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Tasaka A, Mori R, Hirabayashi T, Kogawa S, Ito K, Wadachi J, Yamashita S. A new proposal for the workflow using CAD/CAM technology for fabrication of resin-based removable partial dentures. J Prosthodont Res 2024; 68:355-357. [PMID: 37853626 DOI: 10.2186/jpr.jpr_d_23_00153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2023]
Affiliation(s)
- Akinori Tasaka
- Department of Removable Partial Prosthodontics, Tokyo Dental College, Tokyo, Japan
| | - Ryota Mori
- Ceramotec System Company Limited, Kitakyushu, Japan
| | - Takeshi Hirabayashi
- Dental Laboratory of Suidoubashi Hospital, Tokyo Dental College, Tokyo, Japan
| | - Sato Kogawa
- Department of Removable Partial Prosthodontics, Tokyo Dental College, Tokyo, Japan
| | - Kosei Ito
- Department of Removable Partial Prosthodontics, Tokyo Dental College, Tokyo, Japan
| | - Juro Wadachi
- Department of Removable Partial Prosthodontics, Tokyo Dental College, Tokyo, Japan
| | - Shuichiro Yamashita
- Department of Removable Partial Prosthodontics, Tokyo Dental College, Tokyo, Japan
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Peng PW, Chen MS, Peng TY, Huang PC, Nikawa H, Lee WF. In vitro study of optimal removable partial denture clasp design made from novel high-performance polyetherketoneketone. J Prosthodont Res 2024; 68:466-473. [PMID: 38220161 DOI: 10.2186/jpr.jpr_d_23_00080] [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] [Indexed: 01/16/2024]
Abstract
PURPOSE This study aimed to investigate the retentive force and deformation of double Akers' polyetherketoneketone (PEKK) clasps on removable partial dentures (RPDs) with varying designs and undercut depths. METHODS Thirty double Akers' PEKK clasps with two different widths and heights (Groups I and II) were fabricated using computer-aided design and computer-aided manufacturing (CAD/CAM). Each design was further subdivided (n = 5) into three undercut depths (0.25, 0.50, and 0.75 mm). The retentive force of the clasps was measured after 10 years of clinical use (15,000 insertion/removal cycles), and the deformation of the clasp tips was analyzed before and after cycling. RESULTS Clasps with 0.50-mm and 0.75-mm undercut depths exhibited greater initial retentive forces (3.15-3.51 N) compared to those in the 0.25-mm undercut group (2.40-2.80 N). Group I maintained consistent retentive forces over the cycles (P = 0.345), whereas Group II showed declining forces after the initial use (P < 0.003). In both groups, the 0.50-mm undercut exhibited a greater retentive force than the 0.25-mm (P < 0.001 and P < 0.004, respectively), with no significant differences between the 0.50-mm and 0.75-mm undercut depths. Despite a lower initial retentive force, the 0.25-mm undercut showed less deformation and clasp tip wear. CONCLUSIONS The PEKK clasps did not exhibit significantly reduced retentive forces or permanent deformations after 15,000 fatigue cycles. These results suggest that the PEKK polymer displays superior mechanical properties as an esthetic clasp material, and clasps with 0.50-mm and 0.75-mm undercut depths are recommended for long-term clinical use.
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Affiliation(s)
- Pei-Wen Peng
- School of Dental Technology, Taipei Medical University, Taipei, Taiwan
| | - May-Show Chen
- School of Dentistry, Taipei Medical University, Taipei, Taiwan
- Division of Prosthodontics, Department of Dentistry, Taipei Medical University Hospital, Taipei, Taiwan
| | - Tzu-Yu Peng
- School of Dentistry, Taipei Medical University, Taipei, Taiwan
| | - Peng-Chien Huang
- School of Dental Technology, Taipei Medical University, Taipei, Taiwan
| | - Hiroki Nikawa
- Department of Oral Biology & Engineering, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima City, Hiroshima, Japan
| | - Wei-Fang Lee
- School of Dental Technology, Taipei Medical University, Taipei, Taiwan
- School of Dentistry, Taipei Medical University, Taipei, Taiwan
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Jamjoom FZ, Aldghim A, Aldibasi O, Yilmaz B. In vitro evaluation of the impact of intraoral scanner, scanning aids, and the scanned arch on the scan accuracy of edentulous arches. J Prosthodont 2024. [PMID: 38953541 DOI: 10.1111/jopr.13891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Accepted: 05/22/2024] [Indexed: 07/04/2024] Open
Abstract
PURPOSE To assess the accuracy of complete maxillary and mandibular edentulous arch scans obtained using two different intraoral scanners (IOSs), with and without scanning aids, and to compare these results to those obtained using conventional impression methods. MATERIALS AND METHODS Two IOSs were used (TRIOS 4 [TRI] and Emerald S [EMR]) to scan maxillary and mandibular typodonts. The typodonts were scanned without scanning aids [TRI_WSA and EMR_WSA groups] (n = 10). The typodonts were then scanned under four scanning aid conditions (n = 10): composite markers [TRI_MRK and EMR_MRK groups], scanning spray [TRI_SPR and EMR_SPR groups], pressure indicating paste [TRI_PIP and EMR_PIP groups], and liquid-type scanning aid [TRI_LQD and EMR_LQD groups]. Conventional impressions of both arches were also made using irreversible hydrocolloids in stock trays [IHC] and using polyvinyl siloxane (PVS) impression material in custom trays (n = 10) which were digitized using a laboratory scanner. Using a metrology software program, all scans were compared to a reference scan in order to assess trueness and to each other to assess precision. Trueness and precision were expressed as the root mean square (RMS) of the absolute deviation values and the statistical analysis was modeled on a logarithmic scale using fixed-effects models to meet model assumptions (α = 0.05). RESULTS The main effect of arch (p = 0.004), scanner (p < 0.001), scanning aid (p = 0.041), and the interaction between scanner and scanning aid (p = 0.027) had a significant effect on mean RMS values of trueness. The arch (p = 0.015) and scanner (p < 0.001) had a significant effect on the mean RMS values of precision. The maxillary arch had better accuracy compared to the mandible. The TRIOS 4 scanner had better accuracy than both the Emerald S scanner and conventional impressions. The Emerald S had better precision than conventional impressions. The scanning spray and liquid-type scanning aids produced the best trueness with the TRIOS 4 scanner, while the liquid-type scanning aid and composite markers produced the best trueness for the Emerald S scanner. CONCLUSION The scanned arch and the type of scanner had a significant effect on the accuracy of digital scans of completely edentulous arches. The scanning aid had a significant effect on the trueness of digital scans of completely edentulous arches which varied depending on the scanner used.
