Displaying publications 1 - 20 of 51 in total

  1. Alireza Jahani, Masrah Azrifah Azmi Murad, Md. Nasir Sulaiman, Hasan Selamat
    Similarity measurement is a critical component in any case-based reasoning (CBR) system. CBR is
    a superior technique for solving new problems based on previous experiences. Main assumption in
    CBR relies on the hypothesis that states similar problems should have similar solutions. This paper
    describes a comparative analysis on several commonly used similarity measures (Canberra, Clark, and Normalized Euclidean distance) in retrieving phase of the case-based reasoning approach to facilitate supplier selection. In addition, the proposed agent-based supplier selection framework was designed to use customer’s defined weights to evaluate the price, volume, quality grade, and delivery date of supply materials, and also provide them with alternative products which are closest to their first order if it was out of stock. Finally, based on the proposed framework, a numerical example of the used approach is illustrated.
    Matched MeSH terms: Resin Cements
  2. Reza F, Lim SP
    J Conserv Dent, 2012 Apr;15(2):123-6.
    PMID: 22557808 DOI: 10.4103/0972-0707.94576
    To compare push-out bond strength between self-cured and dual-cured resin cement using a titanium post.
    Matched MeSH terms: Resin Cements
  3. Ab-Ghani Z, Jaafar W, Foo SF, Ariffin Z, Mohamad D
    J Conserv Dent, 2015 Sep-Oct;18(5):355-9.
    PMID: 26430296 DOI: 10.4103/0972-0707.164028
    To evaluate the shear bond strength between the dentin substrate and computer-aided design and computer-aided manufacturing feldspathic ceramic and nano resin ceramics blocks cemented with resin cement.
    Matched MeSH terms: Resin Cements
  4. Razak, A.A.A., Harrison, A., Alani, A.A.
    Ann Dent, 1996;3(1):-.
    The effect of filler content and storage conditions such as drying, storing in water and thermal cycling on linear dimensional changes were investigated and evaluated. The dimensional accuracy studies were performed using a specific designed mould and a coordinate measuring machine. The findings gave support to the view that tiller content is an important factor influencing the physical and mechanical properties of the composite inlay material. The higher tiller content gave less polymerization shrinkage. The greatest linear shrinkage recorded was 0.79 %. The average linear shrinkage (in air, water and thermal cycling) for 79 % filler Prisma AP.H was 0.33 %, for 65 % tiller Prisma AP.H was 0.35 % and for 50 % filler Prisma AP.H was 0.42 %. Generally, dimensional changes was greatest when stored dry. This was followed by materials which were thermal cycled. The least dimensional change recorded was when the materials were stored in water.
    Matched MeSH terms: Resin Cements
  5. Udin, W. S., Ahmad, A., Ismail, Z.
    In recent years image acquisition in close range photogrammetry relies on digital sensors such as digital cameras, video cameras, CCD cameras etc that are not specifically designed for photogrammetry. This study is performed to evaluate the compatibility of the digital metric camera and non-metric camera for the purpose of mapping meandering flume, using close range photogrammetric technique and further, to determine the accuracy that could be achieved using such a technique. The meandering flume provides an opportunity to conduct an experimental study in a controlled environment. In this study, the digital images of the whole meandering flume were acquired using a compact digital camera - Nikon Coolpix S560, a Single Lens Reflex (SLR) Nikon D60 and also a metric digital camera Rollei D30. A series of digital images were acquired to cover the whole meandering flume. Secondary data of ground control points (GCP) and check points (CP), established using the Total Station technique, was used. The digital camera was calibrated and the recovered camera calibration parameters were then used in the processing of digital images. In processing the digital images, digital photogrammetric software was used for processes such as aerial triangulation, stereo compilation, generation of digital elevation model (DEM) and generation of orthophoto. The whole process was successfully performed and the output produced in the form of orthophoto. The research output is then evaluated for planimetry and vertical accuracy using root mean square error (RMSE). Based on the analysis, sub-meter accuracy is obtained. It can be concluded that the differences between the different types of digital camera are small . As a conclusion, this study proves that close range photogrammetry technique can be used for mapping meandering flume using both the metric digital camera and non-metric digital camera.
    Matched MeSH terms: Resin Cements
  6. Mardani A, Streimikiene D, Cavallaro F, Loganathan N, Khoshnoudi M
    Sci Total Environ, 2019 Feb 01;649:31-49.
