Displaying publications 1 - 20 of 74 in total

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  1. Fulltext The assessment of surface roughness and microleakage of eroded tooth-colored dental restorative materials
    Hussein TA, Bakar WZ, Ghani ZA, Mohamad D
    J Conserv Dent, 2014 Nov;17(6):531-5.
    PMID: 25506139 DOI: 10.4103/0972-0707.144585
    To investigate the effect of acidic solution on surface roughness and microleakage of tooth-colored restorative materials.
    Matched MeSH terms: Dental Materials
  2. The use of prefabricated endosseous blad-vent implants
    Vajda TT
    Dent J Malaysia Singapore, 1971 Apr;11(1):5-8.
    PMID: 5288002
    Matched MeSH terms: Dental Materials
  3. 3D Finite element analysis of functionally graded multilayered dental ceramic cores
    Al-Maqtari AA, Razak AA, Hamdi M
    Dent Mater J, 2014;33(4):458-65.
    PMID: 25087658
    This study aimed at investigating and establishing stress distributions in graded multilayered zirconia/alumina ceramic cores and at veneer-core-cement-dentin interfaces, using finite element analysis (FEA), to facilitate the structural design of ceramic cores through computer modeling. An intact maxillary premolar was digitized using CT scanning. An imaging software, Mimics, was used to reconstruct 3D models based on computed tomography (CT) data saved in DICOM format. Eight different 3D models were created for FEA, where each 3D model was meshed and its bottom boundaries constrained. A static load was applied in the oblique direction. The materials were assumed to be isotropic and homogeneous. Highest von Mises stress values were found in areas directly below the load application point, and stress gradually decreased in occlusal loading direction from the external surface toward the dentin. Stress levels occurring at veneer-ceramic core-cement-dentin interfaces were shown to be lower in multilayered ceramic cores than in single-layer models.
    Matched MeSH terms: Dental Materials*
  4. Surface Degradation of Ion-releasing Restorative Materials With Cariogenic Challenge
    Ibrahim H, Aziz AA, Yahya NA, Yap AU
    Oper Dent, 2024 Mar 01;49(2):178-188.
    PMID: 38196082 DOI: 10.2341/23-038-L
    This study examined the influence of cariogenic environments on the surface roughness of ion-releasing restorative materials (IRMs). Custom-made stainless steel molds with holes of 5 mm × 2mm were used to fabricate 60 disc-shaped specimens of each of the following materials: Activa Bioactive (AV), Beautifil Bulk Restorative (BB), Cention N (Bulk-fill) (CN), and Filtek Z350XT (FZ) (Control). Baseline surface roughness (Ra) measurements were obtained using an optical 3D measurement machine (Alicona Imaging GmbH, Graz, Austria). The specimens were then randomly divided into five subgroups (n=12) and exposed to 10 ml of the following mediums at 37°C: distilled water (DW), demineralization solution (DM), remineralization solution (RM), pH cycling (PC) and air (AR) (control). Ra measurements were again recorded after one week and one month, followed by statistical evaluations with two-way analysis of variance (ANOVA) to determine interactions between materials and mediums. One-way ANOVA and post hoc Games Howell tests were performed for intergroup comparisons at a significance level of 0.05. Mean Ra values ranged from 0.085 ± 0.004 (µm) to 0.198 ± 0.001 µm for the various material-medium combinations. All IRMs showed significant differences in Ra values after exposure to the aqueous mediums. The smoothest surfaces were observed in the AR for all materials. When comparing materials, AV presented the roughest surfaces for all mediums. All IRM materials showed increased surface roughness over time in all cariogenic environments but were below the threshold value for bacterial adhesion, except for AV 1-month post immersion with pH cycling. Therefore, besides AV, the surface roughness of IRMs did not deteriorate to an extent that it is clinically relevant.
    Matched MeSH terms: Dental Materials*
  5. Fulltext Microleakage Testing
    Gonzalez, M.A.G., Kasim, N.H.A., Aziz, R.A.
