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Ansarifard E, Panbehzan Z, Giti R. Evaluation of microhardness and water sorption/solubility of dual-cure resin cement through monolithic zirconia in different shades. J Indian Prosthodont Soc 2021; 21:50-56. [PMID: 33835068 PMCID: PMC8061437 DOI: 10.4103/jips.jips_284_20] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Aim: The objective is to evaluate the effect of shades of monolithic zirconia on the microhardness and sorption/solubility of the underlying two dual-cured resin types of cement. Materials and Methods: Eighty samples of two dual-cured resin cement discs were polymerized under 60 monolithic zirconia discs in three shades and directly activated resin discs of cement were used as the control group (n = 10). After 24 h storage at 37°C in an incubator, Vickers microhardness and the sorption and solubility were measured. Statistical Analysis Used: Two-way ANOVA , one-way ANOVA, Independent t-test, Tukey's honestly significant difference, and Tamhane's T2 tests. Results: The mean microhardness of the Variolink N resin cements were significantly higher than Panavia SA ones (P < 0.001). Furthermore, Variolink N cements exhibited lower sorption/solubility than Panavia SA resin cements (both P < 0.05). The ceramic shade had a significant influence on the microhardness of both cements (P < 0.001) but had no significant effect on the sorption/solubility of resin cements (P > 0.05). Conclusion: Interposition of monolithic zirconia decreases the microhardness of resin cement especially Panavia SA. In Variolink N, by increasing the chroma saturation of ceramics, the microhardness decreased, however in Panavia SA, it was altered by the shades, but not in a specific pattern. For both cements, there were no statistical differences between the sorption/solubility of samples photo-cured under different shades. There was a reverse correlation between microhardness and water sorption/solubility of both cements.
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Affiliation(s)
- Elham Ansarifard
- Department of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Zahra Panbehzan
- Department of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Rashin Giti
- Department of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran
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Borges MHR, Dias CGT, Alencar CDM, Silva CM, Esteves RA. Evaluation of physical-mechanical properties of self-adhesive versus conventional resin cements. BRAZILIAN JOURNAL OF ORAL SCIENCES 2020. [DOI: 10.20396/bjos.v19i0.8658204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Aim: The purpose of this study was to compare the microhardness, diametral tensile strength, compressive strength and the rheological properties of self-adhesive versus conventional resin cements. Methods: Specimens of a conventional (RelyX ARC) and 3 self-adhesive (RelyX U200, Maxcem Elite, Bifix SE) types of resin cements were prepared. The Knoop test was used to assess the microhardness, using a Microhardness Tester FM 700. For the diametral tensile strength test, a tensile strength was applied at a speed of 0.6 mm/minute. A universal testing machine was used for the analysis of compressive strength and a thermo-controlled oscillating rheometer was used for the Rheology test. One-way ANOVA and Tukey’s test (α=0.05) were used for data analysis. Results: According to microhardness analysis, all the cements were statistically similar (p>0.05), except for Maxcem that presented lower hardness compared with the other cements in relation to the top surface (p<0.05). In the diametral tensile strength test, Relyx U200 and RelyX ARC cements were statistically similar (p>0.05), presented higher value when compared to the Maxcem and Bifix cements (p<0.05). The compressive strength of RelyX ARC and Maxcem Elite cements was statistically higher than RelyX U200 and Bifix cements (p<0.05). Regarding the rheology test, Maxcem Elite and RelyX ARC cements showed a high modulus of elasticity. Conclusions: The self-adhesive cements presented poorer mechanical properties than conventional resin cement. Chemical structure and types of monomers employed interfere directly in the mechanical properties of resin cements.
