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

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

1 Answer

Answer :

A. Lack of compression/ condensation
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Related questions

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

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

The effect of the temperature rising above 100ºC on heat-cured denture-base acrylic resins is: A. Produces porosity on the external portion of the resin. B. Produces porosity on the internal portion of the resin. C. Produces porosity on the surface of the resin. D. Prevents porosity on the interior of the resin

Description : The effect of the temperature rising above 100ºC on heat-cured denture-base acrylic resins is: A. Produces porosity on the external portion of the resin. B. Produces porosity on the internal portion ... porosity on the surface of the resin. D. Prevents porosity on the interior of the resin

Last Answer : B. Produces porosity on the internal portion of the resin.

“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

In regard to the enamel surface: A. It is a perfect substance for bonding B. It does not conform to the bonding requirements C. It is the most inorganic, rough part D. It is free from contamination and roughness E. None of the above

Description : In regard to the enamel surface: A. It is a perfect substance for bonding B. It does not conform to the bonding requirements C. It is the most inorganic, rough part D. It is free from contamination and roughness E. None of the above

Last Answer : B. It does not conform to the bonding requirements

Why do you polish the teeth before seating of a partial denture: A. To smooth the rough surface B. To minimise the retention of plaque C. To increase the adoptability of occlusal rests

Description : Why do you polish the teeth before seating of a partial denture: A. To smooth the rough surface B. To minimise the retention of plaque C. To increase the adoptability of occlusal rests

Last Answer : B. To minimise the retention of plaque

Function of matrix band: A. Substitute for the missing wall so adequate condensation forces can be applied B. Permit re-establishment of proper contact lines C. Restrict extrusion of amalgam and prevent formation of an “overhang” D. Provide adequate physiological contour for the proximal surface E. Provide an acceptable surface texture to the proximal surface F. All of the above

Description : Function of matrix band: A. Substitute for the missing wall so adequate condensation forces can be applied B. Permit re-establishment of proper contact lines C. Restrict extrusion of amalgam and prevent ... E. Provide an acceptable surface texture to the proximal surface F. All of the above

Last Answer : F. All of the above

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

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

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

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

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

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

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

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

Last Answer : A. Improper metal framework

.In full dentures porosity in the most thickest area is due to:** A. Gaseous porosity B. Shrinkage porosity

Description : .In full dentures porosity in the most thickest area is due to:** A. Gaseous porosity B. Shrinkage porosity

Last Answer : A. Gaseous porosity

The contraction (Gaseous) porosity in inlays is related to:** A. Overheating of the alloy B. Molten gases C. Diameter of the sprue D. Overheating of investment

Description : The contraction (Gaseous) porosity in inlays is related to:** A. Overheating of the alloy B. Molten gases C. Diameter of the sprue D. Overheating of investment

Last Answer : B. Molten gases

Porosity in acrylic dentures is caused by, A. Contraction porosity in thickest point of the denture B. Insufficient pressure during flasking

Description : Porosity in acrylic dentures is caused by,  A. Contraction porosity in thickest point of the denture  B. Insufficient pressure during flasking 

Last Answer : A. Contraction porosity in thickest point of the denture  B. Insufficient pressure during flasking 

If the investment is burned out rapidly, what will happen: A. Back pressure porosity B. Cracking of the investment

Description : If the investment is burned out rapidly, what will happen: A. Back pressure porosity B. Cracking of the investment

Last Answer : B. Cracking of the investment

Which one of the following is the major disadvantage of stone dies used for crown fabrication, A. They lack accurate reproduction of surface details B. Their overall dimensions are slightly smaller than the original impression C. The strength of the stone D. The hazard of aspiration of toxic materials during trimming of the dies.

Description : Which one of the following is the major disadvantage of stone dies used for crown fabrication, A. They lack accurate reproduction of surface details B. Their overall dimensions are slightly smaller than ... of the stone D. The hazard of aspiration of toxic materials during trimming of the dies.

Last Answer : A. They lack accurate reproduction of surface details

Burnishing the amalgam after carving, what is the benefit? a.Completing the condensation at the marginal edges. b.eleminating excessive mercury

Description : Burnishing the amalgam after carving, what is the benefit? a.Completing the condensation at the marginal edges. b.eleminating excessive mercury

Last Answer : .Completing the condensation at the marginal edges.

