A U Yap

Summary

Affiliation: National University of Singapore
Country: Singapore

Publications

  1. ncbi request reprint Effect of mouthrinses on microhardness and wear of composite and compomer restoratives
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 28:740-6. 2003
  2. ncbi request reprint Depression and somatization in patients with temporomandibular disorders
    Adrian U J Yap
    Faculty of Dentistry, Department of Restorative Dentistry, National University of Singapore, 5 Lower Kent Ridge Road, Singapore 119074, Republic of Singapore
    J Prosthet Dent 88:479-84. 2002
  3. ncbi request reprint Influence of dietary simulating solvents on the hardness of provisional restorative materials
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, 5 Lower Kent Ridge Road, Singapore, Singapore 119074
    Dent Mater 20:370-6. 2004
  4. ncbi request reprint Marginal gap formation of composites in dentine: effect of water storage
    A U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    J Oral Rehabil 30:236-42. 2003
  5. ncbi request reprint Effects of instrumentation time on microleakage of resin-modified glass ionomer cements
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 28:47-52. 2003
  6. ncbi request reprint Effects of finishing/polishing techniques on microleakage of resin-modified glass ilonomer cement restorations
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 28:36-41. 2003
  7. ncbi request reprint Corrosion behaviour of high copper dental amalgams
    A U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Singapore
    J Oral Rehabil 31:595-9. 2004
  8. ncbi request reprint Comparison of flexural properties of composite restoratives using the ISO and mini-flexural tests
    A U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Singapore
    J Oral Rehabil 30:171-7. 2003
  9. ncbi request reprint Physico-mechanical properties of a fast-set highly viscous GIC restorative
    A U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Singapore
    J Oral Rehabil 30:1-8. 2003
  10. ncbi request reprint Effects of professionally applied topical fluorides on surface hardness of composite-based restoratives
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore
    Oper Dent 27:576-81. 2002

Collaborators

Detail Information

Publications85

  1. ncbi request reprint Effect of mouthrinses on microhardness and wear of composite and compomer restoratives
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 28:740-6. 2003
    ..The wear resistance of Dyract was significantly reduced after exposure to PF, while the wear resistance of Esthet-X was significantly reduced by AC. The effect of mouthrinses on hardness and wear was material dependent...
  2. ncbi request reprint Depression and somatization in patients with temporomandibular disorders
    Adrian U J Yap
    Faculty of Dentistry, Department of Restorative Dentistry, National University of Singapore, 5 Lower Kent Ridge Road, Singapore 119074, Republic of Singapore
    J Prosthet Dent 88:479-84. 2002
    ..Psychological and behavioral traits may be important for the diagnosis and management of orofacial pain...
  3. ncbi request reprint Influence of dietary simulating solvents on the hardness of provisional restorative materials
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, 5 Lower Kent Ridge Road, Singapore, Singapore 119074
    Dent Mater 20:370-6. 2004
    ..To evaluate the influence of dietary simulating solvents on surface hardness of chemical, light and dual-cure provisional restorative materials...
  4. ncbi request reprint Marginal gap formation of composites in dentine: effect of water storage
    A U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    J Oral Rehabil 30:236-42. 2003
    ..Clinical relevance Bonding systems are mandatory for all composites when bonding to dentin. In the event of a bond failure at placement, hygroscopic expansion of composites can reduce marginal gaps but not completely...
  5. ncbi request reprint Effects of instrumentation time on microleakage of resin-modified glass ionomer cements
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 28:47-52. 2003
    ..Where significant differences in dye penetration scores existed, delayed finishing/polishing resulted in less microleakage...
  6. ncbi request reprint Effects of finishing/polishing techniques on microleakage of resin-modified glass ilonomer cement restorations
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 28:36-41. 2003
    ..FT restorations had significantly less enamel and dentin leakage than PF restorations when treated with OG. The effect of finishing/polishing techniques on microleakage was both tissue and material dependent...
  7. ncbi request reprint Corrosion behaviour of high copper dental amalgams
    A U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Singapore
    J Oral Rehabil 31:595-9. 2004
    ..The corrosion behaviour of high copper amalgam alloys are both material and environment dependent. Certain food substances may increase the corrosion of high copper amalgams...
