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Silva SEGD, Lima JMC, Lima EG, Melo RM, Bottino MA, Souza ROAE. Effect of cementation protocols on the fracture load of bilayer ceramic crowns manufactured by the Rapid Layer Technology. Braz Dent J 2024; 35:e245917. [PMID: 39320003 PMCID: PMC11405011 DOI: 10.1590/0103-6440202405917] [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: 01/28/2024] [Accepted: 07/03/2024] [Indexed: 09/26/2024] Open
Abstract
To evaluate the fracture load of bilayer ceramic crowns manufactured by Rapid Layer Technology (RLT) after different cementation protocols of the veneering ceramic to the zirconia infrastructures. Sixty epoxy resin preparations simulating a molar tooth were obtained and 60 zirconia infrastructures and feldspathic crowns were manufactured by RLT and divided into 6 groups according to the cementation protocol at the interface to veneering ceramic (n=10): Ctr- control: conventional resin cement; Al- Al2O3 sandblasting 50µm + conventional resin cement; Al/MDP- Al2O3 sandblasting (50µm) + resin cement with MDP; Sil- silicatization 30µm + conventional resin cement; Gl/HF- glaze + hydrofluoridric acid (5%,60s) + silane + conventional resin cement; Gl- glazing as bonding agent. The feldspathic ceramic internal surface was etched with fluoridric acid (5%) + silane followed by cementation according to respective protocols. All samples were mechanically cycled (200N and 4.5x105 Pa, 37°C, 2x106 cycles, 3.4Hz) and submitted to axial compressing fracture load test (10kN, 0.5mm/min). The results(N) were submitted to descriptive and analytical statistical analysis with 1-way ANOVA, Weibull, and the Tukey test (α=0.05). ANOVA revealed that there was a significant difference among the tested groups (p<0.0001). The group Al/MDP presented the higher resistance to fracture (1972.46A N), followed by the Ctr group (1584.41B N). The characteristic strength(σ0) was significantly different (p=0.000). The crack and chipping were the predominant failures. The air-abrasion at the external surface of zirconia with Al2O3 followed by cementation with MDP resin cement, should be selected to Rapid Layer Technique when felspathic ceramic is used as veneer ceramic.
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Affiliation(s)
| | - Júlia M Costa Lima
- Institute of Science and Technology(ICT),Department of Dental Materials and Prosthodontics,São Paulo State University(UNESP/FOSJC).Brasil
| | - Elen G Lima
- Institute of Science and Technology(ICT),Department of Dental Materials and Prosthodontics,São Paulo State University(UNESP/FOSJC).Brasil
| | - Renata M Melo
- Institute of Science and Technology(ICT),Department of Dental Materials and Prosthodontics,São Paulo State University(UNESP/FOSJC).Brasil
| | - Marco A Bottino
- Institute of Science and Technology(ICT),Department of Dental Materials and Prosthodontics,São Paulo State University(UNESP/FOSJC).Brasil
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Lamparth I, Angermann J, Fässler P, Schnur T, Graff B, Ohl C, Lalevée J, Catel Y. Influence of the hydroperoxide structure on the reactivity and mechanical properties of self-cure dental composites. Dent Mater 2024; 40:1191-1198. [PMID: 38851966 DOI: 10.1016/j.dental.2024.06.008] [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: 01/19/2024] [Revised: 06/03/2024] [Accepted: 06/03/2024] [Indexed: 06/10/2024]
Abstract
OBJECTIVES Hydroperoxides are key constituents of two-component dental materials. The objective of this study was to evaluate the influence of the hydroperoxide structure on the reactivity and on the mechanical properties of self-cure composites. METHODS Hydroperoxides HP1-3 were synthesized by selective catalytic oxidation of the corresponding para-substituted cumene precursors and isolated in high purity. They were characterized by 1H NMR and 13C NMR spectroscopy. 16 self-cure composites, based on the redox initiator system hydroperoxide (Cumene hydroperoxide (CHP), HP1-3 or tert.-Amyl hydroperoxide (TAH))/polymerizable thiourea ATU1/copper(II) acetylacetonate, were formulated in Sulzer Mixpac two-component syringes. An equimolar hydroperoxide/ATU1 ratio was selected for each self-cure composite. The reactivity and the final double-bond conversions obtained with these two-component materials was assessed using RT-FTIR spectroscopy. The flexural strength and modulus were measured using a three-point bending setup, after storage of the specimens for 45 min at 37 °C (dry) and for 24 h in water at 37 °C. The working time of each self-cure composite was measured using an oscillating rheometer. RESULTS CHP derivatives bearing an electron withdrawing group (HP2: ester or HP3: nitrile) in the para position were found to be more reactive than CHP, whereas the compound bearing an electron donating group (tert-butyl, HP1) was less reactive; molecular modelling data were reported for a better understanding of this structure/reactivity/efficiency relationship. All CHP derivatives were more reactive than the aliphatic hydroperoxide TAH. Excellent mechanical properties were obtained with self-cure composites containing either CHP or a para-functionalized CHP derivative. By carefully selecting the amounts of oxidizing/reducing agents and metal catalyst, suitable working times can be obtained with all evaluated hydroperoxides. HP3, thanks to its high reactivity, is nonetheless the most promising compound. SIGNIFICANCE The curing rate of self-cure composites can be adapted by modifying the structure of the hydroperoxide. In agreement with molecular modelling data, the incorporation of CHP derivatives bearing an electron withdrawing group in the para position is particularly attractive. Indeed, due to a significant reactivity enhancement, the desired properties (working time, flexural strength/modulus) can be obtained by incorporating moderate amounts of hydroperoxide/acylthiourea as well as particularly low contents of metal catalyst to the two-component dental materials.
