Displaying publications 1 - 20 of 75 in total

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  1. 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
  2. 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*
  3. 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
  4. Fulltext Dental Education Resources On The World
    Khoo, Kong Soo, Ong, Michael Ah Hup
    Ann Dent, 1998;5(1):-.
    MyJurnal
    The existence of numerous World Wide Web (WWW) sites devoted to dental education is proof that dental educators have been utilizing the pedagogical potential of information technology. Despite the availability of an immense quantity of information on the Internet, performing a search is often a complex, uncoordinated and time-consuming procedure, thus the usefulness of a guide on a topic of interest. Forty WWW sites devoted to dental education have been located using search engines. They were evaluated and classified as follows: guides, electronic publications, databases, patient education and undergraduate education; and according to subjects such as oral biology, morphology, histology, microbiology oral pathology, oral and maxillofacial surgery, radiology, periodontology, dental materials, orthodontics and neuroscience. The extensiveness and quality of some of these sites make them useful resources and knowledge banks for the teacher and the student.
    Matched MeSH terms: Dental Materials
  5. A practical three visit complete denture system
    Ling BC
    Ann R Australas Coll Dent Surg, 2000 Oct;15:66-8.
    PMID: 11709981
    Standard prosthodontic procedures require five visits to construct a set of complete maxillary and mandibular dentures. Various attempts have been made to reduce these procedures to four or three appointments. However, most of these techniques require the use of visible light polymerized resin as the final denture base materials. Visible light-cured resin materials have inferior physical properties and biocompatibility problems as compared with heat cured polymethylmethacrylate. This paper describes a system of complete denture construction which requires three clinical appointments instead of the usual five visits. This system is made possible by using the VLC base/tray material as the preliminary impression material as well as the application of a new biometric wax occlusion rim. It retains the use of polymethylmethacrylate as the denture base material. This system also utilizes all the procedures used in the conventional five appointment system of complete denture construction.
    Matched MeSH terms: Dental Materials/chemistry
  6. Some mechanical properties of a highly cross-linked, microwave-polymerized, injection-molded denture base polymer
    Memon MS, Yunus N, Razak AA
    Int J Prosthodont, 2001 May-Jun;14(3):214-8.
    PMID: 11484567
    PURPOSE: The impact strength and the flexural properties of denture base materials are of importance in predicting their clinical performance upon sudden loading. This study compares the impact and transverse strengths and the flexural modulus of three denture base polymers.
    MATERIALS AND METHODS: The investigation included a relatively new microwave-polymerized polyurethane-based denture material processed by an injection-molding technique, a conventional microwave-polymerized denture material, and a heat-polymerized compression-molded poly(methyl methacrylate) (PMMA) denture material. Impact strength was determined using a Charpy-type impact tester. The transverse strength and the flexural modulus were assessed with a three-point bending test. The results were subjected to statistical analysis using a one-way analysis of variance and the Scheffé test for comparison.
    RESULTS: The impact strength of the microwave-polymerized injection-molded polymer was 6.3 kl/m2, while its flexural strength was 66.2 MPa. These values were lower than those shown by the two compression-molded PMMA-based polymers. The differences were statistically significant. The flexural modulus of the new denture material was 2,832 MPa, which was higher than the conventional heat-polymerized polymer but was comparable to the other microwave-polymerized PMMA-based polymer. The difference in the flexural modulus was statistically significant.
    CONCLUSION: In terms of the impact and flexural strengths, the new microwave-polymerized, injection-molded, polyurethane-based polymer offered no advantage over the existing heat- and microwave-polymerized PMMA-based denture base polymers. However, it has a rigidity comparable to that of the microwave-polymerized PMMA polymer.
    Matched MeSH terms: Dental Materials/radiation effects; Dental Materials/chemistry*
  7. Oral lichen planus and lichenoid reactions: etiopathogenesis, diagnosis, management and malignant transformation
    Ismail SB, Kumar SK, Zain RB
    J Oral Sci, 2007 Jun;49(2):89-106.
