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

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

1 Answer

Answer :

B. Improper cavity preparation
by

Related questions

Reduced occlusal area means: A. More fracture potential for amalgam B. Less fracture potential for amalgam C. Pulpal involvement D. Perio involvement E. None of the above

Description : Reduced occlusal area means: A. More fracture potential for amalgam B. Less fracture potential for amalgam C. Pulpal involvement D. Perio involvement E. None of the above

Last Answer : B. Less fracture potential for amalgam

While you finish a class I cavity, the enamel is sound but you notice a brown line in the dentine and on the Dento-enamel junction, what is your response, A. You leave it and complete the final restoration B. You extend your preparation and clean it C. You apply a cover of varnish

Description : While you finish a class I cavity, the enamel is sound but you notice a brown line in the dentine and on the Dento-enamel junction, what is your response, A. You leave it and complete the final restoration B. You extend your preparation and clean it C. You apply a cover of varnish

Last Answer : B. You extend your preparation and clean it

A patient complains of sensitivity, on examination you find a composite filling restoring a good cavity preparation without any secondary caries; what is your next step: A. Extirpate the pulp that is obviously inflamed B. Place ZOE dressing to sedate the pulp C. Ask patient to come back in six months D. Repeat restoration

Description : A patient complains of sensitivity, on examination you find a composite filling restoring a good cavity preparation without any secondary caries; what is your next step: A. Extirpate the pulp that is obviously ... to sedate the pulp C. Ask patient to come back in six months D. Repeat restoration

Last Answer : B. Place ZOE dressing to sedate the pulp

At which angle to the external surface of proximal cavity walls should a class II preparation for amalgam be finished A. An acute angle B. An obtuse angle si es el cajon proximal C. A right angle D. An angle of 45°

Description : At which angle to the external surface of proximal cavity walls should a class II preparation for amalgam be finished A. An acute angle B. An obtuse angle si es el cajon proximal C. A right angle D. An angle of 45°

Last Answer : B. An obtuse angle si es el cajon proximal

The most common cause of fracture at the isthmus of class II dental amalgam restoration is: A. Delayed expansion B. Inadequate depth at the isthmus area C. Inadequate width at the isthmus area

Description : The most common cause of fracture at the isthmus of class II dental amalgam restoration is: A. Delayed expansion B. Inadequate depth at the isthmus area C. Inadequate width at the isthmus area

Last Answer : B. Inadequate depth at the isthmus area

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

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

Amalgam restoration, when do you have to replace it? a. Ditching of the edges. b. The probe penetrates the area between the margin and tooth tissue. c. Fissure of the surface of the amalgam. d. When there is chronic inflammation of the pulp.

Description : Amalgam restoration, when do you have to replace it? a. Ditching of the edges. b. The probe penetrates the area between the margin and tooth tissue. c. Fissure of the surface of the amalgam. d. When there is chronic inflammation of the pulp.

Last Answer : c. Fissure of the surface of the amalgam.

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

Occasional sensitivity in a shallow class I amalgam restoration after two days would be managed by: A. Replace old filing immediately B. Oxide Zinc and eugenol C. Using thicker mix of cements D. Tell patient the discomfort will disappear after 4 t o6 weeks E. Ledermix

Description : Occasional sensitivity in a shallow class I amalgam restoration after two days would be managed by: A. Replace old filing immediately B. Oxide Zinc and eugenol C. Using thicker mix of cements D. Tell patient the discomfort will disappear after 4 t o6 weeks E. Ledermix

Last Answer : D. Tell patient the discomfort will disappear after 4 t o6 weeks

The less mercury remaining in condensed amalgam: A. The stronger the restoration which contains fewer matrix alloys and fewer voids B. The weaker the restoration C. The more matrix alloys D. The more voids E. None of the above

Description : The less mercury remaining in condensed amalgam: A. The stronger the restoration which contains fewer matrix alloys and fewer voids B. The weaker the restoration C. The more matrix alloys D. The more voids E. None of the above

Last Answer : A. The stronger the restoration which contains fewer matrix alloys and fewer voids

Pin Restoration with which material has the best retention: A. Amalgam B. Gold inlay C. Composite D. Glass Ionomer

Description : Pin Restoration with which material has the best retention:  A. Amalgam  B. Gold inlay  C. Composite  D. Glass Ionomer 