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Affiliation(s)
- Faris Z Jamjoom
- Restorative and Prosthetic Dental Science Department, College of Dentistry, King Saud Bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
- King Abdullah International Medical Research Center (KAIMRC), Riyadh, Saudi Arabia
| | - Adhwaa Aldghim
- King Abdullah International Medical Research Center (KAIMRC), Riyadh, Saudi Arabia
- College of Dentistry, King Saud Bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
| | - Omar Aldibasi
- Department of Biostatistics and Bioinformatics, King Abdullah International Medical Research Center (KAIMRC), Riyadh, Saudi Arabia
- King Saud Bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
| | - Burak Yilmaz
- Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland
- Department of Restorative, Preventive and Pediatric Dentistry, School of Dental Medicine, University of Bern, Bern, Switzerland
- Division of Restorative and Prosthetic Dentistry, The Ohio State University, Columbus, Ohio, USA
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Azevedo L, Marques T, Karasan D, Fehmer V, Sailer I, Correia A, Gómez-Polo M. Effect of splinting scan bodies on the trueness of complete arch digital implant scans with 5 different intraoral scanners. J Prosthet Dent 2024; 132:204-210. [PMID: 37537105 DOI: 10.1016/j.prosdent.2023.06.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 06/13/2023] [Accepted: 06/14/2023] [Indexed: 08/05/2023]
Abstract
STATEMENT OF PROBLEM The absence of fixed reference points can affect the trueness of complete arch intraoral digital implant scans. The effect of splinting intraoral scan bodies (ISBs) or the inclusion of artificial landmarks (AL) on the trueness of complete arch digital implant scans is still unclear. PURPOSE The purpose of this study was to analyze the effect of splinting ISBs or the inclusion of AL on the trueness of complete arch digital implant scans with 5 intraoral scanners (IOSs). MATERIAL AND METHODS Six tissue-level dental implants (Straumann Tissue Level) were placed in an edentulous patient, and the correspondent definitive cast was digitized with a desktop scanner (IScan4D LS3i) to obtain the reference digital cast. Digital scans (n=10) were performed with 5 IOSs: TRIOS 4, Virtuo Vivo, Medit i700, iTero Element 5D, and Cerec Primescan. Three different scanning techniques were evaluated: conventional (cIOSs), splinted (sIOSs), and AL (AL-IOSs). The scan data obtained were imported into a metrology software program and superimposed to the reference digital cast by using a best-fit algorithm. The overall deviations of the positions of the ISBs were evaluated by using the root-mean-square (RMS) error (α=.05). RESULTS The mean ±standard deviation trueness values for the cIOSs, sIOSs, and AL-IOSs groups were 48 ±8 µm, 53 ±7 µm, and 49 ±11 µm, respectively, with no statistically significant differences (P=.06). Significant differences were found for the IOSs used with each technique (P<.001). Primescan (27 ±4 µm cIOSs; 28 ±3 µm sIOSs; 31 ±3 µm AL-IOSs) showed significantly higher trueness than iTero 5D (47 ±5 µm cIOSs; 47 ±4 µm sIOSs; 50 ±6 µm AL-IOSs) (P=.002) and TRIOS 4 (93 ±18 µm cIOSs; 76 ±18 µm sIOSs; 107 ±13 µm AL-IOSs) (P=.001) for all techniques. In addition, no significant differences were found between the techniques by using iTero 5D or Primescan (P=.348 and P=.059, respectively). CONCLUSIONS The cIOSs, sIOSs, and AL-IOSs techniques showed similar trueness. The IOS used influenced the trueness of complete arch digital implant scans.
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Affiliation(s)
- Luís Azevedo
- PhD candidate, Department of Conservative Dentistry and Orofacial Prostheses, Faculty of Dentistry, Complutense University of Madrid, Madrid, Spain; Researcher, Center for Interdisciplinary Research in Health, Universidade Católica Portuguesa (UCP), Viseu, Portugal; and Research Assistant, Division of Fixed Prosthodontics and Biomaterials, University Clinics for Dental Medicine, University of Geneva, Geneva, Switzerland.
| | - Tiago Marques
- Lecturer, Faculty of Dental Medicine, Universidade Católica Portuguesa (UCP), Viseu, Portugal; and Researcher, Center for Interdisciplinary Research in Health, The Catholic University of Portugal (UCP), Viseu, Portugal
| | - Duygu Karasan
- Assistant, Division of Fixed Prosthodontics and Biomaterials, University Clinics for Dental Medicine, University of Geneva, Geneva, Switzerland
| | - Vincent Fehmer
- Master Dental Technician, Division of Fixed Prosthodontics and Biomaterials, University Clinics for Dental Medicine, University of Geneva, Geneva, Switzerland
| | - Irena Sailer
- Head, Division of Fixed Prosthodontics and Biomaterials, University Clinics for Dental Medicine, University of Geneva, Geneva, Switzerland
| | - André Correia
- Assistant Professor, Faculty of Dental Medicine, Universidade Católica Portuguesa (UCP), Viseu, Portugal; and Researcher, Center for Interdisciplinary Research in Health, The Catholic University of Portugal (UCP), Viseu, Portugal
| | - Miguel Gómez-Polo
- Associate Professor, Faculty of Dentistry, Department of Conservative Dentistry and Orofacial Prostheses, Complutense University of Madrid, Madrid, Spain
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Jamjoom FZ, Aldghim A, Aldibasi O, Yilmaz B. Impact of intraoral scanner, scanning strategy, and scanned arch on the scan accuracy of edentulous arches: An in vitro study. J Prosthet Dent 2024; 131:1218-1225. [PMID: 36841708 DOI: 10.1016/j.prosdent.2023.01.027] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 01/23/2023] [Accepted: 01/25/2023] [Indexed: 02/27/2023]
Abstract
STATEMENT OF PROBLEM The scanning strategy used when making complete arch digital scans affects the accuracy of the scan, and the accuracy of the strategy may be influenced by the scanner used. However, these effects have not been investigated thoroughly with complete arch edentulous scanning. PURPOSE The purpose of this in vitro study was to determine the effect of scanning strategies and the scanned arch on the accuracy of complete arch edentulous scans using 2 intraoral scanner (IOS) systems. MATERIAL AND METHODS Two IOSs were used (TRIOS 4 and Emerald S) to scan maxillary and mandibular typodonts using 6 scanning strategies (test scans), and conventional impressions of both arches were also made. By using a metrology software program, test scans were superimposed onto a reference scan, and the root mean square (RMS) of the absolute deviation values was calculated to express trueness. The sample with the best trueness was used as reference onto which the remaining samples from the same group were superimposed, and the RMS of the absolute deviation values was calculated to express precision. Statistical modeling was applied using the fixed effects models (α=.05). RESULTS The main effects of scanner and strategy significantly impacted the trueness RMS values (P<.001), with significant interactions between them (P=.012). The main effects of scanner, strategy, and arch significantly impacted the precision of RMS values (P=.004), (P=.033), and (P=.023). Conventional impressions and the TRIOS 4 scanner had comparable accuracy, while the Emerald S scanner was inferior to both. P-O-B had the highest overall accuracy and strategy ZZ had the worst. Better precision was found with the maxillary arch. CONCLUSIONS The scanner type and scanning strategy significantly impacted the accuracy of the digital scans of completely edentulous arches, with a significant interaction between scanner and strategy. The arch being scanned had a significant effect on scan precision but not on scan trueness.