    PMID: 17634721
    Lichen planus, a chronic autoimmune, mucocutaneous disease affects the oral mucosa (oral lichen planus or OLP) besides the skin, genital mucosa, scalp and nails. An immune mediated pathogenesis is recognized in lichen planus although the exact etiology is unknown. The disease most commonly affects middle-aged females. Oral lichenoid reactions (OLR) which are considered variants of OLP, may be regarded as a disease by itself or as an exacerbation of an existing OLP, by the presence of medication (lichenoid drug reactions) or dental materials (contact hypersensitivity). OLP usually presents as white striations (Wickham's striae), white papules, white plaque, erythema, erosions or blisters. Diagnosis of OLP is established either by clinical examination only or by clinical examination with histopathologic confirmation. Direct immunofluorescence examination is only used as an adjunct to the above method of diagnosis and to rule out specific autoimmune diseases such as pemphigus and pemphigoid. Histopathologic features of OLP and OLR are similar with suggestions of certain discriminatory features by some authors. Topical corticosteroids are the treatment of choice for OLP although several other medications have been studied including retinoids, tacrolimus, cyclosporine and photodynamic therapy. Certain OLP undergo malignant transformation and the exact incidence and mechanisms are still controversial. In this paper, etiopathogenesis, diagnosis, management and malignant transformation of OLP and OLR have been reviewed.
    Matched MeSH terms: Dental Materials/adverse effects
  8. Fulltext The flexural strengths of five commercially available tooth-coloured restorative materials
    Sulaiman, E., Yeo, Y.M., Chong, Y.T.
    Ann Dent, 2007;14(1):39-45.
    MyJurnal
    Purpose of the study: The objective of this study was to investigate the flexural strengths of five commercially available tooth-coloured restorative materials – Alpha-Dent (composite resin, Dental Technologies Inc.), Solare Anterior (composite resin, GC), F2000 (polyacid-modified composite resin, 3M), Beautifil (giomer, Shofu) and Fuji II LC (resin- modified glass ionomer cement, GC] using the ISO 4049 specifications. Materials and Method: Ten specimens of (25±0.2)mm x (2±0.1)mm x (2±0.1)mm from each material were prepared at 22-23ºC using a customized metal mould. After light polymerization, the specimens were stored in distilled water at 37ºC for 24 hours. The specimens were subsequently blotted dry, measured and subjected to flexural testing using an Instron Universal Testing Machine with a crosshead speed of 0.5mm/min. The flexural strengths were calculated from the maximum load exerted on the specimens. Data were analysed using one way ANOVA and scheffe’s post-hoc multiple comparison tests at a significance level of 0.05.Results: The results showed that the mean flexural strengths of Beautifil, Solare Anterior and Alpha-Dent were above 80 MPa and those of F2000 and Fuji II LC were below 80 MPa. The results of one-way ANOVA and Scheffe’s post-host tests demonstrated that Beautifil had significantly higher mean flexural strength compared to Fuji II LC, F2000 and Alpha-Dent (P
    Matched MeSH terms: Dental Materials
  9. Fulltext Current philosophies and practices of general dental practitioners pertaining to direct restorations, bleaching and endodontics
    Lim, T.W., Goh, A.C., Seow, L.L.
    Malaysian Dental Journal, 2007;28(2):122-131.
    MyJurnal
    The aim of the present study was to assess the current approaches and philosophies pertaining to direct restorations, bleaching and root canal treatment amongst general dental practitioners (GDPs) in the Klang Valley, Malaysia. A questionnaire, together with a stamped addressed envelope and an explanatory letter, was sent to 200 GDPs in the Klang Valley in April-July 2005. The GDPs were selected at random. A total of 153 (76.5%) of the GDPs responded to the survey. 46.4% of the respondents stated that the use of amalgam was decreasing whereas 79.7% stated an increase in the use of composite resins. Clinical indication (85.6%) and patients’ demand for aesthetics (73.9%) appeared to be the main factors influencing the choice of restorative materials. Fractured restorations was the main reason for the replacement of amalgam restorations (77.1%) whilst secondary caries was the main reason for the replacement of composite resin restorations (73.9%). Almost two thirds of the GDPs surveyed provided chair side bleaching while 75.8% of the GDPs would supervise home bleaching. Sodium hypochlorite was the most common endodontic irrigant used amongst the GDPs surveyed and cold lateral compaction was the most commonly used obturation technique.
