PubMed · 15443589
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H STICH. 1950-07-10. [Silicon].. https://pubmed.ncbi.nlm.nih.gov/15443589/
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OBJECTIVES: The aim of the overview is to critically analyse the contributing factors to the biological wear process and to screen the wear simulators in dentistry for their capacity to mimic the wear conditions. An overview of the types of wear, grouped as biotribocorrosion, combined with a description of the different wear simulating devices will allow us to better understand the multifactorial nature of wear. METHODS: A search on keywords highlights the most common in-vitro wear simulators and their use in the laboratories for various simulation applications. RESULTS: Wear is a complex process that can hardly be simulated while controlling all variables. Especially the extrapolation of the in-vitro wear results to the in-vivo situation is difficult because there is a lot of interplay with biological factors that are difficult to mimic. SIGNIFICANCE: It is not the degree of sophistication, but the right mix of controllable variables that will make a wear simulator predictive.
Contact allergy is not frequently seen in the oral mucosa. Oral lichenoid reactions in conjunction with dental restorations, particularly amalgam fillings, are among the most common affections. Subjective symptoms such as burning mouth syndrome, could have an allergic component, but the etiology is unclear and complex. Food additives and oral hygiene products can cause oral lesions of allergic nature. Patch testing is the routine diagnostic tool used by dermatologists, though the interpretation of the clinical relevance is crucial.
OBJECTIVES: To evaluate the mechanical behavior of resin cements used for luting fiber post. The influence of the curing mode is analysed. METHODS: Nanoindentation techniques have been applied to determine hardness and Young's modulus of disc-shaped specimens of three types of cements: chemical- , photo- and dual-cured, provided by Ivoclar-Vivadent. Results obtained have been compared with measurements performed inside the post-cement-dentin system. Mechanical properties are evaluated together with scanning electron micrographs showing the post-cement and dentin-cement interfaces. RESULTS AND SIGNIFICANCE: Differences have been detected between mechanical measurements performed inside the post-cement-dentin system and those carried out in laboratory disc-shaped specimens. The close presence of post and dentin boundaries has a lot of influence on the cement behavior. The nanoindentation measurements indicate that the photo-cured cement exhibits a high hardness and stiffness, but with a more marked tendency to brittle failure. The chemically cured cement is the material with higher ability to bear deformation without damage, although its hardness and elastic modulus are significantly lower. Dual-cured cements present the best combination of properties.