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This is a discontinued item
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Tube and Screw is used for dentist removable fixed prosthesis, implant
suprastructures, and telescopic prosthesis.
Used in a
vertical application, the bonding technique is recommended as it is
easier and more accurate.
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Advantages
Easy to use.
Prethreaded tubes for casting to or bonding cast primary units.
Versatile.
Multiple sizes of 1.20mm and 1.40mm diameter. Short and long
available in each diameter.
Accurate. End
cutting bur provides for accurate sizing and finishing of cast collar.
Component Listing
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Tube
& Screw
The Tube and Screw is used for dentist
removable fixed prosthesis, implant suprastructures, and Telescopic
prosthesis.
Prethreaded
tubes for casting to or bonding cast primary units
Available in 1.20mm and 1.40mm short and long sizes. |
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Tube
& Screw Fixation Screw
Thread the fixation screw into the tube prior to
investing and casting. Remove the screw after devesting.
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Tube
& Screw Mounting Screw
Position the plastic collar or disc with the
proper size wax mounting screw. Modify the wax mounting screw if
necessary. Wax the secondary crown.
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Tube
& Screw End Cutting Bur
Used to make
adjustments to the tube.
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Tube
& Screw Thread Cutter
If the screw channel is
tight, or has bubbles, use the proper size end cutting bur to calibrate, or
refine, the screw rest. Use the socket key.
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Tube
& Screw Screwdriver
Used to thread in the
original screw and complete any necessary adjustments.
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Tube
& Screw Socket
Used to hold the thread
cutter during adjustments.
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Laboratory Procedures
Casting to the Tube
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1 |
2 |
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1. Select the proper length and diameter
of tube and screw. Wax the primary crown/coping or bar. Position the
Cerunor alloy tube into the wax pattern of the primary crown/coping/bar in a
vertical position (FIG 1).
2. Remove any wax around the opening of
the tube (FIG 2). |
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3 |
4 |
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3. Select the proper size investment
fixation screw. Coat the threaded portion and part way up the shank
with Preat Liquid Colloidal Graphite. Thread the investment fixation screw
into the tube (FIG 3).
4. Invest and burnout. For precious
metal castings, be sure to burn out at a minimum of 1300º F, and for
porcelain fused to metal alloys at a minimum of 1500º F. Do NOT use
non-precious alloys. Complete the casting (FIG 4). |
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5 |
6 |
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5. Devest the casting. Unthread the
investment fixation screw. If the investment fixation screw is frozen
in the casting, warm sulfuric acid will leach, or dissolve, the investment
fixation screw (FIG 5).
6. Position the plastic collar or disc
with the proper size wax mounting screw. Modify the wax mounting screw
if necessary. Wax the secondary crown(s) (FIG 6). |
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7 |
8 |
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7. Remove the wax mounting screw.
Remove the secondary crown and invest, burnout, and cast (FIG 7).
8. Finish and seat
secondary casting on the primary casting. If the screw channel is
tight, or has bubbles, use the proper size end cutting bur to calibrate, or
refine, the screw rest. Be sure to maintain the full thickness of the
plastic collar for adequate strength (FIG 8).
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9 |
9.
Thread in the original screw and complete any necessary adjustments (FIG 9). |
Bonding of the Tube to the Casting
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10 |
11 |
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1. Allow a minimum of 0.3mm space for wax
(metal) between the die and the waxing spacer. Select the proper
diameter and length waxing spacer and tube and screw (FIG 10).
2. Lubricate the
waxing spacer with either die lube or silicone. Wax the primary unit
around the waxing spacer (FIG 11). |
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12 |
13 |
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3. Carefully remove the waxing spacer.
Make a hole to allow investment to fill the space and pass through (FIG 12).
Invest, cast, and devest.
4. Thread the fixation screw into the
tube to act as a handle or retainer. Clean the outside of the tube of
any body oils. Sandblast the outside of the tube and the space in the
casting with clean, small size, aluminum oxide (FIG 13). Clean the
outside of the tube and the inside of the space in the casting. |
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14 |
5. Put
some wax on the fixation screw to keep it free from the composite bonding
material. Mix equal parts of Ceka Site anaerobic bonding composite
resin. Place in the space in the casting and on the outside of the
tube. Position the tube in the casting. Allow to set for 5
minutes. Remove any excess composite and remove the fixation screw
(FIG 14).
Please make sure to make a
fresh mix of Ceka Site for each tube. Do not use the
excess Ceka Site on the mixing pad, as its working time has expired. |
Complete
steps 6-9 from the "Casting to Tube" technique.
Removal of Screw Retained Prosthesis
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15 |
Loosen and
remove the screw by turning it in a counterclockwise direction with the Tube
and Screw screwdriver (FIG 15). |
Technical Tips
The Cerunor Alloy may be cast
to with precious or semi-precious alloys. The Cerunor tube may be bonded
to precious, semi-precious, and non-precious alloys.
The Tube and Screw are a
holding device to maintain separate castings in a locked or fixed position.
The Tube and Screw are not designed to correct movement or deficiency between
two cast units.
Do NOT use the Tube and Screw
when the deviation from the path of insertion exceeds 30º.
Always keep the screw head
out of occlusal contact.
T0021.REV.00
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