Manipulation Of Dental Inlay Wax

Question 1

True or false.

The higher flow of softer waxes produces larger cast metal or hot-isostatically pressed hip (HIP) eramic prosthesis than harder waxes because the soft waxes expand more as the investment heats up during setting and they offer less resistance to the expanding investment during setting.

Answer 1

True

Question 2

True or False.

Waxes oxidized on heating and on prolonged heating some waxes evaporate so that the storage container for melted wax will be coated by _____________. Therefore?

Answer 2

• Gummy deposits
• Care should be exercised to use the lowest temperature possible and to clean the wax spot and replace the wax periodically.

Question 3

To manipulate inlay wax….

Answer 3

Dry heat is preferred to the use of a water bath

Question 4

To avoid distortion during removal of the pattern it should be penetrated slightly with an ______________ and carefully remove from the cavity.

Answer 4

Explorer point

Question 5

A pattern can best be removed by inserting a staple like wire within the surface so that each prong is positioned above the proximal wall areas of the pattern. It should be removed with dental floss loop through the staple and withdrawn in a direction parallel to the axial walls and with minimum distortion.

Answer 5

Mesial occlusal-distal (MOD) pattern

Question 6

After removal touching the pattern with the fingers should be avoided as much as possible to prevent any ____________ and ___________.

Answer 6

Temperature changes and distortion

Question 7

To fabricate indirect patterns the dye should be __________ preferably with a lubricant containing a wetting agent. Any access must be avoided because it will prevent intimate adaptation to the die.

Answer 7

Lubricated

Question 8

The melted wax may be added in layers with a ____________ or a waxing instrument.

Answer 8

Spatula

Question 9

True or false.

The prepared cavity should be overfilled and the wax then carved to the proper contour.

Answer 9

True

Question 10

A ________ or other fine cloth may be used for a final polishing of the pattern, rubbing toward the margins.

Answer 10

Silk

Question 11

However some clinicians prefer to apply ________________ as the wax is cooling to help fill the cavity and prevent distortion during cooling the fingers also accelerate the cooling rate.

Answer 11

Finger pressure

Question 12

True or false.

Although temperature changes should be avoided some technicians prefer to repeatedly remilt small areas along the margins and examine them under a low power microscope.

Answer 12

True

Question 13

What is the most practical method for avoiding any possible delayed distortion?

Answer 13

• Invest the pattern immediately after removal from the mouth or die.
• Once the investment hardens or sets no distortion of the pattern will occur.