    Ann Dent, 1997;4(1):-.
    MyJurnal
    Microleakage testing has been used to determine the possible clinical performance of a restorative material. Many microleakage testing materials have been developed and performed through the years. There has been no agreement as to which testing methodology would give the most accurate results. Attempts have been made to simulate the oral conditions and to give a more quantitative representation of micro leakage. The different micro leakage testing methodologies are presented in this paper.
    Matched MeSH terms: Dental Materials
  6. Flexural properties of poly(methyl methacrylate) resin reinforced with oil palm empty fruit bunch fibers: a preliminary finding
    John J, Ann Mani S, Palaniswamy K, Ramanathan A, Razak AA
    J Prosthodont, 2015 Apr;24(3):233-8.
    PMID: 24976147 DOI: 10.1111/jopr.12191
    PURPOSE: The purpose of this preliminary study was to evaluate the flexural properties of poly(methyl methacrylate) (PMMA) reinforced with oil palm empty fruit bunch (OPEFB) fiber.

    MATERIALS AND METHODS: The flexural strength and flexural modulus of three OPEFB fiber-reinforced PMMA were compared with a conventional and a commercially available reinforced PMMA. The three test groups included OPEFB fibers of 0.5 mm thickness, 2.0 mm thickness, and OPEFB cellulose.

    RESULTS: All test group specimens demonstrated improved flexural strength and flexural modulus over conventional PMMA. Reinforcement with OPEFB cellulose showed the highest mean flexural strength and flexural modulus, which were statistically significant when compared to the conventional and commercially reinforced PMMA used in this study. OPEFB fiber in the form of cellulose and 0.5 mm thickness fiber significantly improved flexural strength and flexural modulus of conventional PMMA resin. Further investigation on the properties of PMMA reinforced with OPEFB cellulose is warranted.

    CONCLUSIONS: Natural OPEFB fibers, especially OPEFB in cellulose form, can be considered a viable alternative to existing commercially available synthetic fiber reinforced PMMA resin.

    Matched MeSH terms: Dental Materials/chemistry
  7. The use of Weibull statistics in mechanical testing of brittle dental materials
    Ibrahim WM, McCabe JF
    J Nihon Univ Sch Dent, 1993 Dec;35(4):225-9.
    PMID: 8158281
    The mean strength that has traditionally been taken as a measurement of the strength of a material does not reflect the true strength, and therefore it cannot be used as a design parameter. This explains why many brittle materials fail at unpredictable stress, either below or above the mean strength. By using Weibull statistics, the prediction and assessment of strength can be made more sensibly. The performance of a material can be predicted by considering a stress at a lower level of failure probability.
    Matched MeSH terms: Dental Materials*
  8. Fulltext Review of titanate coupling agents and their application for dental composite fabrication
    Elshereksi NW, Ghazali M, Muchtar A, Azhari CH
    Dent Mater J, 2017 Sep 26;36(5):539-552.
    PMID: 28652551 DOI: 10.4012/dmj.2016-014
    Silane is a dominant coupler that is widely used in dentistry to promote adhesion among the components of dental composites. Silica-based fillers can be easily silanized because of their similarly ordered structure. However, silane is hydrolytically degraded in the aqueous oral environment and inefficiently bonds to non-silica fillers. Thus, the development of hydrolytically stable dental composites is an important objective in the research on dental materials. Titanate coupling agents (TCAs) exhibit satisfactory interfacial bonding, enhanced homogeneous filler dispersion, and improved mechanical properties of the composites. Titanates also provide superior hydrolytic stability in wet environments, which should be considered in fabricating dental composites. The addition of a small amount of titanates can improve the resistance of the composites to moisture. This paper reviews the effects of the instability of silanes in moisture on the performance of dental composites and presents TCAs as alternative couplers to silanes for fabricating dental composites.
