51
|
Effect of nanoclay addition on physical, chemical, optical and biological properties of experimental dental resin composites. Dent Mater 2017; 33:271-279. [DOI: 10.1016/j.dental.2016.11.016] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2016] [Revised: 11/23/2016] [Accepted: 11/30/2016] [Indexed: 11/18/2022]
|
52
|
Ali S, Sangi L, Kumar N. Exploring antibacterial activity and hydrolytic stability of resin dental composite restorative materials containing chitosan. Technol Health Care 2017; 25:11-18. [DOI: 10.3233/thc-161238] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Shahid Ali
- Medical Research Centre, Liaquat University of Medical & Health Sciences, Jamshoro, Pakistan
| | - Laila Sangi
- Department of Operative Dentistry, Liaquat University of Medical & Health Sciences, Jamshoro, Pakistan
| | - Naresh Kumar
- Department of Science of Dental Materials, Liaquat University of Medical & Health Sciences, Jamshoro, Pakistan
- Department of Restorative Dental Sciences, College of Dentistry, King Faisal University, Al Ahsa, Kingdom of Saudi Arabia
| |
Collapse
|
53
|
Müller JA, Rohr N, Fischer J. Evaluation of ISO 4049: water sorption and water solubility of resin cements. Eur J Oral Sci 2017; 125:141-150. [DOI: 10.1111/eos.12339] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/12/2017] [Indexed: 11/29/2022]
Affiliation(s)
- Johannes A. Müller
- Department of Rekonstructive Dentistry and Tempomandibular Disorders; Division of Dental Materials and Engineering; University Center for Dental Medicine Basel; University of Basel; Basel Switzerland
| | - Nadja Rohr
- Department of Rekonstructive Dentistry and Tempomandibular Disorders; Division of Dental Materials and Engineering; University Center for Dental Medicine Basel; University of Basel; Basel Switzerland
| | - Jens Fischer
- Department of Rekonstructive Dentistry and Tempomandibular Disorders; Division of Dental Materials and Engineering; University Center for Dental Medicine Basel; University of Basel; Basel Switzerland
| |
Collapse
|
54
|
Toledano M, Osorio R, Cabello I, Osorio E, Toledano-Osorio M, Aguilera FS. Oral Function Improves Interfacial Integrity and Sealing Ability Between Conventional Glass Ionomer Cements and Dentin. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2017; 23:131-144. [PMID: 28148310 DOI: 10.1017/s1431927617000010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The aim of this study was to investigate if load cycling affects interfacial integrity of glass ionomer cements bonded to sound- or caries-affected dentin. A conventional glass ionomer, Ketac Bond, and a resin-modified glass ionomer (Vitrebond Plus), were applied to dentin. Half of the specimens were load cycled. The interfaces were submitted to dye-assisted confocal microscopy evaluation. The unloaded specimens of sound and carious dentin were deficiently hybridized when Ketac Bond was used. Ketac Bond samples showed an absorption layer and an adhesive layer that were scarcely affected by fluorescein penetration (nanoleakage), in sound dentin. Nevertheless, a higher degree of micropermeability was found in carious dentin. In Ketac Bond specimens, load cycling improves the sealing capability and remineralization at the cement-dentin interface as porosity and nanoleakage was reduced. In contrast, samples treated with Vitrebond Plus exhibited a Rhodamine B-labeled absorption layer with scarce nanoleakage in both sound and carious unloaded dentin. The adhesive layer was affected by dye sorption throughout the porous cement-dentin interface. Samples treated with Vitrebond Plus had significant increases in nanoleakage and cement-dye sorption after load cycling. Within the limitations of an in vitro study, it is expected that conventional glass ionomers will provide major clinical efficacy when applied to carious-affected or sound dentin.
Collapse
Affiliation(s)
- Manuel Toledano
- Faculty of Dentistry,Dental Materials Section,University of Granada,Colegio Máximo de Cartuja s/n,18071 Granada,Spain
| | - Raquel Osorio
- Faculty of Dentistry,Dental Materials Section,University of Granada,Colegio Máximo de Cartuja s/n,18071 Granada,Spain
| | - Inmaculada Cabello
- Faculty of Dentistry,Dental Materials Section,University of Granada,Colegio Máximo de Cartuja s/n,18071 Granada,Spain
| | - Estrella Osorio
- Faculty of Dentistry,Dental Materials Section,University of Granada,Colegio Máximo de Cartuja s/n,18071 Granada,Spain
| | - Manuel Toledano-Osorio
- Faculty of Dentistry,Dental Materials Section,University of Granada,Colegio Máximo de Cartuja s/n,18071 Granada,Spain
| | - Fátima S Aguilera
- Faculty of Dentistry,Dental Materials Section,University of Granada,Colegio Máximo de Cartuja s/n,18071 Granada,Spain
| |
Collapse
|
55
|
Does Addition of Propolis to Glass Ionomer Cement Alter its Physicomechanical Properties? An in Vitro Study. J Clin Pediatr Dent 2017; 40:400-3. [PMID: 27617381 DOI: 10.17796/1053-4628-40.5.400] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
UNLABELLED Propolis is a natural resinous substance produced by honey bees. The antimicrobial effects of glass ionomer cement have been shown to improve with the addition of propolis; however its effect on the physicomechanical properties of the cement is not known. AIM The purpose of this study was to evaluate the compressive strength and solubility of conventional restorative glass ionomer cement following the addition of propolis. STUDY DESIGN Twenty half cylindrical samples were prepared with conventional restorative glass ionomer cement formed the control group. Another twenty samples were prepared with propolis added to conventional restorative glass ionomer cement formed the experimental group. The compressive strength was assessed using universal testing machine. To assess solubility, the samples were immersed in deionised water at room temperature, for 7 days. The solubility was measured as a difference in the weight of the sample; prior to immersion and following immersion at the end of each day. RESULTS The control group had a significantly higher mean compressive strength of 146.26 Mpa as compared to the experimental group (135.06 Mpa). The solubility between the groups was significant. CONCLUSION In comparison to the control group, incorporation of propolis to conventional restorative glass ionomer cement decreased the compressive strength significantly. The solubility of the cement in the experimental group increased significantly over 7day period as compared to the control group.
Collapse
|
56
|
KHAN AA, AL KHERAIF AA, SYED J, DIVAKAR DD, MATINLINNA JP. Enhanced resin titanium adhesion with silane primers using tribochemical silica-coating. Dent Mater J 2017; 36:111-116. [DOI: 10.4012/dmj.2016-142] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Aftab Ahmed KHAN
- Dental Biomaterials Research Chair, College of Applied Medical Sciences, King Saud University
| | | | - Jamaluddin SYED
- Oral Basic and Clinical Sciences Department, Faculty of Dentistry, King Abdul Aziz University
| | - Darshan Devang DIVAKAR
- Dental Biomaterials Research Chair, College of Applied Medical Sciences, King Saud University
| | - Jukka Pekka MATINLINNA
- Dental Materials Science, Faculty of Dentistry, The University of Hong Kong
- King Saud University under Visiting Faculty Program
| |
Collapse
|
57
|
Attar HE, Elhiny O, Salem G, Abdelrahman A, Attia M. A Twofold Comparison between Dual Cure Resin Modified Cement and Glass Ionomer Cement for Orthodontic Band Cementation. Open Access Maced J Med Sci 2016; 4:695-699. [PMID: 28028417 PMCID: PMC5175525 DOI: 10.3889/oamjms.2016.116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Revised: 10/04/2016] [Accepted: 10/05/2016] [Indexed: 11/05/2022] Open
Abstract
AIM To test the solubility of dual cure resin modified resin cement in a food simulating solution and the shear bond strength compared to conventional Glass ionomer cement. MATERIALS AND METHOD The materials tested were self-adhesive dual cure resin modified cement and Glass Ionomer (GIC). Twenty Teflon moulds were divided into two groups of tens. The first group was injected and packed with the modified resin cement, the second group was packed with GIC. To test the solubility, each mould was weighed before and after being placed in an analytical reagent for 30 days. The solubility was measured as the difference between the initial and final drying mass. To measure the Shear bond strength, 20 freshly extracted wisdom teeth were equally divided into two groups and embedded in self-cure acrylic resin. Four mm sections of stainless steel bands were cemented to the exposed buccal surfaces of teeth under a constant load of 500 g. Shear bond strength was measured using a computer controlled materials testing machine and the load required to deband the samples was recorded in Newtons. RESULTS GIC showed significantly higher mean weight loss and an insignificant lower Shear bond strength, compared to dual cure resin Cement. CONCLUSION It was found that dual cure resin modified cement was less soluble than glass ionomer cement and of comparable bond strength rendering it more useful clinically for orthodontic band cementation.
