Downloaded 97 times
More Related Content
Similar to Inlay wax | Dentistry
Inlay wax | Dentistry
- 1. INLAY WAX ABHIRAM AB IIIRD YEAR
- 2. CONTENTS • Introduction • Classification •Composition • Types • Manipulation • Reference
- 3. INTRODUCTION • Many proceduresin dentistry require the use of waxes • Waxes are used for some of the highest precision work in Dentistry like patterns for metal castings • There also used for boxing Impressions and blocking Undercuts. • Waxes continue to remain important and irreplaceable material in the dentistry because of its low cost and it’s combination of special properties
- 4. Classification Clinical • Bite registration •Disclosing • Type I inlay wax Laboratory • Baseplate wax • Beading • Boxing • Sticky • Utility Based on their uses
- 5. Classification Pattern wax • Castingwax • Baseplate wax • Inlay wax Impression wax • Corrective wax • Biteplate wax Processing wax • Boxing wax • Beading wax • Sticky wax Based on their application
- 6. • Used toform the curved patterns of the restoration with material such as acrylic, metal, Or ceramic Pattern waxes • Auxiliary dental waxes which aid in constructing the restoration either in the clinic or in laboratory Processing waxes • Primarily used to make impressions of edentulous regions in the mouth Impression waxes
- 7. Composition • The dentalwaxes may be composed of natural waxes and synthetic waxes, gums, fats, fatty acids, oils. • Natural waxes are derived from mineral, vegetable, and animal origins. • Synthetic waxes are chemically synthesized from natural wax molecules and are typically composed of hydrogen, carbon, oxygen, and chlorine. • Coloring agents are added for contrast of wax patterns against tooth, die, and model surfaces. • Some formulations contain a compatible filler to control expansion and shrinkage of the wax product. • Paraffin wax = 40 to 60 % • Gum dammar • Carnauba wax • Colouring agent
- 8. PARAFFIN WAX: • Derivedfrom high boiling fraction of petroleum. • Depending upon Molecular Wt. & Distribution can be obtained in a wide melting or softening range. • Paraffin used for Type I waxes have higher melting point than the Paraffin used for Type II waxes. DISADVANTAGES # Flake when it is trimmed. Does not present Smooth, Glossy surface.
- 9. GUM DAMMAR orDAMMAR RESIN • Natural Resin. • Added to improve the smoothness in moulding. • Resistant to Cracking & Flaking. • Increases the Toughness of the wax. • Enhances the Smoothness of the surface.
- 10. CARNAUBA WAX: • Occursas fine powder. Quite Hard in nature. • High Melting point. Combined with paraffin to Decrease the flow at mouth temperature. • Give more Glossiness to wax surface than dammar resin.
- 11. CANDELILLA WAX • canalso be added to replace the Carnauba wax. • Its Melting point is lower. Not as hard as Carnauba wax. • Modify of wax.
- 12. PROPERTIES OF INLAYWAX • When softened wax should be uniform. • Color should contrast with the die material. • No Flakiness or similar surface roughness when wax is bent & molded after softening. • Should Vaporize completely during burnout (500°c). • Wax should not pull or chip during carving. • Wax pattern should be completely rigid & dimensionally stable. • FLOW • THERMAL PROPERTIES • WAX DISTORTION • MANIPULATION OF INLAY WAX • . OTHER DENTAL WAXES
- 13. FLOW • Requirements accordingto ADA Specification no. 4. • At 45°C – Both Type I & II should have a flow b/w70 to 90%. • At 37°C-Type I should not flow more than 16.
- 14. THERMAL PROPERTIES – THERMALCONDUCTIVITY • Low. • Takes time to heat the wax uniformly. • COEFFICIENT OF THERMAL EXPANSION: High. • Thermal changes are higher than any other materials. • Linear expansion of 0.6 % when heated from 25 to 37°C is permitted for Type I waxes. • This property is more significant in Direct Tech. Other Factors that influence the Coefficient of Thermal Expansion are- • Temperature of the Die. • Method used for applying pressure to the wax.
- 15. WAX DISTORTION • Mostserous problem in Inlay wax. It is due to Release of Stresses in pattern due to.. Contraction on cooling. Occluded gas bubbles. • Change of shape of wax duringmoulding. From Manipulation, Carving, Pooling Removal.
- 16. CAUSES OF DISTORTION: •If wax is not at uniform temp. When inserted in the cavity. • If wax is not help under uniform pressure during cooling. • If wax is added in an area of deficiency.
- 17. TO AVOID DISTORTIONOF WAXES: • Minimal carving & change in temperature. • Minimal Storage of pattern. Use warm instrument for carving. • Store it in a Fridge if necessary.
- 18. MANIPULATION OF INLAYWAX TECHNIQUES – • DIRECT TECHNIQUE INDIRECT TECHNIQUE • DIRECT TECHNIQUE:: • Softened the stick of wax over the flame. Inserted into the cavity & held under finger pressure. • Allow to cool gradually at mouth temperature. • Withdraw the wax pattern carefully. • .INDIRECT TECHNIQUE:: • Pattern is prepared over a lubricated • die. • If molten wax used, very little stresses • occur.
- 19. METHODS OF INDIRECTTECHNIQUE- • Dipping Method - • In full crowns. *Die is dipped in hot liquid wax. • • Softening In Warm recommended. • • Water- Not • • Adding in Layer Using spatula or brush.
- 20. TYPES OF IINLAYWAX • Inlay waxes are used to prepare patterns –Type is a medium wax employed in • direct techniques and type Il is a soft wax • used in the indirect techniques. • Inlay wax must exhibit excellent • adaptability to model or die surfaces, and • it must be free from distortion, flaking, or • chipping during the preparation of patterns. • Inlay waxes may be softened over a flame or in water at 54 °C to 60 °C to enable their flow in the liquid state and their adaptation to the prepared tooth or die. • For direct wax techniques type inlay wax must soften at a temperature that
- 21.