    PMID: 30170214 DOI: 10.1016/j.scitotenv.2018.08.229
    Understanding the nexus CO2 emissions and economic growth helps economies in formulating energy policies and developing energy resources in sustainable ways. Although during recent years, numerous of the previous studies have been very thoroughly investigated the nexus between economic growth and CO2 emissions, there is a lack of research regarding the qualitative systematic review and meta-analysis in these areas. The main purpose of this review paper is to present the comprehensive overview of the relationship between CO2 emissions and economic growth. In this regard, the Web of Science database has been chosen and a qualitative systematic and meta-analysis method which called "Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA)" has been proposed. Therefore, a review of 175 published articles appearing in 55 scholarly international journals between 1995 and 2017 has been achieved to reach a broad review of the nexus between economic growth and CO2 emissions with other indicators. Consequently, the selected articles have been categorized by the author name, the year of publication, data duration, types of techniques, data analysis method, the name of indicators, country, scope (individual country and multi-countries), journals, results, and outcome in which they appeared. The results of this paper demonstrated that the nexus between CO2 emissions and economic growth gives reasons for policy options that have to reduce emissions by imposing limiting factors on economic growth as well. Given the fact that bidirectional causality exists, as far as economic growth increases or decreases, further CO2 emissions are stimulated in higher or lower levels and consequently, a potential reduction of the emissions should have an adverse influence on economic growth.
    Matched MeSH terms: Resin Cements
  7. Hui KH, Ooi CS, Lim MH, Leong MS, Al-Obaidi SM
    PLoS One, 2017;12(12):e0189143.
    PMID: 29261689 DOI: 10.1371/journal.pone.0189143
    A major issue of machinery fault diagnosis using vibration signals is that it is over-reliant on personnel knowledge and experience in interpreting the signal. Thus, machine learning has been adapted for machinery fault diagnosis. The quantity and quality of the input features, however, influence the fault classification performance. Feature selection plays a vital role in selecting the most representative feature subset for the machine learning algorithm. In contrast, the trade-off relationship between capability when selecting the best feature subset and computational effort is inevitable in the wrapper-based feature selection (WFS) method. This paper proposes an improved WFS technique before integration with a support vector machine (SVM) model classifier as a complete fault diagnosis system for a rolling element bearing case study. The bearing vibration dataset made available by the Case Western Reserve University Bearing Data Centre was executed using the proposed WFS and its performance has been analysed and discussed. The results reveal that the proposed WFS secures the best feature subset with a lower computational effort by eliminating the redundancy of re-evaluation. The proposed WFS has therefore been found to be capable and efficient to carry out feature selection tasks.
    Matched MeSH terms: Resin Cements
  8. Udomratn, Pichet, Deva, M. Parameshvara
    ASEAN Journal of Psychiatry, 2007;8(1):35-39.
    The Association of South East Asian Nations (ASEAN) was formed in 1971, and 10 years
    later the ASEAN Federation for Psychiatry and Mental Health (AFPMH) was formally
    launched. This article reviews the objectives, structure, membership, and the principles of
    rotational participation and responsibility of the AFPMH, which has just celebrated its jubilee anniversary last year. Twenty-six years have passed, and the AFPMH has achieved many successes, including the congress, which is currently held every two years, and the ASEAN Journal of Psychiatry, which may be the oldest regional journal in the Asian continent. The bright future of ASEAN psychiatry is expected but relies heavily on the unity and commitment of all individual psychiatric associations within the ASEAN.
    Matched MeSH terms: Resin Cements
  9. Himratul-Aznita, W.H.
    Ann Dent, 2001;8(1):-.
    Until today there are still a high percentage of oral microorganisms have not been identified due to inability to isolate using the cultural method. However, identification of uncultivable microorganisms associated with disease will permits clinicians for a more accurate diagnosis, treatment and preventive measures. Unculturable microorganisms are also involved in disease and may account for treatment failure since their susceptibility to antimicrobial agents would be unknown. Thus, the opportunity for a rational approach to the treatment of disease relies on the state of knowledge concerning its aetiology and pathogenesis. Recently developed molecular methods have made it possible to characterise mixed microflora in their entirety, including the substantial numbers of unculturable bacteria. The development of rapid molecular methods like PCR provides a reliable identification of unculturable microorganisms. This paper will review the current literature regarding the PCR techniques used to identify uncultivable oral microflora.
