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Nazemisalman B, Niaz S, Darvish S, Notash A, Ramazani A, Luchian I. The Antibacterial Properties of a Reinforced Zinc Oxide Eugenol Combined with Cloisite 5A Nanoclay: An In-Vitro Study. J Funct Biomater 2024; 15:198. [PMID: 39057319 PMCID: PMC11278227 DOI: 10.3390/jfb15070198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2024] [Revised: 07/16/2024] [Accepted: 07/18/2024] [Indexed: 07/28/2024] Open
Abstract
Pulpotomies and pulpectomies are the most common clinical approach for dental caries in the primary dentition. Reinforced zinc oxide eugenol (ZOE) is an ideal material for filling in the pulp chamber after pulp therapies. The aim of this study was to assess the addition of Cloisite 5A nanoclay material to ZOE and evaluate its antibacterial properties. In this case-control study, the nanoclay nanoparticles were dissolved using a solvent (Eugenol) in different concentrations and their antibacterial properties were assessed using the agar diffusion test and biofilm analysis of Streptococcus mutans (S. mutans), Enterococcus faecalis (E. faecalis), and Escherichia coli (E. coli) in in vitro conditions using the AATCC 100 standards. The diameter of the inhibition zone was measured and assessed statistically using the SPSS software (Version 28, IBM, Chicago, IL, USA) with a significance level of 0.05. The antibacterial properties of the ZOE with nanoclay particles were significantly greater in comparison to the plain ZOE against E. faecalis, S. mutans, and E. coli. The inhibition zone against E. coli under the effect of the ZOE and nanoclay particles combined was significantly higher than that against E. faecalis and S. mutans. The current study showed that the addition of Cloisite 5A nanoclay particles can improve the antibacterial properties of ZOE significantly at certain concentrations.
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Affiliation(s)
- Bahareh Nazemisalman
- Department of Pediatric Dentistry, School of Dentistry, Zanjan University of Medical Sciences, Zanjan 4513956184, Iran;
| | | | - Shayan Darvish
- School of Dentistry, University of Michigan, Ann Arbor, MI 48104, USA
| | - Ayda Notash
- Independent Researcher, Tabriz 5178654714, Iran;
| | - Ali Ramazani
- Department of Pharmaceutical Biotechnology, School of Pharmacy, Zanjan University of Medical Sciences, Zanjan 4513956184, Iran
| | - Ionut Luchian
- Department of Periodontology, Faculty of Dental Medicine, “Grigore T. Popa” University of Medicine and Pharmacy, 700115 Iasi, Romania;
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Alagha EI. Effect of Different Bonding Techniques on Marginal Adaptation of Harmonize Composite Resin at Different Storage Times. JOURNAL OF PHARMACY AND BIOALLIED SCIENCES 2021; 13:S586-S589. [PMID: 34447158 PMCID: PMC8375947 DOI: 10.4103/jpbs.jpbs_564_20] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 10/30/2020] [Accepted: 11/18/2020] [Indexed: 12/04/2022] Open
Abstract
Aim: The aim of this study is to evaluate the outcome of diverse bonding methods on marginal adaptation of harmonize composite at altered times of storage. Materials and Methods: The study was done on 120 upper premolars with two adhesive systems (n = 60), self-etch, and total-etch type. Sixty teeth of each method were stored at three different times (n = 20) 1 day, 3, and 6 months. Class II cavities were made in all teeth restored with Harmonize composite incrementally. Then, each tooth was sectioned into two halves in buccolingual direction and observed with stereomicroscope for detecting any gaps and scanning electron microscope to assess resin-dentin junction. Results: Mean gap area was more in the self-etch group at the cervical and occlusal margins. Storage period of 6 months revealed significantly highest mean gap area. Conclusions: Total-etch system showed better marginal adaptation than the self-etch system and storage of resin in water has unfavorable marginal adaptation.