  8. ncbi request reprint Comparison of flexural properties of composite restoratives using the ISO and mini-flexural tests
    A U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Singapore
    J Oral Rehabil 30:171-7. 2003
    ..53). As MFT has the advantage of ease of specimen fabrication and is more clinically realistic, it is suggested for the testing of composite restoratives...
  9. ncbi request reprint Physico-mechanical properties of a fast-set highly viscous GIC restorative
    A U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Singapore
    J Oral Rehabil 30:1-8. 2003
    ..The mean particle sizes were, however, different and were 13.43 and 7.13 microm for Fuji IX GP and Fuji IX GP Fast, respectively. Fuji IX GP Fast offers no other advantage over Fuji IX GP with the exception of improved hardness...
  10. ncbi request reprint Effects of professionally applied topical fluorides on surface hardness of composite-based restoratives
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore
    Oper Dent 27:576-81. 2002
    ..Therefore, the use of professionally applied topical fluorides, especially APF gel and foam, may be detrimental to the long-term durability of composite-based restoratives...
  11. ncbi request reprint Multiple pains and psychosocial functioning/psychologic distress in TMD patients
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, 5 Lower Kent Ridge Road, Singapore 119074, Republic of Singapore
    Int J Prosthodont 15:461-6. 2002
    ..Nonspecific pain items examined included headaches, heart/chest pain, lower back pain, nausea/abdominal pain, and muscle pain...
  12. ncbi request reprint Changes in flexural properties of composite restoratives after aging in water
    A U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 27:468-74. 2002
    ..Although flexural strength of FT and FF was significantly increased with aging in water, the flexural strength of ZT was significantly decreased...
  13. ncbi request reprint Surface texture of resin-modified glass ionomer cements: effects of finishing/polishing time
    A U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 27:462-7. 2002
    ..Although significant differences in RaV and RaH values were observed among several systems with immediate finishing/polishing, only one (Fuji II LC: RaH - Super-Snap < Robot Carbides) was observed with delayed finishing...
  14. ncbi request reprint Microwave drying of high strength dental stone: effects on dimensional accuracy
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Singapore
    Oper Dent 28:193-9. 2003
    ..Further investigations are required to determine changes in physical properties associated with the aforementioned microwave power density...
  15. ncbi request reprint Prevalence of temporomandibular disorder subtypes, psychologic distress, and psychosocial dysfunction in Asian patients
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, 5 Lower Kent Ridge Road, Singapore 119074, Republic of Singapore
    J Orofac Pain 17:21-8. 2003
    ..The RDC/TMD Axis I and II findings were compared to those of Swedish and American TMD patients...
  16. ncbi request reprint Post-gel polymerization contraction of "low shrinkage" composite restoratives
    A U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 29:182-7. 2004
    ..The post-gel polymerization shrinkage of IS, AL and AM was significantly lower than conventional mini-filled composites...
  17. ncbi request reprint Comparison of surface finish of new aesthetic restorative materials
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 29:100-4. 2004
    ..The surface finish of glass ionomers and compomer was significantly poorer than composites. Composite materials based on ormocer and nanomer technology were significantly smoother than those based on microfillers and nanoclusters...
  18. ncbi request reprint Composite cure and pulp-cell cytotoxicity associated with LED curing lights
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 29:92-9. 2004
    ..Composite cure was not correlated to pulp-cell cytotoxicity. The response of pulpal fibroblasts to unreacted/leached components of composites differs somewhat from odontoblasts...
  19. ncbi request reprint Surface finish of resin-modified and highly viscous glass ionomer cements produced by new one-step systems
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 29:87-91. 2004
    ..The effectiveness of one-step systems, when used to finish/polish resin-modified and highly viscous glass ionomer cements, is product dependent...
  20. ncbi request reprint Fracture resistance of compomer and composite restoratives
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 29:29-34. 2004
    ..When the compomers were compared, FT had significantly higher fracture toughness than DP and CG. In view of their poorer resistance to crack propagation, compomers are not recommended for use in stress-bearing areas...
