WorksheetsORTHO II
Total questions: 20
Worksheet time: 15mins
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
In this study model mention "B"
Posterior sides
Heel sides
Lateral sides
Anterior sides
what is placed on the wire in this diagram "A"
Solder material
Flux
Anti flux
Wax
First step of self-cure acrylization is
Application of cold mold seal
pre treatment of cast
Acrylization
Trimming
The flux used commonly in dentistry is composed of:
Borax glass - Boric acid – Silica
Borax- Fluoride – Silica
Silica- Aluminum- Borax
Borax- Fluoride – tin
______________ are the two basic principles involved in spot welding
Cold and temperature
Pressure only
Pressure and cold
Heat and pressure
Following are the types of orthodontic study models except:
Diagnostic cast
Working cast
Primary cast
Intermediate cast
Orthodontic arch wires should exhibit resistance to tarnish and corrosion and should be non-toxic. This type of property of a wire is called?
Joinability
Formability
Resilience
Biocompatibility & environment stability
Which is not a practical consideration while soldering?
Use the reducing flame of the soldering torch.
Use wet cotton to limit the spread of heat.
The soldered joint should not be polished as it weakens the joint
Use dry cotton to help spread the heat
The base plate used in an orthodontic appliance is fabricated using ______
Methyl methacrylate resin
Ethyl methacrylate resin
Ethyl resin
Methacrylate resin
_________ is used for initial diagnosis and treatment planning.
Working cast
Primary cast
Diagnostic cast
Intermediate cast