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Affiliation(s)
- Ebaa Ibrahim Alagha
- Department of Restorative Dentistry, Faculty of Dentistry, Al-Farabi Private Colleges, Jeddah, Saudi Arabia
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da Cruz LBT, Oliveira MT, Saraceni CHC, Lima AF. The influence of nanofillers on the properties of ethanol-solvated and non-solvated dental adhesives. Restor Dent Endod 2019; 44:e28. [PMID: 31485424 PMCID: PMC6713076 DOI: 10.5395/rde.2019.44.e28] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Revised: 05/16/2019] [Accepted: 06/30/2019] [Indexed: 11/11/2022] Open
Abstract
Objectives The aim of this study was to evaluate the influence of different concentrations of nanofillers on the chemical and physical properties of ethanol-solvated and non-solvated dental adhesives. Materials and Methods Eight experimental adhesives were prepared with different nanofiller concentrations (0, 1, 2, and 4 wt%) and 2 solvent concentrations (0% and 10% ethanol). Several properties of the experimental adhesives were evaluated, such as water sorption and solubility (n = 5, 20 seconds light activation), real-time degree of conversion (DC; n = 3, 20 and 40 seconds light activation), and stability of cohesive strength at 6 months (CS; n = 20, 20 seconds light activation) using the microtensile test. A light-emitting diode (Bluephase 20i, Ivoclar Vivadent) with an average light emittance of 1,200 mW/cm2 was used. Results The presence of solvent reduced the DC after 20 seconds of curing, but increased the final DC, water sorption, and solubility of the adhesives. Storage in water reduced the strength of the adhesives. The addition of 1 wt% and 2 wt% nanofillers increased the polymerization rate of the adhesives. Conclusions The presence of nanofillers and ethanol improved the final DC, although the DC of the solvated adhesives at 20 seconds was lower than that of the non-solvated adhesives. The presence of ethanol reduced the strength of the adhesives and increased their water sorption and solubility. However, nanofillers did not affect the water sorption and strength of the tested adhesives.
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Affiliation(s)
| | | | | | - Adriano Fonseca Lima
- Dental Research Division, School of Dentistry, Paulista University, Sao Paulo, Brazil
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Barzegar A, Ghaffari T. Nanoclay-reinforced polymethylmethacrylate and its mechanical properties. Dent Res J (Isfahan) 2018; 15:295-301. [PMID: 30123308 PMCID: PMC6073944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND Incorporation of extra fillers into dental resins might enhance their physical properties. In this study, the tensile and impact strengths of modified heat-curing acrylic resin reinforced with nanoclay were investigated. MATERIALS AND METHODS In this experimental study, nanoclay-acrylic resin composite was prepared by mixing 0.5, 1, and 2 wt% of nanoclay with methacrylate monomer in an ultrasonic probe, followed by mixing with the polymethylmethacrylate (PMMA) powder. 24 cubic 20 mm × 20 mm × 200-mm specimens for each test, 18 samples containing nanoclay and 6 samples for the control group and a total of 48 samples were prepared. The tensile and impact strengths of the samples were tested according to ISO 527 and 179, respectively. One-way ANOVA was used for statistical analysis, followed by multiple comparison tests (Scheffé's test). Statistical significance was set at P < 0.05. RESULTS The maximum mean tensile and impact strengths were recorded in the control group, and an acrylic resin containing 2% of nanoclay demonstrated the minimum mean in all the tests. Increasing the percentage of nanoclay in PMMA compromised the tensile strength (P < 0.05) with no effect on its impact strength. CONCLUSION Incorporation of nanoclay particles into acrylic resins can adversely affect the mechanical properties of the final products, and this effect is directly correlated with the concentration of nanoparticles.