  21. ncbi request reprint Non-destructive characterization of resin-based filling materials using Electronic Speckle Pattern Interferometry
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, 5 Lower Kent Ridge Road, Singapore, Singapore 119074
    Dent Mater 20:377-82. 2004
    ..The aim of this study was to develop a non-destructive test for characterizing the modulus of resin-based filling materials...
  22. ncbi request reprint Effect of surface treatment and cement maturation on the bond strength of resin-modified glass ionomers to dentin
    Adrian U J Yap
    Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 28:728-33. 2003
    ..At one month, conditioned and untreated specimens exhibited significantly less adhesive failure than etched specimens...
  23. ncbi request reprint Influence of the polymerization process on composite resistance to chemical degradation by food-simulating liquids
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 28:723-7. 2003
    ..After conditioning in water and citric acid, specimens polymerized with HE underwent significantly more softening compared to specimens polymerized with HS, LS and LE...
  24. ncbi request reprint Effect of food-simulating liquids on the shear punch strength of composite and polyacid-modified composite restoratives
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 28:529-34. 2003
    ..EX was significantly stronger than TC and DY after conditioning in air, water and ethanol solution. The shear punch strength of EX and CG was significantly higher than DY after conditioning in heptane...
  25. ncbi request reprint Depressive symptoms in Asian TMD patients and their association with non-specific physical symptoms reporting
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, 5 Lower Kent Ridge Road, Singapore 119074
    J Oral Pathol Med 33:305-10. 2004
    ..This study examined the prevalence of depressive symptoms and their association with non-specific physical symptoms (NPSs) reporting in Asian patients...
  26. ncbi request reprint Composite cure and shrinkage associated with high intensity curing light
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 28:357-64. 2003
    ..In view of the substantial time saving, using high intensity lights may be a viable method to polymerize composites...
  27. ncbi request reprint Surface texture of resin-modified glass ionomer cements: effects of finishing/polishing systems
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 27:381-6. 2002
    ..The use of carbides (RC) and one-step rubber abrasive system (OG) for finishing/polishing of RMGICs is not recommended. Graded abrasive disk (SS) or two-step rubber abrasive (CS) systems should be used instead...
  28. ncbi request reprint Short-term fluoride release from various aesthetic restorative materials
    Adrian U J Yap
    Department of Restorative Dentistry, National University of Singapore
    Oper Dent 27:259-65. 2002
    ..Although fluoride release of the giomer was significantly greater than the other materials at day seven, it became significantly lower at day 28...
  29. ncbi request reprint Clinical TMD, pain-related disability and psychological status of TMD patients
    A U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Singapore
    J Oral Rehabil 29:374-80. 2002
    ..The three most frequent jaw disabilities were: eating hard foods (77.6%), yawning (75.7%) and chewing (64.5%). NUS TMD v1.1 is an extremely useful tool in the diagnosis/research of clinical TMD...
  30. ncbi request reprint On-line computerized diagnosis of pain-related disability and psychological status of TMD patients: a pilot study
    A U Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    J Oral Rehabil 28:78-87. 2001
    ..The three most frequent jaw disabilities were: eating hard foods (84%), yawning (78%) and chewing (65%)...
  31. ncbi request reprint Influence of water exposure on three-body wear of composite restoratives
    A U Yap
    Department of Restorative Dentistry, National University of Singapore, Republic of Singapore
    J Biomed Mater Res 53:547-53. 2000
    ..The effects of water exposure must be considered for the evaluation of wear in all polymeric composite restoratives...
  32. ncbi request reprint Thermal emission by different light-curing units
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 28:260-6. 2003
    ..Thermal emission of LED lights was significantly lower than halogen lights. Significant differences in temperature rise were observed between different curing modes for the same light and between different LED/halogen lights...
  33. ncbi request reprint The effect of polishing systems on microleakage of tooth-coloured restoratives. Part 2: composite and polyacid-modified composite resins
    A U Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore
    J Oral Rehabil 27:205-10. 2000
    ..Results showed that the microleakage resistance at both enamel and dentin margins of composite and polyacid-modified composite resins are not significantly affected by the different polishing systems...
  34. ncbi request reprint Release of methacrylic acid from dental composites
    A U Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, 5 Lower Kent Ridge Road, 119074 Singapore, Singapore
    Dent Mater 16:172-9. 2000
    ..The aim of this study was to investigate the release of methacrylic acid from four commercial dental composite restoratives (Silux Plus (3M), Z100 (3M), Ariston pHc (Vivadent) and Surefil (Dentsply))...
