laboratory scanner and the intra-oral scanner. The AB scan abutment showed the greatest deviation (1.04 degrees) while the other two abutments showed deviations of about half a degree in relation to the laboratory scan abutment. There is a need for further studies which will examine the influence of geometry, material, and scan abutment parts on the accuracy of the scan obtained.
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Ellakany P, Tantawi ME, Mahrous AA, Al-Harbi F. Evaluation of the Accuracy of Digital Impressions Obtained from Intraoral and Extraoral Dental Scanners with Different CAD/CAM Scanning Technologies: An In Vitro Study. J Prosthodont 2021; 31:314-319. [PMID: 34085355 DOI: 10.1111/jopr.13400] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/01/2021] [Indexed: 11/28/2022] Open
Abstract
PURPOSE To compare the accuracy of intraoral and extraoral scanners (IOSs and EOSs) with different scanning technologies. MATERIAL AND METHODS A phantom cast was used to simulate the patient's mouth. Polyether impression was made of the phantom cast and poured to fabricate stone casts. The stone casts were scanned by two IOSs (3shape Trios 3, 3S and Dental Wings, DW) and two EOSs (S600 Arti Zirkonzahn, ZK and Ceramill map 600 Amann Girrbach, AG) to obtain digital casts. Reference teeth (canines, premolar, and molars) dimensions were measured on the digital casts by Geomagic software and compared to measurements of the stone cast done by stereomicroscope. The dimensions were occluso-cervical mesio-distal, and bucco-lingual and their average was calculated. Differences between digital and stereoscopic measurements were assessed using paired t-test. Discrepancies between these measurements were calculated as differences and were compared among the four scanners using ANOVA. RESULTS The differences among the discrepancies of the four scanners were not significant overall (p = 0.969), in premolars (p = 0.932) or molars (p = 0.069) but significant in canines (p = 0.025). The discrepancies of the EOSs were ≤0.01 mm in canines and molars. DW had the greatest discrepancy in canines and molars. CONCLUSIONS The IOSs and EOSs had similar accuracy except in canines where EOSs performed better. The accuracy of scanning is affected by the smoothness and regularity of the teeth surfaces as in case of the canine.
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Affiliation(s)
- Passent Ellakany
- Department of Substitutive Dental Sciences, College of Dentistry, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
| | - Maha El Tantawi
- Department of Pediatric Dentistry and Dental Public Health, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
| | - Amr A Mahrous
- Department of Substitutive Dental Sciences, College of Dentistry, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
| | - Fahad Al-Harbi
- Department of Substitutive Dental Sciences, College of Dentistry, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
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Marginal and Internal Fit of Ceramic Restorations Fabricated Using Digital Scanning and Conventional Impressions: A Clinical Study. J Clin Med 2020; 9:jcm9124035. [PMID: 33327402 PMCID: PMC7764839 DOI: 10.3390/jcm9124035] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 12/09/2020] [Accepted: 12/11/2020] [Indexed: 11/17/2022] Open
Abstract
This clinical study was designed with the aim of fabricating four ceramic crowns using the conventional method and digital methods with three different intraoral scanners and evaluate the marginal and internal fit as well as clinician satisfaction. We enrolled 20 subjects who required ceramic crowns in the upper or lower molar or the premolar. Impressions were obtained using digital scans, with conventional impressions (polyvinyl siloxane and desktop scanner) and three different intraoral scanners (EZIS PO, i500, and CS3600). Four lithium disilicate glass-ceramic crowns were fabricated for each patient. In the oral cavity, the proximal and occlusal adjustments were performed, and the marginal fit and internal fit were evaluated using the silicone replica technique. The clinician satisfaction score of the four crowns was evaluated as per the evaluations of the proximal and occlusal contacts made during the adjustment process and the marginal and internal fit. For statistical analysis, the differences among the groups were analyzed with one-way analysis of variance and Tukey HSD test as a post-test; Pearson correlation analysis was used for analyzing the correlations (α = 0.05). There was a significant difference in the marginal and internal fit of the ceramic crowns fabricated using three intraoral scanner types and one desktop scanner type (p < 0.001); there was a significant difference in the clinician satisfaction scores (p = 0.04). The clinician satisfaction score and marginal fit were significantly correlated (absolute marginal discrepancy and marginal gap) (p < 0.05). An impression technique should be considered for fabricating a ceramic crown with excellent goodness-of-fit. Further, higher clinician satisfaction could be obtained by reproducing the excellent goodness-of-fit using the intraoral scanning method as compared to the conventional method.
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