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Affiliation(s)
- Faris Z Jamjoom
- Assistant Professor, Restorative and Prosthetic Dental Science Department, College of Dentistry, King Saud Bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia; King Abdullah International Medical Research Center (KAIMRC), Riyadh, Saudi Arabia.
| | - Adhwaa Aldghim
- Dental Student, College of Dentistry, King Saud Bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia; King Abdullah International Medical Research Center (KAIMRC), Riyadh, Saudi Arabia
| | - Omar Aldibasi
- Biostatistician, Department of Biostatistics and Bioinformatics, King Abdullah International Medical Research Center (KAIMRC), Riyadh, Saudi Arabia; King Saud Bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
| | - Burak Yilmaz
- Associate Professor, Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland; Associate Professor, Department of Restorative, Preventive and Pediatric Dentistry, School of Dental Medicine, University of Bern, Bern, Switzerland; Adjunct Professor, Division of Restorative and Prosthetic Dentistry, The Ohio State University, Columbus, Ohio
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Wang X, Zhang F, Ma D, Ye X, Zheng X, Ren R, Ren N, Bai S. Evaluation of the accuracy of seven intraoral scanners for the full dentate and partially edentulous complete-arch mandibular casts: An in vitro comparison. Heliyon 2024; 10:e31063. [PMID: 38803930 PMCID: PMC11128860 DOI: 10.1016/j.heliyon.2024.e31063] [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: 07/24/2023] [Revised: 04/11/2024] [Accepted: 05/09/2024] [Indexed: 05/29/2024] Open
Abstract
Statement of problem Intraoral scanners (IOSs) are widely used in dentistry, providing high accuracy in short-range scanning. Nevertheless, when scanning the full dental arch, it remains a challenge. Furthermore, there is a lack of studies reporting the differences in scan accuracy between dental arches with large-span mucosal areas and fully dentate casts or optimal IOS selection for different dental statuses. Purpose This study aimed to evaluate the accuracy and scanning time of different IOSs for full dentate (FD) and partially edentulous (PE) casts with missing teeth in the #34-#44 range and to determine the IOSs with the optimal clinical adaptability and scanning accuracy for different complete-arch casts. Material and methods Reference scans of two complete-arch (FD and PE) casts were obtained using a laboratory scanner (Ceramill Map 600). Subsequently, the same casts were scanned ten times each by seven IOSs (3Shape Trios 3, CS3600, Planmeca Emerald, iTero Element 5D, Medit i500, BAMBOO B1, and Shining Aoralscan 3), and the scanning time was recorded. The test data were superimposed on the reference scans for the selected areas, and three-dimensional deviations between the reference and test casts (trueness), and between test casts (precision) were determined using reverse engineering software (Geomagic Wrap). The dataset was analyzed using a two-factor analysis of variance with post-hoc Bonferroni tests. Results Two-factor analysis of variance revealed significant differences in accuracy and scanning time for different casts (P < 0.001) and IOSs (P < 0.001). For the FD cast, the i500 (0.35 ± 0.11 mm trueness) and CS3600 (0.23 ± 0.12 mm precision) performed worse than the remaining scanners. For the PE cast, the BAMBOO B1(0.89 ± 0.58 mm trueness; 0.88 ± 0.48 mm precision) performed worse than the remaining scanners. There were no differences in the accuracy of scanning between the Element 5D and Emerald for both cast types. However, the scanning time differed significantly between the different IOSs (P < 0.001). Regardless of the cast type, the fastest and slowest scans were performed by the Trios3 and CS3600 scanners respectively. Conclusions The accuracy and scanning time differed between the different IOSs and types of complete-arch casts.
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Affiliation(s)
- Xin Wang
- State Key Laboratory of Oral and Maxillofacial Reconstruction and Regeneration & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Digital Center, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Fang Zhang
- State Key Laboratory of Oral and Maxillofacial Reconstruction and Regeneration & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Digital Center, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Dan Ma
- State Key Laboratory of Oral and Maxillofacial Reconstruction and Regeneration & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Digital Center, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Xiaolan Ye
- State Key Laboratory of Oral and Maxillofacial Reconstruction and Regeneration & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Digital Center, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Xiaojuan Zheng
- State Key Laboratory of Oral and Maxillofacial Reconstruction and Regeneration & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Digital Center, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Ruifang Ren
- State Key Laboratory of Oral and Maxillofacial Reconstruction and Regeneration & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Digital Center, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Nan Ren
- State Key Laboratory of Oral and Maxillofacial Reconstruction and Regeneration & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Digital Center, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Shizhu Bai
- State Key Laboratory of Oral and Maxillofacial Reconstruction and Regeneration & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Digital Center, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, China
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Wang Y, Li Y, Liang S, Yuan F, Liu Y, Ye H, Zhou Y. THE ACCURACY OF INTRAORAL SCAN IN OBTAINING DIGITAL IMPRESSIONS OF EDENTULOUS ARCHES: A SYSTEMATIC REVIEW. J Evid Based Dent Pract 2024; 24:101933. [PMID: 38448118 DOI: 10.1016/j.jebdp.2023.101933] [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: 06/19/2023] [Revised: 09/28/2023] [Accepted: 10/10/2023] [Indexed: 03/08/2024]
Abstract
OBJECTIVES Accuracy is a crucial factor when assessing the quality of digital impressions. This systematic review aims to assess the accuracy of intraoral scan (IOS) in obtaining digital impressions of edentulous jaws. METHODS This systematic review adhered to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) and was registered in the International Prospective Register of Systematic Reviews (PROSPERO ID: CRD42022382983). A thorough retrieval of 7 electronic databases was undertaken, encompassing MEDLINE (PubMed), Web of Science, EMBASE, Scopus, Cochrane Library, Virtual Health Library, and Open gray, through September 11, 2023. A snowball search was performed by tracing the reference lists of the included studies. The Population, Intervention, Comparison, and Outcome (PICO) question of this systematic review was: "What is the accuracy of intraoral scan in obtaining digital impressions of edentulous arches?" The Modified Methodological Index for Nonrandomized Studies (MINORS) was employed to assess the risk of bias. RESULTS Among the studies retrieved from databases and manual search, a total of 25 studies were selected for inclusion in this systematic review, including 9 in vivo and 16 in vitro studies. Twenty-one of the included studies utilized the 3D deviation analysis method, while 4 studies employed the linear or angular deviation analysis method. The accuracy results of in vitro studies indicated a trueness range of 20-600 μm and a precision range of 2-700 μm. Results of in vivo studies indicated a trueness range of 40-1380 μm, while the precision results were not reported. CONCLUSION According to the results of this study, direct digital impressions by IOS cannot replace the conventional impressions of completely edentulous arches in vivo. Edentulous digital impressions by IOS demonstrated poor accuracy in peripheral areas with mobile tissues, such as the soft palate, vestibular sulcus, and sublingual area.