  35. ncbi request reprint The effect of polishing systems on microleakage of tooth coloured restoratives: Part 1. Conventional and resin-modified glass-ionomer cements
    A U Yap
    Faculty of Dentistry, National University of Singapore, Singapore
    J Oral Rehabil 27:117-23. 2000
    ..Results showed that the microleakage at dentin margins of conventional glass-ionomer cements and enamel margins of resin-modified glass-ionomer cements are significantly affected by the different polishing systems...
  36. ncbi request reprint Comparative wear ranking of dental restoratives with the BIOMAT wear simulator. Part II. An SEM evaluation
    A U Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    J Oral Rehabil 27:52-9. 2000
    ..Composite selection for teeth opposing cast chrome prostheses should be done with caution and knowledge of the composition of the material as three-body wear may occur...
  37. ncbi request reprint Relationships between depression/somatization and self-reports of pain and disability
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Singapore
    J Orofac Pain 18:220-5. 2004
    ..To examine the relationship between depression and somatization and pain during muscle and joint palpation as well as limitations related to mandibular functioning (LRMF) in patients with temporomandibular disorders...
  38. ncbi request reprint Effect of hygiene maintenance procedures on surface roughness of composite restoratives
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 30:99-104. 2005
    ..Composite restorations may require re-polishing after exposure to some hygiene maintenance procedures, as Ra values exceeded the critical threshold surface roughness for bacterial adhesion (0.2 microm)...
  39. ncbi request reprint Effects of aging on mechanical properties of composite restoratives: a depth-sensing microindentation approach
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 29:547-53. 2004
    ..No significant difference in hardness and modulus was observed between seven and 30 days for all materials with the exception of CG. For the latter, a significant decrease in mechanical properties was detected over time...
  40. ncbi request reprint Elution of leachable components from composites after LED and halogen light irradiation
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 29:448-53. 2004
    ..The elution of leachable components from composites appears to be curing light specific rather than light source (LED or halogen) and curing mode specific...
  41. ncbi request reprint Influence of curing lights and modes on cross-link density of dental composites
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 29:410-5. 2004
    ..For TL, curing with continuous mode resulted in specimens with significantly higher cross-link density than curing with the soft-start mode...
  42. ncbi request reprint Occlusal contact area (OCA) wear of two new composite restoratives
    A U J Yap
    Department of Restorative Dentistry and Centre for Biomedical Materials Applications and Technology, National University of Singapore, Singapore
    J Oral Rehabil 29:194-200. 2002
    ..The microfilled composite Silux had significantly better OCA wear resistance than the minifilled composites Z100, Z250 and P60...
  43. ncbi request reprint Environmental damage and occlusal contact area wear of composite restoratives
    A U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Singapore
    J Oral Rehabil 29:87-97. 2002
    ..This ranged from 8.9 +/- 2.2 microm for Ariston to 16.5 +/- 5.9 lm for Silux. The effects of the different FSL on OCA wear were material dependent. No correlation was observed between DeltaKHN and wear...
  44. ncbi request reprint Experimental studies on a new bioactive material: HAIonomer cements
    A U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Singapore
    Biomaterials 23:955-62. 2002
    ..Potential uses of this new material include bone cements and performed implants for hard tissue replacement in the field of otological, oral-maxillofacial and orthopedic surgery...
  45. ncbi request reprint Effects of cyclic loading on occlusal contact area wear of composite restoratives
    A U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, 5 Lower Kent Ridge Road, Singapore 119074, Republic of Singapore
    Dent Mater 18:149-58. 2002
    ....
  46. ncbi request reprint Chemical degradation of composite restoratives
    A U Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Singapore
    J Oral Rehabil 28:1015-21. 2001
    ..The effects of chemical media on DH were found to be material dependent. A significant but weak positive correlation (Pearson's correlation [P < 0.05]) exists between change in hardness and thickness of the degradation layer...
