5 Restorative Dentistry and Dental Materials

5  Restorative Dentistry and Dental Materials

Multiple choice questions

1. A patient has had a full gold crown fitted on the lower left second molar tooth, but experiences discomfort in the tooth when closing the mouth fully. Which one of the following items is required to solve the problem?

(a) Articulating paper
(b) Ball-ended burnisher
(c) Friction grip diamond fissure bur
(d) Latch grip stainless steel rosehead bur
(e) Ward’s carver
2. The dentist is carrying out root canal therapy on the lower left first molar tooth. The root canals have been accessed and their contents are ready to be extirpated. Which one of the following instruments are you most likely to pass to the dentist?

(a) Barbed broach
(b) Finger spreader
(c) Gates Glidden drill
(d) Hand file
(e) Rotary paste filler
3. A patient attends the surgery for a routine dental examination, and the dentist notices several abrasion cavities. Which one of the following is the most likely Black’s classification of these lesions?

(a) Class I
(b) Class II
(c) Class III
(d) Class IV
(e) Class V
4. Glass ionomer cements are a versatile and widely used dental material and have been available for many years. Which one of the following is the main advantage of this material over composites?

(a) Adhesive to enamel
(b) Easily polished
(c) Greater strength
(d) Releases fluoride
(e) Superior aesthetics
5. When permanent teeth in children are traumatised, death of the pulp is not an inevitable consequence and a pulpotomy procedure can be carried out. Which one of the following is the most likely reason for using calcium hydroxide in this procedure?

(a) Fill the root canal
(b) Maintain pulp vitality in chamber
(c) Seal the apex
(d) Seal the root canal
(e) Sterilise the root canal
6. One of the best tooth-coloured restorative materials available to dentists for the restoration of teeth is composite. The material is available in a large range of shades, but they all contain which one of the following constituents?

(a) Calcium hydroxide
(b) Inorganic filler
(c) Polyacrylate and quartz
(d) Resin, silver and polyacrylate
(e) Silver and quartz
7. When fixed restorations are to be constructed, the tooth is first prepared and an impression is taken. Which one of the following impression materials is least likely to be used for this procedure?

(a) Addition silicone
(b) Alginate
(c) Condensation silicone
(d) Polyether
(e) Polyvinyl siloxane
8. At the fit stage of denture construction, the patient will attend for final insertion of the completed dentures and be given advice on their care and wear. Which one of the following instruments is required at this stage?

(a) Articulator
(b) Carborundum stone
(c) Gas burner
(d) Mixing spatula
(e) Plaster knife
9. The dentist is carrying out root canal therapy on the upper left second premolar tooth. All the caries has been removed and the dentist now needs to gain access to the root canal. Which one of the following instruments are you most likely to pass to the dentist?

(a) Barbed broach
(b) Finger spreader
(c) Gates Glidden drill
(d) Hand file
(e) Rotary paste filler
10. A patient attends for the restoration of a Class II cavity in a lower molar tooth. Following caries removal and lining of the cavity, the dentist is most likely to require which one of the following items?

(a) Articulating paper
(b) Floss
(c) Gingival retraction cord
(d) Matrix outfit
(e) Wooden wedge
11. A slow-speed handpiece is used for several procedures in dentistry, including the fine removal of caries in deep cavities. Which of the following indicates the speed at which this handpiece operates?

(a) 20 000 rpm
(b) 30 000 rpm
(c) 40 000 rpm
(d) 50 000 rpm
(e) 60 000 rpm
12. Zinc oxide and eugenol cement is a versatile and widely used material in dentistry, with various different uses. Which one of the following situations is one where this material would not be used?

(a) Impression paste
(b) Lining under composite
(c) Periodontal dressing
(d) Root filling paste
(e) Sedative dressing
13. Various dental impression materials are available for use during the construction of partial acrylic dentures. Which one of the following materials cannot be used for this purpose?

(a) Addition silicone
(b) Alginate
(c) Condensation silicone
(d) Impression paste
(e) Polyether
14. A patient attends for an amalgam restoration of the lower left second premolar tooth. The dentist removes the caries from the cavity and informs you that there is a pinpoint pulp exposure. Which one of the following materials are you most likely to be asked to prepare?

(a) Calcium hydroxide
(b) Glass ionomer cement
(c) Polycarboxylate cement
(d) Zinc oxide and eugenol cement
(e) Zinc phosphate cement
15. The dentist is completing root canal therapy on the lower right lateral incisor tooth. You have mixed a suitable root filling material. Which one of the following instruments are you most likely to pass to the dentist so that the material can be inserted into the canal?

(a) Barbed broach
(b) Finger spreader
(c) Gates Glidden drill
(d) Hand file
(e) Rotary paste filler
16. When using composite material to restore a cavity, an etching technique is used to chemically roughen the enamel surface and allow a good bond to form between the filling and the tooth. Which one of the following materials is used during this procedure?