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Affiliation(s)
- Ali Barzegar
- Dental and Periodontal Research Center, Tabriz University of Medical Sciences, Tabriz, Iran,Assistant professor, Department of Prosthodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Tahereh Ghaffari
- Dental and Periodontal Research Center, Tabriz University of Medical Sciences, Tabriz, Iran,Associate professor, Department of Prosthodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran,Address for correspondence: Dr. Tahereh Ghaffari, Department of Prosthodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Golgasht Avenue, Tabriz, Iran. E-mail:
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Mishra P, Jaiswal S, Nikhil V, Gupta S, Jha P, Raj S. Evaluation of marginal sealing ability of self-adhesive flowable composite resin in Class II composite restoration: An in vitro study. J Conserv Dent 2018; 21:363-368. [PMID: 30122814 PMCID: PMC6080182 DOI: 10.4103/jcd.jcd_94_18] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Aim: The aim of this study is to evaluate the marginal sealing ability of self-adhesive flowable composite resin when used as a liner in Class II composite restoration with and without aging. Materials and Methods: A total of 120 standardized Class II tooth preparations with gingival margins 1 mm coronal and apical to cementenamel junction (CEJ) were prepared on 60 extracted permanent mandibular molars and were randomly divided into eight equal Groups: Group 1: cavities coronal to CEJ and restored with Dyad flow liner + Herculite ultra, Group 2: same as Group 1 but cavities margins apical to CEJ, Group 5: cavities coronal to CEJ and restored with only Herculite ultra, and Group 6: same as Group 5 but cavities apical to CEJ. Groups 3,4,7,8 were similar to Groups 1,2,5,6, respectively, but were aged for 6 months. After thermocycling, microleakage testing was done using 0.5% basic fuchsin dye. Result: At cervical level, Group 5 exhibited statistically lower (P = 0.006) microleakage than Group 6, and Group 1 showed lesser microleakage than Group 5 (P = 0.162). Group 2 exhibited significantly less microleakage than Group 6 (P = 0.002). Increased microleakage was observed in aging Groups; however, the difference with nonaging Groups was not statistically significant (P > 0.005). Conclusion: Margins of the cavity in cementum can be better sealed by placing self-adhesive liner and is not affected by aging.
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Affiliation(s)
- Preeti Mishra
- Department of Conservative Dentistry and Endodontics, Subharti Dental College, Meerut, Uttar Pradesh, India
| | - Shikha Jaiswal
- Department of Conservative Dentistry and Endodontics, Subharti Dental College, Meerut, Uttar Pradesh, India
| | - Vineeta Nikhil
- Department of Conservative Dentistry and Endodontics, Subharti Dental College, Meerut, Uttar Pradesh, India
| | - Sachin Gupta
- Department of Conservative Dentistry and Endodontics, Subharti Dental College, Meerut, Uttar Pradesh, India
| | - Padmanabh Jha
- Department of Conservative Dentistry and Endodontics, Subharti Dental College, Meerut, Uttar Pradesh, India
| | - Shalya Raj
- Department of Conservative Dentistry and Endodontics, Subharti Dental College, Meerut, Uttar Pradesh, India
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Gupta A, Tavane P, Gupta PK, Tejolatha B, Lakhani AA, Tiwari R, Kashyap S, Garg G. Evaluation of Microleakage with Total Etch, Self Etch and Universal Adhesive Systems in Class V Restorations: An In vitro Study. J Clin Diagn Res 2017; 11:ZC53-ZC56. [PMID: 28571262 DOI: 10.7860/jcdr/2017/24907.9680] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Accepted: 01/26/2017] [Indexed: 11/24/2022]
Abstract
INTRODUCTION Adhesive dentistry is overwhelmingly evolving with respect to the dental surgeon's and patient's perspective. Embracing the concept of minimally invasive dentistry which follows minimum intervention performed to produce good adhesion and tooth coloured restoration, in turn makes the newer generation bonding agents more acceptable and appropriate withstanding the demand for stable restoration. AIM To study and compare the extent of microleakage between tooth and restoration interface in class V composite resin restorations applying one Total Etch (AdperTM single bond), two Self Etch (AdperTM SE Plus, AdperTM Easy One) and Universal bonding agents using dye penetration method. MATERIALS AND METHODS A total of 120 freshly orthodontically extracted human maxillary and mandibular premolars were included in the study. Class V cavities were prepared with a cylindrical diamond bur on the facial surface of each tooth, having approximate dimensions of 3 mm × 2.5 mm × 1.5 mm. Teeth were divided into four groups (30 in each group). Group A AdperTM single bond 2 (3M ESPE), Group B AdperTM SE Plus (3M ESPE), Group C AdperTM Easy One (3M ESPE), Group D AdperTM Single Bond Universal (3M ESPE) bonding agents were applied as per the manufacturer's instructions and the cavities were then restored with nanohybrid composite resin (Tetric N Ceram Ivoclar Vivadent). Teeth were then thermocycled for 200 cycles at 5°-55°C with 60 seconds of dwell time. Specimens were subjected to a dye leakage test. Microleakage was evaluated using a stereomicroscope. Data was analysed using Kruskal- Wallis, Dunn and Mann-Whitney test to assess the difference in microleakage among various adhesives. RESULTS The present study revealed that the microleakage was more at the gingival margin when compared with occlusal and this was found to be statistically significant. At the occlusal margin statistical significant difference was found only between AdperTM Easy one and AdperTM SE Plus, on the other hand at gingival margin no statistical significant difference was found. CONCLUSION One step self etch agents showed less microleakage than total etches and universal adhesive at occlusal margin. Higher degree of microleakage was observed at gingival margin compared to occlusal margin.