Collapse
Affiliation(s)
- Hanaa El Attar
- Suez Canal University, Faculty of Dentistry, Orthodontics, Faculty of Dentistry, Umm al Qura University, Orthodontics, Ismailia - el Gamaa street, Ismailia 0000, Egypt
| | - Omnia Elhiny
- National Research Center, El Bohouth str., Cairo 12622, Egypt
| | - Ghada Salem
- Faculty of Dentistry Fayoum University, Paedoodontics, Fayoum, Egypt
| | | | - Mazen Attia
- Faculty of Dentistry, Beni Suef University, Fixed Prosthodontics, Cairo, Egypt
| |
Collapse
|
58
|
Simmons JO, Meyers EJ, Lien W, Banfield RL, Roberts HW, Vandewalle KS. Effect of surface treatments on the mechanical properties and antimicrobial activity of desiccated glass ionomers. Dent Mater 2016; 32:1343-1351. [PMID: 27613394 DOI: 10.1016/j.dental.2016.08.214] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2016] [Revised: 05/16/2016] [Accepted: 08/11/2016] [Indexed: 11/26/2022]
Abstract
OBJECTIVES The purpose of this study was to evaluate the effect of various surface treatments on the mechanical properties and antibacterial activity of desiccated glass-ionomer (GI) and resin-modified glass-ionomer (RMGI) materials. METHODS One hundred GI and RMGI specimens were fabricated in a mold, stored in 100% humidity for 24h, placed in air to desiccate for 24h, and then stored for one week in one of the five media [casein phosphopeptide-amorphous calcium phosphate (CPP-ACP), chlorhexidine (CHX), sodium fluoride (NaF), cetylpyridinium chloride (CPC), or 100% humidity (control)]. Fifty GI and RMGI specimens were tested in flexure to determine flexural strength and modulus, with the fragments used for Knoop hardness testing. The remaining 50 GI and RMGI specimens were covered with a suspension of Streptococcus mutans and incubated for 24h. The bacterial suspension was removed and the specimens were washed. Sterile saline was added, vortex mixed, serially diluted, and plated. CFU/mLs were calculated after 3days of incubation. RESULTS Compared to the 100% humidity control group, surface treatment of the desiccated GI and RMGI materials had a variable effect on the mechanical properties. In general, NaF provided the greatest improvement in flexural strength and modulus. Surface treatment of the desiccated GI or RMGI specimens with CHX or CPC resulted in no growth of the S. mutans. NaF resulted in significantly lower CFU/mL than CPP-ACP, which was significantly lower than the control group. SIGNIFICANCE Surface treatment with 5% NaF provides improved antimicrobial and strength properties of desiccated GI or RMGI materials.
Collapse
Affiliation(s)
- Jennifer O Simmons
- United States Air Force, 1615 Truemper St., Joint Base San Antonio-Lackland, TX 78236, USA.
| | - Erik J Meyers
- United States Air Force, 1615 Truemper St., Joint Base San Antonio-Lackland, TX 78236, USA.
| | - Wen Lien
- United States Air Force, 3650 Chambers Pass, Ft. Sam Houston, TX 78023, USA.
| | - Rosalia L Banfield
- United States Air Force, 2200 Bergquist Dr., Joint Base San Antonio-Lackland, TX 78233, USA.
| | - Howard W Roberts
- United States Air Force, 301 Fisher St., Keesler AFB, MS 39534, USA.
| | - Kraig S Vandewalle
- United States Air Force, 1615 Truemper St., Joint Base San Antonio-Lackland, TX 78236, USA.
| |
Collapse
|
59
|
Farah RI, Al-Harethi N. Microleakage of Glass Ionomer-based Provisional Cement in CAD/CAM-Fabricated Interim Crowns: An in vitro Study. J Contemp Dent Pract 2016; 17:801-806. [PMID: 27794149 DOI: 10.5005/jp-journals-10024-1934] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
AIM The aim of this study was to compare in vitro the marginal microleakage of glass ionomer-based provisional cement with resin-based provisional cement and zinc oxide non-eugenol (ZONE) provisional cement in computer-aided design and computer-aided manufacturing (CAD/CAM)-fabricated interim restorations. MATERIALS AND METHODS Fifteen intact human premolars were prepared in a standardized manner for complete coverage of crown restorations. Interim crowns for the prepared teeth were then fabricated using CAD/CAM, and the specimens were randomized into three groups of provisional cementing agents (n = 5 each): Glass ionomer-based provisional cement (GC Fuji TEMP LT™), bisphenol-A-glycidyldimethacrylate (Bis-GMA)/ triethylene glycol dimethacrylate (TEGDMA) resin-based cement (UltraTemp® REZ), and ZONE cement (TempBond NE). After 24 hours of storage in distilled water at 37°C, the specimens were thermocycled and then stored again for 24 hours in distilled water at room temperature. Next, the specimens were placed in freshly prepared 2% aqueous methylene blue dye for 24 hours and then embedded in autopolymerizing acrylic resin blocks and sectioned in buccolingual and mesiodistal directions to assess dye penetration using a stereomicroscope. The results were statistically analyzed using a nonparametric Kruskal-Wallis test. Dunn's post hoc test with a Bonferroni correction test was used to compute multiple pairwise comparisons that identified differences among groups; the level of significance was set at p < 0.05. RESULTS All groups exhibited marginal microleakage; the Bis-GMA/TEGDMA resin-based provisional cement demonstrated the lowest microleakage scores, which were statistically different from those of the glass ionomer-based provisional cement and the ZONE cement. CONCLUSION The provisional cementing agents exhibited different sealing abilities. The Bis-GMA/TEGDMA resin-based provisional cement exhibited the most effective favorable sealing properties against dye penetration compared with the glass ionomer-based provisional cement and conventional ZONE cement. CLINICAL SIGNIFICANCE Newly introduced glass ionomer-based provisional cement proved to be inferior to resin-based provisional cement as far as marginal microleakage is concerned.
Collapse
Affiliation(s)
- Ra'fat I Farah
- Department of Prosthodontics, College of Dentistry, Qassim University, Al-Mulaydah, Qassim, Kingdom of Saudi Arabia, e-mail: ;
| | - Naji Al-Harethi
- Department of Prosthodontics, College of Dentistry, Qassim University, Al-Mulaydah, Qassim, Kingdom of Saudi Arabia
| |
Collapse
|
60
|
Tanthanuch S, Kukiattrakoon B, Peerasukprasert T, Chanmanee N, Chaisomboonphun P, Rodklai A. The effect of red and white wine on color changes of nanofilled and nanohybrid resin composites. Restor Dent Endod 2016; 41:130-6. [PMID: 27200281 PMCID: PMC4868876 DOI: 10.5395/rde.2016.41.2.130] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Accepted: 04/17/2016] [Indexed: 11/11/2022] Open
Abstract
Objectives This study investigated the effect of red and white wine on color changes of nanofilled and nanohybrid resin composite. Materials and Methods Sixty specimens of each resin composite were prepared. Baseline data color values were recorded using a spectrophotometer. Three groups of discs (n = 20) were then alternately immersed in red, white wine, and deionized water (as a control) for twenty five minutes and artificial saliva for five minutes for four cycles. Specimens were then stored in artificial saliva for twenty two hours. This process was repeated for five days following immersion in artificial saliva for two days. Subsequently, the process was repeated again. Data were analyzed by two-way repeated ANOVA, one-way ANOVA, and Tukey's HSD. Results Red wine caused significantly higher color change (ΔE* > 3.3) than did white wine and deionized water (p < 0.05). Nanohybrid resin composites had significantly more color changes than nanofilled resin composite (p < 0.05). Conclusions The effect of red and white wine on the color changes of resin composite restorative materials depended upon the physical and chemical composition of the restorative materials and the types of wine.
