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Lin YC, Tarrazzi D, Schoenbaum T, Knoernschild K. Effect of postprocessing parameters on the flexural strength of vat-polymerized additively manufactured interim fixed dental prostheses: A systematic review with postprocessing guidelines. J Prosthet Dent 2024:S0022-3913(24)00497-9. [PMID: 39142995 DOI: 10.1016/j.prosdent.2024.07.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2024] [Revised: 07/16/2024] [Accepted: 07/17/2024] [Indexed: 08/16/2024]
Abstract
STATEMENT OF PROBLEM Limited data exist regarding the effects of postprocessing on the flexural strength of vat-polymerized additively manufactured (AM) interim fixed dental prostheses. PURPOSE The purpose of this systematic review was to determine how the postprocessing workflow affects the mechanical properties of vat-polymerized additively manufactured interim fixed dental prostheses and to establish clinical guidelines. MATERIAL AND METHODS The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines were followed. The population, intervention, comparison, and outcome (PICO) question was "For vat-polymerized additively manufactured interim fixed dental prostheses (P), does varying the postprocessing workflow/ protocol (I and C) affect mechanical properties/physical properties/flexural strength (O)?" Searches were conducted in 3 databases: PubMed/Medline, EMBASE, and Web of Science, with 2 investigators performing the title and abstract screening and setting the inclusion and exclusion criteria to identify publications. The risk of bias was evaluated by applying the Joanna Briggs Institute Critical Appraisal Checklist for Quasi-Experimental Studies (nonrandomized experimental studies). The reported independent variables of rinse solution, rinse time, and polymerization time on the flexural strength results were extracted for qualitative review. RESULTS The initial search identified 149 records, with 12 in vitro studies meeting the inclusion criteria. Significant heterogeneity was observed in the manufacturing process and materials. Eleven of 12 included studies reported flexural strength above 100 MPa when following the manufacturer's recommendation. Postprocessing rinsing ranged from 5 seconds to 90 minutes, with potentially reduced flexural strength with extended rinsing. A rinse of 5 to 10 minutes was recommended for optimal mechanical properties, degree of conversion, and biocompatibility. Isopropyl alcohol (IPA) and tripropylene glycol monomethyl ether (TPM) were the most investigated rising solutions, while experimental solutions including 99.5% acetone and 100% bio-ethyl alcohol reportedly decreased flexural strength. Polymerization time and intensity correlated positively with the flexural strength, whereas an artificial aging process reduced the flexural strength. CONCLUSIONS Heterogeneity existed in the reported postprocessing protocols for AM interim fixed prostheses, including manufacturer materials, methods, and study outcomes. While polymerization time and intensity correlated with greater strength, consistent patterns regarding rinsing solution or time were lacking. Rinsing solution, extended rinsing time, and artificial aging may reduce flexural strength. Further investigation is indicated.
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Affiliation(s)
- Yu Chun Lin
- Assistant Professor, Department of Restorative Sciences, Dental College of Georgia at Augusta University, Augusta, GA.
| | - Daler Tarrazzi
- Assistant Professor, Department of Restorative Sciences, Dental College of Georgia at Augusta University, Augusta, GA
| | - Todd Schoenbaum
- Professor, Department of Restorative Sciences, Dental College of Georgia at Augusta University, Augusta, GA
| | - Kent Knoernschild
- Chair and Professor, Department of Preventive and Restorative Dental Sciences, University of California, San Francisco, San Francisco, Calif
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Popa AD, Vlăduțu DE, Turcu AA, Târtea DA, Ionescu M, Păunescu C, Stan RS, Mercuț V. Aspects of Occlusal Recordings Performed with the T-Scan System and with the Medit Intraoral Scanner. Diagnostics (Basel) 2024; 14:1457. [PMID: 39001349 PMCID: PMC11241177 DOI: 10.3390/diagnostics14131457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2024] [Accepted: 07/03/2024] [Indexed: 07/16/2024] Open
Abstract
INTRODUCTION Dental occlusion refers to the static and dynamic relationships that are established between the teeth of the two arches and is an important factor in the homeostasis of the dento-maxillary system. The objective of the present study was to compare two digital occlusal analysis systems: the T-Scan III system and the Medit I600 intraoral scanner. MATERIALS AND METHODS The study was carried out on 20 students from the Faculty of Dental Medicine Craiova, whose dental occlusion was assessed with the T-Scan III system and with the Medit I600 intraoral scanner. Dental occlusion was assessed in the maximum intercuspation position, the edge-to-edge protrusion position, and the edge-to-edge position in right and left laterotrusion. The images of the 2D occlusal contact areas obtained by both methods were converted to .jpeg format and then transferred to Adobe Photoshop CS6 2021 (Adobe Systems, San Jose, CA, USA) for comparison. The recorded data were statistically processed. RESULTS Analyzing the data provided by the two digital occlusal analysis systems, it was found that the T-Scan III system provided data related to the amplitude of the occlusal forces, the surface on which they were distributed (the contact surface), the dynamics of the occlusal contacts, and the proportion in which they were distributed at the level of the two hemiarches, and the Medit I600 intraoral scanner performed an evaluation of the occlusal interface of the two arches, highlighting the extent of the contact areas with the degree of overlapping of the occlusal components. Although both methods of occlusal analysis recorded the highest values for the maximum intercuspation position, the results could not be compared. CONCLUSIONS The two digital systems provide different data in occlusal analysis. As the T-Scan III system is considered the gold standard for occlusal analysis, more studies are needed to understand the data provided by the Medit I600 intraoral scanner and their significance.