  47. ncbi request reprint Effects of aging on repair of resin-modified glass-ionomer cements
    A U Yap
    Faculty of Dentistry, National University of Singapore, Singapore
    J Oral Rehabil 27:422-7. 2000
    ..There appears to be a general decrease in repair bond strengths for all treatment groups after 3 months storage. The clinical repair of resin-modified glass-ionomer cements after this period of time is therefore not recommended...
  48. ncbi request reprint Wear behavior of new composite restoratives
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 29:269-74. 2004
    ..Under the conditions of this in-vitro study, the wear resistance of nanofill and ormocer composites was comparable or superior to polyacid-modified, microfill and minifill composites...
  49. ncbi request reprint Influence of dietary solvents on strength of nanofill and ormocer composites
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 30:129-33. 2005
    ..The strength of the nanofill and ormocer composites was lower than the minifill composite but higher than the compomer and highly viscous glass ionomer cement investigated...
  50. ncbi request reprint Finishing/polishing of composite and compomer restoratives: effectiveness of one-step systems
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 29:275-9. 2004
    ..The effectiveness of the finishing/polishing systems was material dependent. The surface finish produced by PG and SB was superior or comparable to that obtained with CS, SS and OG...
  51. ncbi request reprint Comparative wear ranking of dental restoratives with the BIOMAT wear simulator
    A U Yap
    Department of Restorative Dentistry, Faculty of Engineering, National University of Singapore
    J Oral Rehabil 26:228-35. 1999
    ..The amalgam alloys were significantly harder than the heavily filled and microfilled composite resins. There was no apparent correlation between wear performance and material hardness...
  52. ncbi request reprint Comparison of marginal sealing ability of new generation bonding systems
    A U Yap
    Faculty of Dentistry, National University of Singapore, Singapore
    J Oral Rehabil 25:666-71. 1998
    ..Thermal stresses had some influence on marginal seal but this was both product and tissue specific...
  53. ncbi request reprint Influence of eugenol-containing temporary restorations on bond strength of composite to dentin
    A U Yap
    Department of Restorative Dentistry, Faculty of Dentistry, Centre for Biomedical Materials Applications and Technology, Faculty of Engineering, National University of Singapore, Singapore
    Oper Dent 26:556-61. 2001
    ..Pre-treatment with polycarboxylate cement or IRM mixed at P:L ratio of 10 g: 1 g did not affect shear bond strength of composite to dentin. IRM mixed at a lower P:L ratio of 10 g: 2 g significantly decreased bond strength...
  54. ncbi request reprint Soft-start polymerization: influence on effectiveness of cure and post-gel shrinkage
    A U Yap
    Department of Restorative Dentistry, National University of Singapore, Singapore 119074, Republic of Singapore
    Oper Dent 26:260-6. 2001
    ..Curing with the Spectrum curing light resulted in the lowest polymerization shrinkage...
  55. ncbi request reprint The effectiveness of cure of LED and halogen curing lights at varying cavity depths
    M S Soh
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 28:707-15. 2003
    ..The depth of composite cure with LED LCUs was, therefore, product and mode dependent...
  56. ncbi request reprint Demineralization inhibition of direct tooth-colored restorative materials
    Edelmiro de Hoyos Gonzalez
    Department of Restorative Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 29:578-85. 2004
    ..The demineralization inhibition effect of giomers, conventional and resin-modified glass ionomer cements appear to be more evident at the margins of restorations...
  57. ncbi request reprint Comparative depths of cure among various curing light types and methods
    M S Soh
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 29:9-15. 2004
    ..The depth of composite cure is light unit and exposure mode dependent. Scraping and penetration techniques were found to correlate well but tend to overestimate depth of cure compared to microhardness...
  58. ncbi request reprint Effectiveness of composite cure associated with different curing modes of LED lights
    M S Soh
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 28:371-7. 2003
    ..Hence, the effectiveness of composite cure with LED LCUs is product dependent...
  59. ncbi request reprint The effect of home bleaching agents on the surface roughness of tooth-colored restoratives with time
    Pranee Wattanapayungkul
    Department of Restorative, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 29:398-403. 2004
    ..FO, FF and ZO were not significantly roughened until eight weeks of bleaching. Repolishing or replacement of tooth-colored restorations may be required after bleaching procedures...