Collapse
Affiliation(s)
- Saijai Tanthanuch
- Department of Conservative Dentistry, Faculty of Dentistry, Prince of Songkla University, Hat Yai, Songkhla, Thailand.; Dental Materials Research Unit, Faculty of Dentistry, Prince of Songkla University, Hat Yai, Songkhla, Thailand
| | - Boonlert Kukiattrakoon
- Department of Conservative Dentistry, Faculty of Dentistry, Prince of Songkla University, Hat Yai, Songkhla, Thailand.; Dental Materials Research Unit, Faculty of Dentistry, Prince of Songkla University, Hat Yai, Songkhla, Thailand
| | - Thanwalee Peerasukprasert
- Department of Conservative Dentistry, Faculty of Dentistry, Prince of Songkla University, Hat Yai, Songkhla, Thailand
| | - Nilobon Chanmanee
- Department of Conservative Dentistry, Faculty of Dentistry, Prince of Songkla University, Hat Yai, Songkhla, Thailand
| | - Parnchanok Chaisomboonphun
- Department of Conservative Dentistry, Faculty of Dentistry, Prince of Songkla University, Hat Yai, Songkhla, Thailand
| | - Apisara Rodklai
- Department of Conservative Dentistry, Faculty of Dentistry, Prince of Songkla University, Hat Yai, Songkhla, Thailand
| |
Collapse
|
61
|
Felemban NH, Ebrahim MI. Effects of adding silica particles on certain properties of resin-modified glass-ionomer cement. Eur J Dent 2016; 10:225-229. [PMID: 27095901 PMCID: PMC4813440 DOI: 10.4103/1305-7456.178318] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
OBJECTIVE This study was conducted to evaluate the effect of incorporation of silica particles with different concentrations on some properties of resin-modified glass ionomer cement (RMGIC): Microleakage, compressive strength, tensile strength, water sorption, and solubility. MATERIALS AND METHODS Silica particle was incorporated into RMGIC powder to study its effects, one type of RMGIC (Type II visible light-cured) and three concentrations of silica particles (0.06, 0.08, and 0.1% weight) were used. One hundred and twenty specimens were fabricated for measuring microleakage, compressive strength, tensile strength, water sorption, and solubility. STATISTICAL ANALYSIS One-way analysis of variance and Tukey's tests were used for measuring significance between means where P ≤ 0.05. RESULTS RMGIC specimens without any additives showed significantly highest microleakage and lowest compressive and tensile strengths. CONCLUSION Silica particles added to RMGIC have the potential as a reliable restorative material with increased compressive strength, tensile strength, and water sorption but decreased microleakage and water solubility.
Collapse
Affiliation(s)
- Nayef H Felemban
- Department of Orthodontics, Faculty of Dentistry, Taif University, Taif, Saudi Arabia
| | - Mohamed I Ebrahim
- Department Restorative Dentistry, Faculty of Dentistry, Taif University, Taif, Saudi Arabia
| |
Collapse
|
62
|
Lung CYK, Sarfraz Z, Habib A, Khan AS, Matinlinna JP. Effect of silanization of hydroxyapatite fillers on physical and mechanical properties of a bis-GMA based resin composite. J Mech Behav Biomed Mater 2016; 54:283-94. [DOI: 10.1016/j.jmbbm.2015.09.033] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2015] [Revised: 09/22/2015] [Accepted: 09/29/2015] [Indexed: 10/22/2022]
|
63
|
Petropoulou A, Vrochari AD, Hellwig E, Stampf S, Polydorou O. Water sorption and water solubility of self-etching and self-adhesive resin cements. J Prosthet Dent 2015; 114:674-9. [DOI: 10.1016/j.prosdent.2015.06.002] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Revised: 06/01/2015] [Accepted: 06/05/2015] [Indexed: 11/30/2022]
|
64
|
Al Sunbul H, Silikas N, Watts DC. Resin-based composites show similar kinetic profiles for dimensional change and recovery with solvent storage. Dent Mater 2015. [PMID: 26220777 DOI: 10.1016/j.dental.2015.06.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
OBJECTIVES To investigate the sorption, solubility, mass change and hygroscopic expansion (solvent swelling) of resin-composites after long term storage in different solvents. METHODS Eight materials were studied: two bulk-fill flowable materials (SDR and Venus bulk fill, V-BF), a packable bulk-fill material (Tetric Evoceram bulk-fill, TET-BF), a fiber reinforced material (Ever X posterior, EVX), a nano-hybrid conventional material (Tetric Evoceram, TET) and micro-hybrid conventional materials (G-aenial anterior, GA-P and posterior, GA-A). Three groups of disk shaped specimens were prepared using split stainless steel molds. Each group was stored, respectively, in: water, 75% ethanol/water and methyl ethyl ketone (MEK). The total storage time was 180 d plus a reconditioning time of 120 d. A non-contact laser scanning micrometer was used to measure the diametral changes. RESULTS Significant differences were found in the sorption and solubility of the materials. Generally, MEK stored specimens had the highest values followed by 75% ethanol/water then water. A similar trend was found with the mass and volume changes (except for EVX). V-BF showed the highest sorption (98.1μg/mm(3)) and solubility (10μg/mm(3)) after MEK storage. Mass and volume changes showed near-linear correlation, with high Pearson coefficients (0.86-0.99). SIGNIFICANCE Generally the materials were most greatly affected by MEK storage compared to the other two solvents. The glass-fiber-reinforced EVX, however, was most affected by water immersion. The pattern of change/recovery behavior of the materials, during solvent challenge, was similar to the pattern of viscoelastic creep/recovery behavior of resin-composite materials.
Collapse
Affiliation(s)
- Hanan Al Sunbul
- School of Dentistry, The University of Manchester, Manchester, UK; College of Dentistry, King Saud University, Riyadh, Saudi Arabia
| | - Nick Silikas
- School of Dentistry, The University of Manchester, Manchester, UK.
| | - David C Watts
- School of Dentistry, The University of Manchester, Manchester, UK; Photon Science Institute, The University of Manchester, Manchester, UK.
| |
Collapse
|
65
|
Water sorption and solubility of core build-up materials. Dent Mater 2014; 30:e324-9. [DOI: 10.1016/j.dental.2014.08.374] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2014] [Revised: 08/07/2014] [Accepted: 08/08/2014] [Indexed: 11/19/2022]
|
66
|
Gonulol N, Ozer S, Sen Tunc E. Water Sorption, Solubility, and Color Stability of Giomer Restoratives. J ESTHET RESTOR DENT 2014; 27:300-6. [PMID: 25145876 DOI: 10.1111/jerd.12119] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
OBJECTIVES This study compared the color stability, water sorption, and solubility of a giomer composite and two nanohybrid composite resins. MATERIALS AND METHODS Disc-shaped specimens (1-mm thickness × 15-mm diameter) of a giomer (Beautifil II, Shofu, Kyoto, Japan) and two nanohybrid (Filtek Z550, 3M ESPE, St. Paul, MN, USA; Tetric N-Ceram, Ivoclar Vivadent, Schaan, Liechtenstein) composites (N = 10) were prepared. Baseline color measurements were taken, and specimens were immersed in water for 28 days. Following immersion, color values were remeasured, and color-change values (ΔE) were calculated. Water sorption and solubility were assessed by mass gain or loss after storage in water for 28 days. Data were analyzed with one-way analysis of variance and Tukey's post-hoc tests (p = 0.05). Pearson's correlation test was used to assess possible correlations between water sorption and solubility, water sorption and color stability, and solubility and color stability (p = 0.05). RESULTS Water sorbtion (%) and color change (ΔE) varied significantly among groups, with Beautifil II exhibiting the highest values (p < 0.001). No statistically significant differences were observed in water solubility values among the groups (p = 0.661); however, a linear, positive correlation was detected between solubility and discoloration (r = 0.368, p = 0.046). CONCLUSION Water sorption and discoloration values of the giomer composite group were significantly higher than those of the nanohybrids tested. CLINICAL SIGNIFICANCE The high levels of water sorption and discoloration of giomer composites are likely to have an adverse effect on esthetic restorations.
Collapse
Affiliation(s)
- Nihan Gonulol
- Department of Restorative Dentistry, Faculty of Dentistry, Ondokuz Mayıs University, Samsun, Turkey
| | - Sezin Ozer
- Department of Pediatric Dentistry, Faculty of Dentistry, Ondokuz Mayıs University, Samsun, Turkey
| | - Emine Sen Tunc
- Department of Pediatric Dentistry, Faculty of Dentistry, Ondokuz Mayıs University, Samsun, Turkey
| |
Collapse
|
67
|
Giannini M, Di Francescantonio M, Pacheco RR, Boaro LCC, Braga RR. Characterization of Water Sorption, Solubility, and Roughness of Silorane- and Methacrylate-based Composite Resins. Oper Dent 2014; 39:264-72. [DOI: 10.2341/12-526-l] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
SUMMARY
Objective
The objective of this study was to evaluate the surface roughness (SR), water sorption (WS), and solubility (SO) of four composite resins after finishing/polishing and after one year of water storage.
Materials and Methods
Two low-shrinkage composites (Filtek Silorane [3M ESPE] and Aelite LS [Bisco Inc]) and two composites of conventional formulations (Heliomolar and Tetric N-Ceram [Ivoclar Vivadent]) were tested. Their respective finishing and polishing systems (Sof-Lex Discs, 3M ESPE; Finishing Discs Kit, Bisco Inc; and Astropol F, P, HP, Ivoclar Vivadent) were used according to the manufacturers' instructions. Ten disc-shaped specimens of each composite resin were made for each evaluation. Polished surfaces were analyzed using a profilometer after 24 hours and one year. For the WS and SO, the discs were stored in desiccators until constant mass was achieved. Specimens were then stored in water for seven days or one year, at which time the mass of each specimen was measured. The specimens were dried again and dried specimen mass determined. The WS and SO were calculated from these measurements. Data were analyzed by two-way analysis of variance and Tukey post hoc test (α=0.05).
Results
Filtek Silorane showed the lowest SR, WS, and SO means. Water storage for one year increased the WS means for all composite resins tested.