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Affiliation(s)
- Iris Lamparth
- Ivoclar Vivadent AG, Bendererstrasse 2, FL-9494 Schaan, Liechtenstein
| | - Jörg Angermann
- Ivoclar Vivadent AG, Bendererstrasse 2, FL-9494 Schaan, Liechtenstein
| | - Pascal Fässler
- Ivoclar Vivadent AG, Bendererstrasse 2, FL-9494 Schaan, Liechtenstein
| | - Thomas Schnur
- Ivoclar Vivadent AG, Bendererstrasse 2, FL-9494 Schaan, Liechtenstein
| | - Bernadette Graff
- Université de Haute-Alsace, CNRS, IS2M UMR 7361, F-68100 Mulhouse, France; Université de Strasbourg, France
| | - Coralie Ohl
- Université de Haute-Alsace, CNRS, IS2M UMR 7361, F-68100 Mulhouse, France; Université de Strasbourg, France
| | - Jacques Lalevée
- Université de Haute-Alsace, CNRS, IS2M UMR 7361, F-68100 Mulhouse, France; Université de Strasbourg, France
| | - Yohann Catel
- Ivoclar Vivadent AG, Bendererstrasse 2, FL-9494 Schaan, Liechtenstein.
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Başol EU, Vallittu PK, Lassila LVJ, Cekic Nagas I. Effect of bioactive glass particles on mechanical and adhesion properties of resin cements. J Prosthodont Res 2024; 68:105-113. [PMID: 37164657 DOI: 10.2186/jpr.jpr_d_22_00314] [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: 05/12/2023]
Abstract
PURPOSE The aim of this study is to evaluate the mechanical and adhesive properties of three different resin cements with bioactive glass (BAG) incorporated in two different ratios. METHODS BAG was added to different resin cements (3M Rely-X Ultimate, GC Link Ace, and GC Link Force) in different ratios (5% and 10% by weight). The three-point flexural strength, microhardness, and bond strength properties were evaluated. The fracture types of the groups were then analyzed using a stereo microscope. The data were analyzed using a multifactorial analysis of variance and Tukey's post-hoc tests (α < 0.05). RESULTS The addition of BAG reduced the flexural strength of the resin cements (P < 0.05).The effect of BAG addition on the Vickers microhardness value was significantly different for each cement group (P < 0.05). In addition, with the exception of the GC link force group (10% BAG addition), the BAG addition decreased the bond strength of cements to dentin in all the groups (P = 0.171). CONCLUSIONS The results of this study confirmed that different resin cements comprising different ratios of BAG exhibited different flexural strength, hardness, and bond-strength properties. Since the bond strength values increased with the addition of 10% BAG in the GC Link Force cement group, the effects of different BAG compositions could be worth investigating in future studies.