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Affiliation(s)
- Yiyang Wang
- 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, Digital Medical Devices, Beijing Key Laboratory of Digital Stomatology, Beijing, P.R. China
| | - Yaning Li
- 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, Digital Medical Devices, Beijing Key Laboratory of Digital Stomatology, Beijing, P.R. China
| | - Shanshan Liang
- Center of Digital Dentistry, Second Clinical Division, 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, Digital Medical Devices, Beijing Key Laboratory of Digital Stomatology, Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health, Beijing, P.R. China
| | - Fusong Yuan
- Center of Digital Dentistry, 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, Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health, Beijing, P.R. China
| | - Yunsong Liu
- 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, Digital Medical Devices, Beijing Key Laboratory of Digital Stomatology, Beijing, P.R. China
| | - Hongqiang Ye
- 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, Digital Medical Devices, Beijing Key Laboratory of Digital Stomatology, Beijing, P.R. China.
| | - Yongsheng Zhou
- 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, Digital Medical Devices, Beijing Key Laboratory of Digital Stomatology, Beijing, P.R. China
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Vo HM, Huynh NCN, Tran TTN, Hoang HT, Nguyen ATL. Influence of titanium dioxide and composite on the accuracy of an intraoral scanner for bilateral upper posterior edentulous jaw (Kennedy class I) scanning: An in vitro study. J Dent 2023; 139:104747. [PMID: 37863172 DOI: 10.1016/j.jdent.2023.104747] [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: 07/28/2023] [Revised: 10/10/2023] [Accepted: 10/18/2023] [Indexed: 10/22/2023] Open
Abstract
OBJECTIVES The accuracy of 3-dimensional images produced by the intraoral scanner (IOS) is affected by scanning-aid materials. This in vitro study aimed to elucidate the influence of scanning-aid materials on the accuracy (trueness and precision) of digital scanning on the bilateral upper posterior edentulous jaw (Kennedy class I). METHODS The asymmetrical bilateral upper posterior edentulous model (reference model) was generated using a 3D printer with three groups (application of TiO2 powder - composite and no-treatment control). The experimental scans were executed (n = 10 per group) using TRIOS3 (3shape), while one reference scan was obtained by an industrial scanner (Solutionix - C500). Values of trueness and precision were evaluated using the 3D superimposition method on mean deviation values. The accuracy was assessed using mean deviation values following the 3D superimposition method. RESULTS IOS had high trueness (20.6 µm), and significant differences were found between the no-treatment and TiO2 groups. Considering the cut-off value of deviations as 300 µm for clinical acceptability, the analysis clarified the most variations in the control group. There was a significant difference between the no-treatment group and others in the maxillary tuberosity area relating to long-span edentulous. The composite group had the best precision values (1.1 µm). Significant differences were found between composite and TiO2 groups (2.7 µm). CONCLUSIONS The bilateral upper posterior edentulous jaw digital impressions obtained using IOS were accurate. However, the digital images in the palate and maxillary tuberosity area related to long-span edentulous differed significantly. TiO2-containing powder and composite landmarks affected the accuracy and stability of the IOS. CLINICAL SIGNIFICANCE Scanning aid materials can increase the accuracy of the bilateral upper posterior edentulous jaw scanning with IOS.
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Affiliation(s)
- Hung Manh Vo
- Faculty of Odonto-Stomatology, University of Medicine and Pharmacy at Ho Chi Minh City, 652 Nguyen Trai, Ward 11, District 5, Ho Chi Minh City 749000, Vietnam
| | - Nam Cong-Nhat Huynh
- Faculty of Odonto-Stomatology, University of Medicine and Pharmacy at Ho Chi Minh City, 652 Nguyen Trai, Ward 11, District 5, Ho Chi Minh City 749000, Vietnam.
| | - Trang Thi-Ngoc Tran
- Faculty of Odonto-Stomatology, University of Medicine and Pharmacy at Ho Chi Minh City, 652 Nguyen Trai, Ward 11, District 5, Ho Chi Minh City 749000, Vietnam
| | - Hung Trong Hoang
- Faculty of Odonto-Stomatology, University of Medicine and Pharmacy at Ho Chi Minh City, 652 Nguyen Trai, Ward 11, District 5, Ho Chi Minh City 749000, Vietnam
| | - Anh Thi-Lan Nguyen
- Faculty of Odonto-Stomatology, University of Medicine and Pharmacy at Ho Chi Minh City, 652 Nguyen Trai, Ward 11, District 5, Ho Chi Minh City 749000, Vietnam
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Srivastava G, Padhiary SK, Mohanty N, Molinero-Mourelle P, Chebib N. Accuracy of Intraoral Scanner for Recording Completely Edentulous Arches-A Systematic Review. Dent J (Basel) 2023; 11:241. [PMID: 37886926 PMCID: PMC10605168 DOI: 10.3390/dj11100241] [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: 08/24/2023] [Revised: 10/02/2023] [Accepted: 10/10/2023] [Indexed: 10/28/2023] Open
Abstract
Scanning edentulous arches during complete denture fabrication is a crucial step; however, the quality of the resulting digital scan is still questionable. The purpose of this study is to systematically review studies (both clinical and in vitro) and determine whether intraoral scanners have clinically acceptable accuracy when recording completely edentulous arches for the fabrication of removable complete dentures. An electronic search in medical databases like PubMed, Scopus, and Web of Science (WOS), using a combination of relevant keywords, retrieved 334 articles. After full-text evaluation, twelve articles fulfilled the inclusion criteria for this review (eight clinical studies and four in vitro studies). A quality analysis of the included studies was carried out using the QUADAS-2 tool. The accuracy values varied between different intraoral scanners. Different regions of the edentulous arches showed differences in trueness and precision values in both in vitro and clinical studies. Peripheral borders, the inner seal, and poorly traceable structures like the soft palate showed maximum discrepancies. The accuracy of intraoral scanners in recording clear anatomic landmarks like hard tissues with attached mucosa was comparable to conventional edentulous arch impressions. However, higher discrepancies were recorded when digitizing mobile and poorly traceable structures. Intraoral scanners can be used to digitize denture-bearing areas, but the interpretation of the peripheral border and the soft palate should be carefully carried out.