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Paes PNG, Miranda MSD, Sampaio-Filho HR, Correr-Sobrinho L. Influence of activation mode, fatigue, and ceramic interposition on resin cements' diametral tensile strength. Braz Oral Res 2019; 33:e083. [PMID: 31460609 DOI: 10.1590/1807-3107bor-2019.vol33.0083] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Accepted: 07/02/2019] [Indexed: 11/22/2022] Open
Abstract
This study evaluated the influence of activation modes, on Diametral Tensile Strength (DTS) of dual cured resin cements subjected to a Mechanical Fatigue test (MF). Four dual-cured resin cements (RelyX UNICEM [U], RelyX ARC [A], ENFORCE [E] and Nexus 2 [N]) were activated by three different curing modes as follows: Self-Curing (SC), Dual Cure activation with photoactivation executed directly (DC) and Dual Cure activation with Photoactivation Through Porcelain (DCTP). After 24 hours, half of the sample was subjected to 30.000 fatigue cycles at 1 Hz frequency and 12 N load. Then, all specimens were subjected to DTS test in Instron Universal Testing Machine and data were analyzed by three-way ANOVA and Tukey's Test (5%). The results of DTS test means (MPa) and standard deviation, for each cement factor activated by SC, DC and DCTP was respectively: U (28.12 ± 5.29; 37.44 ± 6.49 and 40.10 ± 4.39), A (49.68 ± 8.42; 55.12 ± 5.16 and 63.43 ± 6.92), E (49.12 ± 3.89; 56.42 ± 8.88 and 56.96 ± 6.45) and N (61.89 ± 11.21; 59.26 ± 9.47 and 62.56 ± 10.93). Turkey's test indicated that DC is related to the highest DTS values; Nexus 2 DTS remained the same independently of activation mode and that the Porcelain disk interposition enhanced DTS only for RelyX ARC the ANOVA statistical test indicated that MF didn't alter the DTS values for all experimental groups. MF results clinical implication is that all cements tested exhibited, in an immediate loading, good cross linked bonds quality.
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Affiliation(s)
- Paula Nunes Guimarães Paes
- Universidade do Estado do Rio de Janeiro - UERJ, Faculty of Dentistry, Department of Dentistry, Rio de Janeiro, RJ, Brazil
| | - Mauro Sayão de Miranda
- Universidade do Estado do Rio de Janeiro - UERJ, Faculty of Dentistry, Department of Dentistry, Rio de Janeiro, RJ, Brazil
| | - Hélio Rodrigues Sampaio-Filho
- Universidade do Estado do Rio de Janeiro - UERJ,, Faculty of Dentistry, Department of Prosthodontics, Rio de Janeiro, RJ, Brazil
| | - Lourenço Correr-Sobrinho
- Universidade Estadual de Campinas - Unicamp, Piracicaba School of Dentistry, Department of Restorative Dentistry, Piracicaba, SP, Brazil
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Szczesio-Wlodarczyk A, Rams K, Kopacz K, Sokolowski J, Bociong K. The Influence of Aging in Solvents on Dental Cements Hardness and Diametral Tensile Strength. MATERIALS (BASEL, SWITZERLAND) 2019; 12:E2464. [PMID: 31382428 PMCID: PMC6695766 DOI: 10.3390/ma12152464] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Revised: 07/29/2019] [Accepted: 07/31/2019] [Indexed: 11/21/2022]
Abstract
Prosthetic materials must exhibit adequate resistance to the oral environment. The aim of this paper was to study the resistance of selected cements used for cementing restorations (Breeze-composite, Adhesor Carbofine-zinc-polycarboxylate and IHDENT-Giz type II-glass-ionomer) against ethanol, soda and green tea solutions. The highest values of hardness and DTS (diametral tensile strength) were obtained by composite cement (HV = 15-31, DTS = 34-45 MPa). Ethanol solution had the greatest impact on the hardness value of composite cement, and soda solution on zinc-polycarboxylate cement. No significant differences were noted in the DTS values of composite cements after immersion in solvents; however, the DTS value of zinc-polycarboxylate cement increased after prolonged immersion time in ethanol and the DTS of glass-ionomer cement (IHDENT Giz type II) clearly decreased after submersion in soda solutions. Variation in pH across the range of 6 (tea) to 9 (soda solution) had a low impact on the properties of dental cements. Extended exposure to solvents appears to worsen the properties of cements.