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Affiliation(s)
- Ece Ucar Başol
- Gazi University, Faculty of Dentistry, Department of Prosthodontics, Ankara, Türkiye
| | - Pekka Kalevi Vallittu
- University of Turku, Institute of Dentistry, Department of Biomaterials Science and Turku Clinical Biomaterials Centre - TCBC, Turku, Finland
| | - Lippo Veli Juhana Lassila
- University of Turku, Institute of Dentistry, Department of Biomaterials Science and Turku Clinical Biomaterials Centre - TCBC, Turku, Finland
| | - Isil Cekic Nagas
- Gazi University, Faculty of Dentistry, Department of Prosthodontics, Ankara, Türkiye
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Catel Y, Angermann J, Grob B, Fässler P, Lamparth I, Schnur T. Acylthiourea oligomers as promising reducing agents for dimethacrylate-based two-component dental materials. Dent Mater 2023; 39:886-893. [PMID: 37591708 DOI: 10.1016/j.dental.2023.07.007] [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: 04/27/2023] [Revised: 07/18/2023] [Accepted: 07/20/2023] [Indexed: 08/19/2023]
Abstract
OBJECTIVES Currently used thiourea-based two-component dental materials may release bitter compounds if they are not properly cured. To address this issue, the objective of this study was to evaluate the potential of acylthiourea oligomers as reducing agents for the development of self-cure composites. METHODS Acylthiourea oligomers ATUO1-3 were synthesized via cotelomerization of the acylthiourea methacrylate ATU1 with butyl methacrylate. They were characterized by 1H NMR spectroscopy and size exclusion chromatography. Self-cure composites based on the redox initiator system cumene hydroperoxide/acylthiourea oligomer/copper(II) acetylacetonate were formulated. The flexural strength and modulus were measured using a three-point bending setup. The double bond conversions were determined using NIR spectroscopy. The working time of each self-cure composite was measured using an oscillating rheometer. Leaching experiments using light-cure composites were performed in DMSO-d6. RESULTS Acylthiourea oligomers ATUO1-3 were successfully synthesized in good yields. Both the oligomer molecular weight and the amount of thiourea groups were varied. Self-cure composites containing ATUO1 or ATUO2 as reducing agents exhibited excellent mechanical properties and high double-bond conversions. The amounts of reducing agent, cumene hydroperoxide and copper(II) acetylacetonate were shown to have a significant impact on the working time. Moreover, a correlation between flexural modulus and the amount of metal salt was clearly established. Self-cure composites containing the oligomer ATUO1 exhibited a longer working time than materials containing ATU1 or acetylthiourea. Contrary to acetylthiourea, ATUO1 was not able to leach out of light-cured composites. SIGNIFICANCE Acylthiourea oligomers are promising reducing agents for the formulation of two-component dental materials that do not induce a bitter taste in mouth.
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Affiliation(s)
- Yohann Catel
- Ivoclar Vivadent AG, Bendererstrasse 2, FL-9494 Schaan, Liechtenstein.
| | - Jörg Angermann
- Ivoclar Vivadent AG, Bendererstrasse 2, FL-9494 Schaan, Liechtenstein
| | - Benjamin Grob
- Ivoclar Vivadent AG, Bendererstrasse 2, FL-9494 Schaan, Liechtenstein
| | - Pascal Fässler
- Ivoclar Vivadent AG, Bendererstrasse 2, FL-9494 Schaan, Liechtenstein
| | - Iris Lamparth
- Ivoclar Vivadent AG, Bendererstrasse 2, FL-9494 Schaan, Liechtenstein
| | - Thomas Schnur
- Ivoclar Vivadent AG, Bendererstrasse 2, FL-9494 Schaan, Liechtenstein
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Hyperbaric Pressure Effect on Dental Luting Cements. JOURNAL OF BASIC AND CLINICAL HEALTH SCIENCES 2022. [DOI: 10.30621/jbachs.1187298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Background and Purpose: The aim of this study was to evaluate the flexural strength values of five luting cements that are commonly used in dental restorations after exposed to hyperbaric pressure.
Methods: Five luting cements (polycarboxylate cement, glass ionomer luting cement, manual-mixed resin cement, and two auto-mixed resin cement) were prepared. (25 x 2 x 2 mm3) (n=16 for each) The specimens were divided into two subgroups (n=8) and were exposed to hyperbaric pressure (3 ATM) 20 times for 30 minutes. The control groups stored in ambient pressure. Universal testing machine was used for flexural strength measurement with a crosshead speed of 1 mm/min.
Results: One-way ANOVA test was used for statistical analysis, the differences in flexural strength values were additionally evaluated by Weibull Analysis. Glass ionomer and polycarboxylate cement were the most effected resins from hyperbaric pressure changes. Regardless of the pressure changes, the highest flexural strength values were seen for the self-adhesive resin cements and polycarboxylate cement showed the lowest strength value.
Conclusion: Resin cements can be used for cementation of the dental restorations in divers and individuals who are subjected to hyperbaric pressure.
