The most common failure in constructing porcelain to metal is: A. Improper metal framework B. Rapid heating

The most common failure in constructing porcelain to metal is:
A. Improper metal framework
B. Rapid heating
by

1 Answer

Answer :

A. Improper metal framework
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Related questions

When should metallic framework not be contaminated during the fabrication of a porcelain fused to metal crown: A. Between bisque stage and glazing stage B. Between preheat and opaque stages C. Between opaque and bisque stages D. Between one opaque and two opaque stages

Description : When should metallic framework not be contaminated during the fabrication of a porcelain fused to metal crown: A. Between bisque stage and glazing stage B. Between preheat and opaque stages C. Between opaque and bisque stages D. Between one opaque and two opaque stages

Last Answer : B. Between preheat and opaque stages

The most common cause of porosity in porcelain jacket crowns is, A. Moisture contamination B. Excessive firing temperature C. Failure to anneal the platinum matrix D. Excessive condensation of the porcelain E. Inadequate condensation of the porcelain

Description : The most common cause of porosity in porcelain jacket crowns is, A. Moisture contamination B. Excessive firing temperature C. Failure to anneal the platinum matrix D. Excessive condensation of the porcelain E. Inadequate condensation of the porcelain

Last Answer : E. Inadequate condensation of the porcelain

A partial denture that seats on the master cast but fails to seat correctly in the mouth is a result of, A. Contraction of the metal framework during casting B. Insufficient expansion of the investment material C. Distortion of impression D. Failure to block out unwanted undercuts

Description : A partial denture that seats on the master cast but fails to seat correctly in the mouth is a result of, A. Contraction of the metal framework during casting B. Insufficient expansion of the investment material C. Distortion of impression D. Failure to block out unwanted undercuts

Last Answer : C. Distortion of impression

The principle cause of failure of amalgam restoration is: A. Improperly prepared amalgam B. Improper cavity preparation C. Perio involvement D. Particles of amalgam

Description : The principle cause of failure of amalgam restoration is: A. Improperly prepared amalgam B. Improper cavity preparation C. Perio involvement D. Particles of amalgam

Last Answer : B. Improper cavity preparation

“Pop off” of a porcelain veneer from the under the lying gold crown is due to:** A. Too thick application of pure gold surface conditioner B. Contamination at the porcelain metal interface C. Under firing the opaque layer D. All of the above

Description : “Pop off” of a porcelain veneer from the under the lying gold crown is due to:** A. Too thick application of pure gold surface conditioner B. Contamination at the porcelain metal interface C. Under firing the opaque layer D. All of the above

Last Answer : B. Contamination at the porcelain metal interface

What is the minimal labial reduction for porcelain metal crowns: A. 1mm B. 1.5mm C. 0.5mm

Description : What is the minimal labial reduction for porcelain metal crowns: A. 1mm B. 1.5mm C. 0.5mm

Last Answer : B. 1.5mm

The minimal labial tooth reduction for satisfactory aesthetics with porcelain fused to metal crown is, A. 1mm B. The full thickness of enamel C. 1.5 mm D. 2.5mm E. One third of the dentine thickness

Description : The minimal labial tooth reduction for satisfactory aesthetics with porcelain fused to metal crown is, A. 1mm B. The full thickness of enamel C. 1.5 mm D. 2.5mm E. One third of the dentine thickness

Last Answer : C. 1.5 mm

Brick nogging type of partition wall, is constructed by (A) Laying bricks as stretchers in cement mortar (B) Laying bricks as headers in cement mortar (C) Reinforcing brick wall with iron straps (D) Constructing brick work within a wooden framework

Description : Brick nogging type of partition wall, is constructed by (A) Laying bricks as stretchers in cement mortar (B) Laying bricks as headers in cement mortar (C) Reinforcing brick wall with iron straps (D) Constructing brick work within a wooden framework

Last Answer : Answer: Option D

The clinical advantage of porcelain laminate veneers over composite resin veneers is: A. Color stability and resistance to abrasion B. Availability of self-curing or light activated placement (yes but not necessary a clinical advantage) C. Minimal over-contouring of the treated teeth ( not necessarily true depends on the dentist's abilities) D. May be used in edge to edge occlusion or Class III relationships.