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Affiliation(s)
- Angelica Diana Popa
- Department of Prosthetic Dentistry, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Diana Elena Vlăduțu
- Department of Prosthetic Dentistry, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Adina Andreea Turcu
- Department of Oro-Dental Prevention, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Daniel Adrian Târtea
- Department of Oral Rehabilitation, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Mihaela Ionescu
- Department of Medical Informatics and Biostatistics, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Cătălin Păunescu
- Department of IT, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Răzvan Sabin Stan
- Department of IT, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Veronica Mercuț
- Department of Prosthetic Dentistry, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
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Goldstein GR. Centric relation: A needed reference position. J Prosthodont 2022. [PMID: 36074517 DOI: 10.1111/jopr.13603] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Accepted: 08/31/2022] [Indexed: 11/26/2022] Open
Abstract
PURPOSE Centric Relation (CR) is a universally recognized term and an acceptable reference position with a long history of success. The problem is that there is little consensus as to its definition or the method of recording it, and this has created an uprising to abolish it. METHODS A review of pertinent literature related to its definition, method of recording, anatomic considerations and long-standing principles was conducted. RESULTS CR is an established term but there are valid concerns over its definition and method of recording. There is consensus on using it as a restorative position in a patient in need of full arch reconstruction and there is no substantive clinical research to contradict this. If a clinician decides to use a different position, it should have a different name. CONCLUSIONS CR is a reproducible reference position that can be utilized for diagnostic and restorative dental procedures with substantial scientific evidence to support that premise. There are numerous well documented techniques, all of which are intermaxillary, that can replicate the position. There is little scientific evidence to support a premise as to where the exact position of the condyle should be in relation to the fossa. This article is protected by copyright. All rights reserved.
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Nalamliang N, Sumonsiri P, Thongudomporn U. Masticatory performance is influenced by masticatory muscle activity balance and the cumulative occlusal contact area. Arch Oral Biol 2021; 126:105113. [PMID: 33826961 DOI: 10.1016/j.archoralbio.2021.105113] [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: 02/07/2021] [Revised: 03/16/2021] [Accepted: 03/25/2021] [Indexed: 10/21/2022]
Abstract
OBJECTIVE To investigate the influence of masticatory muscle activity balance, occlusal contact area balance and the area of occlusal contact on masticatory performance in healthy dentate adults. DESIGN This cross-sectional study included ninety-three healthy subjects with complete dentition. Surface electromyography (sEMG) was used to record bilateral anterior temporalis activity and masseter muscle activity during maximum voluntary clenching and while chewing a test food. Seven levels of area of occlusal contact and near contact (ACNC) were registered and calculated cumulatively. The percentage overlapping coefficients were calculated for both muscle groups at maximum voluntary clenching and chewing and all levels of ACNC. Masticatory performance was measured by determining the median particle size of frankfurter sausage after 15 chewing cycles. Pearson's correlation and stepwise multiple linear regression analyses were used to assess the correlations between variables and the influence of the variables on masticatory performance, respectively, at the 0.05 level of significance. RESULTS Muscle balance during clenching and chewing, all near contact levels of cumulative ACNC and ACNC balance correlated negatively with median particle size (P < 0.05). The model based on stepwise multiple linear regression analysis showed muscle balance during clenching and cumulative ACNC at < 250 μm influenced median particle size. CONCLUSION Masticatory muscle activity balance during maximum voluntary clenching and the cumulative amount of near contact area were associated with masticatory performance, suggesting the amount of occlusal contact area-as well the balance of masticatory muscle activity-play a role in masticatory performance.