Last Answer : C. Composite 

Which of the following restoration material’s strength is not effected by pins: A. Amalgam B. Composite resin

Description : Which of the following restoration material’s strength is not effected by pins: A. Amalgam B. Composite resin

Last Answer : B. Composite resin

The retention pin in an amalgam restoration should be placed, A. Parallel to the outer wall B. Parallel to the long axis of tooth

Description : The retention pin in an amalgam restoration should be placed, A. Parallel to the outer wall B. Parallel to the long axis of tooth

Last Answer : A. Parallel to the outer wall

For an amalgam restoration of a weakened cusp you should, A. reduce cusp by 2mm on a flat base for more resistance B. reduce cusp by 2mm following the outline of the cusp C. reduce 2mm for retention form

Description : For an amalgam restoration of a weakened cusp you should, A. reduce cusp by 2mm on a flat base for more resistance B. reduce cusp by 2mm following the outline of the cusp C. reduce 2mm for retention form

Last Answer : A. reduce cusp by 2mm on a flat base for more resistance

In class II restorations, all of the following are considered to occur as probable causes of periodontal problems except: A. Flat ridge B. Faulty or not proper contour C. Not properly polished restoration D. Cervical wall is too deeply apical E. Overextension of lining in cavity

Description : In class II restorations, all of the following are considered to occur as probable causes of periodontal problems except: A. Flat ridge B. Faulty or not proper contour C. Not properly polished restoration D. Cervical wall is too deeply apical E. Overextension of lining in cavity

Last Answer : E. Overextension of lining in cavity

When preparing a class III cavity for composite restoration; in which situation should acid itching be used: A. Always should be performed to minimise marginal leakage B. Should not be performed because it might damage the adjacent tooth C. When extra retention is required D. Only in situations where cavity is shallow to avoid pulp irritation

Description : When preparing a class III cavity for composite restoration; in which situation should acid itching be used: A. Always should be performed to minimise marginal leakage B. Should not be ... extra retention is required D. Only in situations where cavity is shallow to avoid pulp irritation

Last Answer : A. Always should be performed to minimise marginal leakage

In preparing a very small proximal amalgam cavity on a molar tooth what would consider, A. Extend the cavity to the gingival margin B. Extend the cavity beyond the contacts areas C. Achieve at least 2mm in dentine D. Extend cavity just beyond dento enamel junction

Description : In preparing a very small proximal amalgam cavity on a molar tooth what would consider, A. Extend the cavity to the gingival margin B. Extend the cavity beyond the contacts areas C. Achieve at least 2mm in dentine D. Extend cavity just beyond dento enamel junction

Last Answer : D. Extend cavity just beyond dento enamel junction

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

At what angle to the external surface should proximal cavosurface walls in Class II preparation for the reception of an amalgam filling be finished: A. Acute angle B. Right angle C. Obtuse angle D. 45 angle

Description : At what angle to the external surface should proximal cavosurface walls in Class II preparation for the reception of an amalgam filling be finished: A. Acute angle B. Right angle C. Obtuse angle D. 45 angle

Last Answer : C. Obtuse angle

The cervical finish line of a full veneer crown preparation should be placed: A. Just supragingival whenever is possible B. According to the depth of gingival crevice C. Subgingival to reduce ability of recurrent caries D. At the junction of tooth and amalgam core

Description : The cervical finish line of a full veneer crown preparation should be placed: A. Just supragingival whenever is possible B. According to the depth of gingival crevice C. Subgingival to reduce ability of recurrent caries D. At the junction of tooth and amalgam core

Last Answer : A. Just supragingival whenever is possible

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

All of the following should be considered for systemic antibiotic except: A. Extraction of tooth with acute dento alveolar abscess B. Necrotic ulcerative gingivitis (ANUG) unless it is acute. C. Extraction of 38 or 48 with acute pericoronitis D. Full mouth extraction for a patient with perio disease

Description : All of the following should be considered for systemic antibiotic except: A. Extraction of tooth with acute dento alveolar abscess B. Necrotic ulcerative gingivitis (ANUG) unless it is acute. C. ... of 38 or 48 with acute pericoronitis D. Full mouth extraction for a patient with perio disease

Last Answer : B. Necrotic ulcerative gingivitis (ANUG) unless it is acute.