    Matched MeSH terms: Dental Materials*
  9. Fulltext Mechanical Properties of Longitudinal Basalt/Woven-Glass-Fiber-reinforced Unsaturated Polyester-Resin Hybrid Composites
    Sapuan SM, Aulia HS, Ilyas RA, Atiqah A, Dele-Afolabi TT, Nurazzi MN, et al.
    Polymers (Basel), 2020 Sep 27;12(10).
    PMID: 32992450 DOI: 10.3390/polym12102211
    This work represents a study to investigate the mechanical properties of longitudinal basalt/woven-glass-fiber-reinforced unsaturated polyester-resin hybrid composites. The hybridization of basalt and glass fiber enhanced the mechanical properties of hybrid composites. The unsaturated polyester resin (UP), basalt (B) and glass fibers (GF) were fabricated using the hand lay-up method in six formulations (UP, GF, B7.5/G22.5, B15/G15, B22.5/G7.5 and B) to produce the composites, respectively. This study showed that the addition of basalt to glass-fiber-reinforced unsaturated polyester resin increased its density, tensile and flexural properties. The tensile strength of the B22.5/G7.5 hybrid composites increased by 213.92 MPa compared to neat UP, which was 8.14 MPa. Scanning electron microscopy analysis was used to observe the fracture mode and fiber pullout of the hybrid composites.
    Matched MeSH terms: Dental Materials
  10. Correction: Functionalized fluorescent terephthalate monomers and their attempted polyester formation
    Choo YSL, Giamberini M, Reina JA, Waddell PG, Benniston AC
    Org Biomol Chem, 2020 Nov 25;18(45):9316.
    PMID: 33179703 DOI: 10.1039/d0ob90154g
    Correction for 'Functionalized fluorescent terephthalate monomers and their attempted polyester formation' by Yvonne S. L. Choo et al., Org. Biomol. Chem., 2020, 18, 8735-8745, DOI: 10.1039/D0OB01533D.
    Matched MeSH terms: Biomedical and Dental Materials
  11. Incorporation of wollastonite bioactive ceramic with titanium for medical applications: An overview
    Zakaria MY, Sulong AB, Muhamad N, Raza MR, Ramli MI
    Mater Sci Eng C Mater Biol Appl, 2019 Apr;97:884-895.
    PMID: 30678979 DOI: 10.1016/j.msec.2018.12.056
    Titanium-ceramic composites are potential implant material candidates because of their unique mechanical properties and biocompatibility. This review focused on the latest advancement in processing of titanium-ceramic materials. Previously, titanium-ceramic incorporated using different coating techniques, i.e., plasma spraying and electrophoretic depositions, to enhance the biocompatibility of the implants. A major drawback in these coating methods is the growth of tissue at only the surface of the composite and might peel off over time. Recently, metal-ceramic composite was introduced via powder metallurgy method such as powder injection moulding. A porous structure can be obtained via powder metallurgy. Producing a porous titanium-ceramic structure would improve the mechanical properties, biocompatibility and tissue growth within the structure. Hence, further research needed to be done by considering the potential of powder injection moulding method which offer lower costs and more complex shapes for future implant.
    Matched MeSH terms: Dental Materials
  12. Fulltext Hybrid composites: study on un-treated kenaf/glass fibre properties
    Abdul Malek Ya’acob, Azhar Abu Bakar, Hanafi Ismail, Khairul Zaman Dahlan
    Pertanika Journal of Science & Technology, 2011;19(2):373-381.
    MyJurnal
    A hybrid composite consisting of untreated kenaf fibre and glass fibre was investigated by varying the fibre glass weight ratios and using interply fabrication method. The expected results were to have better composite performance in terms of its toughness and impact strength as a comparison between the hybrid (kenaf/E-glass fibre composites) and E-GF composites alone. For the purpose of this study, all the samples were prepared using typical sample preparation. Results show that the incorporation of E–glass fibre resulted in brittle failure and a higher amount of E-Glass fibre with low percentage of kenaf fibre causing high strength, low ductile, and low toughness behaviours.