    Matched MeSH terms: Resin Cements
  10. Ahmed T, Rahman NA, Alam MK
    Eur J Dent, 2018 10 30;12(4):602-609.
    PMID: 30369810 DOI: 10.4103/ejd.ejd_22_18
    The aim of this study was to systematically review the available studies measuring the bond strength of orthodontic bracket-adhesive system under different experimental conditions in vivo. Literature search was performed in four different databases: PubMed, Web of Science, Cochrane, and Scopus using the keywords - bond strength, orthodontic brackets, bracket-adhesive, and in vivo. A total of six full-text articles were selected based on the inclusion and exclusion criteria of our study after a careful assessment by the two independent reviewers. Data selection was performed by following PRISMA 2009 guidelines. Five of the selected studies were clinical trials; one study was a randomized clinical trial. From each of the selected articles, the following data were extracted - number of samples, with the type of tooth involved materials under experiment methods of measurement, the time interval between bonding and debonding orthodontic brackets, mode of force application, and the bond strength results with the overall outcome. The methodological quality assessment of each article was done by the modified Downs and Black checklist method. The qualitative analyses were done by two independent reviewers. Conflicting issues were resolved in a consensus meeting by consulting the third reviewer (MKA). Meta-analysis could not be performed due to the lack of homogenous study results. The review reached no real conclusion apart from the lack of efforts to clinically evaluate the bonding efficiency of a wide range of orthodontic bracket-adhesive systems in terms of debonding force compared to laboratory-based in vitro and ex vivo studies.
    Matched MeSH terms: Resin Cements
  11. Abdullah JM
    Malays J Med Sci, 2014 Dec;21(Spec Issue):1-5.
    PMID: 25941457
    The Malaysian Journal of Medical Sciences and the Orient Neuron Nexus have amalgated to publish a yearly special issue based on neuro- and brain sciences. This will hopefully improve the quality of peer-reviewed manuscripts in the field of fundamental, applied, and clinical neuroscience and brain science from Asian countries. One focus of the Universiti Sains Malaysia is to strengthen neuroscience and brain science, especially in the field of neuroinformatics.
    Matched MeSH terms: Resin Cements
  12. Noor Sam A, Asma A
    Sains Malaysiana, 2012;41:1051-1056.
    A good adhesive is an important factor to consider in orthodontic bonding. Frequent bracket failure prolongs treatment duration and causes inconvenience to patient and operator. This study aimed to compare the effectiveness of two bonding agents, i.e. the self etching primer (SEP) and the conventional etch and bond (CEB) by monitoring the incidence, time and
    sites of bracket failure. Eighty orthodontic patients were recruited after informed consent were obtained. A randomized split mouth technique was used where one side was bonded with CEB agent, while the other side was bonded using SEP agent. All bonded brackets were examined every 4 weeks for 20 months. Incidence of bracket failure was noted and
    comparison between the two groups was done using paired t-test. Time and frequent site of failure were also assessed. Out of 1314 brackets, only 33 brackets were debonded with 16 from SEP group and 17 from CEB group which statistically insignificant (p>0.05). Almost 55% of bracket failure occurred during the first 3 months after bonding for both adhesives
    with lower premolars was most the frequent site to fail in both adhesives (39.4%). Bracket bonded on the left side failed significantly compared to the right side. In conclusion, both self-etching primer and conventional acid-etch bonding agents are equally effective in retaining brackets clinically. Bracket failure mostly occurres during the first 3 months after bonding. The premolar brackets and the left side are mostly debonded when compared to other sites.
    Matched MeSH terms: Resin Cements
  13. Santini A, Tiu SH, McGuinness NJ, Aldossary MS
    J Orthod, 2016 Sep;43(3):193-201.
    PMID: 27487476 DOI: 10.1080/14653125.2016.1205310
    OBJECTIVE: To evaluate the total light energy (TLE) transmission through three types of ceramic brackets with, bracket alone and with the addition of orthodontic adhesive, at different exposure durations, and to compare the microhardness of the cured adhesive.