The principal reasons for placing a gingival interproximal wedge in conjunction with a matrix for amalgam condensation are to: 1. separate the teeth slightly 2. keep the band tight at the gingival margin 3. contribute to the interproximal contact of the restoration 4. retract the gingival tissue a. 1,2,3 b. 1,2,4 c. 2,3,4 d. 1,3,4 e. all of the above

Description : The principal reasons for placing a gingival interproximal wedge in conjunction with a matrix for amalgam condensation are to: 1. separate the teeth slightly 2. keep the band tight at the gingival margin 3. contribute to the ... b. 1,2,4 c. 2,3,4 d. 1,3,4 e. all of the above

Last Answer : e. all of the above

Marginal leakage at the proximal gingival cavosurface of a recently restored class II can be caused by: I. Insufficient condensation II. First proximal increment was too large III. Neglecting to wedge the matrix IV. Hand manipulation instead of mechanical V. Debris contamination A. I, II, III B. II, III, IV C. I, II, V D. None of the above E. All of the above

Description : Marginal leakage at the proximal gingival cavosurface of a recently restored class II can be caused by: I. Insufficient condensation II. First proximal increment was too large III. Neglecting to wedge the matrix IV. Hand ... III, IV C. I, II, V D. None of the above E. All of the above

Last Answer : C. I, II, V

Which impression material should NOT be kept in water within on hour: (in another paper it was: 30 mins before pouring) A. Polyether B. Condensation silicone C. Polyvinyl silicone

Description : Which impression material should NOT be kept in water within on hour: (in another paper it was: 30  mins before pouring)  A. Polyether  B. Condensation silicone  C. Polyvinyl silicone 

Last Answer : A. Polyether 

An impression with elastomer in custom tray has been taken for crown preparation; it will be two days before the impression gets to the laboratory for construction of the crown. Which impression material is preferred? A. Polyether B. Thiokol or meraptan rubber C. Condensation silicone D. Vinyl polysiloxane

Description : An impression with elastomer in custom tray has been taken for crown preparation; it will be two days before the impression gets to the laboratory for construction of the crown. Which impression ... A. Polyether B. Thiokol or meraptan rubber C. Condensation silicone D. Vinyl polysiloxane

Last Answer : D. Vinyl polysiloxane

The technique of placing guttapercha cones against the root canal walls providing space for additional guttapercha is termed: A. Lateral Condensation B. One major Gutta Percha point C. Laterally above condensed

Description : The technique of placing guttapercha cones against the root canal walls providing space for additional guttapercha is termed: A. Lateral Condensation B. One major Gutta Percha point C. Laterally above condensed

Last Answer : A. Lateral Condensation

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

What is the best way to cement Maryland bridge, A. GIC B. Resin C. High compression restorative resin D. Zinc Phosphate cement E. Oxide Zinc and eugenol

Description : What is the best way to cement Maryland bridge, A. GIC B. Resin C. High compression restorative resin D. Zinc Phosphate cement E. Oxide Zinc and eugenol

Last Answer : B. Resin

In regard to carbide burs; the more number of cutting blades and low speed will result in: A. Less efficient cutting and a smoother surface B. Less efficient cutting and a rougher surface C. More efficient cutting and a smoother surface D. More efficient cutting and a rougher surface

Description : In regard to carbide burs; the more number of cutting blades and low speed will result in: A. Less efficient cutting and a smoother surface B. Less efficient cutting and a rougher surface C. More efficient cutting and a smoother surface D. More efficient cutting and a rougher surface

Last Answer : A. Less efficient cutting and a smoother surface

Why do we find increased porosity, yellowish tinge and lack of tensile strength in old paper?

Description : Why do we find increased porosity, yellowish tinge and lack of tensile strength in old paper?

Last Answer : Paper contains significant amount of lignin. Exposure of lignin to air and sunlight causes old paper to turn yellowish.