    Matched MeSH terms: Dental Materials
  13. Fulltext Influence of dentist gender and clinical experience on the selection of posterior restorative dental material: a preliminary study
    Norazlina Mohammad, Abdul Azim Asy Abdul Aziz, Aimi Amalina Ahmad, Azlan Jaafar, Aws H Ali Al-Kadhim
    International Medical Journal Malaysia, 2017;16(21):51-51.
    MyJurnal
    Dentist-related factors are one of the major influences on the material selection for
    restoration of carious and non-carious tooth surface loss. There were conflicting results regarding
    the impact of dentists' gender and age or length of clinical experience on restorative material
    selection for posterior dentition. The aims of this study were to determine the influence of gender
    and clinical experience on posterior restorative material selection among private dental
    practitioner in Malaysia. (Copied from article).
    Matched MeSH terms: Dental Materials
  14. Fulltext Hole size effects on the open hole tensile properties of Woven Kevlar-Glass Fibre hybrid composite laminates
    Norazean Shaari, Aidah Jumahat
    Pertanika Journal of Science & Technology, 2017;25(107):309-318.
    MyJurnal
    The effects of hole size on open hole tensile properties of Kevlar-glass fibre hybrid composite laminates were thoroughly investigated in this work. Woven Kevlar/glass fibre epoxy composite laminates were fabricated using hand lay-up and vacuum bagging technique. Specimens of five different hole size (1 mm, 4 mm, 6 mm, 8 mm and 12 mm) were carefully prepared before the tensile test was performed according to ASTM D5766. Results indicated that hybridizing Kevlar to glass fibres improved tensile strength and failure strain of hybrid composite specimen. In addition, increasing the hole size reduced strength retention of the hybrid specimen from 96% for 1 mm hole size to 62% and 44% for 6 mm and 12 mm, respectively. Fractography analysis showed that several types of failure mechanisms were observed such as brittle failure, ductile failure, fibre breakage, delamination and fibre-matrix splitting. It is concluded that as hole size increased, failure behaviour changed from a matrix dominated failure mode to a fibre-dominated failure mode.
    Matched MeSH terms: Dental Materials
  15. Fulltext Influence of Secondary Reinforcement on Behaviour of Corbels with Various Types of High-Performance Fiber-Reinforced Cementitious Composites
    Md Zin N, Al-Fakih A, Nikbakht E, Teo W, Anwar Gad M
    Materials (Basel), 2019 Dec 11;12(24).
    PMID: 31835775 DOI: 10.3390/ma12244159
    An experimental study is conducted to determine the influence of secondary reinforcement on the behaviour of corbels fabricated with three different types of high-performance fiber-reinforced cementitious composites, including engineered cementitious concrete (ECC); high-performance steel fiber-reinforced composite (HPSFRC); and hybrid fiber-reinforced composite (HyFRC). Two shear span-to-depth ratios (a/d = 0.75 and 1.0) are explored. The mechanical properties of the composites in terms of tensile, compressive, and flexural strengths are investigated. Next, the structural behaviour of the high-performance cementitious composite corbels in terms of ultimate load capacity, ductility, and failure modes under the three-point bending test are investigated. The secondary reinforcement is proven to significantly affect stiffness and ultimately load capacity of all three high-performance composite corbels with an aspect ratio of 0.75. However, the secondary reinforcement was more impactful for the HPSFRC corbels, with 51% increase of ultimate strength. Moreover, in terms of damage, fewer cracks occurred in ECC corbels. HPSFRC corbels displayed the highest level of ductility and deformation capacity compared to the other specimens. The results were comparatively analyzed against the predicted results using truss and plastic truss models which provided relatively reliable shear strength.
    Matched MeSH terms: Dental Materials
  16. Fracture toughness and impact strength of hollow epoxy particles-toughened polyester composite
    Low L, Abu Bakar A
    Sains Malaysiana, 2013;42:443-448.