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Carek A, Dukaric K, Miler H, Marovic D, Tarle Z, Par M. Post-Cure Development of the Degree of Conversion and Mechanical Properties of Dual-Curing Resin Cements. Polymers (Basel) 2022; 14:polym14173649. [PMID: 36080725 PMCID: PMC9460751 DOI: 10.3390/polym14173649] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Revised: 08/28/2022] [Accepted: 08/30/2022] [Indexed: 11/17/2022] Open
Abstract
This study investigated the effect of different curing conditions on the degree of conversion and mechanical properties of contemporary dual-curing resin cements. The material specimens were either light-cured directly, light-cured through a 1-mm lithium disilicate glass-ceramic layer, or self-cured. The degree of conversion was measured in 0.1-mm films using Fourier-transform infrared spectroscopy 1 day, 7 days, and 28 days post-cure. Specimens used to study the flexural strength and modulus were prepared according to the ISO 4049 protocol, stored for 28 days post-cure, and subjected to accelerated aging by absolute ethanol immersion. The degree of conversion values ranged between 44.3–77.8%. Flexural strength varied between 11.4–111.1 MPa, while flexural modulus amounted to 0.7–5.5 GPa. The degree of conversion was significantly affected by material type, curing conditions, and post-cure time; however, variations in curing conditions were the least influential factor. A statistically significant effect of curing conditions on the degree of conversion was identified for only one of the five materials tested, whereas the flexural strength and modulus of all tested materials were significantly reduced in the experimental groups that were light-cured through a ceramic layer or self-cured. The effect size analysis showed that mechanical properties were most affected by the material type, while the differences in curing conditions were less influential. A comparison of the degree of conversion and mechanical properties indicated that different curing conditions may lead to significantly different flexural strength and modulus, which are not necessarily accompanied by identifiable variations in the degree of conversion.
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Affiliation(s)
- Andreja Carek
- Department of Fixed Prosthodontics, School of Dental Medicine, University of Zagreb, Gunduliceva 5, 10000 Zagreb, Croatia
| | - Ksenija Dukaric
- School of Dental Medicine, University of Zagreb, Gunduliceva 5, 10000 Zagreb, Croatia
| | - Helena Miler
- School of Dental Medicine, University of Zagreb, Gunduliceva 5, 10000 Zagreb, Croatia
| | - Danijela Marovic
- Department of Endodontics and Restorative Dentistry, School of Dental Medicine, University of Zagreb, Gunduliceva 5, 10000 Zagreb, Croatia
| | - Zrinka Tarle
- Department of Endodontics and Restorative Dentistry, School of Dental Medicine, University of Zagreb, Gunduliceva 5, 10000 Zagreb, Croatia
| | - Matej Par
- Department of Endodontics and Restorative Dentistry, School of Dental Medicine, University of Zagreb, Gunduliceva 5, 10000 Zagreb, Croatia
- Correspondence:
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Lamparth I, Fässler P, Schnur T, Thetiot E, Lalevée J, Catel Y. Polymerizable thioureas as innovative reducing agents for self-cured and dual-cured dental materials. Dent Mater 2022; 38:1108-1116. [PMID: 35589440 DOI: 10.1016/j.dental.2022.04.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 04/27/2022] [Accepted: 04/27/2022] [Indexed: 11/03/2022]
Abstract
OBJECTIVE To evaluate polymerizable acylthioureas as reducing agents in two-component dental materials. METHODS Acylthioureas 1 and 2 were synthesized and characterized by 1H and 13C NMR spectroscopy. Self-cured composites based on the redox initiator system cumene hydroperoxide/acylthiourea 1 or 2/copper(II) acetylacetonate were formulated. Various amounts of cumene hydroperoxide, acylthiourea and copper(II) acetylacetonate were used. An equimolar cumene hydroperoxide/acylthiourea ratio was selected for each self-cured composite. The reactivity and the final double-bond conversions obtained with these two-component materials was assessed using RT-FTIR spectroscopy. The flexural strength and modulus were measured using a three-point bending setup, after storage of the specimens for 45 min at 37 °C (dry) and for 24 h in water at 37 °C. The working time of each composite was determined using an oscillating rheometer. RESULTS Acylthioureas 1 and 2 were synthesized in three to four steps. In combination with cumene hydroperoxide and copper(II) acetylacetonate, both prepared compounds were found to be effective reducing agents. The higher the amount of cumene hydroperoxide and acylthiourea in the self-cured composite, the higher the flexural modulus and the faster the polymerization (lower working times). Similarly, it was shown that increased copper(II) acetylacetonate amounts result in an acceleration of the curing as well as in an improvement of the mechanical properties. The self-cured composite containing 1.25 wt% of cumene hydroperoxide in the monomer mixture of the first paste and 2.00 wt% of acylthiourea 1 in the monomer mixture of the second one provided excellent mechanical properties as well as an optimal working time. SIGNIFICANCE Polymerizable acylthioureas can be used as reducing agents in two-component dental materials. Due to the presence of the methacrylate group, such structures should be efficiently incorporated into the network during polymerization and should not leach out of the composite after curing. As a result, such dental materials are not expected to exhibit bitterness properties.
