WorksheetsMCQs on Tarnish, Corrosion, and Dental Implants
Total questions: 30
Worksheet time: 15mins
Which of the following best defines tarnish?
Breakdown of material due to moisture
Discoloration due to surface reaction
Loss of mechanical strength
Formation of cavities
Corrosion is a:
Physical process
Electrochemical process
Mechanical process
Thermal process
Which type of corrosion occurs due to two dissimilar metals in contact in saliva?
Stress corrosion
Galvanic corrosion
Pitting corrosion
Uniform corrosion
Saliva acts as a:
Catalyst
Oxidizing agent
Electrolyte
Reducing agent
Which metal is most resistant to corrosion?
Iron
Zinc
Titanium
Copper
Which dental material is most susceptible to tarnish?
Amalgam
Titanium
Composite resin
Porcelain
Passivation in corrosion resistance is:
Reduction of metal ions
Formation of a protective oxide layer
Increase in surface energy
None of the above
Anodic sites in galvanic corrosion:
Gain electrons
Lose electrons
Are not affected
Get coated with gold
Which of the following is a sign of tarnish?
Rust formation
Crack propagation
Color change
Surface pitting
Which environment increases the rate of corrosion in the oral cavity?
Neutral pH
Dry mouth
Acidic pH
Alkaline pH
Crevice corrosion occurs in:
Open surfaces
Highly polished areas
Gaps and confined spaces
Dry areas
Which dental alloy component is added to improve tarnish resistance?
Tin
Zinc
Palladium
Nickel
Which metal ion release causes allergic reactions in patients?
Gold
Chromium
Nickel
Zinc
How does fluoride affect metal corrosion?
Inhibits corrosion
Enhances corrosion
No effect
Improves biocompatibility
Which of the following methods helps prevent corrosion?
Surface polishing
Air drying
Using dissimilar metals
Applying heat
Which of the following is the most commonly used material for dental implants?
Stainless steel
Zirconia
Titanium
Gold
Titanium is preferred in implants because of:
Cost-effectiveness
High density
Corrosion resistance and biocompatibility
Radiopacity
Zirconia implants are primarily used because they are:
Magnetic
Metallic
Aesthetic and metal-free
Cheaper than titanium
The process by which bone integrates with implant surface is called:
Biocompatibility
Fibrous encapsulation
Osteointegration
Fixation
The oxide layer formed on titanium surface is mainly composed of:
Titanium oxide
Titanium nitride
Calcium phosphate
Zirconium oxide
Which grade of titanium is most commonly used for dental implants?
Grade 1
Grade 2
Grade 4
Grade 5
Titanium alloy Ti-6Al-4V contains:
6% Aluminum and 4% Vanadium
6% Vanadium and 4% Aluminum
4% Carbon and 6% Oxygen
10% Nickel and 5% Chromium
Surface modification of implants improves:
Cost
Osseointegration
Weight
Corrosion
Which is NOT a surface treatment for implants?
Sandblasting
Acid etching
Electroplating
Polishing
Which of the following causes implant failure?
Osseointegration
Corrosion
Surface roughness
Titanium oxide layer
Which implant material is best suited for patients with metal allergies?
Stainless steel
Titanium
Zirconia
Cobalt-chromium
Dental implants are placed in the:
Alveolar bone
Enamel
Pulp chamber
Periodontal ligament
Which element improves mechanical strength in titanium alloy implants?
Iron
Vanadium
Nickel
Cobalt
Plasma spraying in implants is used for:
Reducing cost
Surface coating
Removing metal ions
Making implants smooth
Which property is essential for a successful implant material?
High melting point
Biocompatibility
Transparency
Magnetism
