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Castro-Ramirez L, Espinoza-Salcedo M, Huamani-Echaccaya J, Ladera-Castañeda M, Cervantes-Ganoza L, Hernández-Huamaní E, Aroste-Andía R, Gavilán-Chávez P, Cayo-Rojas C. Effect of Polywave and Monowave Light Curing Units on the Microtensile Bond Strength and Failure Types of Different Bulk-Fill Resin Composites: An in vitro Study. Clin Cosmet Investig Dent 2024; 16:153-165. [PMID: 38808075 PMCID: PMC11131952 DOI: 10.2147/ccide.s465226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2024] [Accepted: 05/17/2024] [Indexed: 05/30/2024] Open
Abstract
Aim This study aimed to evaluate the effects of polywave and monowave light-emitting diode curing units on the microtensile bond strength and failure types of three bulk-fill resin composites. Materials and Methods This in vitro experimental study was performed on 180 microbars obtained from human third molars and were distributed into 12 groups according to the type of bulk-fill resin composite and the light-curing unit. Third molars were restored using Filtek One Bulk Fill Restorative, Tetric® N-Ceram Bulk Fill, and Opus Bulk Fill resin composites was light-cured with Elipar Deep Cure L and Valo in three modes: standard, high power, and extra power. Subsequently, microtensile analysis was carried out with a universal testing machine and the type of failure with an optical stereomicroscope. For statistical analysis, the Kruskal-Wallis H-test was used, with the Bonferroni post hoc test and Fisher's exact test, considering a significance of p<0.05. Results There were significant differences in the microtensile bond strength between the Filtek One Bulk Fill restorative and Opus Bulk-Fill (p = 0.042) when light was cured with the polywave unit at standard power. On the other hand, the Filtek One Bulk Fill Restorative and Opus Bulk Fill resins showed significant differences in microtensile bond strength when light was cured with the monowave unit compared with the polywave unit (p<0.05). Conclusion The presence of alternative photoinitiator systems that are more reactive than camphorquinone produced higher microtensile bond strength in Tetric N-Ceram Bulk Fill and Opus Bulk Fill resins when light-cured with a high and standard polywave unit, respectively, compared to Filtek One Bulk Fill resins. Finally, Tetric N-Ceram Bulk Fill and Opus Bulk Fill resins had the highest percentage of mixed failures, while Filtek One Bulk Fill resin had adhesive failures, which was related to its lower microtensile bond strength.
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Affiliation(s)
- Leonor Castro-Ramirez
- Postgraduate School, Universidad Privada Antenor Orrego, Trujillo, Peru
- School of Stomatology, Universidad Privada San Juan Bautista, Lima, Peru
| | | | | | - Marysela Ladera-Castañeda
- Faculty of Dentistry and Postgraduate School, Research Team “Salud Pública – Salud Integral”, Universidad Nacional Federico Villarreal, Lima, Peru
| | | | | | - Rosa Aroste-Andía
- School of Stomatology, Universidad Privada San Juan Bautista, Ica, Peru
| | | | - César Cayo-Rojas
- School of Stomatology, Universidad Privada San Juan Bautista, Lima, Peru
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Sedky RA, Chew HP, Nour KA, Abuelsadat SM, Elsherbini D, Fok ASL. Interfacial integrity of bulk-fill resin composite restorations in deep Class-II cavities. Dent Mater J 2023; 42:692-699. [PMID: 37612062 DOI: 10.4012/dmj.2022-241] [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: 08/25/2023]
Abstract
This study evaluated the interfacial integrity of deep (6 mm) Class-II (OM/OD) restorations placed using different bulk-fill resin composites [Filtek™ Bulk Fill Flowable Restorative (BF) and Filtek™ Bulk Fill Posterior Restorative (BP) (3M ESPE, St. Paul, MN, USA)] of different increment thicknesses (2 or 4 mm). BP was used for capping in all cases, while Filtek™ Z250 Universal Restorative (3M ESPE) was used as the control material. Interfacial debonding was measured during curing through acoustic emission (AE), followed by image analysis using micro-computed tomography and scanning electron microscopy. Microhardness testing was also conducted to assess degree of conversion. Depth of cure was adequate in all restorations. Specimens with 4-mm thick first increment of BF, which had a higher shrinkage strain, produced most AE events and debonding. Thus, bulk filling of deep cavities using bulk-fill resin composites with a high shrinkage strain should be avoided.