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Affiliation(s)
- Napat Nalamliang
- Orthodontic Section, Department of Preventive Dentistry, Faculty of Dentistry, Prince of Songkla University, Hat Yai, Songkhla, Thailand
| | | | - Udom Thongudomporn
- Orthodontic Section, Department of Preventive Dentistry, Faculty of Dentistry, Prince of Songkla University, Hat Yai, Songkhla, Thailand.
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Nalamliang N, Sumonsiri P, Thongudomporn U. Are occlusal contact area asymmetry and masticatory muscle activity asymmetry related in adults with normal dentition? Cranio 2020; 40:409-417. [DOI: 10.1080/08869634.2020.1764270] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Napat Nalamliang
- Orthodontic Section, Department of Preventive Dentistry, Faculty of Dentistry, Prince of Songkla University, Songkhla, Thailand
| | - Pattra Sumonsiri
- Private Orthodontic Practice, Smile On Orthodontics & Dental Clinic, Chiang Mai, Thailand
| | - Udom Thongudomporn
- Orthodontic Section, Department of Preventive Dentistry, Faculty of Dentistry, Prince of Songkla University, Songkhla, Thailand
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Ahmed WM, Hans A, Verhaeghe TV, Nguyen C. Managing Excessive Gingival Display Using a Digital Workflow. J Prosthodont 2020; 29:443-447. [PMID: 32321195 DOI: 10.1111/jopr.13181] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 04/16/2020] [Accepted: 04/17/2020] [Indexed: 11/28/2022] Open
Abstract
This technique article describes an approach to managing excessive gingival display by lengthening of the clinical crowns using a digital workflow. An intraoral scanner was used to obtain a template to be used for the crown lengthening surgical procedure considering the patient-desired diagnostic setups while fully seating the template on the patient's teeth during surgery. Using a digital approach for lengthening the clinical crowns decreased the likelihood of the need for postsurgical modifications, thus shortening the treatment duration. After the crown lengthening healed for 12 weeks, full-mouth reconstruction proceeded. Maxillary and mandibular preparation reduction guides were digitally designed and printed to facilitate conservative crown preparations. An intraoral scanner was used to make full-arch scans and interocclusal records for the fabrication of provisional and final crowns. Fully guided implant planning and placement were also executed.
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Affiliation(s)
- Walaa Magdy Ahmed
- Faculty of Dentistry, The University of British Columbia, Vancouver, BC, Canada.,Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Amandeep Hans
- Faculty of Dentistry, The University of British Columbia, Vancouver, BC, Canada
| | - Tyler V Verhaeghe
- Faculty of Dentistry, The University of British Columbia, Vancouver, BC, Canada
| | - Caroline Nguyen
- Faculty of Dentistry, The University of British Columbia, Vancouver, BC, Canada
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Haralur SB, Alqahtani AS, AlMazni MS, Alqahtani MK. Association of Non-Carious Cervical Lesions with Oral Hygiene Habits and Dynamic Occlusal Parameters. Diagnostics (Basel) 2019; 9:diagnostics9020043. [PMID: 31013807 PMCID: PMC6627150 DOI: 10.3390/diagnostics9020043] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2019] [Revised: 04/09/2019] [Accepted: 04/10/2019] [Indexed: 11/16/2022] Open
Abstract
Dentists routinely encounter non-carious cervical lesions (NCCLs) in daily clinical practices. The dental literature is contradictory regarding the occlusal etiology of NCCLs. NCCL is defined as the loss of dental structure at the cemento-enamel junction, with no association of bacteria. The aim of this study was to evaluate the association of dynamic occlusal factors and dental hygiene practices with NCCLs. In total, 100 participants were selected by the random stratified sampling method, 50 each for control and NCCL groups. Information regarding oral hygiene practices, including frequency, duration, force, and technique of brushing, was recorded. Dynamic occlusal parameters like initial contact, occlusion time (OT), disocclusion time (DT), and center of force were recorded with T-scan analysis. The obtained data were analyzed with Pearson's correlation and binary logistic regression. We found that 68% of participants in the NCCL group and 31% in the control group utilized the horizontal brushing technique; 46% of NCCL group participants used hard brush against 7% of participants in the control group. The mean OT was 0.727 and 0.516 s for NCCL and control groups, respectively. The OT and left and right lateral DT were strongly related to NCCL, with r-values of 0.661, 0.642, and 0.534, respectively, with p ≤ 0.001. Using a hard toothbrush was found to be associated with NCCL. The NCCL group had extended mean occlusion time and disocclusion time in all eccentric mandibular movements.
