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Worksheets

ORTHO II

Total questions: 20

Worksheet time: 15mins

Name
Class
Date
1.

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

a)

Solid filler

b)

low fusing

c)

Molten filler

d)

High fusing

2.

    _________ alloys are also known as eligiloy

a)

Gold

b)

Niti

c)

SS

d)

Cobalt chromium

3.

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

a)

Base plate

b)

Retainers

c)

Bite blocks

d)

Study models

4.

  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.

a)

Joining

b)

Separating

c)

Wrapping

d)

Partially joining

5.

_________ must be preserved when trimming the model.

a)

Anatomic part

b)

Artistic part

c)

Dental part

d)

Soft tissue part

6.

The first 5 steps involved in soldering include all except

a)

Cleaning the surfaces to be joined.

b)

    Selecting the right solder and flux.

c)

Assembling the parts to be joined.

d)

Quenching

7.

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

a)

Investment soldering

b)

Spot welding

c)

Free hand soldering

d)

Investment soldering

8.

  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.

a)

Step up transformer

b)

Step down transformer

c)

Transistor

d)

Pair of cells

9.

One if the disadvantages of salt and pepper method is:

a)

      No difficulty in obtaining a uniform thickness of base plate

b)

It is not time consuming

c)

Poses high risk of porosity

d)

Requires few seconds

10.

      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

a)

Tooth brush

b)

Paint brush

c)

Lathe buff

d)

Trimmer

11.

In this study model mention "B"

a)

Posterior sides

b)

Heel sides

c)

Lateral sides

d)

Anterior sides

12.

what is placed on the wire in this diagram "A"

a)

Solder material

b)

Flux

c)

Anti flux

d)

Wax

13.

     First step of self-cure acrylization is

a)

Application of cold mold seal

b)

pre treatment of cast

c)

Acrylization

d)

Trimming

14.

      The flux used commonly in dentistry is composed of:

a)

      Borax glass - Boric acid – Silica

b)

     Borax- Fluoride – Silica

c)

      Silica- Aluminum- Borax

d)

      Borax- Fluoride – tin

15.

      ______________ are the two basic principles involved in spot welding

a)

      Cold and temperature

b)

Pressure only

c)

     Pressure and cold

d)

Heat and pressure

16.

     Following are the types of orthodontic study models except:

a)

Diagnostic cast

b)

Working cast

c)

Primary cast

d)

Intermediate cast

17.

      Orthodontic arch wires should exhibit resistance to tarnish and corrosion and should be non-toxic. This type of property of a wire is called?

a)

Joinability

b)

Formability

c)

Resilience

d)

Biocompatibility & environment stability

18.

      Which is not a practical consideration while soldering?

a)

Use the reducing flame of the soldering torch.

b)

      Use wet cotton to limit the spread of heat.

c)

The soldered joint should not be polished as it weakens the joint

d)

     Use dry cotton to help spread the heat

19.

    The base plate used in an orthodontic appliance is fabricated using ______

a)

Methyl methacrylate resin

b)

Ethyl methacrylate resin

c)

Ethyl resin      

d)

Methacrylate resin

20.

     _________ is used for initial diagnosis and treatment planning.

a)

Working cast

b)

Primary cast

c)

Diagnostic cast

d)

Intermediate cast