    MATERIALS AND METHODS: Three different makes of ceramic brackets, Pure Sapphire(M), Clarity™ ADVANCED(P) and Dual Ceramic(P) were used. Eighteen specimens of each make were prepared and allocated to three groups (n = 6). MARC(®)-resin calibrator was used to determine the light curing unit (LCU) tip irradiance (mW/cm(2)) and TLE (J/cm(2)) transmitted through the ceramic brackets, and through ceramic bracket plus Transbond™ XT Light Cure Adhesive, for 5, 10 and 20 s. Vickers-hardness values at the bottom of the cured adhesive were determined. Statistical analysis used one-way analysis of variance (ANOVA); P = 0.05.

    RESULTS: TLE transmission rose significantly among all samples with increasing exposure durations. TLE reaching the adhesive- enamel interface was less than 10 J/cm(2), and through monocrystalline and polycrystalline ceramic brackets was significantly different (P 

    Matched MeSH terms: Resin Cements
  14. SH, Ku, YS, Tan, Yahya NA
    Ann Dent, 2014;21(1):25-32.
    The study aimed to evaluate the quality of the hybrid
    layer form by three different adhesive systems. Class V
    cavities were prepared on the buccal surface of fourty
    extracted human premolars. The prepared teeth were
    randomly assigned into four groups according to the
    adhesive system and application mode. The systems
    were: Optibond S (OS, total-etch); Optibond Versa (OV,
    two-bottles, self-etch); Single Bond Universal (SBU,
    one-bottle, self-etch) and Single Bond Universal with
    etchant (SBU + etchant). All cavities were restored with
    composite (Filtek Z350XT). The samples were sectioned,
    polished and pretreated to remove minerals, protein
    and water prior to SEM evaluation. From the images,
    thickness of the hybrid layers was measured. Present of
    resin tags and adaptation failure were also recorded. The
    data obtained were analyzed using ANOVA, Dunnett’s
    T3, Kruskal-Wallis and Mann-Whitney tests. OS group
    showed the highest average hybrid layer thickness (4.34
    µm), followed by SBU + etchant (3.06 µm), OV (1.91 µm)
    and SBU (0.95 µm). Both adhesive and cohesive failures
    were observed in SBU group. Present of prominent resin
    tags were seen in both OS and OV groups. In conclusion,
    all the investigated adhesive systems were able to perform
    distinguishable actions as shown in micro-morphological
    alteration and hybrid layer thickness. Two-bottles, selfetch
    adhesive (OV) was proven to produce negligible
    adaptation failure compared to other adhesive systems in
    the present study. Combined all-in-one adhesive (SBU)
    was found to render a superior bonding performance in
    total-etch mode comparing to self-etch mode.
    Matched MeSH terms: Resin Cements
  15. Radzi, Z., Yahya, N.A., Kasim, N.H.A., Ismail, N.H., Ismail, N.A., Zamzam, N
    Ann Dent, 2006;13(1):18-23.
    Introduction: Owing to the variety of materials and methods employed, comparison of the results and findings from bonding studies is difficult. Until recently, several types of teeth have been used in published research papers as a substrate in orthodontic bonding research including bovine incisors, fresh and rebonded human premolars. Objectives: The purpose of this study was to compare the shear bond strength of an adhesive bonded to different tooth surfaces (human premolar, bovine incisor and rebonded human premolar). Methods: Two groups of thirty premolar teeth and one group of bovine incisors had brackets attached in a standardized manner using Transbond XT (3M Unitek). The adhesive was cured using conventional halogen light and a specially designed tool to standardize the distance between the light curing tip and the adhesive. The debonding force was measured using Instron universal testing machine. ANOVA and Post Hoc Dunnett C test were performed to determine any significant difference among groups (p
    Matched MeSH terms: Resin Cements
  16. Faisal Ismail Bahnasi, Nagham Mohammed Abdullah, Mohamed Ibrahim Abu-Hassan
    Compendium of Oral Science, 2014;1(1):24-29.
    Objectives: To evaluate the effect of light-cure devices and curing times on the shear bond strength (SBS) of orthodontic brackets.

    Material and Methods: 60-extracted human premolars were divided into 6-groups of 10-teeth each and bonded with stainless-steel brackets by using 3M Unitek Transbond XT composite. Specimens were cured with halogen, LED and plasma arc lights with two different times for each. The specimens were subjected to shear force till debond with a crosshead speed of 1mm/min and tested after 5min. The stress was calculated and data were subjected to statistical analysis.

    Results: one-way ANOVA and Dunnett T3 post hoc comparison test were used. There were no significant differences between the 6 groups (p < 0.05).

    Conclusions: all curing light methods with loading force after 5 min achieved SBS more than the normal range; therefore, arch wire can be inserted at the same visit using any of tested curing light device or curing time.
    Matched MeSH terms: Resin Cements
  17. Al-Makramani BMA, Razak AAA, Abu-Hassan MI, Al-Sanabani FA, Albakri FM
    Open Access Maced J Med Sci, 2018 Mar 15;6(3):548-553.
    PMID: 29610618 DOI: 10.3889/oamjms.2018.111
    BACKGROUND: The selection of the appropriate luting cement is a key factor for achieving a strong bond between prepared teeth and dental restorations.

    AIM: To evaluate the shear bond strength of Zinc phosphate cement Elite, glass ionomer cement Fuji I, resin-modified glass ionomer cement Fuji Plus and resin luting cement Panavia-F to Turkom-Cera all-ceramic material.

