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Dental waxes
- 7. Based on sources of wax • Natural waxes Mineral Plant Insect Animal • Synthetic waxes Based on application in dentistry • Pattern waxes • Processing waxes • Impression waxes
- 9. Pattern waxes Baseplate wax Inlay wax RPD Casting wax
- 10. Processing waxes Boxing wax Beading wax Utility wax Sticky wax Carding wax Blockout wax White wax
- 11. Impression waxes Occlusal registration wax Functional wax
- 30. Wax grids Wax pattern for premolar,molar clasps
- 31. RPD wax patterns
Editor's Notes
- Onohydric means containing one OH grp
- Organic solvents like xylene ,toluene.
- Shaped , parallel , arbitary
- Melting or liquefaction – when solidto liquid at atmospheric pressure Atmospheric pressure – 101,325 pascals
- Pyrolyzing – being burned out to a point that they melt or decompose into water vapour and co2 leaving no residue.
- Rheology is the study of internal response of the material to the external forces.
- Change in unit length per unit of the original length of a material when a temperature is raised by 1’K. Transition point is the temperature at which coefficient of thermal expansion of a material abruptly increases.At temperature between transition temperature and melting point, waxes exhibits viscoelastic property. Transformation temperature - It is changes in the wax that occur at initial stages of heating, passing from crystalline phase to other molecular phase giving it the natural opacity.
- As wax is heated, a significant expansion occurs but may not be linear with increase in temp.
- At lower temp, linear mol chain of hydrocarbons are entangled , causing wax to behave as a solid. As temp increase, chain becomes mobile rendering it to flow.
- Dip wax , dipping of die in electric wax pot, uniform layer of wax over preparation, careful removal of excessive dip wax
- For building veneers Design patterns to be tried in the mouth in normal climatic conditions Trial fitting in the mouth in tropical climate. Differentiation of one from other type is by the percentage of flow of each type of wax at room temperature, at mouth temperature and at 45.c
- Establish initial arch form,plane of occlsion,vertical dimension,arranging teeth,for try in, bite registration