Description : The clinical advantage of porcelain laminate veneers over composite resin veneers is: A. Color stability and resistance to abrasion B. Availability of self-curing or light activated placement (yes but not ... dentist's abilities) D. May be used in edge to edge occlusion or Class III relationships.

Last Answer : A. Color stability and resistance to abrasion

Porcelain must not be contaminated by handling between which two stages: A. Pre-soldering and heat treatment B. Heat treatment and opaque /bake/ stages C. Opaque and bisque stages D. Bisque and glazing stages E. First opaque bake and second opaque bake

Description : Porcelain must not be contaminated by handling between which two stages: A. Pre-soldering and heat treatment B. Heat treatment and opaque /bake/ stages C. Opaque and bisque stages D. Bisque and glazing stages E. First opaque bake and second opaque bake

Last Answer : A. Pre-soldering and heat treatment

The advantage of firing porcelain in vacuum:** A. Reduces size of air-bubbles incorporated thus decreasing porosity B. Removes water before firing, increasing the hardness of porcelain C. Significantly lowers firing temperature

Description : The advantage of firing porcelain in vacuum:** A. Reduces size of air-bubbles incorporated thus decreasing porosity B. Removes water before firing, increasing the hardness of porcelain C. Significantly lowers firing temperature

Last Answer : A. Reduces size of air-bubbles incorporated thus decreasing porosity

A labially displaced anterior tooth is restored with a gold core porcelain jacket crown so that it is in line with the arch; the crown will appears: A. Short B. Long C. Narrow D. Wide

Description : A labially displaced anterior tooth is restored with a gold core porcelain jacket crown so that it is in line with the arch; the crown will appears: A. Short B. Long C. Narrow D. Wide

Last Answer : C. Narrow

The major cause of jacket crown breakage is, A. Inclusion of platinum foil B. Use of weak cementum C. Voids of porcelain D. Porcelain is thinner than 1mm

Description : The major cause of jacket crown breakage is, A. Inclusion of platinum foil B. Use of weak cementum C. Voids of porcelain D. Porcelain is thinner than 1mm

Last Answer : D. Porcelain is thinner than 1mm

Rough surface/Porosity of porcelain is a result of: A. Lack of compression/ condensation B. Sudden high temperature

Description : Rough surface/Porosity of porcelain is a result of: A. Lack of compression/ condensation B. Sudden high temperature

Last Answer : A. Lack of compression/ condensation

What is NOT A SIGN of neurological trauma:** A. Excitement B. Shock C. Improper eye sight D. Leaning E. Sever headache F. Vomiting G. Euphonia es un pajaro H. Fixed dilated pupils

Description : What is NOT A SIGN of neurological trauma:** A. Excitement B. Shock C. Improper eye sight D. Leaning E. Sever headache F. Vomiting G. Euphonia es un pajaro H. Fixed dilated pupils

Last Answer : G. Euphonia es un pajaro

The removable partial denture requires relining what would be the most appropriate action, A. take a new impression by asking the patient to occlude on it B. Provide equal space (maybe it was thickness) between denture and gingival tissues. C. Make sure the framework and retainers are seated in place before taking impression

Description : The removable partial denture requires relining what would be the most appropriate action, A. take a new impression by asking the patient to occlude on it B. Provide equal space (maybe it was ... gingival tissues. C. Make sure the framework and retainers are seated in place before taking impression

Last Answer : C. Make sure the framework and retainers are seated in place before taking impression

The means by which one part of a partial denture framework opposes the action of the retainer in faction is:** A. Tripoding B. Reciprocation C. Stress breaking D. Indirect retention

Description : The means by which one part of a partial denture framework opposes the action of the retainer in faction is:** A. Tripoding B. Reciprocation C. Stress breaking D. Indirect retention