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Affiliation(s)
- Anjali Gupta
- Senior Lecturer, Department of Conservative Dentistry and Endodontics, Rungta College of Dental Science and Research, Bhilai, Chhattisgarh, India
| | - Pradeep Tavane
- Professor, Department of Conservative Dentistry and Endodontics, Teerthankar Mahaveer Dental College, Moradabad, Uttar Pradesh, India
| | - Pankaj Kumar Gupta
- Reader, Department of Conservative Dentistry and Endodontics, Rungta College of Dental Science and Research, Bhilai, Chhattisgarh, India
| | - Bellam Tejolatha
- Senior Lecturer, Department of Conservative Dentistry and Endodontics, Rungta College of Dental Science and Research, Bhilai, Chhattisgarh, India
| | - Ashik Ali Lakhani
- Postgraduate Student, Department of Conservative Dentistry and Endodontics, Rungta College of Dental Science and Research, Bhilai, Chhattisgarh, India
| | - Ram Tiwari
- Senior Lecturer, Department of Public Health, Rungta College of Dental Science and Research, Bhilai, Chhattisgarh, India
| | - Shruti Kashyap
- Postgraduate Student, Department of Conservative Dentistry and Endodontics, Rungta College of Dental Science and Research, Bhilai, Chhattisgarh, India
| | - Gaurav Garg
- Postgraduate Student, Department of Conservative Dentistry and Endodontics, Rungta College of Dental Science and Research, Bhilai, Chhattisgarh, India
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Mirzakhani M, Mousavinasab SM, Atai M. The effect of acrylate-based dental adhesive solvent content on microleakage in composite restorations. Dent Res J (Isfahan) 2017; 13:515-520. [PMID: 28182040 PMCID: PMC5256015 DOI: 10.4103/1735-3327.197032] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Background: This study aimed to evaluate the effect of different percentages of ethanol solvent of an experimental methacrylate-based dentin bonding agent containing polyhedral oligomeric silsesquioxanes (POSS) on the microleakage of resin composite restorations. Materials and Methods: In this experimental study, 42 extracted human premolar teeth used and 84 standard Class V cavities were prepared on the buccal and lingual surfaces of the teeth. The teeth were divided into 6 groups of 7. Experimental bonding agents with different percentages of solvent were used in 5 groups and Single Bond® as a control. The teeth were restored with resin composite and subjected to thermal cycling test. Teeth were then immersed in a solution of 2% basic fuchsine dye for 24 h and sectioned buccolingually and scored using stereomicroscope with ×32 magnification. Microleakage data were analyzed using the Kruskal–Wallis, Mann–Whitney U, and Wilcoxon tests. Results: There were significant differences between the microleakage enamel margins (P = 0.036) and dentinal margins (P = 0.008) in all the groups. These significant differences were seen between the control group and groups containing 46 wt% solvent (P = 0.011), 46 wt% and 31 wt% solvent in dentinal (P = 0.027), 31 wt% and 0 wt% in enamel (P = 0.021), also 0 wt% and control in enamel (P = 0.039), and dentinal margins microleakage (P = 0.004). The microleakage in dentinal margins was higher than enamel margins (P < 0.001). In the groups with 46 wt% solvent (P = 0.103), 0 wt% (P = 0.122), and control group (P = 0.096), however, this difference was not significant. Conclusion: The adhesive containing 31 wt% solvent showed the least marginal microleakage, presence of POSS filler may also result in the reduction of microleakage.
