Inlay wax | Dentistry

1. INLAY WAX
ABHIRAM A B
IIIRD YEAR

2. CONTENTS
• Introduction
• Classification
• Composition
• Types
• Manipulation
• Reference

3. INTRODUCTION
• Many procedures in 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
• Casting wax
• Baseplate wax
• Inlay wax
Impression wax
• Corrective wax
• Biteplate wax
Processing wax
• Boxing wax
• Beading wax
• Sticky wax
Based on their application

6. • Used to form 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 dental waxes 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:
• Derived from 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 or DAMMAR 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:
• Occurs as 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
• can also be added to replace the Carnauba wax.
• Its Melting point is lower. Not as hard as Carnauba wax.
• Modify of wax.

12. PROPERTIES OF INLAY WAX
• 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 according to 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 –
THERMAL CONDUCTIVITY
• 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
• Most serous 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 DISTORTION OF 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 INLAY WAX
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 INDIRECT TECHNIQUE-
• 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 IINLAY WAX
• 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. Reference