(a) Hydrochloric acid
(b) Hydrogen peroxide
(c) Phosphoric acid
(d) Polyacrylic acid
(e) Sodium hypochlorite
17. A 5-year-old child presents for a routine dental check-up. On intra-oral examination the dentist suspects an interproximal cavity between the lower left deciduous molars. Which one of the following is the most suitable instrument to confirm this diagnosis?

(a) BPE probe
(b) Briault probe
(c) Sickle probe
(d) Straight probe
(e) Williams’ periodontal probe
18. After caries has been removed from a cavity and it has been correctly shaped to receive the restoration, the dentist often places a lining material over the floor of the cavity. Which one of the following describes the additional advantage that calcium hydroxide used in this way has over other linings?

(a) Chemically calms the pulp
(b) Promotes the formation of secondary dentine
(c) Protects the pulp from chemical irritation
(d) Protects the pulp from thermal irritation
(e) Seals the pulp from residual bacteria
19. Zinc phosphate cement has various uses in dentistry, and is produced by the careful mixing of zinc oxide powder with liquid phosphoric acid. Which one of the following is most likely to cause the material to set slowly?

(a) Excess powder
(b) Inadequate powder
(c) Moisture
(d) Thin glass slab
(e) Warm glass slab
20. Amalgam is a commonly used dental material for the restoration of cavities, in posterior teeth particularly. What is the main constituent of the alloy powder?

(a) Copper
(b) Mercury
(c) Silver
(d) Tin
(e) Zinc
21. When a tooth has been traumatised or attacked by cariogenic bacteria, it often results in the condition of irreversible pulpitis if left untreated. Which one of the following treatments is appropriate to save the tooth when this condition occurs?

(a) Apicectomy
(b) Open apex root filling
(c) Pulp capping
(d) Pulpectomy
(e) Pulpotomy
22. The majority of composite materials in use nowadays require exposure to a curing light to set fully. Which one of the following indicates the depth of material that the curing light can penetrate?

(a) 0.5 mm
(b) 1.0 mm
(c) 1.5 mm
(d) 2.0 mm
(e) 2.5 mm
23. When placing a plastic restoration, the dentist often uses a matrix system to prevent the creation of an overhang on the resultant filling. Which one of the following is most likely to require a Siqveland matrix outfit?

(a) Class I
(b) Class II
(c) Class III
(d) Class IV
(e) Class V
24. A patient returns to the surgery following placement of a restoration in the upper right first premolar. He is complaining of thermal sensitivity in the tooth, and the dentist decides to remove the restoration and place a temporary dressing. Which one of the following materials are you most likely to be asked to prepare?

(a) Calcium hydroxide
(b) Glass ionomer cement
(c) Polycarboxylate cement
(d) Zinc oxide and eugenol cement
(e) Zinc phosphate cement
25. During the restoration of a particularly deep cavity in the upper left first premolar tooth, the dentist must carefully remove the caries overlying the pulp chamber, without causing an exposure. Which one of the following instruments is used to achieve this?

(a) Ball-ended burnisher
(b) Enamel chisel
(c) Flat plastic instrument
(d) Friction grip diamond fissure bur
(e) Spoon excavator
26. During restorative procedures, it is very important to maintain good moisture control. This can be achieved successfully using a variety of methods. Which one of the following methods is least likely to be used during caries removal in a tooth cavity?

(a) 3 : 1 syringe
(b) Cottonwool roll
(c) Disposable saliva ejector
(d) High-speed aspirator
(e) Rubber dam
27. An air turbine handpiece is used for many procedures in dentistry. It uses friction grip diamond or tungsten carbide burs to quickly remove tooth tissue during preparation procedures. What speed does the air turbine operate at?

(a) 200 000 rpm
(b) 300 000 rpm
(c) 400 000 rpm
(d) 500 000 rpm
(e) 600 000 rpm
28. During root canal therapy, the dentist will use various specialised endodontic instruments to carry out each stage of the treatment. Which one of the following instruments is used to remove contaminated dentine from the root canal?

(a) Barbed broach
(b) Finger spreader
(c) Gates Glidden drill
(d) Hand file
(e) Hand reamer
29. Several materials are available to the dentist for use as temporary or permanent restorations. Other materials can be used as luting cements. Which one of the following cannot be used as a luting cement?

(a) Composite
(b) Glass ionomer
(c) Polycarboxylate
(d) Zinc oxide and eugenol
(e) Zinc phosphate
30. A patient attends the surgery for the preparation of the lower right first molar tooth for a full gold crown. Once the tooth has been anaesthetised, which one of the following burs is the dentist most likely to use for tooth preparation?

(a) Friction grip fissure bur
(b) Friction grip inverted cone bur
(c) Friction grip tapered bur
(d) Latch grip pear-shaped bur
(e) Latch grip rosehead bur
31. The majority of amalgam preparations for filling cavities are presented as preloaded capsules, which are mixed in an amalgamator. Which one of the following actions results in contraction of the mixed amalgam, allowing caries to recur?

(a) Excessive amalgamation
(b) Inadequate amalgamation
(c) Inadequate mixing time
(d) Prolonged mixing time
(e) Saliva contamination
32. Adequate retention of a full upper acrylic denture in a patient’s mouth depends on the presence of a saliva film between the denture and the palate. Which one of the following structures on the denture allows the film to develop here?