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Affiliation(s)
- Gunjan Srivastava
- Department of Prosthodontics, Institute of Dental Sciences, Siksha ‘O’ Anusandhan, Deemed To Be University, Bhubaneswar 751003, Odisha, India;
| | - Subrat Kumar Padhiary
- Department of Oral and Maxillofacial Surgery, Institute of Dental Sciences, Siksha ‘O’ Anusandhan, Deemed To Be University, Bhubaneswar 751003, Odisha, India;
| | - Neeta Mohanty
- Department of Oral Pathology and Microbiology, Institute of Dental Sciences, Siksha ‘O’ Anusandhan, Deemed To Be University, Bhubaneswar 751003, Odisha, India;
| | - Pedro Molinero-Mourelle
- Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, 3010 Bern, Switzerland;
| | - Najla Chebib
- Division of Gerodontology and Removable Prosthodontics, University Clinics of Dental Medicine, University of Geneva, 1205 Geneva, Switzerland
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Sakamoto K, Wada J, Arai Y, Hayama H, Ishioka Y, Kim EY, Kazama R, Toyoshima Y, Wakabayashi N. Effect of abutment tooth location on the accuracy of digital impressions obtained using an intraoral scanner for removable partial dentures. J Prosthodont Res 2023; 67:531-538. [PMID: 36775339 DOI: 10.2186/jpr.jpr_d_22_00201] [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] [Indexed: 02/12/2023]
Abstract
PURPOSE To verify the effect of abutment tooth location on the accuracy of digital impressions obtained using an intraoral scanner (IOS) for removable partial dentures (RPDs). METHODS The target abutment teeth included the left first premolar (#34), second molar (#37), and right second premolar (#45) in a mandibular Kennedy class II model and the left and right second molars (#37, #47) in a class III model. Only #37 was isolated from the remaining teeth by the mucosal area in both models. Digital impressions were obtained using a desktop scanner (reference data) and an IOS (IOS data; scanning origin #37; n=10). The general trueness based on the entire model superimposition (TG), local trueness (TL) of an individual tooth, and dimensional accuracy (coordinate and linear accuracy) of the IOS data of the target abutment teeth were compared (α=0.05). RESULTS In both models, #37 showed significantly inferior TG (P<0.01), superior TL (P<0.01), and mesial coordinate displacement (P<0.01 and P<0.05 in class II and III models, respectively). Intra-model comparisons showed that #45 in the class II model and #47 in the class III model had significantly inferior linear accuracy (P<0.05 and P<0.01, respectively) and buccal coordinate displacement (P<0.05 and P<0.01, respectively) compared with the other target teeth. CONCLUSIONS In digital impressions of RPDs, isolation of abutment teeth by mucosal areas can reduce general trueness based on the entire dental arch and mesial tooth displacement, whereas increased distance from the scanning origin can adversely affect local trueness and dimensional accuracy.
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Affiliation(s)
- Kazuki Sakamoto
- Department of Advanced Prosthodontics, Graduate School, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - Junichiro Wada
- Department of Advanced Prosthodontics, Graduate School, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
- Department of Biomaterials Science and Turku Clinical Biomaterials Center - TCBC, Institute of Dentistry, University of Turku, Turku, Finland
| | - Yuki Arai
- Department of Advanced Prosthodontics, Graduate School, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
- Department of Orthodontics, University of Texas Health Science Center at Houston School of Dentistry, Houston, TX, United States
| | - Hironari Hayama
- Department of Advanced Prosthodontics, Graduate School, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - Yurika Ishioka
- Department of Advanced Prosthodontics, Graduate School, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - Eung-Yeol Kim
- Department of Advanced Prosthodontics, Graduate School, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - Ryunosuke Kazama
- Department of Advanced Prosthodontics, Graduate School, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - Yusuke Toyoshima
- Department of Advanced Prosthodontics, Graduate School, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - Noriyuki Wakabayashi
- Department of Advanced Prosthodontics, Graduate School, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
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Vitai V, Németh A, Sólyom E, Czumbel LM, Szabó B, Fazekas R, Gerber G, Hegyi P, Hermann P, Borbély J. Evaluation of the accuracy of intraoral scanners for complete-arch scanning: A systematic review and network meta-analysis. J Dent 2023; 137:104636. [PMID: 37516338 DOI: 10.1016/j.jdent.2023.104636] [Citation(s) in RCA: 20] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 07/11/2023] [Accepted: 07/25/2023] [Indexed: 07/31/2023] Open
Abstract
OBJECTIVES This network meta-analysis (NMA) aimed to compare the complete-arch scanning accuracy of different intraoral scanners (IOSs) to that of reference standard tessellation language (STL) files. DATA Studies comparing the trueness and precision of IOS STL files with those of reference STL scans for different arch types (dentate, edentulous, completely edentulous with implants, and partially edentulous with implants) were included in this study. SOURCES An electronic search of five databases restricted to the English Language was conducted in October 2021. STUDY SELECTION A total of 3,815 studies were identified, of which 114 were eligible for inclusion. After study selection and data extraction, pair-wise comparison and NMA were performed to define the accuracy of scanning for four arch subgroups using four outcomes (trueness and precision expressed as mean absolute deviation and root mean square values). Cochrane guidelines and the QUADAS-2 tool were used to assess the risk of bias. GRADE was used for certainty assessment. RESULTS Fifty-three articles were included in this NMA. Altogether, 26 IOSs were compared directly and indirectly in 10 network systems. The accuracy of IOSs scans were not significantly different from the reference scans for dentate arches (three IOSs), edentulous arches (three IOSs), and completely edentulous arches with implants (one IOS). The accuracy of the IOSs was significantly different from the reference scans for partially edentulous arches with implants. Significant accuracy differences were found between the IOSs, regardless of clinical scenarios. CONCLUSIONS The accuracy of complete-arch scanning by IOSs differs based on clinical scenarios. CLINICAL SIGNIFICANCE Different IOSs should be used according to the complete arch type.
