ORTHO II

  Soldering involves the flow of the _____ metal between the metallic parts to be joined.

• Solid filler

• low fusing

• Molten filler

• High fusing

    _________ alloys are also known as eligiloy

• Gold

• Niti

• SS

• Cobalt chromium

The self-cure or cold cure acrylic resins are most frequently used for the fabrication of orthodontic _________

• Base plate

• Retainers

• Bite blocks

• Study models

  Investment soldering is carried out whenever the area of contact between the metallic parts being joined is large and whenever precision is needed in ____ the metals.

• Joining

• Separating

• Wrapping

• Partially joining

_________ must be preserved when trimming the model.

• Anatomic part

• Artistic part

• Dental part

• Soft tissue part

The first 5 steps involved in soldering include all except

• Cleaning the surfaces to be joined.

•     Selecting the right solder and flux.

• Assembling the parts to be joined.

• Quenching

The process involves soldering two metallic parts together after adequate stabilization, without the use of investment, to precisely hold the parts together.

• Investment soldering

• Spot welding

• Free hand soldering

• Investment soldering

  In spot welding, Electric current (A/C) is made to pass through a ______to obtain a low voltage and high amperage current that is conducted through two copper electrodes on either side of the metals being joined.

• Step up transformer

• Step down transformer

• Transistor

• Pair of cells

One if the disadvantages of salt and pepper method is:

•       No difficulty in obtaining a uniform thickness of base plate

• It is not time consuming

• Poses high risk of porosity

• Requires few seconds

      During finishing and polishing the casts are then removed from the solution, allowed to dry and then polished with the help of a lathe buff

• Tooth brush

• Paint brush

• Lathe buff

• Trimmer