What is INCORRECT in HIV associated periodontitis:** A. Picture of ANUG superimposed with RPP B. Spontaneous bleeding interproximal C. Depression of T4/T8 lymphocytes D. Deep Perio-pockets usually seen in advanced periodontitis

Description : What is INCORRECT in HIV associated periodontitis:** A. Picture of ANUG superimposed with RPP B. Spontaneous bleeding interproximal C. Depression of T4/T8 lymphocytes D. Deep Perio-pockets usually seen in advanced periodontitis

Last Answer : C. Depression of T4/T8 lymphocytes

What is the common appearance of vertical tooth fracture?* A. Perio abscess like appearance B. Displacement of fragments

Description : What is the common appearance of vertical tooth fracture?* A. Perio abscess like appearance B. Displacement of fragments

Last Answer : A. Perio abscess like appearance

In the preparation of Premolar class I cavity what is the best way of getting retention, A. Slightly done undercut of the mesial and distal walls B. Slightly done undercut of the buccal and lingual walls C. The convergence of the cavity walls

Description : In the preparation of Premolar class I cavity what is the best way of getting retention, A. Slightly done undercut of the mesial and distal walls B. Slightly done undercut of the buccal and lingual walls C. The convergence of the cavity walls

Last Answer : B. Slightly done undercut of the buccal and lingual wall

In cavity preparation 1mm below DEJ what is seen: A. More dentinal tubules, some intertubular and peritubular B. Some dentinal tubules, more intertubular and less peritubular C. More peritubular, some intertubular and dentinal tubular D. Equal amount of dentinal tubules, intertubular and peritubular

Description : In cavity preparation 1mm below DEJ what is seen: A. More dentinal tubules, some intertubular and peritubular B. Some dentinal tubules, more intertubular and less peritubular C. More ... , some intertubular and dentinal tubular D. Equal amount of dentinal tubules, intertubular and peritubular

Last Answer : B. Some dentinal tubules, more intertubular and less peritubular

To achieve optimum cavity preparation, which of the following factors of internal anatomy must be considered in root canal treatment: A. Outline form B. The age and shape of pulp chamber; in addition to the direction of individual root canals. C. Internal external relationship D. Intra-coronal preparation E. None of the above

Description : To achieve optimum cavity preparation, which of the following factors of internal anatomy must be considered in root canal treatment: A. Outline form B. The age and shape of pulp chamber; in ... root canals. C. Internal external relationship D. Intra-coronal preparation E. None of the above

Last Answer : B. The age and shape of pulp chamber; in addition to the direction of individual root canals.

Sensitivity to hot and cold foods soon after cavity preparation and placement of GIC and composite resin in an upper incisor tooth is due to: A. Mechanical trauma due to cavity preparation B. Chemical C. Heat from GIC settings

Description : Sensitivity to hot and cold foods soon after cavity preparation and placement of GIC and composite resin in an upper incisor tooth is due to: A. Mechanical trauma due to cavity preparation B. Chemical C. Heat from GIC settings

Last Answer : A. Mechanical trauma due to cavity preparation

the pulp horn most likely to be exposed in the preparation of large cavity in permanent molar tooth is,CHECK ITS VERY CONTROVERSIAL QUESTION A. Mesio–Lingual in upper first molars B. Mesio–Buccal in upper first molars C. Disto–buccal in lower first molars D. Mesio–Lingual in lower first molars E. Mesio- Buccal in lower first molar

Description : the pulp horn most likely to be exposed in the preparation of large cavity in permanent molar tooth is,CHECK ITS VERY CONTROVERSIAL QUESTION A. Mesio-Lingual in upper first molars B. Mesio-Buccal in ... first molars D. Mesio-Lingual in lower first molars E. Mesio- Buccal in lower first molar

Last Answer : B. Mesio–Buccal in upper first molars

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

A patient has improperly formed DEJ, reduction in size of pulp chamber, chipping and attrition of enamel that would MOSTLY be: A. Fluorosis B. Amelogenesis imperfecta C. Dentinogenesis imperfecta

Description : A patient has improperly formed DEJ, reduction in size of pulp chamber, chipping and attrition of enamel that would MOSTLY be: A. Fluorosis B. Amelogenesis imperfecta C. Dentinogenesis imperfecta