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Affiliation(s)
- Mahboubeh Mirzakhani
- Department of Operative Dentistry, Dental School (Faculty), Islamic Azad University, Isfahan (Khorasgan) Branch, Iran
| | - Sayed Mostafa Mousavinasab
- Department of Operative Dentistry, Islamic Azad University, Isfahan (Khorasgan) Branch, Isfahan, Iran; Dental Materials Research Centre, Dental School, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Mohammad Atai
- Polymer Science Department, Polymer and Petrochemical Institute, Tehran, Iran
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Jacker-Guhr S, Ibarra G, Oppermann LS, Lührs AK, Rahman A, Geurtsen W. Evaluation of microleakage in class V composite restorations using dye penetration and micro-CT. Clin Oral Investig 2015; 20:1709-18. [DOI: 10.1007/s00784-015-1676-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Accepted: 11/19/2015] [Indexed: 10/22/2022]
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H K, A M, S A. The Temperature Dependence of Micro-Leakage between Restorative and Pulp Capping Materials by Cu Diffusion. Open Dent J 2015; 9:140-5. [PMID: 25926897 PMCID: PMC4407002 DOI: 10.2174/1874210601509010140] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Revised: 03/18/2015] [Accepted: 03/21/2015] [Indexed: 11/22/2022] Open
Abstract
We used the Cu ions for the leakage analysis between pulp capping and restorative materials. Theoretically, Cu has more advantages than Ag ions due to their smaller radii (rCu2+=73 pm and rAg2+=94 pm), lower mass density (dCu=8.96 g/cm3 and dAg=10.49 g/cm3) and higher radio opacity which can be more useful by X-ray or EDX detectors, cheaper price and more abundance in planet when compared with Ag element which is generally used in the leakage studies. The micro leakage between dental restorations and pulp capping materials has been determined by using Micro Computed Tomography, Scanning Electron Microscopy and EDX analysis. It is found that the leakage has temperature dependent mechanism which increases with the increasing temperature. As a result, using Cu solution for leakage studies in dentine is an effective and easy method which can be used in dental science.
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Affiliation(s)
- Kamalak H
- Inonu University, Faculty of Dentistry, Department of Restorative Dentistry, 44280, Malatya, Turkey
| | - Mumcu A
- Inonu University, Scienctific and Technological Research Center, 44280, Malatya, Turkey
| | - Altin S
- Inonu University, Science and Art Faculty, Physics Department, 44280 Malatya, Turkey
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Khosravi K, Mousavinasab SM, Samani MS. Comparison of microleakage in Class II cavities restored with silorane-based and methacrylate-based composite resins using different restorative techniques over time. Dent Res J (Isfahan) 2015; 12:150-6. [PMID: 25878680 PMCID: PMC4387627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
BACKGROUND Despite the growing tendency toward tooth-colored restorations in dentistry, polymerization shrinkage and subsequent marginal microleakage remains a problem. The aim of this in vitro study was to compare microleakage between silorane-based and methacrylate-based composite resins at different time intervals and with different restorative techniques. MATERIALS AND METHODS In this in vitro study, 108 sound extracted human molar teeth were used. Mesial and distal proximal class II boxes with dimensions of 1.5 mm depth and 4 mm width were prepared. The gingival margins of all cavities were 1 mm below the cement enamel junction. The teeth were randomly divided into three groups based on test materials. In the first group, the teeth were restored by a nanocomposite (Filtek Z350XT, 3MESPE) and SE Bond adhesive (Kuraray, Japan), in the second group, the teeth were restored with a silorane-based (Filtek P90, 3MESPE) and Filtek P90 Adhesive (3M ESPE, USA) and in the third group, the teeth were restored with a microhybrid posterior composite resin (Filtek P60, 3MESPE) and SE Bond adhesive (Kuraray, Japan). Half of the proximal cavities in each of these three groups were restored in two horizontal layers and the other half in four horizontal layers. After a period of aging (24-h, 3-month and 6-month) in water and then application of 500 thermal cycles, the teeth were immersed for 24-h in 0.5% fuchsin and evaluated under a stereomicroscope at ×36 magnification to evaluate leakage in gingival margin. Data was statistically analyzed using Kruskal-Wallis and Mann-Whitney U-tests. P ≤ 0.05 was considered as significant. RESULTS In Z350XT statistically significant differences were observed in microleakage in comparison of 24-h and 6-month intervals (P = 0.01) that was higher in 6-month. Comparison of microleakage in P90 and P60 composite resins was also statistically significant and was less in P90. Microleakage was not significantly different between P90 and Z350XT at 24-h. However, this difference was significant at 3-month and 6-month intervals. Differences in microleakage of P60 and Z-350XT composite resins were not statistically significant in all intervals (P = 0.38). P90 showed the lowest microleakage during storage in water. Z350XT had microleakage similar to P90 within 24-h, but after 6-month of storage in water, it showed the highest microleakage among all the groups. The number of layers (2 layers vs. 4 layers) did not result in any differences in microleakage scores of the composite resins (P = 0.42). CONCLUSION Water storage times did not result in any significant effect on microleakage of P90 and P60.