Conclusions
The silorane-based composite resin results were better than those obtained for methacrylate-based resins. One-year water storage did not change the SR and SO properties in any of the composite resins.
Collapse
Affiliation(s)
- M Giannini
- Marcelo Giannini, DDS, MS, PhD, associate professor, Piracicaba Dental School, University of Campinas, Department of Restorative Dentistry, Piracicaba, SP, Brazil
| | - M Di Francescantonio
- Marina Di Francescantonio, DDS, MS, PhD student, Piracicaba Dental School, State University of Campinas, Department of Restorative Dentistry, Piracicaba, SP, Brazil
| | - RR Pacheco
- Rafael Rocha Pacheco, DDS, MS student, Piracicaba Dental School, State University of Campinas, Department of Dental Materials, Piracicaba, SP, Brazil
| | - LC Cidreira Boaro
- Letícia Cristina Cidreira Boaro, DDS, MS, PhD, School of Dentistry, Universidade de Santo Amaro, Department of Dentistry, São Paulo, SP, Brazil
| | - RR Braga
- Roberto R Braga, DDS, MD, PhD, University of São Paulo, Department of Dental Materials, São Paulo, SP, Brazil
| |
Collapse
|
68
|
Ozturk F, Malkoc MA, Corekci B, Aksakalli S, Malkoc S. Physical Properties of Different Orthodontic Composites. Turk J Orthod 2014. [DOI: 10.13076/tjo-d-14-00007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
69
|
Hotwani K, Thosar N, Baliga S. Comparative in vitro assessment of color stability of hybrid esthetic restorative materials against various children's beverages. J Conserv Dent 2014; 17:70-4. [PMID: 24554866 PMCID: PMC3915391 DOI: 10.4103/0972-0707.124154] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2013] [Revised: 08/29/2013] [Accepted: 10/08/2013] [Indexed: 11/25/2022] Open
Abstract
Purpose: The present study was aimed to evaluate and compare the color stability of two hybrid tooth-colored restorative materials, namely, resin-modified glass ionomer cement (GC Fuji II LC Capsules - GC Corporation, Tokyo, Japan) and giomer (Beautifil II - Shofu Inc, Kyoto, Japan) when subjected to immersion in various children's beverages. Materials and Methods: Standardized disc specimens were prepared using the test restorative materials. After preparation and rehydration of the specimens, baseline color evaluations were performed using spectrophotometer. The readings were recorded according to CIELAB color space. The experimental groups were further subdivided for immersion in orange juice, bournvita milk, and coke. Subsequent to immersion and pH cycling, new color evaluations were carried out after 1 week and 4 weeks for all the experimental groups. The mean color change values were calculated. Results: The obtained data was subjected to statistical analysis. The results indicated that giomer specimens exhibited less color change as compared to RMGIC specimens indicating better color stability. The maximum color changes were found with the use of coke for a period of 4 weeks. Conclusion: Amongst the two materials, giomer showed less color changes as compared to RMGIC indicating a better color stability.
Collapse
Affiliation(s)
- Kavita Hotwani
- Department of Pedodontics and Preventive Dentistry, Sharad Pawar Dental College, Sawangi, Wardha, Maharashtra, India
| | - Nilima Thosar
- Department of Pedodontics and Preventive Dentistry, Sharad Pawar Dental College, Sawangi, Wardha, Maharashtra, India
| | - Sudhindra Baliga
- Department of Pedodontics and Preventive Dentistry, Sharad Pawar Dental College, Sawangi, Wardha, Maharashtra, India
| |
Collapse
|
70
|
Fonseca ASQDS, Gerhardt KMDF, Pereira GDDS, Sinhoreti MAC, Schneider LFJ. Do new matrix formulations improve resin composite resistance to degradation processes? Braz Oral Res 2013; 27:410-6. [PMID: 24036979 DOI: 10.1590/s1806-83242013000500005] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2013] [Accepted: 07/10/2013] [Indexed: 11/22/2022] Open
Abstract
The aim of this study was to determine the degradation resistance of three new formulations-silorane-, Ormocer- and dimer-acid-based materials-and compare them to the traditional dimethacrylate-based materials. One silorane- (Filtek P90, P90), one Ormocer- (Ceram-X, CX), one dimer-acid- (N'Durance, ND) and two dimethacrylate-based (Filtek P60, P60; Tetric Ceram, TC) materials were investigated. Water sorption (Wsp) and solubility (Wsl) were determined after the materials were immersed in water for 28 days. Knoop hardness (KH) was determined before and after 24 h immersion in pure ethanol. The flexural-strength (FS) was determined by the bending test after one-week storage in a dry environment or after one-week immersion in pure ethanol. Data were submitted to analysis of variance (ANOVA) and Tukey's test (95%). The three new formulations showed lower Wsp than the dimethacrylate-based formulation. CX (0.50 ± 0.17%) and ND (0.72 ± 0.19%) exhibited the lowest Wsp, whereas P90 (0.02 ± 0.03%) and P60 (0.04 ± 0.03%) showed the lowest Wsl. All resins showed reduced Knoop hardness number (KHN) after ethanol immersion. P60 presented the lowest decrease in KH value (19 ± 5%). TC (48 ± 3%) and P90 (39 ± 9%) showed the highest KHN decrease after ethanol storage. The FS of CX, ND and TC were affected by ethanol storage. The new formulations did not improve the degradation resistance, as compared with the traditional methacrylate-based materials.
Collapse
|
71
|
Bayrak S, Ozalp N, Okte Z. Effects of drinks on solubility of different restorative materials. ACTA ACUST UNITED AC 2013. [DOI: 10.1179/143307511x12922272564148] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Affiliation(s)
- S Bayrak
- Department of Pediatric DentistryFaculty of Dentistry, University of Ondokuz Mayıs, Samsun, Turkey
| | - N Ozalp
- Department of Pediatric DentistryFaculty of Dentistry, University of Ankara, Ankara, Turkey
| | - Z Okte
- Department of Pediatric DentistryFaculty of Dentistry, University of Ankara, Ankara, Turkey
| |
Collapse
|
72
|
Alsharif SO, Hazizan MA, El-Aziz NAA, Ahmad ZA. Simulated Body Fluid Sorption and Solubility of Silica Reinforced Dental Resin Composites. ADVANCED MATERIALS RESEARCH 2013; 795:626-630. [DOI: 10.4028/www.scientific.net/amr.795.626] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
The aim of this study is to investigate the effect of filler loading on the sorption and solubility of Simulated Body Fluid (SBF) of self-prepared micro dental resin composites. The prepared resin composite was based on silica (SiO2) particles and bisphenol-a-glycidyl methacrylate (Bis-GMA) as a base monomer and triethylene glycol dimethacrylate (TEGDMA) as a co-monomer. The filler was mixed with monomers, in proportions of 40, 50 and 60 wt.%. A resin matrix containing 0 wt.% filler was used as the control composition to evaluate the effect of filler loading on the sorption and solubility of SBF. The experimental methods were based on the procedure mentioned in the ISO 4049 (2009) standard for dentistry-Polymer-based restorative Materials. The sorption and solubility of resin matrix/SiO2composite decreased gradually as the filler loading increased. The increase of filler loading showed significant differences in the sorption and solubility as tested by ANOVA (P= 0.000).
Collapse
|
73
|
Wei YJ, Silikas N, Zhang ZT, Watts DC. The relationship between cyclic hygroscopic dimensional changes and water sorption/desorption of self-adhering and new resin-matrix composites. Dent Mater 2013; 29:e218-26. [PMID: 23830294 DOI: 10.1016/j.dental.2013.05.010] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2012] [Revised: 05/15/2013] [Accepted: 05/23/2013] [Indexed: 10/26/2022]
Abstract
OBJECTIVES This study evaluated the relationship between mass changes and hygroscopic dimensional changes during water sorption/desorption cycles in new resin composites. METHODS A silorane posterior composite (Filtek(®) Silorane, FS), two micro-fine hybrid composites (GC Gradia Direct Anterior, GDA; GC Gradia Direct Posterior, GDP), a universal composite (GC Kalore, GCK), and a self-adhering flowable composite (Vertise(®) Flow, VF) were evaluated. 25 (n=5) disk specimens (15mm×2mm) were prepared according to ISO 4049. Water sorption was measured gravimetrically. Hygroscopic expansions were measured by a laser micrometer regularly during 150 d water storage and 40 d recondition periods, all at 37°C. Data were analyzed by repeated measures ANOVA, one-way ANOVA and Tukey's post hoc test (p<0.05). RESULTS Mass changes after 150 d water immersion ranged from 0.68% (±0.02) for FS to 2.83% (±0.11) for VF and the corresponding hygroscopic expansions were from 0.74% (±0.05) for FS to 4.79% (±0.18) for VF. The differences were significant for all materials (p<0.001), except mass changes between GCK and GDP, as well as hygroscopic changes between GCK and GDA. The relationship between hygroscopic expansions and mass changes was initially non-linear and then tended toward linear behavior. But at the late stage of water sorption the hygroscopic expansion of GCK and VF was slightly sigmoidal with respect to their mass changes. SIGNIFICANCE Relationships between hygroscopic expansion and mass change were determined for some diverse resin-matrix composites. The initial non-linearity for all materials suggests a lower expansion rate due to occupancy of internal free volume by water ingress. The silorane composite FS showed statistically the lowest mass change and hygroscopic dimensional change.