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Affiliation(s)
- Agata Szczesio-Wlodarczyk
- University Laboratory of Materials Research, Medical University of Lodz, ul Pomorska 251, 92-213 Lodz, Poland.
| | - Karolina Rams
- Department of General Dentistry, Medical University of Lodz, ul, Pomorska 251, 92-213 Lodz, Poland
| | - Karolina Kopacz
- "DynamoLab" Academic Laboratory of Movement and Human Physical Performance, Medical University of Lodz, ul. Pomorska 251, 92-216 Lodz, Poland
| | - Jerzy Sokolowski
- Department of General Dentistry, Medical University of Lodz, ul, Pomorska 251, 92-213 Lodz, Poland
| | - Kinga Bociong
- University Laboratory of Materials Research, Medical University of Lodz, ul Pomorska 251, 92-213 Lodz, Poland
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Rohr N, Müller JA, Fischer J. Influence of Ambient Temperature and Light-curing Moment on Polymerization Shrinkage and Strength of Resin Composite Cements. Oper Dent 2018; 43:619-630. [DOI: 10.2341/17-085-l] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
ABSTRACT
Objective:
The purpose of this study was to establish a clinically appropriate light-curing moment for resin composite cements while achieving the highest indirect tensile strength and lowest polymerization shrinkage.
Methods and Materials:
Polymerization shrinkage of seven resin composite cements (Multilink Automix, Multilink Speed Cem, RelyX Ultimate, RelyX Unicem 2 Automix, Panavia V5, Panavia SA plus, VITA Adiva F-Cem) was measured at ambient temperatures of 23°C and 37°C. Testing was done for autopolymerized and light-cured specimens after light application at either 1, 5, or 10 minutes after mixing. Indirect tensile strength of all cements was measured after 24 hours of storage at temperatures of 23°C and 37°C, for autopolymerized and light-cured specimens after light application 1, 5, or 10 minutes after mixing. To illustrate filler size and microstructures, SEM images of all cements were captured. Statistical analysis was performed with one-way ANOVA followed by post hoc Fisher LSD test (α=0.05).
Results:
Final polymerization shrinkage of the resin composite cements ranged from 3.2% to 7.0%. An increase in temperature from 23°C to 37°C as well as the light-curing moment resulted in material dependent effects on the polymerization shrinkage and indirect tensile strength of the cements. Polymerization shrinkage of the cements did not correlate with the indirect tensile strength of the cement in the respective groups. Highest indirect tensile strengths were observed for the materials containing a homogeneous distribution of fillers with a size of about 1 μm (Multilink Automix, Panavia V5, VITA Adiva F-Cem).
Conclusion:
The magnitude of the effect of light-curing moment and temperature increase on polymerization shrinkage and indirect tensile strength of resin composite cements is material dependent and cannot be generalized.
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Affiliation(s)
- N Rohr
- Nadja Rohr, Dr med dent, University Center for Dental Medicine Basel, Division of Dental Materials and Engineering, Department of Reconstructive Dentistry, Basel, Switzerland
| | - JA Müller
- Johannes A Müller, Dr med dent, University Center for Dental Medicine, Department of Reconstructive Dentistry, Basel, Switzerland
| | - J Fischer
- Jens Fischer, Prof Dr med dent, Dr rer nat, University Center for Dental Medicine, Division of Dental Materials and Engineering, Department of Reconstructive Dentistry, Basel, Switzerland
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Rohr N, Fischer J. Effect of aging and curing mode on the compressive and indirect tensile strength of resin composite cements. Head Face Med 2017; 13:22. [PMID: 29162139 PMCID: PMC5697404 DOI: 10.1186/s13005-017-0155-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Accepted: 11/15/2017] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Resin composite cements are used in dentistry to bond ceramic restorations to the tooth structure. In the oral cavity these cements are subjected to aging induced by masticatory and thermal stresses. Thermal cycling between 5 and 55 °C simulates the effect of varying temperatures in vitro. Purpose of this study was to compare indirect tensile to compressive strength of different cements before and after thermal cycling. The effect of the curing mode was additionally assessed. METHODS Indirect tensile strength and compressive strength of 7 dual-curing resin composite cements (Multilink Automix, Multilink SpeedCem, RelyX Ultimate, RelyX Unicem 2 Automix, Panavia V5, Panavia SA Plus, Harvard Implant semi-permanent) was measured. The specimens were either autopolymerized or light-cured (n = 10). The mechanical properties were assessed after 24 h water storage at 37 °C and after aging (20,000 thermo cycles) with previous 24 h water storage at 37 °C. RESULTS Indirect tensile strength ranged from 5.2 ± 0.8 to 55.3 ± 4.2 MPa, compressive strength from 35.8 ± 1.8 MPa to 343.8 ± 19.6 MPa. CONCLUSIONS Thermocyclic aging of 20,000 cycles can be considered a suitable method to simulate the degradation of indirect tensile strength but not compressive strength of resin composite cements. The effect of thermocycling and the curing mode on the resin composite cements is material dependent and cannot be generalized.