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Affiliation(s)
- Viktória Vitai
- Centre for Translational Medicine, Semmelweis University, Budapest, Hungary; Department of Prosthodontics, Semmelweis University, Budapest, Hungary
| | - Anna Németh
- Centre for Translational Medicine, Semmelweis University, Budapest, Hungary; Department of Prosthodontics, Semmelweis University, Budapest, Hungary
| | - Eleonóra Sólyom
- Centre for Translational Medicine, Semmelweis University, Budapest, Hungary; Department of Periodontology, Semmelweis University, Budapest, Hungary
| | - László Márk 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
| | - Réka Fazekas
- Centre for Translational Medicine, Semmelweis University, Budapest, Hungary; Department of Restorative Dentistry and Endodontics, Semmelweis University, Budapest, Hungary
| | - Gábor Gerber
- Centre for Translational Medicine, Semmelweis University, Budapest, Hungary; Section of Oral Morphology, Department of Anatomy Histology and Embryology, 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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12
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Deferm JT, Baan F, Nijsink J, Verhamme L, Maal T, Meijer G. Intraoral scanning of the edentulous jaw without additional markers: An in vivo validation study on scanning precision and registration of an intraoral scan with a cone-beam computed tomography scan. Imaging Sci Dent 2023; 53:21-26. [PMID: 37006789 PMCID: PMC10060752 DOI: 10.5624/isd.20220131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 12/30/2022] [Accepted: 01/03/2023] [Indexed: 02/05/2023] Open
Abstract
Purpose A fully digital approach to oral prosthodontic rehabilitation requires the possibility of combining (i.e., registering) digital documentation from different sources. This becomes more complex in an edentulous jaw, as fixed dental markers to perform reliable registration are lacking. This validation study aimed to evaluate the reproducibility of 1) intraoral scanning and 2) soft tissue-based registration of an intraoral scan with a cone-beam computed tomography (CBCT) scan for a fully edentulous upper jaw. Materials and Methods Two observers independently performed intraoral scans of the upper jaw in 14 fully edentulous patients. The palatal vault of both surface models was aligned, and the inter-observer variability was assessed by calculating the mean inter-surface distance at the level of the alveolar crest. Additionally, a CBCT scan of all patients was obtained and a soft tissue surface model was generated using patient-specific gray values. This CBCT soft tissue model was registered with the intraoral scans of both observers, and the intraclass correlation coefficient (ICC) was calculated to evaluate the reproducibility of the registration method. Results The mean inter-observer deviation when performing an intraoral scan of the fully edentulous upper jaw was 0.10 ± 0.09 mm. The inter-observer agreement for the soft tissue-based registration method was excellent (ICC=0.94; 95% confidence interval, 0.81-0.98). Conclusion Even when teeth are lacking, intraoral scanning of the jaw and soft tissue-based registration of an intraoral scan with a CBCT scan can be performed with a high degree of precision.
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Affiliation(s)
- Julie Tilly Deferm
- Department of Oral and Maxillofacial Surgery, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
| | - Frank Baan
- 3D Laboratory, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
| | - Johan Nijsink
- 3D Laboratory, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
- Department of Radiology and Nuclear Medicine, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
| | - Luc Verhamme
- 3D Laboratory, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
| | - Thomas Maal
- 3D Laboratory, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
| | - Gert Meijer
- Department of Oral and Maxillofacial Surgery, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
- Department of Implantology and Periodontology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
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13
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Accuracy of intraoral scanning methods for maxillary Kennedy class I arch. J Dent Sci 2022; 18:747-753. [PMID: 37021235 PMCID: PMC10068486 DOI: 10.1016/j.jds.2022.12.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Revised: 12/05/2022] [Indexed: 12/23/2022] Open
Abstract
Background/purpose The optimal strategy for scanning removable partial dentures remains unknown. This study investigated scanning strategies for patients with a maxillary Kennedy Class I arch as well as the measurement deviations of three scanning strategies. Materials and methods A standard maxilla model was positioned with a holder in a dental chair to simulate a natural patient position and posture. Standard Tessellation Language files for reference models were formatted with a desktop scanner, and model operation files were obtained with a TRIOS 3 Pod intraoral scanner and superimposed using Exocad computer-aided design software. The three scanning strategies evaluated in this study (Strategy M, T-R, and R-T) were used for nine scans each, and the resulting data were recorded. The deviation of the three strategies was statistically analyzed through one-way ANOVA and Tukey post hoc testing. Results The trueness of Strategy M, T-R, and R-T was 52.6 ± 31.0, 54.9 ± 27.6, and 50.1 ± 22.3 μm, respectively. No statistically significant differences in trueness were detected among the three groups (P > 0.05). However, Strategy T-R had the evenest distribution of all measuring points. The deviations of the measurements obtained by three scanning strategies were mostly between 30 and 70 μm. The precision of the three strategies was similar as well. Conclusion Trueness did not differ significantly among the three strategies. However, Strategy T-R is recommended for use with a TRIOS 3 Pod scanner because of its reduction of the seesaw effect and high stabilization of the RPD framework.
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Elter B, Diker B, Tak Ö. The trueness of an intraoral scanner in scanning different post space depths. J Dent 2022; 127:104352. [PMID: 36334784 DOI: 10.1016/j.jdent.2022.104352] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Revised: 10/10/2022] [Accepted: 10/27/2022] [Indexed: 11/06/2022] Open
Abstract
OBJECTIVES The purpose of this in vitro study was to evaluate the trueness of scanning the post space up to 20 mm with an intraoral scanner (IOS). METHODS We captured 20-, 18-, 16-, 14-, 12-, and 10-mm length post space scans using an IOS (Primescan) eight times each by shortening the apical 2 mm end of the same mandibular canine tooth. The reference impressions of each length group were taken using a light-body polyvinyl siloxane impression material and were scanned with an extraoral scanner. The recorded standard tessellation language (STL) data of all impressions were uploaded to a 3D matching program for the trueness evaluation via the root mean square (RMS) calculation. For the statistical analysis, the Kruskal-Wallis and post-hoc Mann-Whitney U nonparametric tests were performed to compare the differences among the groups (α=0.05). RESULTS The median RMS values increased in direct proportion to the length of the post space from 10 mm (357.1 µm) to 20 mm (897.5 µm). We noted a significant difference among groups (p< 0.001). In the pairwise comparisons, there were no significant differences between the 14 mm and 16 mm groups (p=0.431) or between the 18 mm and 20 mm groups (p=0.036), while other paired groups showed significant differences (p=0.001). CONCLUSIONS The scanned space depth affected the trueness of the IOS (Primescan). If the post depth was below 14 mm, and the minimum diameter was 2.2 mm, Primescan could be used for impressions of the post-core structure, simplifying the impression procedure. CLINICAL SIGNIFICANCE IOS seems to be a promising technology for taking digital impressions of post spaces, but cannot be recommended as a routine procedure at its present stage, as final results are highly dependent on the clinical situation. Further studies with different IOS systems are needed to gain sound evidence.
