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

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
by

1 Answer

Answer :

C. Distortion of impression
by

Related questions

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

Distortion or change in shape of a cast partial denture clasp during its clinical use probably indicates that the: A. Ductility was too low B. Hardness was too great C. Ultimate tensile strength was too low D. Tension temperature was too high E. Elastic limit was exceeded

Description : Distortion or change in shape of a cast partial denture clasp during its clinical use probably indicates that the: A. Ductility was too low B. Hardness was too great C. Ultimate tensile strength was too low D. Tension temperature was too high E. Elastic limit was exceeded

Last Answer : E. Elastic limit was exceeded

In the construction of partial dentures the surveyor is not used to, A. Contour the wax as part of the fabrication of the working cast B. Locate the guide planes C. Determine the location of indirect retainers D. Identify any undesirable undercuts

Description : In the construction of partial dentures the surveyor is not used to, A. Contour the wax as part of the fabrication of the working cast B. Locate the guide planes C. Determine the location of indirect retainers D. Identify any undesirable undercuts

Last Answer : A. Contour the wax as part of the fabrication of the working cast

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 

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

To minimize the load on a free-end saddle partial denture: (distal extension saddle) A. Use teeth with narrow Buccal-Lingual dimension B. Use mucco-compressive impression

Description : To minimize the load on a free-end saddle partial denture: (distal extension saddle) A. Use teeth with narrow Buccal-Lingual dimension B. Use mucco-compressive impression

Last Answer : B. Use mucco-compressive impression

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

A crown casting with a chamfer margin fits the die; but in the mouth the casting is open approximately 0.3mm. A satisfactory fit and accurate physiological close of the gingival area of the crown can BEST be achieved by: A. Hand burnishing B. Mechanical burnishing C. Using finishing burs and points to remove the enamel margins on the tooth D. Making a new impression and remaking the crown E. Relieving the inside of the occlusal surface of the casting to allow for further

Description : A crown casting with a chamfer margin fits the die; but in the mouth the casting is open approximately 0.3mm. A satisfactory fit and accurate physiological close of the gingival area of the crown ... the crown E. Relieving the inside of the occlusal surface of the casting to allow for further

Last Answer : D. Making a new impression and remaking the crown

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

Why do you construct a lower removable partial denture with lingual bar: A. It is used when the space between raised floor, mouth and gingival margin is minimal B. Plaque accumulation is less than with lingual plate C. Should be made thicker when short

Description : Why do you construct a lower removable partial denture with lingual bar: A. It is used when the space between raised floor, mouth and gingival margin is minimal B. Plaque accumulation is less than with lingual plate C. Should be made thicker when short

Last Answer : B. Plaque accumulation is less than with lingual plate

Why would you invest the wax pattern as soon as possible in an indirect inlay fabrication: A. Minimise distortion B. Avoid contraction C. Avoid expansion

Description : Why would you invest the wax pattern as soon as possible in an indirect inlay fabrication: A. Minimise distortion B. Avoid contraction C. Avoid expansion

Last Answer : A. Minimise distortion

The setting expansion of casting investment is approximately A. 0 to 0.1% B. 0.1 to 0.5% C. 0.5 to 1% D. 1.1 to 1.6%

Description : The setting expansion of casting investment is approximately A. 0 to 0.1% B. 0.1 to 0.5% C. 0.5 to 1% D. 1.1 to 1.6%

Last Answer : B. 0.1 to 0.5%

When all other removable partial denture considerations remain unchanged; clasps constructed of which material can engage the deepest undercut: A. Chrome cobalt casts B. Nickel chrome casts C. Wrought stainless steel (0,5mm) D. Wrought gold

Description : When all other removable partial denture considerations remain unchanged; clasps constructed of which material can engage the deepest undercut: A. Chrome cobalt casts B. Nickel chrome casts C. Wrought stainless steel (0,5mm) D. Wrought gold