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Affiliation(s)
- Iris Lamparth
- Ivoclar Vivadent AG, Bendererstrasse 2, FL-9494 Schaan, Liechtenstein
| | - Pascal Fässler
- Ivoclar Vivadent AG, Bendererstrasse 2, FL-9494 Schaan, Liechtenstein
| | - Thomas Schnur
- Ivoclar Vivadent AG, Bendererstrasse 2, FL-9494 Schaan, Liechtenstein
| | - Estelle Thetiot
- Université de Haute-Alsace, CNRS, IS2M UMR 7361, F-68100 Mulhouse, France; Université de Strasbourg, France
| | - Jacques Lalevée
- Université de Haute-Alsace, CNRS, IS2M UMR 7361, F-68100 Mulhouse, France; Université de Strasbourg, France
| | - Yohann Catel
- Ivoclar Vivadent AG, Bendererstrasse 2, FL-9494 Schaan, Liechtenstein.
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AlAali KA, AlHelal A, Almahri JR, Albakri AA, Albani RM, Alhaizan YA, Alhamdan MM, Alaql NA, Binhasan M, Alhamdan EM, Albaqawi AH, Vohra F, Abduljabbar T. Influence of Conventional Polymer, Hybrid Polymer and Zinc Phosphate Luting Agents on the Bond Strength of Customized Zirconia Post in Premolars-An In-Vitro Evaluation. Polymers (Basel) 2022; 14:polym14040758. [PMID: 35215671 PMCID: PMC8879678 DOI: 10.3390/polym14040758] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2022] [Revised: 02/02/2022] [Accepted: 02/04/2022] [Indexed: 02/01/2023] Open
Abstract
The aim was to identify the influence of conventional polymeric resin based cement (RC), hybrid polymer modified glass ionomer (RMGIC) and Zinc phosphate cement (ZPC) on the pull out strength of the customized zirconia post in premolars. Access cavity and root canals were performed in sixty premolar teeth with the standardized crown down technique (ProTaper Universal, Dentsply). Post space impressions were scanned, and the pre-sintered Zenostar Zr Translucent blanks (Weiland Dental, Pforzheim) were milled with the Opera-system to form the post. All prepared specimens were divided equally in three groups based on the cement type employed for luting as follows: group A: ZPC; group B (GC Fuji PLUS Capsule): RMGIC; group C (and RC (3M RelyX ARC). Ten specimens in each group were thermocycled (TC) at 5 and 55 °C in distilled water baths (40,000 cycles). Pull out bond strength was assessed using a universal testing machine at 0.5 mm/min. The means and standard deviations were compared using ANOVA and Tukey Kramer multiple comparisons tests. A significant difference among the cement groups as well as between TC and non-thermocycled (NTC) groups (p < 0.05) was observed. The highest tensile stress was demonstrated among group C (Resin, 69.89 ± 4.81 (NTC), 64.06 ± 4.36 (TC)) with the least in group A, (zinc phosphate, 43.66 ± 5.02 (NTC), 37.70 ± 5.10 (TC)) for both groups. Group A presented with 100% adhesive bond failures, followed by 80% in group C and 70% in group B, respectively. A similar outcome was observed in the TC group for the cement; however, unlike the NTC group, the TC group showed more cohesive failures compared to the NTC mixed failure. Dual cure polymer based cement demonstrated higher bond strength and efficient adhesive bonding of the customized Zr post with root dentine compared to zinc phosphate (non-polymeric) and RMGIC (hybrid polymer). Thermocycling compromised Zr post adhesive bonding to root dentin.
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Affiliation(s)
- Khulud A. AlAali
- Department of Clinical Dental Sciences, College of Dentistry, Princess Nourah Bint Abdulrahman University, Riyadh 11671, Saudi Arabia
- Correspondence: (K.A.A.); (T.A.)
| | - Abdulaziz AlHelal
- Prosthetic Dental Science Department, College of Dentistry, King Saud University, Riyadh 11545, Saudi Arabia; (A.A.); (M.M.A.); (E.M.A.); (F.V.)
| | - Jawaher R. Almahri
- Prosthodontics Postgraduate Resident, College of Dentistry, Princess Nourah Bint Abdulrahman University, Riyadh 11671, Saudi Arabia;
| | - Aroob A. Albakri
- General Dentist, College of Dentistry, Princess Nourah Bint Abdulrahman University, Riyadh 11671, Saudi Arabia;
| | - Ragad M. Albani
- Prosthodontics Postgraduate Resident, College of Dentistry, King Saud University, Riyadh 11671, Saudi Arabia;
| | - Yasmeen A. Alhaizan
- Restorative Postgraduate Resident, King Faisal Specialist Hospital, Riyadh 11211, Saudi Arabia;
| | - Mai M. Alhamdan
- Prosthetic Dental Science Department, College of Dentistry, King Saud University, Riyadh 11545, Saudi Arabia; (A.A.); (M.M.A.); (E.M.A.); (F.V.)