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Affiliation(s)
- Satheesh B Haralur
- Department of Prosthodontics, College of Dentistry, King Khalid University, 62529 Abha, Saudi Arabia.
| | | | - Mohammed Shaya AlMazni
- Department of Prosthodontics, College of Dentistry, King Khalid University, 62529 Abha, Saudi Arabia.
| | - Mohammad Khalid Alqahtani
- Department of Prosthodontics, College of Dentistry, King Khalid University, 62529 Abha, Saudi Arabia.
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Racich MJ. Occlusion, temporomandibular disorders, and orofacial pain: An evidence-based overview and update with recommendations. J Prosthet Dent 2018; 120:678-685. [DOI: 10.1016/j.prosdent.2018.01.033] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Revised: 01/25/2018] [Accepted: 01/25/2018] [Indexed: 12/13/2022]
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Temporomandibular Disorders: "Occlusion" Matters! Pain Res Manag 2018; 2018:8746858. [PMID: 29861806 PMCID: PMC5976904 DOI: 10.1155/2018/8746858] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Revised: 03/17/2018] [Accepted: 04/11/2018] [Indexed: 01/30/2023]
Abstract
By analogy with the journal's title Pain Research and Management, this review describes TMD Research and Management. More specific are the (1) research aspects of “occlusion,” still one of the most controversial topics in TMD, and (2) as much as possible evidence-based management aspects of “TMD” for the dental practitioner. Research. The disorders temporomandibular dysfunction and the synonymous craniomandibular dysfunction are still being discussed intensely in the literature. Traditionally, attention is mostly devoted to occlusion and its relationship with these disorders. The conclusions reached are often contradictory. Considering the definitions of temporomandibular and craniomandibular dysfunctions/disorders and “occlusion,” a possible explanation for this controversy can be found in the subsequent methodological problems of the studies. Based on a Medline search of these terms over the past 40 years related to contemporary terms such as “Evidence Based Dentistry” and “Pyramid of Evidence,” these methodological aspects are examined, resulting in recommendations for future research and TMD-occlusal therapy. Management. To assist the dental practitioner in his/her daily routine to meet the modern standards of best practice, 7 guidelines are formulated that are explained and accompanied with clinical examples for an evidence-based treatment of patients with this disorder in general dental practices.
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Skármeta NP. Occlusal stability and mandibular stability: The major part of dentistry we are still neglecting. Cranio 2017; 35:201-203. [PMID: 28531366 DOI: 10.1080/08869634.2017.1329686] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Nicolás Patricio Skármeta
- a Orofacial Pain at Hospital del Salvador , SSMO , Santiago Chile.,b Orofacial Pain at OPH Dental , Santiago , Chile.,c Orofacial Pain at EOC Odontología , Santiago , Chile.,d Clinical Coordinator of Continuing Dental Education Program in Clinical Occlusion and TMD diagnostics, Clínica Alemana Santiago- , Universidad del Desarrollo , Chile
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Goldstein G, Andrawis M, Choi M, Wiens J, Janal MN. A survey to determine agreement regarding the definition of centric relation. J Prosthet Dent 2017; 117:426-429. [DOI: 10.1016/j.prosdent.2016.08.014] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Revised: 08/12/2016] [Accepted: 08/12/2016] [Indexed: 10/20/2022]
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Coelho MF, Cavalcanti BDN, Claro Neves AC, Jóias RP, Rode SDM. Influence of dental chair backrest inclination on the registration of the mandibular position. J Prosthet Dent 2015; 114:693-5. [PMID: 26344187 DOI: 10.1016/j.prosdent.2015.05.013] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2014] [Revised: 05/09/2015] [Accepted: 05/12/2015] [Indexed: 10/23/2022]
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