(a) Clasp
(b) Connector
(c) Flange
(d) Lingual bar
(e) Post dam
33. Several restorative materials are commonly used to restore teeth, some of which are tooth coloured to give improved aesthetics. Which one of the following materials has cariostatic properties?

(a) Amalgam
(b) Composite
(c) Glass ionomer
(d) Gold
(e) Porcelain
34. A patient returns to the surgery complaining of a rough edge to a recently provided composite restoration in the upper left central incisor. Once the dentist has located the rough margin, which one of the following instruments will be required?

(a) Ball-ended burnisher
(b) Friction grip pear-shaped finishing bur
(c) Latch grip stainless steel rosehead bur
(d) Miller’s forceps
(e) Ward’s carver
35. During root canal therapy, the dentist will use various specialised endodontic instruments to carry out each stage of the treatment. Which one of the following instruments is used to condense the filling material into the canal?

(a) Barbed broach
(b) Finger spreader
(c) Gates Glidden drill
(d) Hand file
(e) Hand reamer
36. Zinc phosphate cement has various uses in dentistry, and is produced by mixing zinc oxide powder with liquid phosphoric acid. Which one of the following situations is one where this material would not be used?

(a) Blocking an undercut
(b) Cementing a bridge
(c) Cementing an orthodontic band
(d) Lining a deep cavity
(e) Temporary filling
37. Glass ionomer cement is a widely used material in dentistry. Which one of the following situations is one where this material would not be used?

(a) Cementing a crown
(b) Class II restoration
(c) Class V restoration
(d) Fissure sealant
(e) Lining a cavity
38. A patient attends for restoration of an upper right second molar tooth. Following caries removal, lining placement and insertion of the filling material, which one of the following instruments is used to fully adapt the material to the cavity?

(a) Amalgam carrier
(b) Amalgam plugger
(c) Ball-ended burnisher
(d) Briault probe
(e) Ward’s carver
39. Calcium hydroxide cement is a widely used dental material. It can be presented as a chemical setting paste system or as a single paste light cure preparation. Which one of the following situations is one where this material would not be used?

(a) Lining a deep cavity
(b) Luting cement
(c) Open apex endodontics
(d) Pulp capping
(e) Pulpotomy
40. Once the root canal has been cleaned of all contaminated contents during root canal therapy, it is often temporarily filled with an antiseptic dressing. Which one of the following materials is included in this dressing?

(a) Calcium hydroxide
(b) Glass ionomer
(c) Zinc eugenol
(d) Zinc phosphate
(e) Zinc polycarboxylate
41. Several dental materials used for restoration are adhesive to enamel or dentine, but others are not. Which one of the following materials requires the presence of undercuts for it to remain in place?

(a) Amalgam
(b) Composite
(c) Glass ionomer
(d) Gold
(e) Porcelain
42. An inlay is a restoration produced in the laboratory to restore a cavity in a tooth, unlike a filling which is produced at the chair side. Which one of the following indicates the difference between the preparation of a tooth for filling and the preparation of a tooth for an inlay?

(a) Use of anaesthetic
(b) Use of dentinal pins
(c) Use of dovetail shape
(d) Use of lining
(e) Use of undercuts
43. Amalgam is possibly the most widely used permanent filling material for posterior teeth. Its alloy constituents can be varied to produce a mix that is less likely to discolour with time in saliva. Higher levels of which one of the following materials are most likely to produce resistance to discoloration?

(a) Copper
(b) Mercury
(c) Silver
(d) Tin
(e) Zinc
44. Glass ionomer cements have many applications, including the addition of metal powder to enable their use as a core build-up material. Which one of the following is the dental term for these enhanced products?

(a) Cermets
(b) Compomers
(c) Composites
(d) Compoules
(e) Conditioners
45. When permanent teeth in children are traumatised, it often occurs before closure of the apical foramen and an open apex root filling should be performed. Which one of the following is the most likely reason for using calcium hydroxide in this procedure?

(a) Fill the root canal
(b) Maintain pulp vitality in chamber
(c) Seal the apex
(d) Seal the root canal
(e) Sterilise the root canal
46. A patient attends for a Class II restoration in the upper right second molar tooth. Following caries removal and lining of the cavity, which one of the following instruments is used to place the filling material?

(a) Amalgam carrier
(b) Amalgam plugger
(c) Ball-ended burnisher
(d) Briault probe
(e) Ward’s carver
47. Before taking an impression of a tooth which has been prepared for a crown, the dentist ensures that the preparation margins are clearly visible. Which one of the following instruments is used for this purpose?

(a) Crown form
(b) Dam clamp
(c) Matrix band
(d) Retraction cord
(e) Wooden wedge
48. After caries has been removed from a cavity and it has been correctly shaped to receive the restoration, the dentist often places a lining material over the floor of the cavity. Which one of the following descri/>

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Jan 8, 2015 | Posted by in Dental Nursing and Assisting | Comments Off on 5 Restorative Dentistry and Dental Materials
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