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What is the difference between traditional GV Black preparations and adhesion dentistry? - ✔✔Adhesion dentistry preserves more healthy tooth structure compared to GV Black preparations. What allows for chemical bonds to tooth structure and polymerization of acrylics? - ✔✔The -COOH group in acrylic acid. What is the property of acrylic acid due to the -COOH group? - ✔✔Hydroplasticity. What is the difference between chemical bonding and mechanical bonding? - ✔✔Chemical bonding depends on chemical interaction at the molecular level, while mechanical bonding does not involve primary bonds and requires a smooth surface. Which bond breaks to polymerize PMMA? - ✔✔The C=C bond. What are methacrylates and where are they found? - ✔✔Methacrylates are found in cements and resins, including HEMA and PMMA. What are the different types of cement that can be used to cement a
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What is the difference between traditional GV Black preparations and adhesion dentistry? - ✔✔Adhesion dentistry preserves more healthy tooth structure compared to GV Black preparations. What allows for chemical bonds to tooth structure and polymerization of acrylics? - ✔✔The - COOH group in acrylic acid. What is the property of acrylic acid due to the - COOH group? - ✔✔Hydroplasticity. What is the difference between chemical bonding and mechanical bonding? - ✔✔Chemical bonding depends on chemical interaction at the molecular level, while mechanical bonding does not involve primary bonds and requires a smooth surface. Which bond breaks to polymerize PMMA? - ✔✔The C=C bond. What are methacrylates and where are they found? - ✔✔Methacrylates are found in cements and resins, including HEMA and PMMA. What are the different types of cement that can be used to cement a porcelain jacket crown? - ✔✔Zinc phosphate, polycarboxylate, glass ionomer, or resin cement. What are the primary bonds in zinc phosphate bonds? - ✔✔Friction. What can polycarboxylate cement form chemical bonds with? - ✔✔Collagen, enamel, set polycarboxylate cement, and porcelain. What are some examples of chemical bonds that can form between different dental materials? - ✔✔A chemical bond may form between composite buildup and resin cement, etched dentin and polycarboxylate cement, and glass ionomer cement and enamel.
What are the characteristics and uses of zinc oxide eugenol cements? - ✔✔Zinc oxide eugenol cements do not form chemical bonds with resin cements and should not be used to bond porcelain crowns. What is the purpose of enamel etching? - ✔✔Enamel etching removes the smear layer, prismless enamel, etches the peripheries of the prisms, and roughens the surface. Which type of adhesive resins work better for enamel and dentin? - ✔✔Hydrophobic adhesive resins work equally well for enamel and dentin. Why is bonding to dentin more difficult than bonding to enamel? - ✔✔Bonding to dentin is more difficult due to the complexity of the smear layer, the heterogeneous structure, and the wetness of dentin. What is the purpose of using Dycal (Ca(OH)2) as a base? - ✔✔Dycal is used to neutralize the acidity of zinc phosphate cement. What happens to a Ca(OH2) base under amalgam? - ✔✔It often becomes altered to the consistency of cottage cheese and stimulates secondary dentin formation. Why does ZOE as a base stop sensitivity? - ✔✔ZOE seals the cavity, is bactericidal, and is palliative to the pulp. What materials can promote dentinal bridge formation if a seal is present? - ✔✔Amalgam, calcium hydroxide, and resin can promote dentinal bridge formation if a seal is present. Why is dentin softer near the pulp? - ✔✔Dentin is softer near the pulp because the intertubular dentin is softer, the peritubular dentin is softer, and there are more tubules. What is a glass former? - ✔✔SiO2 is a glass former.
What are the functions of threads on a dental implant? - ✔✔Threads on a dental implant allow for bone ingrowth and mechanical interlock, and the attachment of gingival tissue. What is the advantage of Ti-6%Al-4%V over pure Ti for implants? - ✔✔Ti-6%Al-4%V offers superior osseointegration compared to pure Ti for implants. Which ceramic implant material is most likely to dissolve? - ✔✔A ceramic implant material bonded with pure ionic bonds is most likely to dissolve. What is the first cellular response to an artificial material in the mouth? - ✔✔The first cellular response is inflammatory. What do OSHA regulations cover? - ✔✔OSHA regulations cover physical hazards, chemical hazards, and biological hazards. What is biocompatibility? - ✔✔Biocompatibility is the biological response of the host to a foreign material, indicated by fibrosis and secondary dentin formation. What are the commonly used dental solders? - ✔✔Commonly used dental solders include Au/Cu/Sn/Zn, Ag/Cu/Sn, and Cu/Sn/Zn. What is required for a good solder joint between two castings? - ✔✔A good solder joint requires clean surfaces, the presence of free electrons, and a passive oxide layer. Which metals form an adherent passivating layer? - ✔✔Ti, Ag, and Cr form an adherent passivating layer, but Al does not. What is the relationship between the strength of a soldered joint and its porosity, thickness, and surface area? - ✔✔The strength of a soldered joint is inversely proportional to its porosity and proportional to its thickness and surface area.
What materials can wires showing superelasticity be made from? - ✔✔Wires showing superelasticity can be made from Ni-Ti or Ni-Cr, but not stainless steel or elastomers. What is the major difference between white and clear ceramic brackets? - ✔✔The major difference is in grain size, not the amount of SiO2. What characteristics should orthodontic wires have? - ✔✔Orthodontic wires should have high springback, low stored energy, and high surface friction. Why is hydroxyapatite not used alone for load-bearing implants? - ✔✔Hydroxyapatite is not used alone for load-bearing implants because it tends to fracture and is too unlike bone mineral. What is osseointegration? - ✔✔Osseointegration describes the integration of an implant and bone without fibrous tissue encapsulation. What is the mechanism of corrosion resistance for Co-Cr alloys? - ✔✔The mechanism of corrosion resistance is a passive oxide layer. Which ceramo-metal alloy forms the thickest oxide layer? - ✔✔Ni-Cr forms the thickest oxide layer.