    Hollow epoxy particles (HEP) serving as reinforcing fillers were prepared using the water-based emulsion method in this study. HEP was incorporated into the polyester matrix at various loading, ranging from 0 wt% to 9 wt%, to toughen the brittle polyester thermoset. The polyester composites were prepared using the casting technique. The fracture toughness and impact strength of the polyester composites increased with increasing the HEP loading up to 5 wt%, after which
    there was a drop. The improvement in fracture toughness and impact strength is attributed to the good polymer-filler interaction. This finding was further supported by the scanning electron micrograph, in which it was shown that the polyester resin was interlocked into the pore regions of the HEP filler. The reduction in fracture toughness and impact strength of the polyester composite were believed to be attributed to the filler agglomeration. This filler-filler interaction would create stress concentration areas and eventually weakened the interfacial adhesion between the polymer matrix and the filler particles. Hence, lower fracture toughness and impact strength of the highly HEP-filled polyester composites (above 5 wt%) were detected.
    Matched MeSH terms: Dental Materials
  17. Multi-walled carbon nanotubes/woven kenaf fabric-reinforced epoxy laminated composites
    Nurul Hidayah Ismail, Mohd Hafizi Mohamad, Mariatti Jaafar
    Sains Malaysiana, 2018;47:563-569.
    This study was carried out to investigate the effect of adding 1 vol% of multi-walled carbon nanotubes (MWCNT) into
    woven kenaf/epoxy laminated composites on their flexural properties and to compare between two techniques used to
    incorporate MWCNT into the composite which are spraying and solution techniques. Furthermore, the effect of MWCNT
    addition in woven glass/woven kenaf/epoxy hybrid composites at the same filler concentration on the flexural properties
    were also investigated. All the laminated composites with and without MWCNT were fabricated using vacuum bagging
    method. The flexural properties of the composite samples with and without MWCNT were evaluated by applying threepoint
    bending test. The results were supported by morphological observation. It was found that the addition of MWCNT
    using both spraying and solution techniques reduced the flexural strength and flexural modulus of MWCNT/woven kenaf/
    epoxy composites, with obvious reduction trend was shown by former technique. The morphological observation of the
    composites fracture surface showed that delamination failure occurred in MWCNT/woven kenaf/epoxy laminated composite
    prepared by spraying technique. Further investigation on hybrid composites showed that MWCNT/woven glass/woven
    kenaf/epoxy laminated hybrid composites exhibited significant improvement in the flexural properties.
    Matched MeSH terms: Dental Materials
  18. Fulltext Effect of Silica Nanoparticles in Kenaf Reinforced Epoxy: Flexural and compressive properties
    Bajuri, F., Mazlan, N., Ishak, M.R.
    Pertanika Journal of Science & Technology, 2017;25(3):1029-1038.
    MyJurnal
    Kenaf natural fibre is used as a sustainable form of material to reinforce polymeric composite. However, natural fibres usually do not perform as well as synthetic fibres. Silica nanoparticle is a material with high surface area and its high interfacial interaction with the matrix results in its improvement. In this research, silica nanoparticles were introduced into epoxy resin as a filler material to improve the mechanical properties of the kenaf-reinforced epoxy. They were dispersed into the epoxy using a homogeniser at 3000 rpm for 10 minutes. The composites were fabricated by spreading the silica filled epoxy evenly onto the kenaf mat before hot pressing the resin wet kenaf mat. The results show for flexural properties, composites with higher fibre and silica volume content generally had better properties with specimen 601 (60 vol% kenaf and1 vol% silica) having the highest strength at 68.9 MPa. Compressive properties were erratic with specimen 201 (20 vol% kenaf and 1 vol% silica) having the highest strength at 53.6 MPa.
    Matched MeSH terms: Dental Materials
  19. Flexural Properties of Contemporary Bioactive Restorative Materials: Effect of Environmental pH
    Ong J, Yap AU, Abdul Aziz A, Yahya NA
    Oper Dent, 2023 Jan 01;48(1):90-97.