Collapse
Affiliation(s)
- Yong-Jie Wei
- Department of Prosthodontics, School of Stomatology, Capital Medical University, Beijing, PR China.
| | | | | | | |
Collapse
|
74
|
Porto ICCDM, Almeida AGA. Avaliação em curto e médio prazo da sorção e da solubilidade de resinas compostas à base de metacrilato e de silorano em saliva artificial. REVISTA DE ODONTOLOGIA DA UNESP 2013. [DOI: 10.1590/s1807-25772013000300006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
INTRODUÇÃO: A absorção/adsorção de moléculas de água por monômeros hidrofílicos dentro de materiais resinosos expostos à umidade da boca pode resultar em degradação. OBJETIVO: Este estudo avaliou sorção e solubilidade de resinas compostas à base de metacrilato e silorano em contato com saliva artificial, nos períodos de um dia (curto prazo), e 30 e 90 dias (médio prazo). MATERIAL E MÉTODO: Sessenta corpos de prova foram confeccionados com as resinas Filtek® Z250 e Filtek® P90 Silorano (3M/ESPE), e depois imersos em saliva artificial a 37 ± 1 ºC durante um, 30 e 90 dias. Os dados foram analisados usando-se ANOVA um fator/dois fatores seguido dos testes Tukey ou Tamhane (α = 0,05). RESULTADO: As médias de sorção das duas resinas aumentaram com o tempo (p = 0,001). A sorção de Z250 (1 e 90 d) foi significativamente maior do que de P90 (p = 0,008), com valores semelhantes após 30 dias. A solubilidade das resinas também aumentou com o tempo, com diferença significativa entre todos os períodos (p = 0,001), exceto para a resina P90 (entre 1 e 30 d). Não houve diferença estatística significante entre os grupos Z250 (1 d) e P90 (1 dia), Z250 (1 d) e P90 (30 d), e Z250 (30 d) e P90 (90 d). Para os demais pares, comprovaram-se diferenças significativas (p < 0,001). CONCLUSÃO: As propriedades de sorção e solubilidade das resinas compostas testadas foram influenciadas pelo tempo de exposição à saliva artificial. O silorano teve desempenho ora melhor ora semelhante à resina de metacrilato.
Collapse
|
75
|
SVIZERO NDR, SILVA MS, ALONSO RCB, RODRIGUES FP, HIPÓLITO VD, CARVALHO RM, D'ALPINO PHP. Effects of curing protocols on fluid kinetics and hardness of resin cements. Dent Mater J 2013; 32:32-41. [DOI: 10.4012/dmj.2012-085] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
76
|
Ceylan G, Dede DÖ, Külünk S, Ongöz Dede F. Effects of refractive index solutions on the color of different luting cements. Acta Odontol Scand 2013; 71:88-91. [PMID: 22300162 DOI: 10.3109/00016357.2011.654244] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
PURPOSE The purpose of this study is to determine the effects of refractive index solutions on the color of different luting cements at different periods. MATERIALS AND METHODS Fourteen disc-shaped specimens were prepared for three different universal shade luting cements. All specimens were divided into two groups and a phthalate ester and glycerol refractive index solution was applied to the specimens at different periods. Color differences (ΔE*) were calculated for before and after 5, 15, 60 min and 24 h periods of applying refractive index solutions. Data were analyzed with multiple analysis of variance (ANOVA) and mean values were compared by the Tukey HSD test (α = 0.05). RESULTS Periods and periods-cement interaction were statistically significant (p ≤ 0.05). There was no statistically significant difference between the mean ΔE values of refractive index solutions and cement groups (p > 0.05). CONCLUSION Refractive index solutions affected the color of luting cements.
Collapse
Affiliation(s)
- Gözlem Ceylan
- Department of Prosthodontics, Dental Faculty of Ondokuz Mayıs University, Samsun, Turkey
| | | | | | | |
Collapse
|
77
|
Sauro S, Osorio R, Fulgêncio R, Watson TF, Cama G, Thompson I, Toledano M. Remineralisation properties of innovative light-curable resin-based dental materials containing bioactive micro-fillers. J Mater Chem B 2013; 1:2624-2638. [DOI: 10.1039/c3tb00205e] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
78
|
Bertassoni LE, Orgel JPR, Antipova O, Swain MV. The dentin organic matrix - limitations of restorative dentistry hidden on the nanometer scale. Acta Biomater 2012; 8:2419-33. [PMID: 22414619 PMCID: PMC3473357 DOI: 10.1016/j.actbio.2012.02.022] [Citation(s) in RCA: 130] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2011] [Revised: 02/16/2012] [Accepted: 02/28/2012] [Indexed: 11/28/2022]
Abstract
The prevention and treatment of dental caries are major challenges occurring in dentistry. The foundations for modern management of this dental disease, estimated to affect 90% of adults in Western countries, rest upon the dependence of ultrafine interactions between synthetic polymeric biomaterials and nanostructured supramolecular assemblies that compose the tooth organic substrate. Research has shown, however, that this interaction imposes less than desirable long-term prospects for current resin-based dental restorations. Here we review progress in the identification of the nanostructural organization of the organic matrix of dentin, the largest component of the tooth structure, and highlight aspects relevant to understating the interaction of restorative biomaterials with the dentin substrate. We offer novel insights into the influence of the hierarchically assembled supramolecular structure of dentin collagen fibrils and their structural dependence on water molecules. Secondly, we review recent evidence for the participation of proteoglycans in composing the dentin organic network. Finally, we discuss the relation of these complexly assembled nanostructures with the protease degradative processes driving the low durability of current resin-based dental restorations. We argue in favour of the structural limitations that these complexly organized and inherently hydrated organic structures may impose on the clinical prospects of current hydrophobic and hydrolyzable dental polymers that establish ultrafine contact with the tooth substrate.
Collapse
Affiliation(s)
- Luiz E Bertassoni
- Biomaterials Science Research Unit, Faculty of Dentistry, University of Sydney, United Dental Hospital, NSW, Australia.
| | | | | | | |
Collapse
|
79
|
Lu LM, Zuo KH, Zeng YP. Fabrication and properties of surface-modified β-Si3N4whiskers reinforced dental resin composites. J Appl Polym Sci 2012. [DOI: 10.1002/app.38125] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
80
|
Barbosa RPDS, Pereira-Cenci T, Silva WMD, Coelho-de-Souza FH, Demarco FF, Cenci MS. Effect of cariogenic biofilm challenge on the surface hardness of direct restorative materials in situ. J Dent 2012; 40:359-63. [DOI: 10.1016/j.jdent.2012.01.012] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2011] [Revised: 01/17/2012] [Accepted: 01/24/2012] [Indexed: 10/14/2022] Open
|
81
|
Carvalho FG, Sampaio CS, Fucio SBP, Carlo HL, Correr-Sobrinho L, Puppin-Rontani RM. Effect of chemical and mechanical degradation on surface roughness of three glass ionomers and a nanofilled resin composite. Oper Dent 2012; 37:509-17. [PMID: 22433031 DOI: 10.2341/10-406-l] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Nanofillers have been incorporated into glass ionomer (GI) restorative materials to improve their mechanical and surface properties. The aim of this present laboratory study was to compare the superficial roughness (Ra) of nanofilled GI (Ketac N100) with that of conventional GI (Fuji IX GP), resin-modified GI (Vitremer), and a nanofilled resin composite (Filtek Supreme) after pH cycling and toothbrush abrasion. Ten specimens of each material were made using Teflon molds, which were polished using aluminum-oxide abrasive disks. Three measurements of Ra were made of each specimen to serve as baseline values. The specimens were submitted to pH cycling for 10 days in a demineralization solution for six hours (pH 4.3) and were then stored in remineralization solution for 18 hours (pH 7.0). Ra measurements were recorded after the pH cycling. Specimens were then submitted to toothbrush abrasion in a brushing machine with a 200g load for 30,000 cycles at 250 cycles/min. The Ra values were then recorded. The surface morphology of specimens from each group was analyzed using a scanning electron microscope. Data were analyzed by analysis of variance, Tukey, and t-tests. After toothbrushing, only Fuji IX GP (1.10 ± 0.80) showed Ra values that were statistically different from those of the other materials evaluated. Ketac N100 (0.68 ± 0.16) showed intermediate Ra values, but it did not differ statistically from the results associated with Vitremer (1.04 ± 0.46) and Filtek (0.30 ± 0.15). Ketac N100 showed intermediate values of superficial roughness among the conventional glass ionomer cement, resin-modified glass ionomer cements, and the nanofilled resin after chemical and mechanical degradation.