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Affiliation(s)
- Nadja Rohr
- Division of Materials Science and Engineering, Clinic for Reconstructive Dentistry and Temporomandibular Disorders, University Center for Dental Medicine, Hebelstrasse 3, CH-4056, Basel, Switzerland.
| | - Jens Fischer
- Division of Materials Science and Engineering, Clinic for Reconstructive Dentistry and Temporomandibular Disorders, University Center for Dental Medicine, Hebelstrasse 3, CH-4056, Basel, Switzerland
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Kadowaki Y, Kakuda S, Kawano S, Katsumata A, Ting S, Hoshika S, Ikeda T, Tanaka T, Carvalho RM, Sano H. Bond performance of "Touch and Cure" adhesives on resin core systems. Dent Mater J 2017; 35:386-91. [PMID: 27251993 DOI: 10.4012/dmj.2015-330] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The purpose of this study was to compare the micro-tensile bond strength (µTBS) of three resin core composites to dentin and to examine the bonded interface of the composites. One experimental TDK-03(TD) and, two commercial, DC core Automix One (DC) and Unifil core EM(UN) were used. Flat dentin surfaces of human molars were exposed using #600 SiC paper and bonded with the respective adhesive of each system. After bonding, the composites were built up on the surfaces and cured under two conditions: "light condition" or "dark condition". µTBSs (MPa) in the light condition were: TD; 60.02±17.08, DC; 38.21±13.70, and UN; 29.50±9.71; in the dark condition: TD; 54.62±17.11, DC; 8.40±4.81, and UN; 9.47±6.56. Dark curing negatively affected the bond strength of the two commercial resin-core materials. The experimental material was not affected by the curing conditions.
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Affiliation(s)
- Yoshitaka Kadowaki
- Department of Restorative Dentistry, Division of Oral Health Science, Graduate School of Dental Medicine, Hokkaido University
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Kim AR, Jeon YC, Jeong CM, Yun MJ, Choi JW, Kwon YH, Huh JB. Effect of activation modes on the compressive strength, diametral tensile strength and microhardness of dual-cured self-adhesive resin cements. Dent Mater J 2017; 35:298-308. [PMID: 27041021 DOI: 10.4012/dmj.2015-056] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The purpose of this study was to compare the compressive strength, diametral tensile strength and microhardnss of several selfadhesive resin cements (Rely-X U200, Clearfill SA Luting, G-CEM LinkAce, Maxcem Elite, PermaCem 2.0, and Zirconite) using different activation modes (self-cured, light-cured) and testing time (immediately, 24 h, thermocycling). Specimens were prepared for the compressive strength (Ø 4×6 mm) and diametral tensile strength and microhardness (Ø 6×3 mm) according to ISO standards. The strength after 24 h was higher than immediately after. In addition, G-CEM showed the highest values. In terms of the activation modes, Rely-X U200, PermaCem 2.0 had higher values in the light-curing than the self-curing. In conclusion, all cements demonstrated clinically available strength values and revealed differences in strength according to their composition, testing time and activation mode. Furthermore, correlation was found between the microhardness (degree of conversion) and mechanical strengths of the cements tested.