  60. ncbi request reprint Influence of thermal cycling on OCA wear of composite restoratives
    A U Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 26:349-56. 2001
    ..Thermal cycling of Ariston at an upper temperature of 60 degrees C significantly decreased wear resistance. Thermal cycling affected only the early wear resistance of Surefil...
  61. ncbi request reprint Influence of light energy density on effectiveness of composite cure
    A U Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 26:460-6. 2001
    ..Effective cure was not achieved with low light intensities (200 to 300 mW/cm2) but could be achieved with high intensities (500 and 600 mW/cm2) after 30 seconds of irradiation...
  62. ncbi request reprint Effect of prophylaxis regimens on surface roughness of glass ionomer cements
    Serene S Wu
    Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 30:180-4. 2005
    ..For FC and FN, a significant increase in roughness was observed after treatment with PB and PP, respectively. Glass ionomer restorations may require re-polishing after exposure to some prophylaxis regimens...
  63. ncbi request reprint Curing efficacy of a new generation high-power LED lamp
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore
    Oper Dent 30:758-63. 2005
    ..The exponential modes of Freelight 2, Freelight and Trilight appear to be more effective than their respective standard modes...
  64. ncbi request reprint Effect of chain modifications on the physicomechanical properties of silsesquioxane-based dental nanocomposites
    Mui Siang Soh
    Faculty of Dentistry, Department of Restorative Dentistry, National University of Singapore, Republic of Singapore
    J Biomed Mater Res B Appl Biomater 85:78-86. 2008
    ..Mechanical properties associated with SSQ compounds were found to be significantly lower than control. However, through chain modifications, mechanical properties of SSQ compounds can be improved by approximately 50%...
  65. ncbi request reprint Effects of storage, thermal and load cycling on a new reinforced glass-ionomer cement
    A U Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore
    J Oral Rehabil 25:40-4. 1998
    ..With the exception of the 1 week storage, uncycled group, the dentine-cement interface had significantly greater leakage than the enamel-cement interface...
  66. ncbi request reprint Mechanical properties of an improved visible light-cured resin-modified glass ionomer cement
    A U Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, 5 Lower Kent Ridge Road, Singapore 119074, Republic of Singapore
    Oper Dent 26:295-301. 2001
    ..A significant very strong and negative correlation was observed between flexural and compressive strengths (r = 0.97)...
  67. ncbi request reprint Comparative wear resistance of reinforced glass ionomer restorative materials
    A U Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 26:343-8. 2001
    ..It may serve as a potential substitute for composites in low-stress situations where fluoride release is desirable and aesthetic requirements are not high...
  68. ncbi request reprint Post-gel polymerization shrinkage associated with different light curing regimens
    C H Chye
    Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 30:474-80. 2005
    ..No significant difference in shrinkage was observed between PC, TC and C at all time intervals. The use of pulse delay and soft-start regimens decreased post-gel polymerization shrinkage...
  69. ncbi request reprint Effectiveness of composite cure associated with different light-curing regimes
    B J Neo
    Faculty of Dentistry, National University of Singapore
    Oper Dent 30:671-5. 2005
    ..Effectiveness of the cure at the bottom surfaces of composites may be increased by soft-start and turbo polymerization regimens...
  70. ncbi request reprint Color stability of a resin-modified glass ionomer cement
    A U Yap
    Department of Restorative Dentistry, Faculty of Dentistry, Centre for Biomedical Materials Application and Technology, National University of Singapore, Institute of Materials Research and Engineering, Singapore
    Oper Dent 26:591-6. 2001
    ..The color stability of the resin-modified glass ionomer investigated was shade dependent. A general decrease in lightness and yellow chroma was observed...
  71. ncbi request reprint Analysis of the degree of conversion of LED and halogen lights using micro-Raman spectroscopy
    M S Soh
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 29:571-7. 2004
    ..No significant difference in degree of conversion was observed for the 10 light curing regimens when compared to MX (control). The curing efficiency of LED lights was comparable to halogen lights regardless of curing modes...
  72. ncbi request reprint Reinforced glass-ionomer cements: the influence of conditioners on marginal leakage
    A U Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Singapore
    J Oral Rehabil 24:477-81. 1997
    ..There was no significant difference in leakage for MM both with and without conditioner. The influence of conditioners on marginal leakage appears to be both product and tissue specific...