Collapse
Affiliation(s)
- F G Carvalho
- Federal University of Campina Grande, Unidade Acadêmica de Ciências Biológicas, Paraíba, Brazil.
| | | | | | | | | | | |
Collapse
|
82
|
Busato PDMR, Oliveira ECSD, Busato MCA, Mendonça MJ, Rodrigues NA, Vendrame TK, Camilotti V. Comparação das propriedades de sorção e solubilidade de cimentos submetidos a diferentes soluções e tempos de armazenagem. POLIMEROS 2012. [DOI: 10.1590/s0104-14282012005000008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A finalidade deste estudo foi avaliar in vitro algumas propriedades dos cimentos Rely X U100 (3M ESPE), Rely X Luting (3M ESPE) e All Cem (FGM), como a sorção e solubilidade em água destilada e numa solução de álcool 75%, por períodos de 7 e 15 dias. Foram confeccionados 60 corpos-de-prova, divididos em três grupos (n = 20), de acordo com o cimento escolhido. Eles foram então divididos em quatro grupos de acordo com os fatores avaliados, tipo de solução e período de avaliação. Os espécimes foram padronizados com 8 mm de diâmetro e 1 mm de espessura, sendo polimerizados sobre lâminas de microscopia e matriz de poliéster e os excessos foram removidos com lâmina de bisturi. As amostras foram transferidas para uma estufa a 37 °C até atingir a massa constante, denominada M1. Na sequência, foram imersas em suas respectivas soluções e permaneceram armazenadas por 7 e 15 dias. Decorrido este período, os espécimes foram pesados novamente, obtendo-se a M2. Para obter a nova massa constante, denominada M3, os mesmos retornaram à estufa a 37 °C. Para o cálculo da sorção e da solubilidade, foram utilizadas equações, sendo (M2-M3)/V e (M1-M3)/V, respectivamente. Os resultados foram submetidos à ANOVA de dois fatores.
Collapse
|
83
|
Sande FHVD, Silva AFD, Michelon D, Piva E, Cenci MS, Demarco FF. Surface roughness of orthodontic band cements with different compositions. J Appl Oral Sci 2011; 19:223-7. [PMID: 21625737 PMCID: PMC4234333 DOI: 10.1590/s1678-77572011000300008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2009] [Accepted: 04/29/2010] [Indexed: 12/03/2022] Open
Abstract
Objectives The present study evaluated comparatively the surface roughness of four
orthodontic band cements after storage in various solutions. Material and Methods eight standardized cylinders were made from 4 materials: zinc phosphate cement
(ZP), compomer (C), resin-modified glass ionomer cement (RMGIC) and resin cement
(RC). Specimens were stored for 24 h in deionized water and immersed in saline (pH
7.0) or 0.1 M lactic acid solution (pH 4.0) for 15 days. Surface roughness
readings were taken with a profilometer (Surfcorder SE1200) before and after the
storage period. Data were analyzed by two-way ANOVA and Tukey's test (comparison
among cements and storage solutions) or paired t-test (comparison
before and after the storage period) at 5% significance level. Results The values for average surface roughness were statistically different (p<0.001)
among cements at both baseline and after storage. The roughness values of cements
in a decreasing order were ZP>RMGIC>C>R (p<0.001). After 15 days,
immersion in lactic acid solution resulted in the highest surface roughness for
all cements (p<0.05), except for the RC group (p>0.05). Compared to the
current threshold (0.2 µm) related to biofilm accumulation, both RC and C remained
below the threshold, even after acidic challenge by immersion in lactic acid
solution. Conclusions Storage time and immersion in lactic acid solution increased the surface roughness
of the majority of the tested cements. RC presented the smoothest surface and it
was not influenced by storage conditions.
Collapse
|
84
|
Juchem CDO, Leitune VCB, Collares FM, Samuel SMW. Effect of light sources on nanohardness, elastic modulus and water sorption of a composite resin. POLIMEROS 2011. [DOI: 10.1590/s0104-14282011005000031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The aim of this study was to evaluate the effect of a light source on nanohardness, elastic modulus, water sorption and solubility of a composite resin. Four curing units were used, three of which had an LED and another had a halogen source. The resin composite Z250 (3M ESPE) was used for all tests. For water sorption and solubility, five resin disks were made (15 mm in diameter and 1 mm thick), and these were polymerized for 20 seconds at nine different points (1 in the center and 8 around). For nanohardness and elastic modulus evaluation, 20 cylinders (5 for each group) were made with a bipartite steel matrix (6.0 mm diameter and 4.0 mm thick). The results of this study showed that the group polymerized with the Radii light-curing unit presented less water sorption than other curing units (p < 0.05). No statistical difference between units was found in nanohardness in 1mm-thick specimens. However, decreased nanohardness was shown at higher resin composite depth (p < 0.05). A Pearson correlation showed a strong positive relationship between nanohardness and elastic modulus for all groups and depths. The light source affects the water sorption, nanohardness and elastic modulus of composite resins.
Collapse
|
85
|
Behr M, Weiser F, Meier M, Schneider-Feyrer S, Hahnel S, Handel G, Rosentritt M. Influence of water sorption of the underlying abutment on fracture resistance of zirconia copings. Acta Odontol Scand 2011; 69:170-5. [PMID: 21271784 DOI: 10.3109/00016357.2010.549150] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE To investigate the influences of abutment water sorption and various aging parameters on the fracture resistance of zirconia copings. METHODS Using a master die, identical replicas were made from three resin materials. The first was a melamine resin with very high water sorption (n = 48), the second an experimental resin core build-up composite with moderate water sorption (n = 40) and the third a commercially available core build-up composite with low water sorption (n = 40). On the abutment replicas, zirconia copings (n = 128) were made using a computer-aided design-computer-aided manufacturing system. The copings were luted onto the abutments using zinc oxide phosphate cement. In the melamine group, a subgroup of samples (n = 8) was cemented with a composite cement as controls. The forty specimens in every abutment material group were randomly divided into one of five subgroups, as follows: (i) not aged; (ii) mechanically (dry) loaded only (50 N; 1.2 × 10(6) cycles); (iii) stored for 10 days in water; (iv) thermally cycled (TC; 6000 × 5/55°C); and (v) TC and mechanically loaded (TCML; 50 N, 1.2 × 10(6); 6000 × 5/55°C). After aging, all copings were loaded to fracture. RESULTS A statistically significant difference was found between the three abutment-die groups if the samples were aged by TCML. The zirconia copings cemented on abutments with high water sorption fractured during TCML, and the subgroup with moderate water sorption had significantly lower fracture resistance. A change of luting material had no impact on this behavior. CONCLUSION Only the simultaneous combination of all chosen aging factors (TCML) was able to detect a difference in fracture behavior of a zirconia coping luted on abutments with varying water sorption.
Collapse
Affiliation(s)
- Michael Behr
- Department of Prosthodontics, Regensburg University Medical Center, Regensburg, Germany.
| | | | | | | | | | | | | |
Collapse
|
86
|
Diffusion and concurrent solubility of self-adhering and new resin–matrix composites during water sorption/desorption cycles. Dent Mater 2011; 27:197-205. [DOI: 10.1016/j.dental.2010.10.014] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2010] [Accepted: 10/25/2010] [Indexed: 11/22/2022]
|
87
|
The diffusion kinetics of a nanofilled and a midifilled resin composite immersed in distilled water, artificial saliva, and lactic acid. Clin Oral Investig 2010; 15:393-401. [DOI: 10.1007/s00784-010-0392-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2009] [Accepted: 01/24/2010] [Indexed: 11/28/2022]
|
88
|
Marquezan M, Fagundes TC, Toledano M, Navarro MFDL, Osorio R. Differential bonds degradation of two resin-modified glass-ionomer cements in primary and permanent teeth. J Dent 2009; 37:857-64. [PMID: 19631441 DOI: 10.1016/j.jdent.2009.06.018] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2009] [Revised: 06/18/2009] [Accepted: 06/26/2009] [Indexed: 10/20/2022] Open
Abstract
OBJECTIVES To evaluate the effect of chemical degradation on bond strength of resin-modified glass-ionomer cements bonded to primary and permanent dentin. METHODS Class I cavities of permanent and primary extracted human molars were restored with two resin-modified glass-ionomer cements: Fuji II LC and Vitremer, and stored in water for 24h. Half samples were immersed in 10% NaOCl aqueous solution for 5h. Teeth were sectioned into beams and tested for microtensile bond strengths. Results were analyzed with multiple ANOVA and Tukey's tests (p<0.05). Analysis of debonded surfaces was performed by SEM. RESULTS 24h bond strengths for Vitremer and Fuji II LC were similar. For Fuji II, bond strength values were higher for primary than for permanent dentin. Vitremer bond strength was similar for both. Chemical degradation did not affect Fuji II LC bond strength to dentin. However, decreases in bond strength were found for Vitremer groups after NaOCl immersion. Signs of glass ionomer-dentin interaction were evident by SEM analysis for Fuji II LC specimens. CONCLUSIONS Vitremer and Fuji II presented similar bond strength at 24. Vitremer dentin bonds were prone to chemical degradation. Fuji II LC-dentin bonds showed typical features of glass-ionomer dentin interaction at the bonded interfaces, and were resistant to in vitro degradation.