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Affiliation(s)
- Ah-Rang Kim
- Department of Prosthodontics, Dental Research Institute, Institute of Translation Dental Science, School of Dentistry, Pusan National University
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Blumer L, Schmidli F, Weiger R, Fischer J. A systematic approach to standardize artificial aging of resin composite cements. Dent Mater 2015; 31:855-63. [DOI: 10.1016/j.dental.2015.04.015] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2015] [Revised: 03/20/2015] [Accepted: 04/27/2015] [Indexed: 10/24/2022]
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KAWANO S, FU J, SAIKAEW P, CHOWDHURY AFMA, FUKUZAWA N, KADOWAKI Y, KAKUDA S, HOSHIKA S, NAKAOKI Y, IKEDA T, TANAKA T, SANO H. Microtensile bond strength of a newly developed resin cement to dentin. Dent Mater J 2015; 34:61-9. [DOI: 10.4012/dmj.2014-122] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Shimpei KAWANO
- Department of Restorative Dentistry, Division of Oral Health Science, Hokkaido University Graduate School of Dental Medicine
| | - Jiale FU
- Department of Restorative Dentistry, Division of Oral Health Science, Hokkaido University Graduate School of Dental Medicine
| | - Pipop SAIKAEW
- Department of Restorative Dentistry, Division of Oral Health Science, Hokkaido University Graduate School of Dental Medicine
| | - AFM Almas CHOWDHURY
- Department of Restorative Dentistry, Division of Oral Health Science, Hokkaido University Graduate School of Dental Medicine
| | - Naoyuki FUKUZAWA
- Department of Restorative Dentistry, Division of Oral Health Science, Hokkaido University Graduate School of Dental Medicine
| | - Yoshitaka KADOWAKI
- Department of Restorative Dentistry, Division of Oral Health Science, Hokkaido University Graduate School of Dental Medicine
| | - Shinichi KAKUDA
- Department of Restorative Dentistry, Division of Oral Health Science, Hokkaido University Graduate School of Dental Medicine
| | - Shuhei HOSHIKA
- Department of Restorative Dentistry, Division of Oral Health Science, Hokkaido University Graduate School of Dental Medicine
| | - Yasuko NAKAOKI
- Department of Restorative Dentistry, Division of Oral Health Science, Hokkaido University Graduate School of Dental Medicine
| | - Takatsumi IKEDA
- Department of Restorative Dentistry, Division of Oral Health Science, Hokkaido University Graduate School of Dental Medicine
| | - Toru TANAKA
- Department of Restorative Dentistry, Division of Oral Health Science, Hokkaido University Graduate School of Dental Medicine
| | - Hidehiko SANO
- Department of Restorative Dentistry, Division of Oral Health Science, Hokkaido University Graduate School of Dental Medicine
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Dejak B, Młotkowski A. A comparison of stresses in molar teeth restored with inlays and direct restorations, including polymerization shrinkage of composite resin and tooth loading during mastication. Dent Mater 2014; 31:e77-87. [PMID: 25544104 DOI: 10.1016/j.dental.2014.11.016] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Revised: 06/11/2014] [Accepted: 11/26/2014] [Indexed: 11/17/2022]
Abstract
UNLABELLED Polymerization shrinkage of composites is one of the main causes of leakage around dental restorations. Despite the large numbers of studies there is no consensus, what kind of teeth reconstruction--direct or indirect composite restorations are the most beneficial and the most durable. OBJECTIVE The aim was to compare equivalent stresses and contact adhesive stresses in molar teeth with class II MOD cavities, which were restored with inlays and direct restorations (taking into account polymerization shrinkage of composite resin) during simulated mastication. METHOD The study was conducted using the finite elements method with the application of contact elements. Three 3D models of first molars were created: model A was an intact tooth; model B--a tooth with a composite inlay, and model C--a tooth with a direct composite restoration. Polymerization linear shrinkage 0.7% of a direct composite restoration and resin luting cement was simulated (load 1). A computer simulation of mastication was performed (load 2). In these 2 situations, equivalent stresses according to the modified von Mises criterion (mvM) in the materials of mandibular first molar models with different restorations were calculated and compared. Contact stresses in the luting cement-tooth tissue adhesive interface around the restorations were also assessed and analyzed. RESULTS Equivalent stresses in a tooth with a direct composite restoration (the entire volume of which was affected by polymerization shrinkage) were many times higher than in the tooth restored with a composite inlay (where shrinkage was present only in a thin layer of the luting cement). In dentin and enamel the stress values were 8-14 times higher, and were 13 times higher in the direct restoration than in the inlay. Likewise, contact stresses in the adhesive bond around the direct restoration were 6.5-7.7 times higher compared to an extraorally cured restoration. In the masticatory simulation, shear contact stresses in the adhesive bond around the direct composite restoration reached the highest values 32.8 MPa and significantly exceeded the shear strength of the connection between the resin luting cement and the tooth structure. SIGNIFICANCE Equivalent stresses in the tooth structures restored with inlays and in the restoration material itself and contact stresses at the tooth-luting cement adhesive interface are many times lower compared to teeth with direct composite restorations. Teeth with indirect restorations are potentially less susceptible to damage compared to those with direct restorations. Composite inlays also ensure a better seal compared to direct restorations. Polymerization shrinkage determines stress levels in teeth with direct restorations, while its impact on adhesion in indirectly restored teeth is insignificant.