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Affiliation(s)
- Kazem Khosravi
- Torabinejad Dental Research Center and Department of Restorative Dentistry, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Seyed-Mostafa Mousavinasab
- Dental Material Research Center and Department of Restorative Dentistry, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Mahsa Sahraneshin Samani
- Department of Restorative Dentistry, School of Dentistry, Shahrekord University of Medical Sciences, Chaharmahalobakhtiyari, Iran,Address for correspondence: Dr. Mahsa Sahraneshin Samani, Resalat Dental Clinic (School of Dentistry), Chaleshtor Square, Shahrekord, Chaharmahalobakhtiyari, Iran. E-mail:
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Alaghemand H, Abolghasemzadeh F, Pakdel F, Judi Chelan R. Comparison of microleakage and thickness of resin cement in ceramic inlays with various temperatures. J Dent Res Dent Clin Dent Prospects 2014; 8:45-50. [PMID: 25024839 PMCID: PMC4091699 DOI: 10.5681/joddd.2014.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2013] [Accepted: 04/14/2013] [Indexed: 11/17/2022] Open
Abstract
Background and aims. Microleakage is still one of the major problems of composite-based restorations.This study compared the microleakage and thickness of resin cement in ceramic inlays with various temperatures. Materials and methods. Class V cavities were prepared on the buccal and lingual aspects of thirty human molars with occlusal margins in enamel and gingival margins in dentin (3 mm wide, 5 mm long and 2 mm deep). Laboratory-made inlays (LMI) were used for buccal cavities, and CAD/CAM inlays (CMI) were used for lingual cavities. All the cavities were divided into six groups (n=10): 1) LMI at -5°C; 2) LMI at 50°C; 3) LMI at room temperature (25°C); 4) CMI at -5°C; 5) CMI at 50°C; 6) CMI at room temperature (25°C). Inlays were bonded to cavities in a pulp pressure- and temperature-simulating device. After thermocycling and dye penetration, the teeth were divided into two mesiodistal halves. Amount of dye penetration and film thickness were measured under a stereomicroscope and analyzed with Kruskal-Wallis, Wilcoxon and Spearman's correlation tests ( = 0.05). Results. There were no statistically significant differences in leakage between different inlay temperatures (P > 0.05). The mean cement thickness in laboratory-made inlays (gingival margin, 83.7 ± 11 and occlusal margin, 84.7 ± 19) was greater than that in CAD/CAM inlays (gingival margin, 69 ± 16 and occlusal margin, 84.7 ± 16). No correlation was found be-tween cement thickness and microleakage either in enamel or dentin for any of the ceramic systems. Conclusion. Differences in inlay temperature had no effect on microleakage. CAD/CAM inlays had lower cement thickness than laboratory-made inlays, but this was not related to their microleakage.
