Tube and Screw System

This is a discontinued item

The 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.

 

  

 

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.

 

 

 

 

Tube & Screw Fixation Screw

Thread the fixation screw into the tube prior to investing and casting.  Remove the screw after devesting.

 

 

 

 

 

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.

 

 

 

 

 

Tube & Screw End Cutting Bur

 Used to make adjustments to the tube.

 

 

 
 

 

 

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.

 

 

 

 

 

Tube & Screw Screwdriver

Used to thread in the original screw and complete any necessary adjustments.

 

 

 
 

 

Tube & Screw Socket

Used to hold the thread cutter during adjustments.

 

 

Laboratory Procedures

Casting to the Tube

1

2
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.  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.  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.  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.  Thread in the original screw and complete any necessary adjustments (FIG 9).

Bonding of the Tube to the Casting

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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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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.

 

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

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