Which of the following defects are unlikely to be detected by normal radiographic technique? a) Intergranular corrosion cracking b) Porosity c) Slag d) Lack of penetration

Description : Which of the following defects are unlikely to be detected by normal radiographic technique? a) Intergranular corrosion cracking b) Porosity c) Slag d) Lack of penetration

Last Answer : a) Intergranular corrosion cracking

When is it acceptable for the patient to hold radiographic film packet in the patient’s mouth: A. Patient is very young and cannot understand direction B. Patient is physically handicapped and unable to hold the film C. Film should never be held by the dentist D. There is a lack of time and radiograph is essential

Description : When is it acceptable for the patient to hold radiographic film packet in the patient's mouth: A. Patient is very young and cannot understand direction B. Patient is physically handicapped and unable to ... never be held by the dentist D. There is a lack of time and radiograph is essential

Last Answer : C. Film should never be held by the dentist

As a general practitioner; you decide at an initial appointment that you can not handle a child due to lack of co-operation. Which of the following approaches would seem to be your alternative: A. Refer child to pedodontist B. Send child home until he/she cooperates C. Schedule child for General Anaesthetic session

Description : As a general practitioner; you decide at an initial appointment that you can not handle a child due to lack of co-operation. Which of the following approaches would seem to be your alternative: ... B. Send child home until he/she cooperates C. Schedule child for General Anaesthetic session

Last Answer : A. Refer child to pedodontist

While giving CPR which of the following is considered: a. It achieves 30% of cardiac output with 60 compressions per minute. b. It achieves normal blood oxygen levels with 12 reseparations per minute. c. You have to check compression point by thumbing before starting compression. d. Cardiac output has to be monitored regularly by checking radial pulse.

Description : While giving CPR which of the following is considered: a. It achieves 30% of cardiac output with 60 compressions per minute. b. It achieves normal blood oxygen levels with 12 reseparations ... starting compression. d. Cardiac output has to be monitored regularly by checking radial pulse.

Last Answer : c. You have to check compression point by thumbing before starting compression.

Compound is, A. Very accurate compression material B. Thermoplastic material

Description : Compound is, A. Very accurate compression material B. Thermoplastic material

Last Answer : B. Thermoplastic material

Which of the following is NOT a characteristic of glass ionomer cements? a. strong in compression but weaker in tension True b. the matrix is formed during the initial set of the cement c. sets via an ion exchange reaction that continues for at least 24 hours true d. suitable for use as a core build up material in anterior teeth

Description : Which of the following is NOT a characteristic of glass ionomer cements? a. strong in compression but weaker in tension True b. the matrix is formed during the initial set of the cement c. sets via ... for at least 24 hours true d. suitable for use as a core build up material in anterior teeth

Last Answer : d. suitable for use as a core build up material in anterior teeth

While giving CPR which of the following is correct: A. It achieves 30% of cardiac output with 60 compressions per minute B. It achieves normal blood oxygen levels with 12 reseparations per minute C. You have to check compression point by thumping before starting compression D. Cardiac output has to be monitored regularly by checking radial pulse.

Description : While giving CPR which of the following is correct: A. It achieves 30% of cardiac output with 60 compressions per minute B. It achieves normal blood oxygen levels with 12 ... thumping before starting compression D. Cardiac output has to be monitored regularly by checking radial pulse.

Last Answer : C. You have to check compression point by thumping before starting compression

At what rate should chest cardiac compression be done in an adult:** A. 12 times a minute B. 24 times a minute C. 50 times a minute D. 80 times a minute

Description : At what rate should chest cardiac compression be done in an adult:** A. 12 times a minute B. 24 times a minute C. 50 times a minute D. 80 times a minute

Last Answer : D. 80 times a minute

Close inspection of a failed metal part reveals artifacts on the fracture surface commonly referred to as "striations" or "beach marks". This indicates the component failed as a result of: w) Sudden overloading x) Cyclical loading y) Stress corrosion cracking z) None of the above

Description : Close inspection of a failed metal part reveals artifacts on the fracture surface commonly referred to as "striations" or "beach marks". This indicates the component failed as a result of: w) Sudden overloading x) Cyclical loading y) Stress corrosion cracking z) None of the above

Last Answer : ANSWER: X -- CYCLICAL LOADING

Which of the following is correct about Nitrous Oxide N2O: A. N2O has high analgesic and low anaesthetic property at its minimum anaesthetic dose. “Low MAC; Max Anaesthetic Concentration” B. Absolutely contraindicated in pregnancy C. Has low blood diffusibility and result in hypoxia D. It is good anaesthetic and low MAC