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Affiliation(s)
| | - Hooi Pin Chew
- Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota
| | - Khaled Aly Nour
- Department of Operative Dentistry, Faculty of Dentistry, Ain-Shams University
| | | | - Dina Elsherbini
- Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota
| | - Alex Siu Lun Fok
- Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota
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Elshazly TM, Nang D, Golkhani B, Elattar H, Keilig L, Bourauel C. Effect of thermomechanical aging of orthodontic aligners on force and torque generation: An in vitro study. J Mech Behav Biomed Mater 2023; 143:105911. [PMID: 37207526 DOI: 10.1016/j.jmbbm.2023.105911] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Revised: 05/10/2023] [Accepted: 05/14/2023] [Indexed: 05/21/2023]
Abstract
The aim of the study is to investigate the effects of artificial aging by thermocycling and mechanical loading on force/torque delivery by thermoplastic orthodontic aligners. Ten thermoformed aligners, made of Zendura™ thermoplastic polyurethane sheets, were aged over two weeks in deionized water by thermocycling alone (n = 5) and by both thermocycling and mechanical loading (n = 5). The force/torque generated on upper second premolar (Tooth 25) of a plastic model was measured before aging (as control), and after 2, 4, 6, 10, and 14 days of aging, using a biomechanical set-up. Before aging, the extrusion-intrusion forces were in the range of 2.4-3.0 N, the oro-vestibular forces were 1.8-2.0 N, and the torques on mesio-distal rotation were 13.6-40.0 Nmm. Pure thermocycling had no significant effect on the force decay of the aligners. However, there was a significant decrease in force/torque after 2 days of aging for both thermocycling and mechanical loading aging group, which is no longer significant over 14 days of aging. In conclusion, artificial aging of aligners in deionized water with both thermocycling and mechanical loading results in a significant decrease in force/torque generation. However, mechanical loading of aligners has a greater impact than pure thermocycling.
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Affiliation(s)
- Tarek M Elshazly
- Oral Technology Department, Dental School, University Hospital Bonn, Bonn, Germany.
| | - Diva Nang
- Oral Technology Department, Dental School, University Hospital Bonn, Bonn, Germany
| | - Bijan Golkhani
- Oral Technology Department, Dental School, University Hospital Bonn, Bonn, Germany
| | - Hanaa Elattar
- Orthodontic Department, Faculty of Dentistry, Umm Al-Qura University, Makkah, Saudi Arabia; Orthodontic Department, Faculty of Dentistry, Suez Canal University, Ismailia, Egypt
| | - Ludger Keilig
- Oral Technology Department, Dental School, University Hospital Bonn, Bonn, Germany; Department of Dental Prosthetics, Propaedeutics and Materials Science, Dental School, University Hospital Bonn, Bonn, Germany
| | - Christoph Bourauel
- Oral Technology Department, Dental School, University Hospital Bonn, Bonn, Germany
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The influence of different placement techniques on the clinical success of bulk-fill resin composites placed in Class II cavities: a 4-year randomized controlled clinical study. Clin Oral Investig 2023; 27:541-557. [PMID: 36222961 DOI: 10.1007/s00784-022-04749-7] [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: 04/09/2022] [Accepted: 10/02/2022] [Indexed: 02/03/2023]
Abstract