Last Answer : C. Dentinogenesis imperfecta

High content copper amalgam . . . a. generally requires greater energy to accomplish trituration b. should be placed rapidly in large increments c. Continues to leak since the corrosion products do not form d. does not cause galvanism in oral environment e. is equally effective as conventional alloys in clinical studies

Description : High content copper amalgam . . . a. generally requires greater energy to accomplish trituration b. should be placed rapidly in large increments c. Continues to leak since the ... not cause galvanism in oral environment e. is equally effective as conventional alloys in clinical studies

Last Answer : a. generally requires greater energy to accomplish trituration

Which of the following is true regarding preparation of custom tray for elastomeric impression: a. Adhesive is preferred over perforation. b. Perforation provides adequate retention c. Adhesive is applied immediately before procedure d. Perforations are not made in the area over the prepared tooth .

Description : Which of the following is true regarding preparation of custom tray for elastomeric impression: a. Adhesive is preferred over perforation. b. Perforation provides adequate retention c. Adhesive is ... before procedure d. Perforations are not made in the area over the prepared tooth .

Last Answer : a. Adhesive is preferred over perforation.

.Which of the following is true regarding preparation of custom tray for elastomeric impression: A. Adhesive is preferred over perforation B. Perforation provides adequate retention C. Adhesive is applied immediately before procedure D. Perforations are not made in the area over the prepared tooth

Description : .Which of the following is true regarding preparation of custom tray for elastomeric impression: A. Adhesive is preferred over perforation B. Perforation provides adequate retention C. Adhesive is ... immediately before procedure D. Perforations are not made in the area over the prepared tooth

Last Answer : A. Adhesive is preferred over perforation

Patient has hot and cold sensation and pain on percussion after the filling of class III Cavity with GIC base and composite. What will be possible cause – 1) bacterial microleakage 2) mechanical trauma of cavity cutting 3) Exothermic reaction while setting GIC

Description : Patient has hot and cold sensation and pain on percussion after the filling of class III Cavity with GIC base and composite. What will be possible cause – 1) bacterial microleakage 2) mechanical trauma of cavity cutting 3) Exothermic reaction while setting GIC

Last Answer : 2) mechanical trauma of cavity cutting

.Which of the following is true: A. Antibiotics are useful in the treatment of periodontitis B. Trauma from occlusion causes thickening of the marginal gingivae C. Periodontitis is the primary cause of teeth lost after the age of 35. D. All periodontal pockets can be identified by x-ray E. Periodontitis is the most common disease in the oral cavity

Description : .Which of the following is true:  A. Antibiotics are useful in the treatment of periodontitis   B. Trauma from occlusion causes thickening of the marginal gingivae  C. Periodontitis is the ... can be identified by x-ray  E. Periodontitis is the most common disease in the oral cavity

Last Answer : E. Periodontitis is the most common disease in the oral cavity

Two central incisors on a radiograph are showing with what looks like eye drop radiolucency. You decided to start endodontic treatment on these teeth but when you tried to open access to the root canal you find clearly closed orifices with what look like secondary dentine. What is your initial management? A. Leave as it and start a permanent restoration. B. Start systemic antibiotic C. Try to ream and file canals

Description : Two central incisors on a radiograph are showing with what looks like eye drop radiolucency. You decided to start endodontic treatment on these teeth but when you tried to open access to the root ... and start a permanent restoration. B. Start systemic antibiotic C. Try to ream and file canals

Last Answer : C. Try to ream and file canals

When incrementally placing a large composite resin restoration, what effect does an air-inhibited layer on the surface of the first increment have on the bond between the first and the second increments? A. It has no effect on the bond B. It is desirable and improves the bond C. It is undesirable and should be removed

Description : When incrementally placing a large composite resin restoration, what effect does an air-inhibited layer on the surface of the first increment have on the bond between the first and the second increments? A. ... B. It is desirable and improves the bond C. It is undesirable and should be removed

Last Answer : B. It is desirable and improves the bond

On examination of a composite restoration you find a dark attain: A. Replace the composite B. Repair with unfilled resin C. Apply topical fluoride at the margin

Description : On examination of a composite restoration you find a dark attain: A. Replace the composite B. Repair with unfilled resin C. Apply topical fluoride at the margin