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Affiliation(s)
- Bahar Elter
- Baskent University Istanbul Hospital, Uskudar, Istanbul, Turkey.
| | - Burcu Diker
- Faculty of Dentistry, Bezmialem Vakıf University, Topkapı, Istanbul, Turkey
| | - Önjen Tak
- Faculty of Dentistry, Department of Prosthodontics, Istinye University, Topkapı, Istanbul, Turkey
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15
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Shimizu T, Tasaka A, Wadachi J, Yamashita S. A new proposal for improving the accuracy of intraoral scanning for partially edentulous residual ridge. J Prosthodont Res 2022; 67:246-254. [PMID: 36031353 DOI: 10.2186/jpr.jpr_d_22_00088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
PURPOSE This study investigated the usefulness of a newly proposed intraoral scanning method, using markers that can be used directly in the oral cavity, in order to improve the accuracy of impression taking of the residual ridge for fabrication of removable partial dentures. METHODS An intraoral scanner was used to scan a dental model of a partially edentulous mandibular arch (Kennedy Class I). As markers, pieces of dried pasta were used. The scanning operation was performed under three conditions. In Condition 1, scanning was performed on the remaining teeth and the residual ridge without markers. In Condition 2, scanning of the remaining teeth and residual ridge was performed with markers. In Condition 3, the markers were removed from the model used in Condition 2, and the residual ridge was scanned again. The scanning data of each condition was superimposed on the control data, and the shape error was calculated and compared among the conditions. RESULTS There was a significant difference in trueness of the residual ridge before and after marker application. The application of markers improved the trueness, while maintaining precision. Re-scanning after removing the marker did not affect trueness between before and after re-scanning and the re-scanned region showed shape continuity with the surrounding region. CONCLUSION The present method using markers that can be used in the oral cavity was effective in improving the accuracy of impression taking at the residual ridge.
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Affiliation(s)
- Takahiro Shimizu
- Department of Removable Partial Prosthodontics, Tokyo Dental College, Tokyo, Japan
| | - Akinori Tasaka
- Department of Removable Partial Prosthodontics, Tokyo Dental College, Tokyo, Japan
| | - Juro Wadachi
- Department of Removable Partial Prosthodontics, Tokyo Dental College, Tokyo, Japan
| | - Shuichiro Yamashita
- Department of Removable Partial Prosthodontics, Tokyo Dental College, Tokyo, Japan
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16
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Majeed-Saidan A, Dutra V, Levon JA, Chu TMG, Morton D, Alfaraj A, Lin WS. The Trueness of Scans using One Intraoral Scanner in Different Partially Edentulous Conditions. J Prosthodont 2022. [PMID: 35977883 DOI: 10.1111/jopr.13592] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Accepted: 08/07/2022] [Indexed: 11/28/2022] Open
Abstract
PURPOSE To investigate the trueness of intraoral scanning in 8 commonly seen partially edentulous conditions. MATERIALS AND METHODS A maxillary dentoform was modified into the 8 commonly seen partially edentulous conditions. Each modification was scanned with a laboratory desktop scanner. Each modification was then scanned 10 times (n = 10) with an intraoral scanner. All scans were exported as STL files and then imported into a surface matching software using the best-fit alignment method. The dimensional differences between the study STL files from the intraoral scanner were compared to the corresponding reference STL files. The measurements were calculated as the root mean square (RMS) and defined as the trueness of the intraoral scans. In addition to the RMS values, qualitative assessments were completed on the color maps. The color maps produced by the surface matching software were used to visualize the areas of deviation between scans from the intraoral scanner and their corresponding reference files. One-way analysis of variance (ANOVA), followed by pair-wise comparisons using Fisher's Protected Least Significant Difference were utilized to compare the differences between the groups in RMS values (α = 0.05). RESULTS Partially edentulous condition significantly affected the trueness of the intraoral scans. Group 8 (Class IV) had significantly lower RMS (0.1878 ±0.0455 mm) than all other groups (P < 0.001). Group 2 (Class II) and Group 7 (Class III modification I) are not significantly different from each other (Group 2: 0.5758 ±0.0300 mm; Group 7: 0.5602 ±0.0231 mm, P = 0.571), while they both had significantly higher RMS than all other groups (P < .001). The remaining groups showed the RMS values were within the range of 0.3001 ±0.0891 mm (Group 6 - Class III with Long Edentulous Span) and 0.4541 ±0.1039 mm (Group 1 - Class I). CONCLUSION Different partially edentulous conditions affected the trueness of the scans generated from the selected intraoral scanner. Class IV edentulous condition had the highest intraoral scan trueness. It is unknown if RMS values are clinically significant, and the validity of using intraoral scans directly for PRDP fabrication will need further studies. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Ahmad Majeed-Saidan
- Clinical Instructor, Division of Prosthodontics, Department of Advanced Oral Therapeutics and Sciences, University of Maryland School of Dentistry
| | - Vinicius Dutra
- Clinical Associate Professor, Department Oral Pathology, Radiology, and Oral Medicine, Indiana University School of Dentistry
| | - John A Levon
- Clinical Assistant Professor, Department of Prosthodontics, Indiana University School of Dentistry
| | - Tien-Min G Chu
- Professor, Associate Dean for Research, Department of Biomedical Sciences and Comprehensive Care, Indiana University School of Dentistry
| | - Dean Morton
- Professor, Department of Prosthodontics, Indiana University School of Dentistry
| | - Amal Alfaraj
- Implant Fellow, Department of Prosthodontics, Indiana University School of Dentistry
| | - Wei-Shao Lin
- Professor, Program Director, and Chair, Advanced Education Program in Prosthodontics, Department of Prosthodontics, Indiana University School of Dentistry
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AlRumaih HS. Clinical Applications of Intraoral Scanning in Removable Prosthodontics: A Literature Review. J Prosthodont 2021; 30:747-762. [PMID: 34043266 DOI: 10.1111/jopr.13395] [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] [Accepted: 05/23/2021] [Indexed: 11/27/2022] Open
Abstract
PURPOSE This review aimed to identify the reported intraoral scanning applications in fabricating different types of removable prostheses in the field of prosthodontics. METHODS A comprehensive electronic search was performed using the PubMed and MEDLINE databases. This review included in vitro studies and clinical reports published between January 2013 and March 2021. The main keywords were as follows: intraoral scanning, digital impression, computerized digital impression, removable prosthesis, chairside computer-aided design/computer-assisted manufacturing, digital complete denture, digital immediate complete denture, digital interim complete denture, digital removable partial denture, digital removable overdenture, digital obturator, digital occlusal splints, and digital maxillofacial prostheses. RESULTS In total, 33 papers (22 clinical reports, 8 papers focused on dental techniques, and 3 clinical studies) were included in the final analysis. CONCLUSIONS The efficiency of using intraoral scanning in the field of removable prosthodontics was documented. However, there is a need for more clinical studies to identify intraoral scanning-usage protocols and to yield reliable and valid data.