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Affiliation(s)
- Homayoun Alaghemand
- Dental Material Research Center, Associate Professor, Department of Operative Dentistry, Faculty of Dentistry, Babol University of Medical Sciences, Babol, Iran
| | - Faezeh Abolghasemzadeh
- Assistant Professor, Department of Operative Dentistry, Faculty of Dentistry, Babol University of Medical Sciences, Babol, Iran
| | - Farzaneh Pakdel
- Assistant Professor, Department of Oral Medicine, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Reza Judi Chelan
- DentalMaterial Research Center, Member of Research Committee of Medical Students, Student of dentistry , Faculty of Dentistry , Babol University of Medical Sciences, Babol, Iran
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Sharafeddin F, Yousefi H, Modiri S, Tondari A, Safaee Jahromi SR. Microleakage of Posterior Composite Restorations with Fiber Inserts Using two Adhesives after ging. JOURNAL OF DENTISTRY (SHIRAZ, IRAN) 2013; 14:90-5. [PMID: 24724129 PMCID: PMC3927678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
STATEMENT OF PROBLEM Microleakage is one of the most frequent problems associated with resin composites, especially at the gingival margin of posterior restorations. Insertion of fibers in composite restorations can reduce the total amount of composite and help to decrease the shrinkage. PURPOSE The aim of this study was to evaluate the effect of polyethylene fiber inserts on gingival microleakage of class II composite restorations using two different adhesive systems. MATERIALS AND METHOD In this experimental study, class II cavities were prepared on 60 premolars. The gingival floor was located 1.0 mm below the CEJ. Dimension of each cavity were 3 mm buccolingually and 1.5 mm in axial depth. The specimens were divided into 4 groups according to the adhesive type and fiber insert (n=4). Single bond and Clearfill SE bond and Filtek p60 were used to restore the cavities. In groups without fiber inserts composite was adapted onto cavities using layering technique. For cavities with fiber inserts, 3 mm piece of fiber insert was placed onto the composite increment and cured. The specimens were stored in distilled water at 37(o)C for 6 months. All specimens were subjected to 3000 thermo-cycling. The tooth surfaces except for 1 mm around the restoration margins covered with two layers of nail varnish .The teeth were immersed in 2% Basic Fuchsin for 24 hours, then rinsed and sectioned mesiodistally. The microleakage was determined under a stereomicroscope (40X). Data were statistically analyzed by Kruskal-wallis and Mann-Whitney U tests (p< 0.05). RESULTS The Kruskal-Wallis test revealed no significant differences in mean microleakage scores among all groups (p= 0.281). CONCLUSION Use of polyethylene fiber inserts and etch-and-rinse and self-etch adhesives had no effect on microleakage in class II resin composite restorations with gingival margins below the CEJ after 6- month water storage.
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Affiliation(s)
- F Sharafeddin
- Dept. of Operative Dentistry, Biomaterial Research Center, School of Dentistry, Shiraz University of Medical Science, Shiraz, Iran
| | | | - Sh Modiri
- Post Graduate Student in Operative Dentistry, School of Dentistry, Shiraz University of Medical Science, Shiraz, Iran
| | - A Tondari
- Post Graduate Student in Operative Dentistry, School of Dentistry, Shiraz University of Medical Science, Shiraz, Iran
| | - SR Safaee Jahromi
- Dept. of Operative Dentistry, School of Dentistry, Shiraz University of Medical Science, Shiraz, Iran
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Shear bond strengths and morphological evaluation of filled and unfilled adhesive interfaces to enamel and dentine. Int J Dent 2012; 2012:858459. [PMID: 23209471 PMCID: PMC3502849 DOI: 10.1155/2012/858459] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2012] [Revised: 09/24/2012] [Accepted: 09/28/2012] [Indexed: 11/17/2022] Open
Abstract
In this laboratory study shear bond strengths of three filled and one unfilled adhesive systems to enamel and dentine were compared. Forty-eight extracted intact noncarious human mandibular molars were randomly assigned to two groups of 24 one for bonding to enamel and the other for bonding to dentine. Buccal and lingual surfaces of each tooth were randomly assigned for application of each one of filled (Prime & Bond NT (PBNT), Optibond Solo Plus (OBSP), and Clearfil SE Bond (CSEB)) and unfilled (Single Bond (SB)) adhesive systems (n = 12). A universal resin composite was placed into the translucent plastic cylinders (3 mm in diameter and 2 mm in length) and seated against the enamel and dentine surfaces and polymerized for 40 seconds. Shear bond strength was determined using a universal testing machine, and the results were statistically analyzed using two-way ANOVA, one-way ANOVA, t-test, and Tukey HSD post hoc test with a 5% level of significance.There were no statistically significant differences in bond strength between the adhesive systems in enamel, but CSEB and SB exhibited significantly higher and lower bond strength to dentine, respectively, than the other tested adhesive systems while there were no statistically significant differences between PBNT and OBSP.