Description : Which of the following is correct about Nitrous Oxide N2O: A. N2O has high analgesic and low anaesthetic property at its minimum anaesthetic dose. Low MAC; Max Anaesthetic Concentration B. Absolutely ... C. Has low blood diffusibility and result in hypoxia D. It is good anaesthetic and low MAC

Last Answer : C. Has low blood diffusibility and result in hypoxia

The rate of emission of radiation by a body does not depend upon the (A) Wavelength of radiation (B) Surface temperature of the body (C) Nature of the surface (D) Shape and porosity of the body

Description : The rate of emission of radiation by a body does not depend upon the (A) Wavelength of radiation (B) Surface temperature of the body (C) Nature of the surface (D) Shape and porosity of the body

Last Answer : (D) Shape and porosity of the body

The rate of emission of radiation by a body does not depend upon the (A) Wavelength of radiation (B) Surface temperature of the body (C) Nature of the surface (D) Shape and porosity of the body

Description : The rate of emission of radiation by a body does not depend upon the (A) Wavelength of radiation (B) Surface temperature of the body (C) Nature of the surface (D) Shape and porosity of the body

Last Answer : (D) Shape and porosity of the body

The difference between smooth and rough endoplasmi reticulum is the lack of: a) ATP b) proteins c) ribosomes d) peroxisomes

Description : The difference between smooth and rough endoplasmi reticulum is the lack of: a) ATP b) proteins c) ribosomes d) peroxisomes

Last Answer : ANSWER: C -- RIBOSOMES

The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy-diagram represents (a) condensation of the refrigerant vapour (b) evaporation of the refrigerant liquid (c) compression of the refrigerant vapour (d) metering of the refrigerant liquid

Description : The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy-diagram represents (a) condensation of the refrigerant vapour (b) evaporation of the refrigerant liquid (c) compression of the refrigerant vapour (d) metering of the refrigerant liquid

Last Answer : Ans: b

A coalescer in a mixer-settler liquid-liquid extraction column (A) Comprises of thin bed of substances of extended surface having high porosity (B) Helps in increasing the bubble size entering the settler (C) Helps in increasing the settling rate of the bubbles (D) All 'a', 'b', & 'c'

Description :  A coalescer in a mixer-settler liquid-liquid extraction column (A) Comprises of thin bed of substances of extended surface having high porosity (B) Helps in increasing the bubble size entering the settler ... increasing the settling rate of the bubbles (D) All 'a', 'b', & 'c'

Last Answer : (D) All 'a', 'b', & 'c'

On X-ray, the buccal roots of 16 is considerably elongated; this is a result of, A. Too great vertical angulation B. Inadequate vertical angulation C. Excessive object film distance

Description : On X-ray, the buccal roots of 16 is considerably elongated; this is a result of, A. Too great vertical angulation B. Inadequate vertical angulation C. Excessive object film distance

Last Answer : B. Inadequate vertical angulation

Four year kid shows at your clinic with open bite as a result of thumb sucking, you notice a delayed speech ability, what would be your first management, A. Refer to a speech therapist B. Apply a removable habit inhibitor denture C. Apply a removable habit inhibitor denture and educate the parents about it so the kid will not be taking it off so often

Description : Four year kid shows at your clinic with open bite as a result of thumb sucking, you notice a delayed speech ability, what would be your first management, A. Refer to a speech therapist B. Apply ... inhibitor denture and educate the parents about it so the kid will not be taking it off so often

Last Answer : A. Refer to a speech therapist

As a result of wrong use of tooth brush the patients MOST probable complaint will be, A. Spontaneous pain or discomfort B. Occasional pain during brushing of the teeth C. Occasional pain during consumption of sweets

Description : As a result of wrong use of tooth brush the patients MOST probable complaint will be, A. Spontaneous pain or discomfort B. Occasional pain during brushing of the teeth C. Occasional pain during consumption of sweets

Last Answer : C. Occasional pain during consumption of sweets

the difficulty of placing matrices on deciduous dentition is a result of, A. The small mouth of kids which result in problem keeping the matrices in their mouths B. The occlusal convergence of the deciduous teeth

Description : the difficulty of placing matrices on deciduous dentition is a result of, A. The small mouth of kids which result in problem keeping the matrices in their mouths B. The occlusal convergence of the deciduous teeth

Last Answer : B. The occlusal convergence of the deciduous teeth