| | - Naif A. Alaql
- Prosthodontic Department, Riyadh Specialized Dental Center, Ministry of Health, Riyadh 13226, Saudi Arabia;
| | - Mashael Binhasan
- Department of Restorative Dentistry, Division of Operative Dentistry, College of Dentistry, King Saud University, Riyadh 11545, Saudi Arabia;
| | - Eman M. Alhamdan
- Prosthetic Dental Science Department, College of Dentistry, King Saud University, Riyadh 11545, Saudi Arabia; (A.A.); (M.M.A.); (E.M.A.); (F.V.)
| | - Ahmed H. Albaqawi
- Department of Restorative Dental Science, College of Dentistry, University of Ha’il, Ha’il 55476, Saudi Arabia;
| | - Fahim Vohra
- Prosthetic Dental Science Department, College of Dentistry, King Saud University, Riyadh 11545, Saudi Arabia; (A.A.); (M.M.A.); (E.M.A.); (F.V.)
| | - Tariq Abduljabbar
- Prosthetic Dental Science Department, College of Dentistry, King Saud University, Riyadh 11545, Saudi Arabia; (A.A.); (M.M.A.); (E.M.A.); (F.V.)
- Correspondence: (K.A.A.); (T.A.)
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Oguz Ahmet BS, Sayin Ozel G, Mutluay MM, Tezvergil Mutluay A. Effect of gallic acid addition on some mechanical properties of self-adhesive resin cements. Braz Oral Res 2019; 33:e053. [PMID: 31531561 DOI: 10.1590/1807-3107bor-2019.vol33.0053] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2018] [Accepted: 06/05/2019] [Indexed: 01/22/2023] Open
Abstract
Self-adhesive resin cements (RCs) activate matrix metalloproteinase (MMP) and cathepsin-related collagen degradation, and gallic acid (GA) inhibits the activity of both MMPs and cysteine cathepsins. The purpose of this study was to evaluate the setting time, biaxial flexural strength, and Vickers hardness of self-adhesive RCs after the addition of two different concentrations of GA. RelyX U200 (3M ESPE) and Panavia SA (Kuraray) were modified with 0.5 and 1 wt% GA. The setting time of five samples in each RC group was assessed using a thermocouple apparatus as described in the ISO 4049 test. Biaxial flexure strength was measured using a universal testing machine until failure. Vickers hardness was measured with three randomized indentations on the surface of each resin disc. RCs without GA were used as control. Data were analyzed using a one-way analysis of variance and Tukey's HSD test (α = 0.05). The setting times ranged from 2.4 to 4.6 min for RelyX and from 4.9 to 6.0 min for Panavia. The biaxial flexure strength ranged from 76.5 to 109.7 MPa for RelyX and from 73.3 to 108.2 MPa for Panavia. Vickers hardness values ranged from 41.6 to 58.6 for RelyX and 27.2 to 33.6 for Panavia. The addition of 0.5 and 1 wt% GA to improve durability of resin-dentin bonds had no adverse effects on setting time, whereas the biaxial flexure strength and Vickers hardness values for the tested materials were significantly reduced.
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Affiliation(s)
- Bebek Serra Oguz Ahmet
- Istanbul Medipol University, School of Dentistry, Department of Prosthodontics, Istanbul, Turkey
| | - Gulsum Sayin Ozel
- Istanbul Medipol University, School of Dentistry, Department of Prosthodontics, Istanbul, Turkey
| | - Mustafa Murat Mutluay
- University of Eastern Finland, Institute of Dentistry, Department of Prosthetic Dentistry, Kuopio, Finland
| | - Arzu Tezvergil Mutluay
- University of Turku, Institute of Dentistry, Department of Restorative Dentistry and Cariology, Turku, Finland
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Lima RBW, Murillo-Gómez F, Sartori CG, De Góes MF. Effect of light absence or attenuation on biaxial flexural strength of dual-polymerized resin cements after short- and long-term storage. J ESTHET RESTOR DENT 2018; 31:80-87. [PMID: 30394656 DOI: 10.1111/jerd.12427] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 07/16/2018] [Accepted: 09/05/2018] [Indexed: 11/28/2022]
Abstract
OBJECTIVE To evaluate whether biaxial flexural strength (BFS) of dual resin cements is affected by light absence or attenuation, storage time, or cements' chemical nature. MATERIALS AND METHODS One hundred and twenty disk-shaped specimens were made from each cement (non-self-adhesive cement and self-adhesive cement) using Teflon molds on a controlled temperature surface (35°C). Specimens were polymerized as follows (N = 30): self-cured, directly light-cured, light-cured at a distance of 6 mm between the light tip and the specimen, and through a 6-mm thick composite resin barrier (indirectly light-cured). Each group was divided (N = 10) for storage purposes (15 minutes, 24 hours, and 6 months). Specimens were placed into a biaxial-flexure jig and a vertical load was applied until failure. The BFS values were subjected to generalized linear models statistical analysis and Weibull distributions (α = 0.05). RESULTS After 15 minutes aging, neither material achieved enough polymerization to perform the BFS test when polymerized using the self-curing mode. The self-adhesive product demonstrated much lower variation in strength with storage time than did the non-self-curing cement. CONCLUSIONS Attenuated/light-curing reduced BFS values only for 15-minutes storage period for both materials. Flexural strength of the self-adhesive cement was less affected by light absence/attenuation and storage time. CLINICAL SIGNIFICANCE Biaxial flexural strength of a self-adhesive resin cement is less sensitive to variation in light application and storage time than is a non-self-adhesive cement.