Last Answer : B. Reciprocation

Which of the following areas CANNOT be determined by survey analysis of partially edentulous cast? A. Areas to be revealed as blocked out to properly located rigid parts of a frame work B. Areas to be shaped to properly located rigid parts of framework C. Areas used for guideline planes D. Areas used for retention E. Areas used for support F. Depth of rest seats

Description : Which of the following areas CANNOT be determined by survey analysis of partially edentulous cast? A. Areas to be revealed as blocked out to properly located rigid parts of a frame work B. Areas to be ... planes D. Areas used for retention E. Areas used for support F. Depth of rest seats

Last Answer : F. Depth of rest seats

The most common cause of RCT “Root Canal Treatment” failure is: A. The canal not filled completely (Short obturation) B. Over filled canals

Description : The most common cause of RCT “Root Canal Treatment” failure is: A. The canal not filled completely (Short obturation) B. Over filled canals

Last Answer : A. The canal not filled completely (Short obturation)

The most common cause of failure of the IDN “Inferior Dental Nerve” block is, A. Injecting too low B. Injecting too high

Description : The most common cause of failure of the IDN “Inferior Dental Nerve” block is, A. Injecting too low B. Injecting too high

Last Answer : A. Injecting too low

Which of the listed conditions might contribute to very rapid wearing of a DC machine's commutator bars? A. A grounded commutator bar B. Using improper carbon brushes C. Aligning the front and rear mica V-rings improperly D. An open circuit in the armature

Description : Which of the listed conditions might contribute to very rapid wearing of a DC machine's commutator bars? A. A grounded commutator bar B. Using improper carbon brushes C. Aligning the front and rear mica V-rings improperly D. An open circuit in the armature

Last Answer : Answer: B

Basal cell carcinoma is characterised by, a.Rapid growth and metastasis. b.Local cutaneous invasion. c. Inability to invade bone. d.Poor prognosis. e.Radiation resistance. f.Can not metastasise to the bone.

Description : Basal cell carcinoma is characterised by, a.Rapid growth and metastasis. b.Local cutaneous invasion. c. Inability to invade bone. d.Poor prognosis. e.Radiation resistance. f.Can not metastasise to the bone.

Last Answer : b.Local cutaneous invasion.

As far as localised alveolar osteitis is concerned; which one of the following is true? A. The incidence in the mandible and maxilla is similar B. The prophylactic prescription of antibiotics prior to extraction reduces the incidence. C. Excessive fibrinolysis is the likely aetiology D. Purulent exudate must be seen for a diagnosis and irrigation is mandatory E. Zn oxide eugenol and alvogyl dressing promote a rapid bone growth

Description : As far as localised alveolar osteitis is concerned; which one of the following is true? A. The incidence in the mandible and maxilla is similar B. The prophylactic prescription of antibiotics ... and irrigation is mandatory E. Zn oxide eugenol and alvogyl dressing promote a rapid bone growth

Last Answer : C. Excessive fibrinolysis is the likely aetiology

As far as localised alveolar osteitis (dry socket) is concerned; which one of the following is true? M07 A. The incidence in the mandible and maxilla is similar B. The prophylactic prescription of antibiotics prior to extraction reduces the incidence. C. Excessive fibrinolysis is the likely aetiology D. Purulent exudate must be seen for a diagnosis and irrigation is mandatory E. Zinc oxide eugenol and alvogyl dressing promote a rapid bone growth

Description : As far as localised alveolar osteitis (dry socket) is concerned; which one of the following is true? M07 A. The incidence in the mandible and maxilla is similar B. The prophylactic ... diagnosis and irrigation is mandatory E. Zinc oxide eugenol and alvogyl dressing promote a rapid bone growth

Last Answer : C. Excessive fibrinolysis is the likely aetiology

Basal cell carcinoma is characterised by, A. Rapid growth and metastasis B. Local cutaneous invasion C. Inability to invade bone D. Poor prognosis E. Radiation resistance F. Can not metastasise to the bon

Description : Basal cell carcinoma is characterised by, A. Rapid growth and metastasis B. Local cutaneous invasion C. Inability to invade bone D. Poor prognosis E. Radiation resistance F. Can not metastasise to the bon

Last Answer : B. Local cutaneous invasion

Describe with reasons the failure of porcelain insulators.