    MATERIALS AND METHODS: Turkom-Cera was used to form discs 10mm in diameter and 3 mm in thickness (n = 40). The ceramic discs were wet ground, air - particle abraded with 50 - μm aluminium oxide particles and randomly divided into four groups (n = 10). The luting cement was bonded to Turkom-Cera discs as per manufacturer instructions. The shear bond strengths were determined using the universal testing machine at a crosshead speed of 0.5 mm/min. The data were analysed using the tests One Way ANOVA, the nonparametric Kruskal - Wallis test and Mann - Whitney Post hoc test.

    RESULTS: The shear bond strength of the Elite, Fuji I, Fuji Plus and Panavia F groups were: 0.92 ± 0.42, 2.04 ± 0.78, 4.37 ± 1.18, and 16.42 ± 3.38 MPa, respectively. There was the statistically significant difference between the four luting cement tested (p < 0.05).

    CONCLUSION: the phosphate-containing resin cement Panavia-F exhibited shear bond strength value significantly higher than all materials tested.

    Matched MeSH terms: Resin Cements
  18. Chauhan NS, Saraswat N, Parashar A, Sandu KS, Jhajharia K, Rabadiya N
    J Int Soc Prev Community Dent, 2019 04 12;9(2):144-151.
    PMID: 31058064 DOI: 10.4103/jispcd.JISPCD_334_18
    Aims and Objectives: To compare the effect for fracture resistance of different coronally extended post length with two different post materials.

    Materials and Methods: One hundred and sixty endodontically treated maxillary central incisors embedded in acrylic resin with decoronated root portion were taken for the study. The postspaces were prepared according to standard protocol. The samples were divided into two groups according to the post material: glass-fiber post and Quartz fiber post. These groups were further subdivided on the basis of coronal extension of 4 and 6 mm for glass fiber and Quartz fiber posts, respectively. The posts were then luted with dual-polymerizing resin cement followed by core buildup. Samples were subjected to increasing compressive oblique load until fracture occurred in a universal testing machine. Data were analyzed with one-way ANOVA and independent Student's t-test. Analysis was done using SPSS version 15 (SPSS Inc., Chicago, IL, USA) Windows software program.

    Results: Glass fiber post with coronal extension of 4 mm (182.8 N) showed better results than with 6-mm length (124.1 N). Similarly, in quartz fiber posts group, 4-mm postlength (314 N) was better when compared with 6 mm (160 N). The 4-mm coronal extension of quartz fiber post displayed superior fracture resistance.

    Conclusions: Glass fiber posts showed better fracture resistance than Quartz fiber posts. 4-mm coronal length showed more fracture resistance than 6 mm.

    Matched MeSH terms: Resin Cements
  19. Al-Khadim Aws H., Abdullah H., Al-Ani Sarah T.
    Introduction: The purpose of this in vitro study was to evaluate the effect of thermocycling on the compressive strength of selected luting cements. Material and methods: 5 types of luting cements were tested. A total of thirty cylindrical specimens measuring 6mm in height and 4mm in diameter were prepared for each type of cement which were then divided into two groups ie Group 1: Exposure, and Group 2: Control. Both groups were stored in distilled water at 37°C for 24 hours. Group 1 was subjected to 500 cycles in a thermocycling baths of 5ºC and 55ºC with 20 seconds in each bath. Group 2 was not exposed to thermocycling procedure. The compressive strength for each cement type was determined by using a universal testing machine. Results: Resin adhesive cement had the highest compressive strength; followed by conventional glass ionomer cement (GIC) whilst resin modified GIC was the least. Thermocycling had no significant effect on the compressive strength of RelyXTM ARC and Fuji I (p>0.05), but a significant effect on Fuji I CAPSULE, Fuji CEM, Fuji Plus CAPSLUE (p
    Matched MeSH terms: Resin Cements
  20. Zalina Laili, Muhamad Samudi Yasir, Mohd Abdul Wahab Yusof
    Sains Malaysiana, 2017;46:1617-1623.
    The influence of water-to-cement ratio (w/c) on the compressive strength of cement-biochar-spent resins matrix was
    investigated. Spent resins waste from nuclear reactor operation was solidified using cement with w/c ranging from 0.35
    to 0.90 by weight. In this study, biochar was used as a cement admixture. Some properties of spent resins and biochar
    were determined prior to the formulation study. Compressive strength of harden cement-biochar-spent resins matrix
    was determined at 28 days. The compressive strength of cement-biochar-spent resins matrix was found to depend on the
    w/c and the amount of spent resins added to the formulation. The immersion test of cement-biochar-spent resins matrix
    showed no significant effects of cracking and swelling. The compressive strength of the cement-biochar-spent resins
    matrix increased after two weeks in water immersion test.
    Matched MeSH terms: Resin Cements
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