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Affiliation(s)
- Renally B W Lima
- Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, São Paulo, Brazil
| | - Fabián Murillo-Gómez
- Department of Restorative Dentistry, School of Dentistry, University of Costa Rica, San José, Costa Rica
| | - Cristiana G Sartori
- Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, São Paulo, Brazil
| | - Mário F De Góes
- Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, São Paulo, Brazil
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Galvão MNA, Brandt WC, Miranda ME, Vitti RP. Resistência à compressão, flexão e tração diametral de cimentos resinosos em tempos diferentes de armazenamento. JOURNAL OF ORAL INVESTIGATIONS 2018. [DOI: 10.18256/2238-510x.2018.v7i2.2777] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Objetivos: O objetivo desse estudo foi avaliar a resistência à compressão, tração diametral e flexão de dois cimentos resinosos de presa dual. Métodos: foi utilizado o cimento autoadesivo RelyX U200 (3M ESPE) e o cimento convencional Variolink II (Ivoclar Vivadent). Foram confeccionados corpos de prova cilíndricos com 4mm de diâmetro x 6mm de altura para o teste de compressão, 6mm de diâmetro x 2mm de altura para o teste de tração diametral (ISO 9917-1:2007) e em forma de barra com 25mm de comprimento x 2mm de altura e largura para o teste de flexão três pontos (ISO 4049:2009). As amostras foram armazenadas por 24h (n = 10) e 45 dias (n = 10) em água destilada a 37ºC. Os testes foram realizados em uma máquina universal de ensaios EMIC (DL 2000) com uma célula de carga de 2000 Kgf para o teste de compressão e 200 Kgf para os testes de tração diametral e flexão, à uma velocidade de 0,5 mm/min. Os dados foram submetidos à análise de variância dois critérios (ANOVA) e as médias comparadas pelo teste de Tukey (5%). Resultados: os resultados mostraram valores estatisticamente similares para todas as propriedades mecânicas avaliadas entre todos os cimentos e tempos de armazenamento estudados. Conclusões: A composição química dos cimentos resinosos e o armazenamento em água por 45 dias não foram suficientes para ocasionar alterações nas propriedades mecânicas avaliadas nesse estudo.
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Wong ACH, Tian T, Tsoi JKH, Burrow MF, Matinlinna JP. Aspects of adhesion tests on resin–glass ceramic bonding. Dent Mater 2017; 33:1045-1055. [DOI: 10.1016/j.dental.2017.06.013] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Revised: 06/02/2017] [Accepted: 06/22/2017] [Indexed: 11/16/2022]
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Cassina G, Fischer J, Rohr N. Correlation between flexural and indirect tensile strength of resin composite cements. Head Face Med 2016; 12:29. [PMID: 27809863 PMCID: PMC5096060 DOI: 10.1186/s13005-016-0128-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Accepted: 10/26/2016] [Indexed: 11/10/2022] Open
Abstract
Background To evaluate a potential correlation between flexural strength and indirect tensile strength in assessing the mechanical strength of resin composite cements. Methods Flexural strength (n = 5) and indirect tensile strength (n = 5) of 7 resin composite cements (RelyX Unicem 2 Automix [RXU], Panavia SA [PSA], Clearfil SA [CSA], Panavia F2.0 [PF2], Multilink Implant [MLI], DuoCem [DCM], Panavia 21 [P21]) were determined. Specimens were either auto-polymerized or dual-cured (except P21) and stored in water at 37 °C for 1 day prior to measurement. Flexural and indirect tensile strength of 4 cements (RXU, PSA, PF2, MLI) was additionally measured directly after curing and after 96 h water storage at 37 °C. Results Except for PF2, dual-cured specimens achieved higher flexural strength than auto-polymerized specimens. In the indirect tensile strength test differences in auto-polymerized and dual-cured specimens were only detected for RXU and DCM. A general non-linear correlation was found between flexural and indirect tensile strength values. However, strength values of auto-polymerized and dual-cured specimens did not generally correlate. Conclusions Flexural strength and indirect tensile strength of resin composite cements are correlated. At high strength values the indirect tensile test is less sensitive than the flexural test. The results suggest that the indirect tensile test may only be recommended as a screening test especially for low or medium strength resin composite cements.