Collapse
Affiliation(s)
- Marcela Marquezan
- Departament of Orthodontics and Pediatric Dentistry, Universidade de São Paulo - USP, Cidade Universitária, São Paulo - SP, Brazil
| | | | | | | | | |
Collapse
|
89
|
da Silva EM, Almeida GS, Poskus LT, Guimarães JGA. Relationship between the degree of conversion, solubility and salivary sorption of a hybrid and a nanofilled resin composite. J Appl Oral Sci 2009; 16:161-6. [PMID: 19089210 PMCID: PMC4327638 DOI: 10.1590/s1678-77572008000200015] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2007] [Accepted: 01/18/2008] [Indexed: 11/27/2022] Open
Abstract
This study analyzed the relationship between the degree of conversion (DC), solubility, and salivary sorption of a hybrid (Filtek P 60) and a nanofilled resin composite (Filtek Supreme), and evaluated the influence of the light-activation mode on these properties. Two light-activation modes were used: Conventional (C; 850 mW/cm2 for 20 s) and Soft-start (SS; 100-1,000 mW/cm2 for 10 s + 1,000 mW/cm2 for 10 s). The DC (%) was evaluated by FT-Raman spectroscopy. The solubility and salivary sorption were measured after immersion in artificial saliva for 7 days. Data were analyzed by ANOVA and Student-Newman-Keuls' test and linear regression analysis (α = 0.05). The DC varied from 50.52% (nanofilled composite) to 57.15% (hybrid composite), and was influenced by the light-activation mode: C > SS. The solubility (0.45 μg/mm3) and salivary sorption (8.04 μg/mm3) of the nanofilled composite were greater than those of the hybrid composite (0.40 μg/mm3/ 6.87 μg/mm3), and were influenced by the light-activation mode: SS > C. Correlation was found between DC and solubility (r = - 0.89, p<0.05), as well as between solubility and salivary sorption (r = 0.95). These findings suggest that nanofilled composites may present higher degradation in the oral environment than hybrid ones. Soft-start light-activation mode may increase the solubility of resin composites.
Collapse
Affiliation(s)
- Eduardo Moreira da Silva
- Department of Restorative Dentistry, School of Dentistry, Federal Fluminense University, Niterói, Rio de Janeiro, Brazil.
| | | | | | | |
Collapse
|
90
|
YESILYURT C, YOLDAS O, ALTINTAS SH, KUSGOZ A. Effects of food-simulating liquids on the mechanical properties of a silorane-based dental composite. Dent Mater J 2009; 28:362-7. [DOI: 10.4012/dmj.28.362] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
91
|
Buruiana T, Melinte V, Stroea L, Buruiana EC. Urethane Dimethacrylates with Carboxylic Groups as Potential Dental Monomers. Synthesis and Properties. Polym J 2009. [DOI: 10.1295/polymj.pj2009131] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
92
|
Zhang Y, Xu J. Effect of immersion in various media on the sorption, solubility, elution of unreacted monomers, and flexural properties of two model dental composite compositions. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2008; 19:2477-2483. [PMID: 18253815 DOI: 10.1007/s10856-008-3369-6] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2007] [Accepted: 01/02/2008] [Indexed: 05/25/2023]
Abstract
Immersion in various media has different effect on the properties of dental composites, such as sorption, solubility, elution of unreacted monomers, flexural strength, and flexural elastic modulus. In the present work, the effect of immersion in various media and the relationship between the variation of these properties and the components of dental composite were investigated. Two model dental composites were immersed in three different media-distilled water, artificial saliva, and ethanol/water, respectively, for a certain time. Their sorption, solubility, flexural strength, and flexural elastic modulus were tested according to the international standard. Elution of unreacted monomers was analyzed by using high performance liquid chromatography (HPLC) and the surface morphology of samples after immersion was observed using scanning electron microscope (SEM). The results showed that the effect on properties depended on the immersion media where ethanol/water had the most significant effect and these properties were related to the components of dental composite.
Collapse
Affiliation(s)
- Yujie Zhang
- Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P.R. China
| | | |
Collapse
|
93
|
Water uptake and strength characteristics of a nanofilled resin-based composite. J Dent 2008; 36:186-93. [DOI: 10.1016/j.jdent.2007.11.015] [Citation(s) in RCA: 106] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2007] [Revised: 11/22/2007] [Accepted: 11/24/2007] [Indexed: 11/17/2022] Open
|
94
|
MESE A, BURROW MF, TYAS MJ. Sorption and solubility of luting cements in different solutions. Dent Mater J 2008; 27:702-9. [DOI: 10.4012/dmj.27.702] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
95
|
Rüttermann S, Krüger S, Raab WHM, Janda R. Polymerization shrinkage and hygroscopic expansion of contemporary posterior resin-based filling materials—A comparative study. J Dent 2007; 35:806-13. [PMID: 17826883 DOI: 10.1016/j.jdent.2007.07.014] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2007] [Revised: 07/07/2007] [Accepted: 07/29/2007] [Indexed: 10/22/2022] Open
Abstract
OBJECTIVES To investigate the polymerization shrinkage and hygroscopic expansion of contemporary posterior resin-based filling materials. METHODS The densities of SureFil (SU), CeramXMono (CM), Clearfil AP-X (CF), Solitaire 2 (SO), TetricEvoCeram (TE), and Filtek P60 (FT) were measured using the Archimedes' principle prior to and 15min after curing for 20, 40 and 60s and after 1h, 24h, 7 d, and 30 d storage at 37 degrees C in water. Volumetric changes (DeltaV) in percent after polymerization and after each storage period in water were calculated from the changes of densities. Water sorption and solubility were determined after 30 d for all specimens and their curing times. Two-way ANOVA was calculated for shrinkage and repeated measures ANOVA was calculated for hygroscopic expansion (p<0.05). RESULTS DeltaV depended on filler load but not on curing time (SU approximately -2.0%, CM approximately -2.6%, CF approximately -2.1%, SO approximately -3.3%, TE approximately -1.7%, FT approximately -1.8%). Hygroscopic expansion depended on water sorption and solubility. Except for SU, all materials showed DeltaV approximately +1% after water storage. CONCLUSION Polymerization shrinkage depended on the type of resin-based filling material but not on curing time. Shrinkage was not compensated by hygroscopic expansion.
Collapse
Affiliation(s)
- Stefan Rüttermann
- Heinrich-Heine-University, Medical Faculty, Centre of Dentistry, Department of Operative and Preventive Dentistry and Endodontics, Moorenstr. 5, Geb. 18.13, D-40225 Düsseldorf, Germany
| | | | | | | |
Collapse
|
96
|
Janda R, Roulet JF, Latta M, Rüttermann S. Water sorption and solubility of contemporary resin-based filling materials. J Biomed Mater Res B Appl Biomater 2007; 82:545-51. [PMID: 17285606 DOI: 10.1002/jbm.b.30760] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
PURPOSE Evaluation of water sorption and solubility of contemporary resin-based filling materials. METHODS Specimens of Herculite (HE), Point 4 (P4), TetricCeram (TC), Miris (MI), TetricCeram HB (HB), Solitaire 2 (SO), SureFil (SU), Definite (DE), Admira (AD), Dyract AP (DY), Compoglass F (CO), and TetricFlow (TF) were prepared according to ISO 4049. Water sorption and solubility were measured after water storage at 37 degrees C for 7 days. RESULTS Water sorption was HE 14 microg mm(-3), P4 17 microg mm(-3), TC 12 microg mm(-3), MI 13 microg mm(-3), HB 9 microg mm(-3), SO 18 microg mm(-3), SU 9 microg mm(-3), DE 14 microg mm(-3), AD 27 microg mm(-3), DY 19 microg mm(-3), CO 23 microg mm(-3), and TF 19 microg mm(-3). Solubility was HE 3 microg mm(-3), P4 3 microg mm(-3), TC 1 microg mm(-3), MI 0 microg mm(-3), HB 0 microg mm(-3), SO 3 microg mm(-3), SU 0 microg mm(-3), DE 1 microg mm(-3), AD 2 microg mm(-3), DY 4 microg mm(-3), CO -2 microg mm(-3), and TF 1 microg mm(-3). CONCLUSION All materials met the corresponding requirement in ISO 4049. Filler load negatively correlated with water sorption but not with solubility. There was an influence of the resin matrix, too. No significant differences were found between composites, ormocers, and compomers.