OBJECTIVE The purpose of this double-blind and split-mouth randomized controlled clinical trial was to evaluate the clinical success of the placement technique (bulk-filling and incremental techniques) of a bulk-fill resin composite in Class II carious lesions. MATERIALS AND METHODS Two different bulk-fill resin composites, X-tra fil (Voco) and Filtek Bulk Fill (3M ESPE), were used in the bulk-filling and incremental techniques for 20 patients. The study was carried out in 4 groups, with 20 restorations in each group. Restorations were appraised at baseline, 6-month, 2-year, and 4-year recall. World Dental Federation (FDI) and the US Public Health Service (USPHS) criteria were used in the evaluations. The Friedman, Kruskal-Wallis, and Mann-Whitney U tests were used for the statistical analysis. RESULTS At the end of year 4, there was no loss of restoration in any group. According to the USPHS and FDI criteria, there was a difference in the baseline and 4-year in marginal adaptation and marginal discoloration of the restorations (P < 0.05). When Filtek-Bulk was placed as an incremental technique, there was a minor fracture in four restorations (P > 0.05). In addition, Filtek-Bulk showed a color change according to the results based on both the USPHS and FDI criteria (P < 0.05). The difference between the two placement techniques of each resin composite was not significant at the year 4 recall when all criteria were evaluated (P ˃ 0.05). CONCLUSIONS The 4-year clinical success of the evaluated bulk-fill composites is not dependent on the placement technique used. CLINICAL RELEVANCE This study can help clinicians choose which technique (bulk fill and incremental techniques) bulk-fill composites can be used. TRIAL REGISTRATION US National Library of Medicine, www. CLINICALTRIALS gov , ID: NCT04565860 Registered on 10/09/2020. Clinical Evaluation of Bulk-fill resin Composites in Class II Restorations.
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Strini BS, Marques JFDL, Pereira R, Sobral-Souza DF, Pecorari VGA, Liporoni PCS, Aguiar FHB. Comparative Evaluation of Bulk-Fill Composite Resins: Knoop Microhardness, Diametral Tensile Strength and Degree of Conversion. Clin Cosmet Investig Dent 2022; 14:225-233. [PMID: 35957701 PMCID: PMC9359371 DOI: 10.2147/ccide.s376195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Accepted: 07/21/2022] [Indexed: 12/04/2022] Open
Abstract
Purpose Bulk-fill composite resins were developed to reduce time and facilitate the restorative procedure. However, considering their recent introduction on the market and the new formulations, their performance still requires evaluation. This study aimed to evaluate Knoop microhardness (KHN), diametral tensile strength (DTS) and degree of conversion (DC) of three Bulk-Fill composite resins and a conventional one. Materials and Methods Sixty samples (n = 15; 8 mm ø x 4 mm height) were confectioned using a mold. Filtek Bulk-Fill (FBF), Tetric N-Ceram Bulk-Fill (TNC) and SonicFill 2 (SF2) were placed in 4 mm increments, and Filtek Z350 (FZ350) was placed in 2 mm increments. The KHN of top and bottom surfaces were tested using Knoop Hardness tester at 10 gf/10s. The DTS was tested under compressive load at 1.0 mm/min. The DC was measured by Fourier Transform Infrared (FTIR) spectroscopy. Differences in DTS and DC were analyzed by ANOVA and Tukey post hoc test. For KHN, Kruskal–Wallis and Wilcoxon tests were performed at α = 0.05. Results Top surfaces of all composite resins had higher KHN than bottom surfaces. At top and bottom surfaces, FZ350 showed higher KHN than TNC and SF2. The highest DTS was obtained by FBF, followed by FZ350 and SF2. The highest DC was obtained by SF2, the lowest one was obtained by FBF. Conclusion From Bulk-Fill composite resins, FBF presented the best KHN and DTS results. The SF2 showed the best DC. Further studies are required to ensure whether these differences can negatively influence the behavior of in vivo restorations.
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Affiliation(s)
- Bruna Scarcello Strini
- Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, SP, Brazil
| | - Joyce Figueiredo de Lima Marques
- Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, SP, Brazil
- Correspondence: Joyce Figueiredo de Lima Marques, Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Av. Limeira, 901, Piracicaba, SP, 13414-903, Brazil, Tel +55 19 2106-5337; +55 84 99966-8539, Fax +55 19 3421-0144, Email
| | - Renata Pereira
- Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, SP, Brazil
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