Last Answer : A. Replace the composite

On an X ray you find the cement of the previous root canal treatment is extending 1mm beyond the apex without any symptoms; what would you do: A. Remove restoration material and retreat B. Apiectomy C. Leave as is until any complications occur

Description : On an X ray you find the cement of the previous root canal treatment is extending 1mm beyond the apex without any symptoms; what would you do: A. Remove restoration material and retreat B. Apiectomy C. Leave as is until any complications occur

Last Answer : C. Leave as is until any complications occur

On an X ray you find the Gutta Percha cone extending 1mm beyond the apex without any symptoms, what would you do: A. Remove restoration material until you are able to withdraw the Gutta Percha cone B. Apiectomy C. Leave as is until any complications occur

Description : On an X ray you find the Gutta Percha cone extending 1mm beyond the apex without any symptoms, what would you do: A. Remove restoration material until you are able to withdraw the Gutta Percha cone B. Apiectomy C. Leave as is until any complications occur

Last Answer : C. Leave as is until any complications occur

Which of the following may be caused by a newly placed restoration which interferes with the occlusion A. Apical abscess B. Pulpal necrosis C. Apical periodontitist

Description : Which of the following may be caused by a newly placed restoration which interferes with the occlusion A. Apical abscess B. Pulpal necrosis C. Apical periodontitist

Last Answer : C. Apical periodontitist

Reconstructing the occlusal anatomy is based on: A. Functional factors B. Depth of restoration on a tooth C. Necessity to restore normal anatomy

Description : Reconstructing the occlusal anatomy is based on: A. Functional factors B. Depth of restoration on a tooth C. Necessity to restore normal anatomy

Last Answer : A. Functional factors

An alternator will fail to produce line voltage as a result of _____________. A. a closed circuit breaker B. oxidized slip rings C. improperly staggered brushes D. exciter generator failure

Description : An alternator will fail to produce line voltage as a result of _____________. A. a closed circuit breaker B. oxidized slip rings C. improperly staggered brushes D. exciter generator failure

Last Answer : Answer: D

Characteristic of mucogingival involvement: a. A pocket of more than 4 mm depth. b. Only 1mm of attached gingiva remains. c. Pocket extends to the mucogingival junction.

Description : Characteristic of mucogingival involvement: a. A pocket of more than 4 mm depth. b. Only 1mm of attached gingiva remains. c. Pocket extends to the mucogingival junction.

Last Answer : c. Pocket extends to the mucogingival junction.

Characteristic of mucogingival involvement: A. A pocket of more than 4 mm depth B. Only 1mm of attached gingiva remains C. Pocket extends to the mucogingival junction

Description : Characteristic of mucogingival involvement: A. A pocket of more than 4 mm depth B. Only 1mm of attached gingiva remains C. Pocket extends to the mucogingival junction

Last Answer : C. Pocket extends to the mucogingival junction

What is the histopathology of the pathogenesis of the plaque following 21 days of plaque accumulation: A. Primarily infiltrate of plasma cells B. Primarily infiltrate of lymphocytes C. Infiltrate of plasma cells and early bone involvement D. Infiltrate of neutrophils

Description : What is the histopathology of the pathogenesis of the plaque following 21 days of plaque accumulation: A. Primarily infiltrate of plasma cells B. Primarily infiltrate of lymphocytes C. Infiltrate of plasma cells and early bone involvement D. Infiltrate of neutrophils

Last Answer : C. Infiltrate of plasma cells and early bone involvement

The characteristic feature of basal cell carcinoma is: A. Blood metastasis B. Does not erode bone C. Intensive involvement / inveterately characteristic/ D. Radio resistant

Description : The characteristic feature of basal cell carcinoma is:  A. Blood metastasis   B. Does not erode bone  C. Intensive involvement / inveterately characteristic/  D. Radio resistant 

Last Answer : C. Intensive involvement / inveterately characteristic/ 

Oral mucosal pigmentation; what is TRUE: a. Commonly depends on ethnicity. b. Commonly an amalgam tattoo. c. Commonly oral melanoma. d. Commonly melanotic naevus.

Description : Oral mucosal pigmentation; what is TRUE: a. Commonly depends on ethnicity. b. Commonly an amalgam tattoo. c. Commonly oral melanoma. d. Commonly melanotic naevus.

Last Answer : a. Commonly depends on ethnicity.