Last Answer : D. Wrought gold

When dry cast is immersed in water saturated with calcium sulphate:** A. There is contraction B. There is negligible expansion C. There is definite expansion D. There is no change E. None of the above

Description : When dry cast is immersed in water saturated with calcium sulphate:** A. There is contraction B. There is negligible expansion C. There is definite expansion D. There is no change E. None of the above

Last Answer : B. There is negligible expansion

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 removable partial dentures, the principle of an indirect retainer is that it: a. Stabilises against lateral movement b. Prevents settling of major connectors c. Restricts tissue movement at the distal extension base of the partial denture. d. Minimises movement of the base away from the supporting tissue

Description : In removable partial dentures, the principle of an indirect retainer is that it: a. Stabilises against lateral movement b. Prevents settling of major connectors c. Restricts tissue movement at ... base of the partial denture. d. Minimises movement of the base away from the supporting tissue

Last Answer : d. Minimises movement of the base away from the supporting tissue

The auxiliary occlusal rest on teeth for partial denture should be placed: A. Away from edentulous space B. Adjacent to edentulous space C. Near fulcrum line D. Away from fulcrum line

Description : The auxiliary occlusal rest on teeth for partial denture should be placed: A. Away from edentulous space B. Adjacent to edentulous space C. Near fulcrum line D. Away from fulcrum line

Last Answer : A. Away from edentulous space

In removable partial denture, the principle of an indirect retainer is to: A. Stabilise against lateral movement B. Prevent settling of major connectors C. Restrict tissue movement at the distal extension base of the partial denture D. Minimise movement of the base away from the supporting tissue

Description : In removable partial denture, the principle of an indirect retainer is to: A. Stabilise against lateral movement B. Prevent settling of major connectors C. Restrict tissue movement at the distal ... base of the partial denture D. Minimise movement of the base away from the supporting tissue

Last Answer : D. Minimise movement of the base away from the supporting tissue

When describing a removable partial denture, the minor connector refers to:** A. Rigid components anterior to the premolar teeth B. Flexible components, in contrast to rigid major connectors C. Smaller connectors which connect denture components to the major connector D. The components of the denture base which provides reciprocation

Description : When describing a removable partial denture, the minor connector refers to:** A. Rigid components anterior to the premolar teeth B. Flexible components, in contrast to rigid major connectors ... components to the major connector D. The components of the denture base which provides reciprocation

Last Answer : C. Smaller connectors which connect denture components to the major connector

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

Why would you decide to replace the anterior missing teeth for partial denture using bridge: A. Aesthetic B. Overjet C. Overbite

Description : Why would you decide to replace the anterior missing teeth for partial denture using bridge: A. Aesthetic B. Overjet C. Overbite

Last Answer : A. Aesthetic

Periodontal damage to abutment teeth of partial denture with distal extension can best be avoided by, A. Applying Stressbreakers B. Employing bar s on all abutment teeth C. Maintaining tissue support of the distal extension D. Clasping at least two teeth for each edentulous area E. Maintaining the clasp arms on all abutment teeth at the ideal degree of tension

Description : Periodontal damage to abutment teeth of partial denture with distal extension can best be avoided by, A. Applying Stressbreakers B. Employing bar s on all abutment teeth C. Maintaining tissue support ... area E. Maintaining the clasp arms on all abutment teeth at the ideal degree of tension

Last Answer : C. Maintaining tissue support of the distal extension

A cast crown fits on the die but not on the tooth, the discrepancy is about 0.3mm, what would you do: A. Relieve cast from the inside B. Take a new impression and make new crown C. Burnish margins D. Use thick mix of cement

Description : A cast crown fits on the die but not on the tooth, the discrepancy is about 0.3mm, what would you do: A. Relieve cast from the inside B. Take a new impression and make new crown C. Burnish margins D. Use thick mix of cement

Last Answer : B. Take a new impression and make new crown

What is TRUE about vertical dimension: A. Does not change for the whole life B. Decreases when head is tilted back (is the opposite and if is tilted forward decreases, patient supine reduced, stress and pain also reduced) C. Increases when a lower denture is placed in mouth