Collapse
Affiliation(s)
- Ralf Janda
- Medical Faculty, Department of Operative and Preventive Dentistry and Endodontics, Centre of Dentistry, Heinrich-Heine-University, Düsseldorf, Germany
| | | | | | | |
Collapse
|
97
|
Sideridou ID, Achilias DS, Karabela MM. Sorption kinetics of ethanol/water solution by dimethacrylate-based dental resins and resin composites. J Biomed Mater Res B Appl Biomater 2007; 81:207-18. [PMID: 16941599 DOI: 10.1002/jbm.b.30655] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
In the present investigation the sorption-desorption kinetics of 75 vol % ethanol/water solution by dimethacrylate-based dental resins and resin composites was studied in detail. The resins examined were made by light-curing of bisphenol A glycol dimethacrylate (Bis-GMA), triethylene glycol dimethacrylate (TEGDMA), urethane dimethacrylate (UDMA), bisphenol A ethoxylated dimethacrylate (Bis-EMA), and mixtures of these monomers. The resin composites were prepared from two commercial light-cured restorative materials (Z100 MP and Filtek Z250), the resin matrix of which is based on copolymers of the above-mentioned monomers. Ethanol/water sorption/desorption was examined in both equilibrium and dynamic conditions in two adjacent sorption-desorption cycles. For all the materials studied, it was found that the amount of ethanol/water sorbed or desorbed was always larger than the corresponding one reported in literature in case of water immersion. It was also observed that the chemical structure of the monomers used for the preparation of the resins directly affects the amount of solvent sorbed or desorbed, as well as sorption kinetics, while desorption rate was nearly unaffected. In the case of composites studied, it seems that the sorption/desorption process is not influenced much by the presence of filler. Furthermore, diffusion coefficients calculated for the resins were larger than those of the composites and were always higher during desorption than during sorption. Finally, an interesting finding concerning the rate of ethanol/water sorption was that all resins and composites followed Fickian diffusion kinetics during almost the whole sorption curve; however, during desorption the experimental data were overestimated by the theoretical model. Instead, it was found that a dual diffusion-relaxation model was able to accurately predict experimental data during the whole desorption curve. Kinetic relaxation parameters, together with diffusion coefficients, are reported for all resins and composites.
Collapse
Affiliation(s)
- Irini D Sideridou
- Laboratory of Organic Chemical Technology, Department of Chemistry, Aristotle University of Thessaloniki, GR 54124 Thessaloniki, Greece.
| | | | | |
Collapse
|
98
|
Wu G, Nie J. Synthesis and evaluation of ethylene glycol 3-diethylamino-propionate methacrylate as a polymerizable amine coinitiator for dental application. Dent Mater 2006; 23:623-9. [PMID: 16797689 DOI: 10.1016/j.dental.2006.03.020] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2005] [Revised: 03/07/2006] [Accepted: 03/09/2006] [Indexed: 11/22/2022]
Abstract
OBJECTIVE The primary objective of this study was to synthesize and characterize ethylene glycol 3-diethylamino-propionate methacrylate (EGDPM) as a polymerizable coinitiator to replace the commercial amine coinitiator. The 2,2-bis[4-(2-hydroxy-3-methacryloxypropoxy)phenyl]-propane (Bis-GMA) and triethylene glycol dimethylacrylate (TEGDMA) resin mixture was polymerized by camphorquinone/EGDPM initiator system under visible light irradiation. The mechanical properties, water sorption and solubility of cured samples were also evaluated. METHODS EGDPM was synthesized via Michael-Addition reaction and characterized using FTIR and 1H NMR spectroscopy. Photopolymerization kinetics of the dental resin mixtures were monitored by real-time IR (RTIR). The mechanical properties of cured samples were recorded by dynamic mechanical analyzer (DMA). And the water sorption and solubility of cured samples were detected according to ISO 4049. RESULTS Both the double bond conversion and the rate of polymerization of the resin mixtures increased as increasing the concentration of EGDPM but were lower than that of ethyl-4-dimethylaminobenzoate (EDMAB) and 2-(dimethylamine)ethyl methacrylate (DMEM) as a coinitiator at some concentration. When it served as diluent, the final double bond conversion was comparable to that of EDMAB, and the rate of polymerization was higher than that of DMEM. The modulus and T(g) of the cured samples were very close. Water sorption and solubility of the samples were almost the same except that of EGDPM as diluent. CONCLUSIONS EGDPM was synthesized by Michael-Addition reaction. It could be used as a potential coinitiator but not suitable as diluent for dental composite.
Collapse
Affiliation(s)
- Gangqiang Wu
- Key Laboratory of Biomedical Polymers of Ministry of Education, Department of Chemistry, Wuhan University, Wuhan 430072, PR China
| | | |
Collapse
|
99
|
Danesh G, Lippold C, Mischke KL, Varzideh B, Reinhardt KJ, Dammaschke T, Schäfer E. Polymerization characteristics of light- and auto-curing resins for individual splints. Dent Mater 2006; 22:426-33. [PMID: 16045980 DOI: 10.1016/j.dental.2005.04.032] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2004] [Accepted: 04/07/2005] [Indexed: 11/21/2022]
Abstract
OBJECTIVES The aim of this in vitro study was to assess different resins for occlusal splints regarding a number of polymerization characteristics. METHODS One autopolymerizing resin (Palapress) and four light-curing resins (Acrylight, Primosplint, Triad TranSheet Colorless and Pink) were tested for flexural strength, modulus of elasticity, water sorption, volumetric shrinkage, and conversion of double bonds. These resins were polymerized for 10 and 15 min in a light oven at frequencies between 320 and 400 nm or 400 and 500 nm, respectively. Data were treated statistically by ANOVA and by Scheffé test. RESULTS Concerning flexural strength and modulus of elasticity, Triad TranSheet Colorless showed significantly greater values than Primosplint and Palapress (p<0.05). The light curing resins Acrylight and Primosplint featured significantly higher water sorption when cured for 10 min compared to all other resins (p<0.05). Acrylight displayed significantly higher volumetric shrinkage and a higher quantity of remaining double bonds compared to all other light-curing resins (p<0.05). Primosplint, Triad TranSheet Colorless and Pink showed significantly lower shrinkage values than autopolymerizing Palapress (p<0.05). For all light curing resins, polishing of the samples resulted in a significantly lower quantity of remaining double bonds (p<0.05) compared to unpolished samples. SIGNIFICANCE With respect to the polymerization properties evaluated, the light-curing resins reached similar material properties to the autopolymerizing resin or even surpassed them. Light-curing resins seem to be suitable for the fabrication of occlusal splints and can been seen as an alternative to autopolymerizing polymethylmethacrylates.
Collapse
Affiliation(s)
- Gholamreza Danesh
- Department of Orthodontics, Dental School of Westfälische Wilhelms-University, Poliklinik für Kieferorthopädie, Waldeyerstr. 30, D-48149 Münster, Germany.
| | | | | | | | | | | | | |
Collapse
|
100
|
Ferracane JL. Hygroscopic and hydrolytic effects in dental polymer networks. Dent Mater 2006; 22:211-22. [PMID: 16087225 DOI: 10.1016/j.dental.2005.05.005] [Citation(s) in RCA: 801] [Impact Index Per Article: 44.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2005] [Accepted: 05/11/2005] [Indexed: 12/19/2022]
Abstract
OBJECTIVES The objective of this manuscript is to outline the factors associated with hygroscopic and hydrolytic effects in dental polymer networks, and to review the literature generated over the past thirty years or more in this area. METHODS Information was gathered from nearly 90 published articles or abstracts appearing in the dental and polymer literature. Studies were predominantly identified through a search of the PubMED database. RESULTS Studies were included that provided direct evidence for the uptake of solvent by a polymer network and its subsequent physical or chemical effect, or the loss of molecular species into solvents. An attempt was made to select articles that spanned the timeframe from approximately 1970 to today to ensure that most of the classic literature as well as the latest information was included. CONCLUSIONS Dental polymer networks have been shown to be susceptible to hygroscopic and hydrolytic effects to varying extents dependent upon their chemistry and structure. The importance of these effects on the clinical performance of polymer restoratives is largely unknown, though numerous investigators have alluded to the potential for reduced service lives. SIGNIFICANCE While the physical and mechanical properties of these materials may be significantly altered by the effects of solvent uptake and component elution, what may constitute the greatest concern is the short-term release of unreacted components and the long-term elution of degradation products in the oral cavity, both of which should be strongly considered during restorative material development.
Collapse
Affiliation(s)
- Jack L Ferracane
- Division of Biomaterials and Biomechanics, Department of Restorative Dentistry, Oregon Health & Science University, 611 S.W. Campus Drive, Portland, OR, USA.
| |
Collapse
|