A novel application of nano eggshell/titanium dioxide composite on occluding dentine tubules: an in vitro study

Abstract To synthesize Nano eggshell-titanium-dioxide (EB@TiO2) biocomposite and to evaluate its effectiveness in occluding opened dentine tubules. EB@TiO2 was synthesized and characterized using X-ray diffraction (XRD), and Transmission Electron Microscope (TEM). Sixteen simulated bovine dentine discs were prepared and randomly assigned into four groups according to the following treatment (n = 4): Group 1: No treatment; Group 2: eggshell powder; Group 3: EB@TiO2; Group 4: Sensodyne. These were then agitated in a solution of 1g powder and 40mL water for 3hours. Thereafter, each dentine discs from the respective groups were post-treated for 5 min with 2wt% citric acid to test their acid resistant characteristics. Scanning Electron Microscope (SEM) was used to observe the effectiveness of occluded dentine pre-and post-treatment. The cytotoxicity of the synthesized EB@TiO2 was tested using NIH 3T3 assay. ANOVA was used to evaluate the mean values of the occluded area ratio and the data of MTS assay. This was followed by a multi-comparison test with Bonferroni correction (α = .05). The XRD confirmed that EB@TiO2 was successfully modified through ball-milling. The TEM revealed the presence of both spherical and irregular particle shape powders. The SEM result showed that EB@TiO2 could effectively occlude open dentine tubules. Equally, the result demonstrated that EB@TiO2 exhibited the highest acid resistant stability post-treatment. NIH 3T3 assay identified that EB@TiO2 had little effect on the NIH 3T3 cell line even at the highest concentration of 100µg/ml. This study suggests that the application of EB@TiO2 effectively occluded dentine tubules and the occlusion showed a high acid resistant stability.

A conceptual framework to guide public oral health planning in Limpopo province

Background: There is limited understanding of the complexities surrounding public oral health service delivery in South Africa and the resulting impact on oral health outcomes. Aim: This study aimed to identify the strengths and challenges in oral health decision-making within the public health sector and to propose a conceptual framework to guide oral health service delivery in the province. Setting: This study was performed in the Limpopo province. Methods: National and provincial health policy documents were reviewed to identify statements on oral health service delivery. A face-to-face, semi-structured interview was conducted with the Limpopo Provincial Manager of Department of Health, Oral Health Services. Data were collected on oral health policies and the organisational structure of public oral health services. A self-administered questionnaire was completed by five district managers of public oral health services to obtain data on the delivery of public oral health services in Limpopo province. Results: The results indicated that oral healthcare was not explicitly mentioned, included or referred to in the examined health policy documents. The interviews indicated that public oral health services do not have a dedicated budget and were not considered a priority. The questionnaire results revealed challenges in infrastructure, human resources and perceived marginalisation from the healthcare services. Participants agreed that there was a need for oral health to be clearly expressed and prioritised in health policy statements. Conclusion: This study proposed a framework that incorporated the identified core components that influenced oral health services provision in Limpopo province