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Affiliation(s)
- Gianluca Cassina
- Division of Dental Materials and Engineering, Clinic for Reconstructive Dentistry and Temporomandibular Disorders, University Hospital of Dental Medicine, University of Basel, Hebelstrasse 3, 4056, Basel, Switzerland
| | - Jens Fischer
- Division of Dental Materials and Engineering, Clinic for Reconstructive Dentistry and Temporomandibular Disorders, University Hospital of Dental Medicine, University of Basel, Hebelstrasse 3, 4056, Basel, Switzerland
| | - Nadja Rohr
- Division of Dental Materials and Engineering, Clinic for Reconstructive Dentistry and Temporomandibular Disorders, University Hospital of Dental Medicine, University of Basel, Hebelstrasse 3, 4056, Basel, Switzerland.
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Furtos G, Naghiu MA, Declercq H, Gorea M, Prejmerean C, Pana O, Tomoaia-Cotisel M. Nano forsterite biocomposites for medical applications: Mechanical properties and bioactivity. J Biomed Mater Res B Appl Biomater 2015; 104:1290-301. [DOI: 10.1002/jbm.b.33396] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2014] [Revised: 01/20/2015] [Accepted: 02/08/2015] [Indexed: 11/06/2022]
Affiliation(s)
- Gabriel Furtos
- Department of Dental Materials; Raluca Ripan Institute of Research in Chemistry, Babes-Bolyai University; Cluj-Napoca Romania
| | - Marieta-Adriana Naghiu
- Department of Chemical Engineering, Faculty of Chemistry and Chemical Engineering; Babes-Bolyai University; Cluj-Napoca Romania
| | - Heidi Declercq
- Department of Basic Medical Sciences, Tissue Engineering Group; Ghent University; Ghent Belgium
| | - Maria Gorea
- Department of Chemical Engineering, Faculty of Chemistry and Chemical Engineering; Babes-Bolyai University; Cluj-Napoca Romania
| | - Cristina Prejmerean
- Department of Dental Materials; Raluca Ripan Institute of Research in Chemistry, Babes-Bolyai University; Cluj-Napoca Romania
| | - Ovidiu Pana
- Physics of Nanostructured Systems Department; National Institute for R&D of Isotopic and Molecular Technology; Cluj-Napoca Romania
| | - Maria Tomoaia-Cotisel
- Department of Chemical Engineering, Faculty of Chemistry and Chemical Engineering; Babes-Bolyai University; Cluj-Napoca Romania
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Aguiar TR, de Oliveira M, Arrais CA, Ambrosano GM, Rueggeberg F, Giannini M. The effect of photopolymerization on the degree of conversion, polymerization kinetic, biaxial flexure strength, and modulus of self-adhesive resin cements. J Prosthet Dent 2015; 113:128-34. [DOI: 10.1016/j.prosdent.2014.09.011] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Revised: 08/30/2014] [Accepted: 09/02/2014] [Indexed: 11/30/2022]
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Derceli JDR, Fais LMG, Pinelli LAP. A castor oil-containing dental luting agent: effects of cyclic loading and storage time on flexural strength. J Appl Oral Sci 2015; 22:496-501. [PMID: 25591018 PMCID: PMC4307762 DOI: 10.1590/1678-775720140069] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Accepted: 08/08/2014] [Indexed: 11/21/2022] Open
Abstract
Favorable results in the use of castor oil polyurethane (COP) as pulp capping, membrane material, sealer, mouthwash and in bone repair, associated with the fact that Ricinus communis is not derived from petroleum and it is abundant in Brazil, encourage researches in the development of luting agents.
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Affiliation(s)
- Juliana Dos Reis Derceli
- Department of Restorative Dentistry, Ribeirão Preto School of Dentistry, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Laiza Maria Grassi Fais
- Department of Dental Materials and Prosthodontics, Araraquara Dental School, Universidade Estadual Paulista, Araraquara, SP, Brazil
| | - Lígia Antunes Pereira Pinelli
- Department of Dental Materials and Prosthodontics, Araraquara Dental School, Universidade Estadual Paulista, Araraquara, SP, Brazil
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