Description : Describe with reasons the failure of porcelain insulators.

Last Answer : The reasons the failure of porcelain insulators : -  1. Manufacturing Defect:- Insulator may fail due to manufacturing defect. So, it must be tested before use.  2. Uneven Expansion and Contraction ... use of insulator for a long period, its dielectric strength reduces. So, it may fail insulator. 

Which of the following is not likely to be the cause of failure of antimicrobial therapy of an acute infection: A. Improper selection of drug and dose B. Acquisition of resistance during treatment C. Failure to drain the pus D. Uncontrolled diabetes mellitus

Description : Which of the following is not likely to be the cause of failure of antimicrobial therapy of an acute infection: A. Improper selection of drug and dose B. Acquisition of resistance during treatment C. Failure to drain the pus D. Uncontrolled diabetes mellitus

Last Answer : B. Acquisition of resistance during treatment

Defect of lack of fusion is mainly due to? (i) Improper heating.* (ii) Improper Gap (iii) Improper grinding (iv) None of above

Description : Defect of lack of fusion is mainly due to? (i) Improper heating.* (ii) Improper Gap (iii) Improper grinding (iv) None of above

Last Answer : (i) Improper heating.*

A vital tooth has a crown cemented to a pin-retained amalgam core; where does a failure occur: A. Between crown and cement B. Between core and cement C. In the crown and the root D. In the core and the margin preparation

Description : A vital tooth has a crown cemented to a pin-retained amalgam core; where does a failure occur: A. Between crown and cement B. Between core and cement C. In the crown and the root D. In the core and the margin preparation

Last Answer : B. Between core and cement

The concomitant perio-periapical lesion as the cause of endodontic failure: A. Cannot be discovered prior to endo treatment B. May be discovered prior to endo treatment C. Is most commonly found in maxillary teeth D. Is most commonly found in mandibular teeth E. None of the above

Description : The concomitant perio-periapical lesion as the cause of endodontic failure: A. Cannot be discovered prior to endo treatment B. May be discovered prior to endo treatment C. Is most commonly found in maxillary teeth D. Is most commonly found in mandibular teeth E. None of the above

Last Answer : B. May be discovered prior to endo treatment

.In primary teeth, failure of Ca(OH)2 pulpotomy is MOST likely to produce:** A. External resorption B. Internal resorption C. Necrosis of the pulp D. Ankylosis

Description : .In primary teeth, failure of Ca(OH)2 pulpotomy is MOST likely to produce:** A. External resorption B. Internal resorption C. Necrosis of the pulp D. Ankylosis

Last Answer : B. Internal resorption

Radiopaque lesions are seen in: A. Multiple myeloma B. Paget’s disease C. Hyperparathyroidism D. Chronic renal failure

Description : Radiopaque lesions are seen in: A. Multiple myeloma B. Paget’s disease C. Hyperparathyroidism D. Chronic renal failure

Last Answer : B. Paget’s disease

Signs and symptoms that commonly suggest cardiac failure in a patient being assessed for oral surgery are, A. Elevated temperature and nausea B. Palpitations and malaise C. Ankle oedema and dyspnoea D. Erythema and pain E. Pallor and tremor

Description : Signs and symptoms that commonly suggest cardiac failure in a patient being assessed for oral surgery are, A. Elevated temperature and nausea B. Palpitations and malaise C. Ankle oedema and dyspnoea D. Erythema and pain E. Pallor and tremor

Last Answer : C. Ankle oedema and dyspnoea

The disadvantage of heating the impression compound in a water bath is: A. It may become brittle B. It may become grainy C. Lower moles with constituents are leached out D. The plasticity of the compound may be altered E. All of the above

Description : The disadvantage of heating the impression compound in a water bath is: A. It may become brittle B. It may become grainy C. Lower moles with constituents are leached out D. The plasticity of the compound may be altered E. All of the above

Last Answer : D. The plasticity of the compound may be altered

In a cartridge-type fuse, the metal element is contained in a ___________________. A. porcelain window B. thermal cut out C. fiber tube D. flasher device

Description : In a cartridge-type fuse, the metal element is contained in a ___________________. A. porcelain window B. thermal cut out C. fiber tube D. flasher device

Last Answer : Answer: C

An advantage of metal. ceramic crowns, compared wit full ceramic crowns for restoring anterior teeth is, A. Palatal reduction may be of minimal thickness. B. Overall conservative for tooth structure. C. Ability to watch the appearance of adjacent natural teeth. D. Less laboratory time.