Description : What is TRUE about vertical dimension:  A. Does not change for the whole life   B. Decreases when head is tilted back (is the opposite and if is tilted forward decreases, patient  supine reduced, stress and pain also reduced)  C. Increases when a lower denture is placed in mouth 

Last Answer : C. Increases when a lower denture is placed in mouth 

Retention for occlusal amalgam cavities in premolars is BEST provided by A. Slightly undercutting of walls with inversed cone bur B. Mesial and distal undercuts C. Buccal and lingual undercuts

Description : Retention for occlusal amalgam cavities in premolars is BEST provided by A. Slightly undercutting of walls with inversed cone bur B. Mesial and distal undercuts C. Buccal and lingual undercuts

Last Answer : C. Buccal and lingual undercuts

When primary molars are prepared for stainless steel crowns, should the depth for reduction of the proximal surface be similar to the depth of the buccal and lingual surfaces? A. Yes; reduction of all wall is similar for best retention B. No, proximal reduction is greater to allow the crown to pass the contact area C. No, the buccal surfaces has the greatest reduction to remove the cervical bulge D. Yes, all undercuts are uniformly removed so that the steel crown can be seated E. No, because of lateral constriction, the lingual surface needs greatest reduction

Description : When primary molars are prepared for stainless steel crowns, should the depth for reduction of the proximal surface be similar to the depth of the buccal and lingual surfaces? A. Yes; reduction ... can be seated E. No, because of lateral constriction, the lingual surface needs greatest reduction

Last Answer : B. No, proximal reduction is greater to allow the crown to pass the contact area

.Oil or water on impression for treatment casts causes: A. An increase of the quality B. No alteration C. A decrease of the quality D. Bubbles on the cast

Description : .Oil or water on impression for treatment casts causes: A. An increase of the quality B. No alteration C. A decrease of the quality D. Bubbles on the cast

Last Answer : C. A decrease of the quality

Fusion temperature of impression compound should occur: A. Below mouth temperature B. Above mouth temperature C. As of the skin temperature D. At the room temperature E. None of the above

Description : Fusion temperature of impression compound should occur: A. Below mouth temperature B. Above mouth temperature C. As of the skin temperature D. At the room temperature E. None of the above

Last Answer : B. Above mouth temperature

During mouth preparation for RPD on tooth adjacent to edentulous area. There is dentine exposure: A. Restoration is required B. Proceed with rest seat preparation and fabrication if involved area is not more than 2mm

Description : During mouth preparation for RPD on tooth adjacent to edentulous area. There is dentine exposure: A. Restoration is required B. Proceed with rest seat preparation and fabrication if involved area is not more than 2mm

Last Answer : A. Restoration is required

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

Angular cheilitis in edentulous patient with complete denture is a result of: A. Deficiency of Rivoflavin vitamin B2 B. Low vertical dimension

Description : Angular cheilitis in edentulous patient with complete denture is a result of: A. Deficiency of Rivoflavin vitamin B2 B. Low vertical dimension

Last Answer : B. Low vertical dimension

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

Denture stomatitis is commonly associated with, A. The continuous wearing of removable orthodontic appliances in otherwise healthy patient B. The proliferation of hypertrophic tissue at the denture periphery C. The overgrowth of some constituents of oral normal microflora D. Allergy to denture base material

Description : Denture stomatitis is commonly associated with, A. The continuous wearing of removable orthodontic appliances in otherwise healthy patient B. The proliferation of hypertrophic tissue at the denture ... overgrowth of some constituents of oral normal microflora D. Allergy to denture base material

Last Answer : C. The overgrowth of some constituents of oral normal microflora

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

A solid metallic block weighing 5 kg has an initial temperature of 500°C. 40 kg of water initially at 25°C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. Specific heat of block material is 0.4 kJ.kg-1. K-1. Ignoring the effect of expansion and contraction and also the heat capacity to tank, the total entropy change in kJ.kg-1, K-1is (A) -1.87 (B) 0 (C) 1.26 (D) 3.91