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Affiliation(s)
- Hamad S AlRumaih
- Substitutive Dental Science Department, College of Dentistry, Imam Abdulrahman Bin Fasial University, Dammam, Saudi Arabia
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18
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Deferm JT, Nijsink J, Baan F, Verhamme L, Meijer G, Maal T. Soft tissue-based registration of intraoral scan with cone beam computed tomography scan. Int J Oral Maxillofac Surg 2021; 51:263-268. [PMID: 33933335 DOI: 10.1016/j.ijom.2021.04.004] [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: 11/21/2020] [Revised: 01/28/2021] [Accepted: 04/06/2021] [Indexed: 10/21/2022]
Abstract
The aim of this study was to evaluate a novel soft tissue-based method to register an intraoral scan (IOS) with a cone beam computed tomography (CBCT) scan. IOS and CBCT data were obtained from eight dentate patients (mean age 21±2 years; three male, five female) and 14 fully edentulous patients (mean age 56±9 years; eight male, six female). An algorithm was developed to create a soft tissue model of the CBCT scan, which allowed a soft tissue-based registration to be performed with the IOS. First, validation was performed on dentate jaws with registration of the palatal mucosal surface and accuracy evaluation at the level of the teeth. Second, fully edentulous jaws were registered using both the palatal and alveolar crest mucosal surfaces. Distance maps were created to measure the method accuracy. The mean registration error was 0.49±0.26mm for the dentate jaws. Registration of the fully edentulous jaws had a mean error of 0.16±0.08mm at the palate and 0.16±0.05mm at the alveolar crest. In conclusion, the high accuracy of this registration method may allow the digital workflow to be optimized when no teeth are available to perform a regular registration procedure.
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Affiliation(s)
- J T Deferm
- Department of Oral and Maxillofacial Surgery, Radboud University Nijmegen Medical Centre, Nijmegen, the Netherlands.
| | - J Nijsink
- 3D Laboratory, Department of Radiology ad Nuclear Medicine, Radboud University Nijmegen Medical Centre, Nijmegen, the Netherlands
| | - F Baan
- 3D Laboratory, Department of Oral and Maxillofacial Surgery, Radboud University Nijmegen Medical Centre, Nijmegen, the Netherlands
| | - L Verhamme
- 3D Laboratory, Department of Oral and Maxillofacial Surgery, Radboud University Nijmegen Medical Centre, Nijmegen, the Netherlands
| | - G Meijer
- Department of Oral and Maxillofacial Surgery, Radboud University Nijmegen Medical Centre, Nijmegen, the Netherlands; Department of Implantology and Periodontology, Radboud University Nijmegen Medical Centre, Nijmegen, the Netherlands
| | - T Maal
- 3D Laboratory, Department of Oral and Maxillofacial Surgery, Radboud University Nijmegen Medical Centre, Nijmegen, the Netherlands
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Rasaie V, Abduo J, Hashemi S. Accuracy of Intraoral Scanners for Recording the Denture Bearing Areas: A Systematic Review. J Prosthodont 2021; 30:520-539. [PMID: 33554361 DOI: 10.1111/jopr.13345] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
PURPOSE To systematically review clinical and laboratory studies that investigated the accuracy of intraoral scanners in recording denture bearing areas. MATERIALS AND METHODS Electronic and manual searches were conducted to identify all the available clinical and laboratory studies reporting the accuracy of digital impressions for recording denture related soft tissues. After the application of predetermined inclusion and exclusion criteria, the final list of articles was reviewed to meet the objective of this study. RESULTS The inclusion criteria were met by 18 studies out of which 8 were clinical and the rest were laboratory investigations. The eligible studies assessed the accuracy of intraoral scanners in recording both the denture supporting structures and the peripheral mobile tissues. The accuracy results were different among the various intraoral scanners. Likewise, the effect of several influencing factors, such as artificial markers, scanner head size, scanning strategy, and the operator's experience, were evaluated. CONCLUSION While the accuracy of intraoral scanners was comparable to the conventional techniques in recording bony structures with attached mucosa, they were not capable of accurately registering the mobile tissues. In addition, factors such as presence of a marker, larger scanner head size and specific scanning techniques appeared to improve the accuracy of the digital impression.
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Affiliation(s)
- Vanya Rasaie
- Department of Prosthodontics, Dental School, Ilam University of Medical Sciences, Ilam, Iran
| | - Jaafar Abduo
- Department of Prosthodontics, Melbourne Dental School, Melbourne University, Melbourne, Australia
| | - Saloumeh Hashemi
- Department of Prosthodontics, Melbourne Dental School, Melbourne University, Melbourne, Australia
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Fueki K, Inamochi Y, Wada J, Arai Y, Takaichi A, Murakami N, Ueno T, Wakabayashi N. A systematic review of digital removable partial dentures. Part I: Clinical evidence, digital impression, and maxillomandibular relationship record. J Prosthodont Res 2021; 66:40-52. [PMID: 33504721 DOI: 10.2186/jpr.jpr_d_20_00116] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
PURPOSE This study comprehensively reviewed the current status of digital workflows in fabricating removable partial dentures (RPDs) using evidence from clinical trials and case reports. STUDY SELECTION We performed a systematic review of the literature on the materials and fabrication of RPDs using digital technologies published in online databases from 1980 to 2020. We selected eligible articles from the search results, retrieved information on digital RPDs from these, and conducted a qualitative analysis. We report evidence from clinical papers and case reports, digital impression-taking methods, and maxillomandibular relationship (MMR) records. RESULTS A case report electronically published in 2019 introduced a clasp-retained RPD fabricated via a full-digital workflow without a gypsum definitive cast. Computer-aided design and computer-aided manufacturing of double-crown-retained RPDs with nonmetal materials were described in some case reports. Intraoral scanners were used to obtain digital impressions and MMR records in the fabrication of digital RPDs, which have potential advantages for reducing the number of clinical appointments and simplifying laboratory procedures. Evidence from clinical trials is scarce; a randomized controlled trial reported higher patient satisfaction with digital clasp-retained RPDs than with conventional RPDs. CONCLUSIONS Full-digital RPDs can be fabricated without a gypsum definitive cast. However, the indication for full-digital RPDs is limited to cases with Kennedy Class III/IV partially edentulous arches with several missing teeth. Challenges in digital impression-taking and MMR recording remain to be solved to extend these indications. More evidence from clinical trials is required to evaluate the efficacy and usefulness of digital R PDs.
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Affiliation(s)
- Kenji Fueki
- Department of Removable Partial Prosthodontics, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo
| | - Yuka Inamochi
- Department of Removable Partial Prosthodontics, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo
| | - Junichiro Wada
- Department of Removable Partial Prosthodontics, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo
| | - Yuki Arai
- Department of Removable Partial Prosthodontics, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo
| | - Atsushi Takaichi
- Department of Removable Partial Prosthodontics, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo
| | - Natsuko Murakami
- Department of Removable Partial Prosthodontics, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo
| | - Takeshi Ueno
- Department of Removable Partial Prosthodontics, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo
| | - Noriyuki Wakabayashi
- Department of Removable Partial Prosthodontics, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo
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