WorksheetsAmalgam Restorations and patient/operator positioning
Total questions: 35
Worksheet time: 18mins
Name
Class
Date
1.
Which of the following is an aim of proper patient and operator positioning?
a)
It should support back of patient
b)
Control switches should be far away
c)
Headrest should be in a position to reduce strain on patient’s chin muscles
d)
Working area should be kept hidden from patient’s view
2.
Which of the following positions is suitable for working on labial surface of mandibular anterior teeth?
a)
7 o’ clock
b)
9 o’ clock
c)
11 o’ clock
d)
12 o’ clock
3.
Which of the following positions is suitable for working on occlusal surfaces of mandibular right posterior teeth?
a)
Right front position
b)
Right position
c)
Right rear position
d)
Direct rear position
4.
Which of the following positions is referred to as universal operating system?
a)
Right front position
b)
Right position
c)
Right rear position
d)
Direct rear position
5.
What is 11 o’clock position also known as?
a)
Right front position
b)
Right position
c)
Right rear position
d)
Direct rear position
6.
Which of the following positions is most convenient for working on palatal surface of maxillary anterior teeth?
a)
Right front position
b)
Right position
c)
Right rear position
d)
Direct rear position
7.
Which of the following positions is only suitable for working on lingual surfaces of mandibular anterior teeth?
a)
Right front position
b)
Right position
c)
Right rear position
d)
Direct rear position
8.
Which of the following patient position is mostly used in operative dentistry?
a)
Upright
b)
Reclined 45 degrees
c)
Almost supine
d)
Supine
9.
What should be the level of the operator’s elbow with respect to the level of the teeth being treated?
a)
At the same level
b)
Hands should be above level of teeth
c)
Hands should be below level of teeth
d)
Hands should be angled 45 degrees downward towards the teeth
10.
Which of the following positions is used to operate on facial surfaces of right maxillary posterior teeth?
a)
Right front position
b)
Right position
c)
Right rear position
d)
Direct rear position
11.
Which of the following operator position is used to operate maxillary left molar teeth?
a)
Right front position
b)
Right position
c)
Right rear position
d)
Direct rear position
12.
While working on the maxillary arch, what should be the position of occlusal surface relative to the floor?
a)
Parallel to the floor
b)
Angled at 45 degrees
c)
Angled at 60 degrees
d)
Perpendicular to the floor
13.
While working on the mandibular arch, what should be the position of occlusal surface relative to the floor?
a)
Parallel to the floor
b)
Angled at 45 degrees
c)
Angled at 60 degrees
d)
Perpendicular to the floor
14.
Which of the following is not considered a good behavior on the dentist’s side?
a)
Maintaining working distance from the patient
b)
Resting forearms on the patient’s shoulder
c)
Rotating the patient’s head backward or forward
d)
Operator changing his position during procedure
15.
Which of the following is correct with regard to use of operating stool?
a)
he stool should be immovable to prevent shifts in position
b)
Operator can balance himself on feet of stool
c)
Legs of operator can be tilted with respect to the ground
d)
Operator should sit back using the entire seat not just the front.
16.
For maxillary anterior teeth, the chair height should be below the shoulder level of operator at about:
a)
a) 4cm
b)
b) 6 cm
c)
c) 8 cm
d)
d) 10 cm
17.
In universal seated positioned a head tilt of following is appropriate for the operator:
a)
a) 0-10
b)
b) 0-15
c)
c) 0-20
d)
d) 0-25
18.
For left-handed operator, the left front position is:
a)
a) 1- O’clock
b)
b) 3- O’clock
c)
c) 5- O’ clock
d)
d) 7- O’ clock
19.
The forearm of the dentist should be:
a)
Parallel to the floor
b)
90 degrees to the floor
c)
75 degree to the floor
d)
45 degrees to the floor
20.
Operators position when working on mandibular right 1st and 2nd molars, based on the dental arches is:
a)
a) Right front of patient
b)
b) Exact right side of patient
c)
c) Just behind the patient on right side
d)
d) Left front of the patient
21.
What is the main advantage of developing high copper amalgam alloy?
a)
Elimination of Gamma 1 phase
b)
Elimination of gamma 2 phase
c)
Increase strength of amalgam
d)
Decrease the flow value of amalgam
22.
Which of the following is true about amalgam restoration?
a)
Aesthetically acceptable restoration
b)
Makes a bond with tooth structure
c)
Difficult to use
d)
Have excellent longevity
23.
Spherical amalgam alloys have
a)
Low mercury alloy ratio
b)
Highly condensable
c)
Longer working time
d)
Adapt adequately with cavity walls
24.
Precarve burnishing should be done at which time?
a)
After the material has been set
b)
Immediately after condensation
c)
Sometime after condensation
d)
After 24 hours
25.
What is the purpose of post carve burnishing?
a)
Maintain the anatomy of restoration
b)
Remove excess of material
c)
Smooth the surface of restoration
d)
Form occlusal contact
26.
What is the optimum depth of self threading pins in amalgum restorations?
a)
0.5
b)
1
c)
2
d)
4
27.
Which of the following amalgam phase has the lowest strength?
a)
Gamma 1 phase
b)
Gamma 2 phase
c)
Gamma 3 phase
d)
Epsilon 1
28.
When the residual mercury is increased in silver amalgam which of the following can occur?
a)
Causes fracture
b)
Cause tarnish and corrosion
c)
Increase in strength
d)
Decrease condensation pressure
29.
What is the puprpose of trituration?
a)
Dissolve the alloy in mercury
b)
Coat the alloy particles in mercury
c)
Remove excess mercury from amalgam
d)
Dissolve Hg in alloy
30.
While preparing class II preparation adequate retention is obtained by which of the following features?
a)
Facial and lingual walls of preparation should be parallel
b)
Facial and lingual walls should be obtuse
c)
Facial and lingual wall of preparation should be parallel or can be slightly obtuse
d)
Facial and lingual walls of preparation should be acute
31.
Which of the following terms describes the principal 'allows the tooth and restorative material to withstand masticatory forces, down the long axis of the tooth'?
a)
Outline form
b)
Resistance form
c)
Retention form
d)
Convenience form
32.
What is the ideal cavosurface angle of amalgam?
a)
40 degree
b)
90 degree
c)
45 degree
d)
70 degree
33.
What is the minimum cavity depth for placement of amalgam?
a)
0.5mm
b)
1mm
c)
1.5mm
d)
2mm
34.
Which of the following describes 'designing the cavity to resist displacement of the restorative material from lifting forces'?
a)
Retention form
b)
Resistance form
c)
Outline form
d)
Convenience form
35.
Which of the following is not a property of amalgam?
a)
Adhesion to tooth
b)
High compressive strength
c)
Good wear resistance
d)
Brittle in thin sections
100 %