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Affiliation(s)
- Beata Dejak
- Department of Prosthetic Dentistry, Medical University of Łódź, Łódź, Poland.
| | - Andrzej Młotkowski
- Department of Strength of Materials and Structures, Technical University of Łódź, Łódź, Poland
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Furtos G, Tomoaia-Cotisel M, Prejmerean C. Resin Composites Reinforced by Glass Fibers with Potential Biomedical Applications. Structure and Mechanical Properties. PARTICULATE SCIENCE AND TECHNOLOGY 2013. [DOI: 10.1080/02726351.2012.736458] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Jongsma LA, de Jager N, Kleverlaan CJ, Pallav P, Feilzer AJ. Shear bond strength of three dual-cured resin cements to dentin analyzed by finite element analysis. Dent Mater 2012; 28:1080-8. [DOI: 10.1016/j.dental.2012.07.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2012] [Revised: 07/05/2012] [Accepted: 07/05/2012] [Indexed: 10/28/2022]
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14
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Furtos G, Tomoaia-Cotisel M, Baldea B, Prejmerean C. Development and characterization of new AR glass fiber-reinforced cements with potential medical applications. J Appl Polym Sci 2012. [DOI: 10.1002/app.38508] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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15
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Morais A, Santos ARAD, Giannini M, Reis AF, Rodrigues JA, Arrais CAG. Effect of pre-heated dual-cured resin cements on the bond strength of indirect restorations to dentin. Braz Oral Res 2012; 26:170-6. [PMID: 22473354 DOI: 10.1590/s1806-83242012000200014] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2011] [Accepted: 01/04/2012] [Indexed: 11/21/2022] Open
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Cekic-Nagas I, Ergun G. Effect of different light curing methods on mechanical and physical properties of resin-cements polymerized through ceramic discs. J Appl Oral Sci 2011; 19:403-12. [PMID: 21710093 PMCID: PMC4223794 DOI: 10.1590/s1678-77572011005000017] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2009] [Accepted: 10/26/2010] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVE The aim of this study was to compare the polimerization ability of three different light-curing units (quartz tungsten halogen, light-emitting diodes and plasma arc) and their exposure modes (high-intensity and soft-start) by determination of microhardness, water sorption and solubility, and diametral tensile strength of 5 dual-curing resin cements. MATERIAL AND METHODS A total of 720 disc-shaped samples (1 mm height and 5 mm diameter) were prepared from different dual-curing resin cements (Duolink, Nexus, Bifix-QM, Panavia F and RelyX Unicem). Photoactivation was performed by using quartz tungsten halogen (high-power and soft-up modes), light-emitting diode (standard and exponential modes) and plasma arc (normal and ramp-curing modes) curing units through ceramic discs. Then the samples (n=8/per group) were stored dry in the dark at 37°C for 24 h. The Vickers hardness test was performed on the resin cement layer with a microhardness tester (Shimadzu HMV). For sorption and solubility tests; the samples were stored in a desiccator at 37°C and weighed to a constant mass. The samples were weighed both before and after being immersed in deionized water for different periods of time (24 h and 7 days) and being desiccated. The diametral tensile strength of the samples was tested in a universal testing machine at a crosshead speed of 0.5 mm/min. Data were analyzed statistically by nonparametric Kruskal Wallis and Mann-Whitney U tests at 5% significance level. RESULTS Resin cement and light-curing unit had significant effects (p<0.05) on microhardness, diametral tensile strength, water solubility and sorption. However, no significant differences (p>0.05) were obtained with different modes of LCUs. CONCLUSION The study indicates that polymerization of resin cements with different light-curing units may result in various polymer structures, and consequently different mechanical and physical properties.