    Matched MeSH terms: Dental Materials
  10. Restorative dental treatment of a canine tooth in a Bornean orang utan
    Purmal K, Nambiar P
    J Vet Dent, 2009;26(1):36-9.
    PMID: 19476086
    Matched MeSH terms: Dental Materials
  11. Edentulous arch treatment with a CAD/CAM screw-retained framework and cemented crowns: a clinical case report
    Baig MR, Rajan G, Rajan M
    J Oral Implantol, 2009;35(6):295-9.
    PMID: 20017646 DOI: 10.1563/AAID-JOI-D-09-00012R1.1
    This article describes the rehabilitation of a completely edentulous patient using a milled titanium implant framework and cemented crowns. This combined approach significantly offsets unsuitable implant position, alignment, or angulation, while ensuring the easy retrievability, repair, and maintenance of the prosthesis. Hence, the dual advantage of cemented-retained crowns reproducing appropriate esthetics and function, irrespective of where the screw access openings are located in the substructure, can be obtained, along with the splinting effect and management of soft and hard tissue deficits achievable with a screw-retained framework.
    Matched MeSH terms: Dental Materials/chemistry
  12. Effect of aging on coronal microleakage in access cavities through metal ceramic crowns restored with resin composites
    Al-Maqtari AA, Lui JL
    J Prosthodont, 2010 Jul;19(5):347-56.
    PMID: 20456026 DOI: 10.1111/j.1532-849X.2010.00593.x
    The purpose of this in vitro study was to determine if packable resin composite with/without flowable resin composite has the ability to prevent coronal leakage in restored endodontic access openings following aging.
    Matched MeSH terms: Dental Materials/chemistry*
  13. Development of a novel model for the investigation of implant-soft tissue interface
    Chai WL, Moharamzadeh K, Brook IM, Emanuelsson L, Palmquist A, van Noort R
    J. Periodontol., 2010 Aug;81(8):1187-95.
    PMID: 20450401 DOI: 10.1902/jop.2010.090648
    In dental implant treatment, the long-term prognosis is dependent on the biologic seal formed by the soft tissue around the implant. The in vitro investigation of the implant-soft tissue interface is usually carried out using a monolayer cell-culture model that lacks a polarized-cell phenotype. This study developed a tissue-engineered three-dimensional oral mucosal model (3D OMM) to investigate the implant-soft tissue interface.
    Matched MeSH terms: Dental Materials
  14. 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*
  15. Full-arch metal-resin cement- and screw-retained provisional restoration for immediately loaded implants
    Baig MR, Rajan G
    J Oral Implantol, 2010;36(3):219-23.
    PMID: 20553176 DOI: 10.1563/AAID-JOI-D-09-00048
    Abstract This article describes the clinical and laboratory procedures involved in the fabrication of laboratory-processed, provisional, screw-retained, implant-supported maxillary and mandibular fixed complete dentures incorporating a cast metal reinforcement for immediate loading of implants. Precise fit is achieved by intraoral luting of the cast frame to milled abutments. Effective splinting of all implants is attained by the metal substructure and retrievability is provided by the screw-retention of the prosthesis.
    Matched MeSH terms: Dental Materials/chemistry
  16. Association of human papillomavirus with denture wearing
    Saini R, Osman NB, Ismail M, Sobri FM, Tang TH, Santhanam J
    J Investig Clin Dent, 2011 Nov;2(4):241-7.
    PMID: 25426895 DOI: 10.1111/j.2041-1626.2011.00068.x
      To determine the prevalence of human papillomavirus in the oral cavity of denture wearers.
    Matched MeSH terms: Dental Materials/chemistry
  17. Surface characterization analysis of failed dental implants using scanning electron microscopy
    Daood U, Bandey N, Qasim SB, Omar H, Khan SA
    Acta Odontol Scand, 2011 Nov;69(6):367-73.