Description : An advantage of metal. ceramic crowns, compared wit full ceramic crowns for restoring anterior teeth is, A. Palatal reduction may be of minimal thickness. B. Overall conservative for tooth structure. C. Ability to watch the appearance of adjacent natural teeth. D. Less laboratory time.

Last Answer : A. Palatal reduction may be of minimal thickness.

In cementing Maryland or Roche bridges, the effect is generally to, a. Lighten the colour of the teeth by the opacity of the cement b. Darken the colour of the abutment by the presence of metal on the lingual c. Have no detrimental colour effect. d. Darken the abutment teeth by incisal metal coverage

Description : In cementing Maryland or Roche bridges, the effect is generally to, a. Lighten the colour of the teeth by the opacity of the cement b. Darken the colour of the abutment by the presence ... lingual c. Have no detrimental colour effect. d. Darken the abutment teeth by incisal metal coverage

Last Answer : c. Have no detrimental colour effect.

What is the best way to get an optimum adoption of ceramic to metal, A. Slow firing B. High compression

Description : What is the best way to get an optimum adoption of ceramic to metal, A. Slow firing B. High compression

Last Answer : A. Slow firing

The ductility of metal is usually expressed in terms of the: A. Yield strength (point where the material is not longer elastic) B. Percent elongation C. Modulus of elasticity (stiffness of the material)

Description : The ductility of metal is usually expressed in terms of the: A. Yield strength (point where the material is not longer elastic) B. Percent elongation C. Modulus of elasticity (stiffness of the material)

Last Answer : B. Percent elongation

You can increase the retention of a Maryland bridge by: A. Incorporating mesh work in wax pattern B. Perforation techniques in the metal cast

Description : You can increase the retention of a Maryland bridge by: A. Incorporating mesh work in wax pattern B. Perforation techniques in the metal cast

Last Answer : A. Incorporating mesh work in wax pattern

After making an impression to reline an RPD the dentist notes that the indirect retainers are not resting on the tooth. To avoid this, what process should have undertaken initially: A. Ask patient to bite firmly while impression is setting B. Hold the metal base frame against the abutment tooth while setting C. Fabricate new denture D. Add impression material and close the gap

Description : After making an impression to reline an RPD the dentist notes that the indirect retainers are not resting on the tooth. To avoid this, what process should have undertaken initially: A. Ask ... abutment tooth while setting C. Fabricate new denture D. Add impression material and close the gap

Last Answer : B. Hold the metal base frame against the abutment tooth while setting

Where do Maryland bridges lose retention often: A. Resin-metal B. Resin enamel C. Resin layer

Description : Where do Maryland bridges lose retention often: A. Resin-metal B. Resin enamel C. Resin layer

Last Answer : A. Resin-metal

An advantage of metal-ceramic crowns, compared wit full ceramic crowns for restoring anterior teeth is, A. Palatal reduction may be of minimal thickness B. Overall conservative for tooth structure C. Ability to watch the appearance of adjacent natural teeth D. Less laboratory time

Description : An advantage of metal-ceramic crowns, compared wit full ceramic crowns for restoring anterior teeth is, A. Palatal reduction may be of minimal thickness B. Overall conservative for tooth structure C. Ability to watch the appearance of adjacent natural teeth D. Less laboratory time

Last Answer : A. Palatal reduction may be of minimal thickness

Wrought metal is to be, A. Marble B. Quenched C. Subjected /undergone/ to cold treatment during processing (annealed)