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14
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Mortazavi V, Atai M, Fathi M, Keshavarzi S, Khalighinejad N, Badrian H. The effect of nanoclay filler loading on the flexural strength of fiber-reinforced composites. Dent Res J (Isfahan) 2012; 9:273-80. [PMID: 23087731 PMCID: PMC3469892] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
BACKGROUND Flexural strength of prosthesis made with dental composite resin materials plays an important role in their survival. The aim of this study was investigating the effect of nanoclay fillers and Poly (methyl methacrylate)-grafted (PMMA-grafted) nanoclay fillers loading on the flexural strength of fiber-reinforced composites (FRCs). MATERIALS AND METHODS Standard FRC bars (2 × 2 × 25 mm) for flexural strength testing were prepared with E-glass fibers and a synthetic resin loaded with different quantities of unmodified nanoclay and PMMA-grafted nanoclay filler particles (0% as control group, 0.2%, 0.5%, 1%, 2%, 5%). Flexural strength and flexural modulus were determined. The data were analyzed using 2-way, 1-way ANOVA and post hoc Tukey's test (α = 0.05). The fracture surfaces were evaluated by Scanning Electron Microscopy. RESULTS For groups with the same concentration of nanoparticles, PMMA-grafted filler-loaded group showed significantly higher flexural strength, except for 0.2% wt. For groups that contain PMMA-grafted nanoclay fillers, the 2% wt had the highest flexural strength value with significant difference to other subgroups. 1% wt and 2% wt showed significantly higher values compared to control (P < 0.05). None of the unmodified nanoclay particles loaded group represented statistically higher values of flexural strength compared to control group (P > 0.05). Flexural modulus of 2%, 5% wt PMMA-grafted and 0.5%, 1%, 2%, 5% wt unmodified nanoclay particles-loaded subgroups decreased significantly compared to control group (P < 0.05). CONCLUSIONS PMMA-grafted nanoclay filler loading may enhance the flexural strength of FRCs. Addition of unmodified nanoparticles cannot significantly improve the flexural strength of FRCs. Addition of both unmodified and PMMA-grafted nanoclay particles in some concentrations decreased the flexural modulus.
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Affiliation(s)
- Vajihesadat Mortazavi
- Torabinejad Dental Research Center and Department of Operative Dentistry, Isfahan, Iran,Address for correspondence: Professor Vajihesadat Mortazavi, Torabinejad Dental Research Center and Department of Operative Dentistry, School of Dentistry, Isfahan University of Medical Sciences, Isfahan-8174673461, Iran. E-mail:
| | - Mohammad Atai
- Iran Polymer and Petrochemical Institute (IPPI), Tehran, Iran
| | - Mohammadhossein Fathi
- Department of Materials Engineering, Biomaterials Research Group, Isfahan University of Technology, 8415683111, Isfahan, Iran
| | - Solmaz Keshavarzi
- Department of Operative Dentistry, School of Dentistry, Rafsanjan University of Medical Sciences, Rafsanjan, Iran
| | | | - Hamid Badrian
- School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran
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15
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Mousavinasab SM. Biocompatibility of composite resins. Dent Res J (Isfahan) 2011; 8:S21-9. [PMID: 23372592 PMCID: PMC3556298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Dental materials that are used in dentistry should be harmless to oral tissues, so they should not contain any leachable toxic and diffusible substances that can cause some side effects. Reports about probable biologic hazards, in relation to dental resins, have increased interest to this topic in dentists. The present paper reviews the articles published about biocompatibility of resin-restorative materials specially resin composites and monomers which are mainly based on Bis-GMA and concerns about their degradation and substances which may be segregated into oral cavity.
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Affiliation(s)
- Sayed Mostafa Mousavinasab
- Torabinejad Dental Research Center and Department of Restorative Dentistry, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran,Address for correspondence: Dr. Sayed Mostafa Mousavinasab, Torabinejad Dental Research Center and Department of Restorative Dentistry, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran. E-mail:
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