Oral health status of Chinese with Down syndrome - a pilot study

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Home Remedies for Dentin Hypersensitivity

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A review of the eruption of primary teeth.

Introduction Eruption of deciduous teeth remains a rather sophisticated process. This paper gives a general overview of the process and explores on its implications. Overview Eruption of deciduous teeth may be divided into pre-eruptive tooth movement, eruptive tooth movement and post-occlusal tooth movement. Emergence of deciduous teeth is usually accompanied by teething symptoms. Mechanisms for eruption are still not entirely apparent. Proposed mechanisms included root elongation, hydrostatic pressure, periodontal ligament traction, bone remodeling and genetic pre-programming / cellular-molecular determinants. Discussion and Conclusion Understanding of the eruption of deciduous teeth made possible age estimation for children, shed light on management of teething issues and likely point towards a treatment philosophy of minimal intervention with definite building blocks of close observation and monitoring.published_or_final_versio

Patients' satisfaction with dental services provided by an university in Hong Kong

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An oral health survey for newly admitted undergraduate students in Hong Kong

This journal suppl. entitled: Special Issue: Abstracts of the 2012 FDI Annual World Dental CongressTheme: Preventive dentistry - Epidemiology (Oral Presentation)AIM: To describe the tooth status, periodontal status, oral health believes of students in a university in Hong Kong. METHOD: This cross-sectional survey recruited a sample of newly admitted students in a Hong Kong university. Tooth and periodontal status was assessed using WHO criteria – DMFT and ...postprin

Heat treatment during setting on properties of resin-based provisional-restorative materials

This journal suppl. entitled: Abstracts of the Academy of Dental Materials Annual Meeting, 8-11 October 2014 - Bologna, ItalyPURPOSE: To study the effect of heat treatment during setting on the physical properties of four resin-based provisional restorative materials. METHODS AND MATERIALS: Four commercial restorative resin materials were employed, namely Duralay (polymethyl methacrylate), Trim II (polyethyl methacrylate), Luxatemp (bis-acrylic composite) and Protemp 4 (bis-acrylic composite). Specimens were prepared at 23 °C, 37 °C or 60 °C in a water bath for evaluation of flexural strength, surface profile, color stability and marginal discrepancy. Flexural strength was determined by 3-point-bending test on each specimen after thermo-cycling (3000 cycles, between 5-55 °C), and its fractured surface was examined under scanning electron microscopy. Surface profile of the specimens was studied using atomic force microscopy. Color stability (ΔE*) was evaluated by comparing the color of the specimens before and after placed in coffee for 14 days. Standardized crowns were prepared for assessment of marginal discrepancy using a travelling microscope. RESULTS: Flexural strength of Trim II and Protemp 4 at 60 °C (Trim II: 51.52 ± 5.59 MPa, Protemp 4: 115.41 ± 12.76 MPa) were higher than those at 37 °C (Trim II: 43.61 ± 6.21 MPa, Protemp 4: 89.38 ± 8.59 MPa) and 23 °C (Trim II: 41.79 ± 5.37 MPa, Protemp 4: 87.50 ± 10.29 MPa) (p 0.05). Slight difference of surface morphology could be seen between different curing temperatures of all types of materials. Luxatemp and Protemp 4 have lower ΔE* compared with other materials, in all the three curing temperatures. Marginal discrepancy of Trim II, Luxatemp and Protemp 4 were higher at 60 °C than those at 23 °C and 37 °C. CONCLUSION: Increase in curing temperature enhances flexural strength of certain resin-based acrylic provisional veneers; however, there is also an increase in the marginal discrepancy. Different curing temperature slightly altered the surface morphology and color stability of material, while different materials have obvious different properties in terms of surface morphology and color stability.published_or_final_versio

Oral health status and behaviours of preschool children in Hong Kong.

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Effectiveness of silver diamine fluoride and sodium fluoride varnish in arresting dentin caries in Chinese pre-school children

Untreated dental caries in Chinese pre-school children is common. This prospective controlled clinical trial investigated the effectiveness of topical fluoride applications in arresting dentin caries. Three hundred seventy-five children, aged 3-5 years, with carious upper anterior teeth were divided into five groups. Children in the first and second groups received annual applications of silver diamine fluoride solution (44,800 ppm F). Sodium fluoride varnish (22,600 ppm F) was applied every three months to the lesions of children in the third and fourth groups. For children in the first and third groups, soft carious tissues were removed prior to fluoride application. The fifth group was the control. Three hundred eight children were followed for 30 months. The respective mean numbers of arrested carious tooth surfaces in the five groups were 2.5, 2.8, 1.5, 1.5, and 1.3 (p < 0.001). Silver diamine fluoride was found to be effective in arresting dentin caries in primary anterior teeth in pre-school children.published_or_final_versio