Description : Wrought metal is to be, A. Marble B. Quenched C. Subjected /undergone/ to cold treatment during processing (annealed)

Last Answer : C. Subjected /undergone/ to cold treatment during processing (annealed)

In planning and construction of a cast metal partial denture the study cast, M07 A. facilitate the construction of custom/special trays B. minimize the need for articulating C. provide only limited information about inter ridge distance, which is best assessed clinically D. can be used as a working cast when duplicating facilities are not available

Description : In planning and construction of a cast metal partial denture the study cast, M07 A. facilitate the construction of custom/special trays B. minimize the need for articulating C. provide only ... best assessed clinically D. can be used as a working cast when duplicating facilities are not available

Last Answer : A. facilitate the construction of custom/special trays

Which of the following statements about head injury and concomitant hyponatremia are true? A. There are no primary alterations in cardiovascular signs. B. Signs of increased intracranial pressure may be masked by the hyponatremia. C. Oliguric renal failure is an unlikely complication. D. Rapid correction of the hyponatremia may prevent central pontine injury. E. This patient is best treated by restriction of water intake.

Description : Which of the following statements about head injury and concomitant hyponatremia are true? A. There are no primary alterations in cardiovascular signs. B. Signs of increased intracranial pressure may be ... central pontine injury. E. This patient is best treated by restriction of water intake.

Last Answer : Answer: A DISCUSSION: Acute symptomatic hyponatremia is characterized by central nervous system signs of increased intracranial pressure. Changes in blood pressure and pulse are secondary to ... lead to central pontine myelinolysis. Oliguric renal failure may rapidly develop in severe hyponatremia

Select the correct statement with respect to disorders of muscles in humans. (a) Failure of neuromuscular transmission in myasthenia gravis can prevent normal swallowing. (b) Accumulation of urea and creatine in the joints causes their inflammation. (c) An overdose of vitamin D causes osteoporosis. (d) Rapid contractions of skeletal muscles cause muscle dystrophy

Description : Select the correct statement with respect to disorders of muscles in humans. (a) Failure of neuromuscular transmission in myasthenia gravis can prevent normal swallowing. (b) Accumulation of ... of vitamin D causes osteoporosis. (d) Rapid contractions of skeletal muscles cause muscle dystrophy

Last Answer : (a) Failure of neuromuscular transmission in myasthenia gravis can prevent normal swallowing.

Intravenous furosemide promptly mitigates dyspnoea in acute left ventricular failure by: A. Producing bronchodilatation B. Causing rapid diuresis and reducing circulating blood volume C. Increasing venous capacitance and reducing cardiac preload. D. Stimulating left ventricular contractility

Description : Intravenous furosemide promptly mitigates dyspnoea in acute left ventricular failure by: A. Producing bronchodilatation B. Causing rapid diuresis and reducing circulating blood volume C. Increasing venous capacitance and reducing cardiac preload. D. Stimulating left ventricular contractility

Last Answer : C. Increasing venous capacitance and reducing cardiac preload.

The following apply to use of spironolactone in CHF except: A. It is indicated only in NYHA class III/IV cases as additional drug to conventional therapy B. It affords prognostic benefit in severe heart failure over and above that afforded by ACE inhibitors C. It helps overcome refractoriness to diuretics D. It affords rapid symptomatic relief

Description : The following apply to use of spironolactone in CHF except: A. It is indicated only in NYHA class III/IV cases as additional drug to conventional therapy B. It affords prognostic benefit in ... by ACE inhibitors C. It helps overcome refractoriness to diuretics D. It affords rapid symptomatic relief

Last Answer : D. It affords rapid symptomatic relief

Glyceryl trinitrate is used in CHF for: A. Routine treatment of mild to moderate chronic heart failure B. Rapid symptom relief in acute left ventricular failure C. Arresting disease progression D. Both 'A' and 'B'

Description : Glyceryl trinitrate is used in CHF for: A. Routine treatment of mild to moderate chronic heart failure B. Rapid symptom relief in acute left ventricular failure C. Arresting disease progression D. Both 'A' and 'B'

Last Answer : D. Both 'A' and 'B