    PMID: 21449690 DOI: 10.3109/00016357.2011.569507
    To investigate the failure of 15 dental implants (Paragon/Zimmer) in relation to their surface quality.
    Matched MeSH terms: Dental Materials/chemistry*
  18. Fulltext The effect of bur preparation on the surface roughness and reline bond strength of urethane dimethacrylate denture base resin
    Baig MR, Ariff FT, Yunus N
    Indian J Dent Res, 2011 Mar-Apr;22(2):210-2.
    PMID: 21891887 DOI: 10.4103/0970-9290.84288
    BACKGROUND: The clinical success of relining depends on the ability of reline resin to bond to denture base. Surface preparations may influence reline bond strength of urethane-based dimethacrylate denture base resin.
    AIM: To investigate the effect of bur preparation on the surface roughness (R a ) of eclipse denture base resin and its shear bond strength (SBS) to an intra-oral self-curing reline material. The mode of reline bonding failure was also examined.
    MATERIALS AND METHODS: Twenty-four cylindrical Eclipse™ specimens were prepared and separated into three groups of eight specimens each. Two groups were subjected to mechanical preparation using standard and fine tungsten carbide (TC) burs and the third group (control) was left unprepared. The R a of all specimens was measured using a contact stylus profilometer. Subsequently, relining was done on the prepared surface and SBS testing was carried out a day later using a universal testing machine.
    RESULTS: One-way ANOVA revealed significant differences (P<0.05) in R a and SBS values for all the groups. Post-hoc Tukey's HSD test showed significant differences (P<0.05) between all the groups in the R a values. For SBS also there were significant differences (P<0.05), except between standard bur and control.
    CONCLUSIONS: 1) There was a statistically significant difference in the R a of Eclipse™ specimens prepared using different carbide burs (P<0.05). 2) There was a statistically significant difference in the relined SBS (P<0.05) when prepared using different burs, but the difference between the standard bur and the control group was not statistically significant.
    Matched MeSH terms: Dental Materials/chemistry*
  19. Fulltext Dental rehabilitation of amelogenesis imperfecta using thermoformed templates
    Sockalingam S
    J Indian Soc Pedod Prev Dent, 2011 Jan-Mar;29(1):53-6.
    PMID: 21521920 DOI: 10.4103/0970-4388.79938
    Amelogenesis imperfecta represents a group of dental developmental conditions that are genomic in origin. Hypoplastic AI, hypomineralised AI or both in combination were the most common types seen clinically. This paper describes oral rehabilitation of a 9-year-old Malay girl with inherited hypoplastic AI using transparent thermoforming templates. The defective surface areas were reconstructed to their original dimensions on stone cast models of the upper and lower arches using composite, and transparent thermoform templates were fabricated on the models. The templates were used as crown formers to reconstruct the defective teeth clinically using esthetically matching composite. The usage of the templates allowed direct light curing of the composite, accurate reproducibility of the anatomic contours of the defective teeth, reduced chair-side time and easy contouring and placement of homogenous thickness of composite in otherwise inaccessible sites of the affected teeth.
    Matched MeSH terms: Dental Materials
  20. Fulltext Fracture resistance tests validation: a survey of literature review
    Ahmad Mahmood, Aws H. Ali Al-Kadhim, Zaripah Wan Bakar, Adam Husein
    Malaysian Dental Journal, 2011;32(1):12-16.
    MyJurnal
    Evaluation of the mechanical behaviour of restoration dental materials is essential to understand their performance under different load conditions and to estimate their durability under clinical oral function. Restorative materials and dental tissues like other materials by having specific mechanical properties, such as static strength (i.e. compressive strength, tensile strength, flexural strength) and dynamic strength (i.e. fatigue strength). The selection of proper mechanical test type depends on the goals that the study claims to define. On such basis, the mechanical test can be chosen correctly. Laboratory studies should be designed as replications of the clinical oral circumstances to measure the mechanical and physical properties of a material and any arbitrary choices in the design of the study may result in large variations of data.
    Matched MeSH terms: Dental Materials
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