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Affiliation(s)
- Isil Cekic-Nagas
- Department of Prosthodontics, Faculty of Dentistry, Gazi University, Ankara, Turkey.
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Bueno ALN, Arrais CAG, Jorge ACT, Reis AF, Amaral CM. Light-activation through indirect ceramic restorations: does the overexposure compensate for the attenuation in light intensity during resin cement polymerization? J Appl Oral Sci 2011; 19:22-7. [PMID: 21437465 PMCID: PMC4245859 DOI: 10.1590/s1678-77572011000100006] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2009] [Accepted: 02/16/2010] [Indexed: 11/22/2022] Open
Abstract
Objectives This study evaluated the effects of light exposure through simulated indirect
ceramic restorations (SICR) on hardness (KHN) of dual-cured resin cements (RCs),
immediately after light-activation and 24 h later. Material and Methods Three dual-cured RCs were evaluated: eco-Link (Ivoclar Vivadent), Rely X ARC (3M
eSPe), and Panavia F (Kuraray Medical Inc.). The RCs were manipulated in
accordance to the manufacturers’ instructions and were placed into cylindrical
acrylic matrixes (1-mm-thick and 4-mm diameter). The RC light-activation (Optilux
501; Demetron Kerr) was performed through a glass slide for 120 s (control group),
or through 2-mm or 4-mm thick SICRs (IPS empress II; Ivoclar Vivadent). The
specimens were submitted to KHN analysis immediately and 24 h after
light-activation. The data obtained at the 2 evaluation intervals were submitted
to 2-way ANOVA repeated measures and post-hoc Tukey’s test
(pre-set alpha of 5%). Results Lower KHN was observed when light-activation was performed through SICRs for
eco-Link at all evaluation intervals and for Rely X ARC 24 h later. For Panavia F,
no significant difference in KHN was observed between control and experimental
groups, regardless of evaluation interval. Most groups exhibited higher KHN after
24 h than immediately after light-activation, with the exception of Rely X ARC
light-activated through SICR, as no significant difference in KHN was found
between evaluation intervals. Conclusion Light overexposure did not compensate for light intensity attenuation due to the
presence of SICR when Rely X and eco-Link were used. Although hardness of such RCs
increased over a 24-h interval, the RCs subjected to light overexposure did not
reach the hardness values exhibited after direct light exposure.
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Brandt WC, Schneider LFJ, Frollini E, Correr-Sobrinho L, Sinhoreti MAC. Effect of different photo-initiators and light curing units on degree of conversion of composites. Braz Oral Res 2010; 24:263-70. [DOI: 10.1590/s1806-83242010000300002] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2010] [Accepted: 05/17/2010] [Indexed: 11/22/2022] Open
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Pereira SG, Fulgêncio R, Nunes TG, Toledano M, Osorio R, Carvalho RM. Effect of curing protocol on the polymerization of dual-cured resin cements. Dent Mater 2010; 26:710-8. [DOI: 10.1016/j.dental.2010.03.016] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2009] [Revised: 12/15/2009] [Accepted: 03/09/2010] [Indexed: 10/19/2022]
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Arrais CAG, Giannini M, Rueggeberg FA. Kinetic analysis of monomer conversion in auto- and dual-polymerizing modes of commercial resin luting cements. J Prosthet Dent 2009; 101:128-36. [PMID: 19167537 DOI: 10.1016/s0022-3913(09)60008-1] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Cesar A G Arrais
- Department of Operative Dentistry, School of Dentistry, University of Guarulhos, Guarulhos, São Paulo, Brazil.
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KONO T, YOSHINARI M, TAKEMOTO S, HATTORI M, KAWADA E, ODA Y. Mechanical properties of roots combined with prefabricated fiber post. Dent Mater J 2009; 28:537-43. [DOI: 10.4012/dmj.28.537] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Camilotti V, Grullón PG, Mendonça MJ, D'Alpino PHP, Gomes JC. Influence of different light curing units on the bond strength of indirect resin composite restorations. Braz Oral Res 2008; 22:164-9. [DOI: 10.1590/s1806-83242008000200012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2006] [Accepted: 06/19/2007] [Indexed: 11/22/2022] Open
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