    PMID: 36445974 DOI: 10.2341/21-202-L
    This study investigated the effects of environmental pH on the flexural properties of ion-releasing restorative materials (IRMs), including giomer (Beautifil-Bulk Restorative - BB), alkasite (Cention N - CN), bioactive composite (Activa - AB) and resin-modified glass ionomer (Riva Light Cure -RV) restoratives. A bio-inert resin-based composite (Filtek Bulk-fill Posterior - FB) served as the control. Stainless steel molds were used to fabricate 40 beam-shaped specimens (12mm × 2mm × 2mm) for each material. The specimens were finished, measured, and randomly distributed into four groups (n=10) and immersed in aqueous solutions of pH 3.0, pH 5.0, pH 6.8, and pH 10.0 at 37°C for 28 days. Specimens were then subjected to a uniaxial three-point bending flexural test with a load cell of 5 KN and a fixed deformation rate of 0.5 mm/min until fracture occurred. Flexural modulus and strength were statistically analyzed using analysis of variance/Dunnet T3's test (p=0.05). Mean flexural modulus varied from (2.40±0.41 to 9.65±1.21 GPa), while mean flexural strength ranged from (21.56±2.78 to 163.86±13.13 MPa). Significant differences in flexural properties were observed among the various pH values and materials. All materials immersed in artificial saliva (pH 6.8) presented the highest flexural properties, except AB. The flexural strength of AB was significantly better when exposed to acidic environments. FB had better flexural properties than IRMs after exposure to a range of environmental pH values.
    Matched MeSH terms: Dental Materials
  20. Biaxial flexural strength of Turkom-Cera core compared to two other all-ceramic systems
    Al-Makramani BM, Razak AA, Abu-Hassan MI
    J Appl Oral Sci, 2010 Dec;18(6):607-12.
    PMID: 21308292
    Advances in all-ceramic systems have established predictable means of providing metal-free aesthetic and biocompatible materials. These materials must have sufficient strength to be a practical treatment alternative for the fabrication of crowns and fixed partial dentures.

    OBJECTIVES: The aim of this study was to compare the biaxial flexural strength of three core ceramic materials.

    MATERIAL AND METHODS: Three groups of 10 disc-shaped specimens (16 mm diameter x 1.2 mm thickness - in accordance with ISO-6872, 1995) were made from the following ceramic materials: Turkom-Cera Fused Alumina [(Turkom-Ceramic (M) Sdn Bhd, Puchong, Selangor, Malaysia)], In-Ceram (Vita Zahnfabrik, Bad Säckingen, Baden-Württemberg, Germany) and Vitadur-N (Vita Zahnfabrik, Bad Säckingen, Baden-Württemberg, Germany), which were sintered according to the manufacturer's recommendations. The specimens were subjected to biaxial flexural strength test in an universal testing machine at a crosshead speed of 0.5 mm/min. The definitive fracture load was recorded for each specimen and the biaxial flexural strength was calculated from an equation in accordance with ISO-6872.

    RESULTS: The mean biaxial flexural strength values were: Turkom-Cera: 506.8 ± 87.01 MPa, In-Ceram: 347.4 ± 28.83 MPa and Vitadur-N: 128.7 ± 12.72 MPa. The results were analyzed by the Levene's test and Dunnett's T3 post-hoc test (SPSS software V11.5.0 for Windows, SPSS, Chicago, IL, USA ) at a preset significance level of 5% because of unequal group variances (P<0.001). There was statistically significant difference between the three core ceramics (P<0.05). Turkom-Cera showed the highest biaxial flexural strength, followed by In-Ceram and Vitadur-N.

    CONCLUSIONS: Turkom-Cera core had significantly higher flexural strength than In-Ceram and Vitadur-N ceramic core materials.

    Matched MeSH terms: Dental Materials/chemistry*
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