  73. ncbi request reprint Physicomechanical evaluation of low-shrinkage dental nanocomposites based on silsesquioxane cores
    Mui S Soh
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Singapore
    Eur J Oral Sci 115:230-8. 2007
    ..Therefore, in the correct formulation, SSQ materials have great potential to be used as low-shrinkage composite restoratives...
  74. ncbi request reprint Controlled light polymerization: does it work?
    Adrian U J Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore
    Pract Proced Aesthet Dent 16:490, 492, 494. 2004
  75. ncbi request reprint Cuspal coverage with resin-bonded metal onlays
    A U Yap
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore
    Dent Update 22:403-6. 1995
    ..One distinct feature of this technique is the minimal tooth preparation required compared with that needed for a conventional crown or onlay. Conservation of the already compromised tooth tissue is thus achieved...
  76. ncbi request reprint Bruxing-type dental wear simulator for ranking of dental restorative materials
    S H Teoh
    Institute of Materials Research and Engineering IMRE, National University of Singapore
    J Biomed Mater Res 43:175-83. 1998
    ..It was concluded that the magnitude of the impact force and the angle of approach during impact with sliding wear are important parameters in the in vitro wear ranking of dental restorative materials...
  77. ncbi request reprint Influence of curing modes on crosslink density in polymer structures
    M S Soh
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, 5 Lower Kent Ridge Road, Singapore, Singapore 119074
    J Dent 32:321-6. 2004
    ..This study investigates the influence of curing modes on the crosslinking density of dental composites...
  78. ncbi request reprint Effects of in-office bleaching products on surface finish of tooth-colored restorations
    Pranee Wattanapayungkul
    Department of Restorative, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 28:15-9. 2003
    ..In-office bleaching products are not detrimental to the surface finish of composites, compomers, giomers and resin-modified glass ionomer cements...
  79. ncbi request reprint Occlusion and periodontal disease--where is the link?
    Jia Hui Fu
    National University of Singapore
    Singapore Dent J 29:22-33. 2007
    ..However, there is a need for more randomized clinical trials to validate this relationship...
  80. ncbi request reprint Post-gel shrinkage with different modes of LED and halogen light curing units
    M S Soh
    Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 29:317-24. 2004
    ..At all time intervals, post-gel shrinkage associated with continuous light curing mode was significantly higher than the soft-start light curing mode for FL and TL...
  81. ncbi request reprint Effects of pH on the microhardness of resin-based restorative materials
    M A Mohamed-Tahir
    Department of Preventive Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore
    Oper Dent 30:661-6. 2005
    ..05. The effects of pH on the microhardness of resin-based restoratives were material dependent. The compomer and giomer materials were more affected by acids of low pH than the composite material that was evaluated...
  82. ncbi request reprint Color perception among different dental personnel
    C P Sim
    Department of Restorative Dentistry, National Dental Center, Singapore, Singapore
    Oper Dent 26:435-9. 2001
    ..A significant difference in deltaL* was observed between dental technicians and prosthodontists for shade C4...
  83. ncbi request reprint Effect of early water exposure on the strength of glass ionomer restoratives
    X Y Wang
    Department of Cariology, Endodontology and Operative Dentistry, Peking University School and Hospital of Somatology, PR China
    Oper Dent 31:584-9. 2006
    ..For both groups, KM and KQ were significantly stronger than FT. Contrary to current teaching, early exposure to water did not weaken glass ionomer restoratives. A marginal increase in strength was actually observed for some materials...
  84. ncbi request reprint Environmental degradation of glass-ionomer cements: a depth-sensing microindentation study
    X Y Wang
    Department of Cariology, Endodontology and Operative Dentistry, Peking University School and Hospital of Stomatology, People s Republic of China
    J Biomed Mater Res B Appl Biomater 82:1-6. 2007
    ..Therefore, the clinical selection of a glass-ionomer material should be based on the oral environment to which it will be subjected...
  85. ncbi request reprint Polish retention of new aesthetic restorative materials over time
    Siang Hui Yap
    SingHealth Polyclinics, Singapore
    Singapore Dent J 26:39-43. 2004
    ..At all time intervals, composite materials based on ormocer and nanomer technology were significantly smoother than all other materials evaluated...