Description : A solid metallic block weighing 5 kg has an initial temperature of 500°C. 40 kg of water initially at 25°C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. ... .kg-1, K-1is (A) -1.87 (B) 0 (C) 1.26 (D) 3.91

Last Answer : (B) 0

Elastomers are:** A. Hydrophilic B. Hydrophobic C. Water-loving impression material D. Potassium alginates E. None of the above

Description : Elastomers are:** A. Hydrophilic B. Hydrophobic C. Water-loving impression material D. Potassium alginates E. None of the above

Last Answer : B. Hydrophobic

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

Cast iron and steel pipes are produced by __________ casting. (A) Die (B) Investment (C) Slush(D) True centrifugal

Description : Cast iron and steel pipes are produced by __________ casting. (A) Die (B) Investment (C) Slush (D) True centrifugal

Last Answer : (D) True centrifugal

Depolarizing neuromuscular blockers differ from competitive blockers in the following attributes except: A. They induce contraction of isolated frog rectus abdominis muscle B. Ether anaesthesia intensifies block produced by them C. Tetanic nerve stimulation during partial depolarizing block produces well sustained contraction D. Neostigmine does not reverse block produced by them

Description : Depolarizing neuromuscular blockers differ from competitive blockers in the following attributes except: A. They induce contraction of isolated frog rectus abdominis muscle B. Ether anaesthesia ... produces well sustained contraction D. Neostigmine does not reverse block produced by them

Last Answer : B. Ether anaesthesia intensifies block produced by them

Fatigue limit improvement by over stressing the metal by successively increasing the load is called coaxing. In fatigue failure, the material fails (A) Below the yield point (B) Above the yield point (C) Below the elastic limit (D) At the elastic limit

Description : Fatigue limit improvement by over stressing the metal by successively increasing the load is called coaxing. In fatigue failure, the material fails (A) Below the yield point (B) Above the yield point (C) Below the elastic limit (D) At the elastic limit

Last Answer : Option A

Acid conditioning of enamel and eroded dentine: A. Provides an none traumatic, conservative clinical approach to the bonding of restorative material B. Is a traumatic approach to bonding materials C. Is not a safe and simple method of bonding D. Bonding fails to produce a highly significant retention and good marginal integrity and clinical durability E. None of the above

Description : Acid conditioning of enamel and eroded dentine: A. Provides an none traumatic, conservative clinical approach to the bonding of restorative material B. Is a traumatic approach to bonding ... highly significant retention and good marginal integrity and clinical durability E. None of the above

Last Answer : A. Provides an none traumatic, conservative clinical approach to the bonding of restorative material

The hamular notch is important in full denture construction because it aids in the setting position of the artificial teeth A. First statement is true, but the reason given is false B. Both statements are true C. Both statements are untrue

Description : The hamular notch is important in full denture construction because it aids in the setting position of the artificial teeth A. First statement is true, but the reason given is false B. Both statements are true C. Both statements are untrue

Last Answer : A. First statement is true, but the reason given is false

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

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

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

Should old dentures be used to get impression for a new denture when they are 17 yrs old It doesn't seem like they can get a true impression.?

Description : Should old dentures be used to get impression for a new denture when they are 17 yrs old It doesn't seem like they can get a true impression.?

Last Answer : I would try to get a new impression since your last denture may have been used when you are younger since your mouth was growing at the time.

Uniform ramming of sand in green sand moulding process leads to (A) Reduced chance of gas porosity (B) Greater dimensional stability of the casting (C) Uniform flow of molten metal into the mould cavity (D) Less sand expansion type of casting defect

Description : Uniform ramming of sand in green sand moulding process leads to (A) Reduced chance of gas porosity (B) Greater dimensional stability of the casting (C) Uniform flow of molten metal into the mould cavity (D) Less sand expansion type of casting defect

Last Answer : Option B

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