Dental Materials Final Review

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  • 1/66 Questions

    A restorative material that is placed on the facial surface of anterior teeth to "cover" or hide an esthetic problem is called a:

    • Coping
    • Veneer
    • Buildup (core)
    • Pontic
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About This Quiz

The 'Dental Materials Final Review' assesses knowledge in endodontics and dental materials, focusing on procedures like root canal therapy and orthodontic treatments. It covers key concepts such as obturation, composite types, apicoectomy, and the use of irrigants and retainers.

Dental Materials Final Review - Quiz

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  • 2. 

    The wax rims used for denture construction serve to determine the patient's:

    • Midline

    • Plane of occlusion

    • Size of denture teeth

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    The wax rims used for denture construction serve multiple purposes. They help determine the patient's midline, which is the imaginary line that divides the upper and lower jaws. They also help establish the plane of occlusion, which is the relationship between the upper and lower teeth when the jaws are closed. Additionally, the wax rims aid in determining the size and positioning of the denture teeth. Therefore, all of the given options are correct.

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  • 3. 

    To ensure longevity and function of the implant, the patient is responsible for:

    • Eventual payment in full of all implant procedures

    • Plaque control

    • Application of tray delivered fluoride

    • Proper occlusion

    Correct Answer
    A. Plaque control
    Explanation
    The patient must maintain excellent plaque control and practice frequent and effective oral hygiene to ensure longevity of the implant. The dentist would adjust and monitor the occlusion of the implant with the opposing teeth. Fluoride applications at home are not typical for maintenance of implants.

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  • 4. 

    The endodontic surgical procedure that removes 1-3 mm of the root apex is called a/an:

    • Endodontic treatment

    • Retrofill

    • Root resection

    • Apicoectomy

    Correct Answer
    A. Apicoectomy
    Explanation
    An apicoectomy surgically removes 1-3 mm of the root apex. A retrofill is preparing, filling, and sealing of the apical end of the root. A root resection, another surgical procedure, is the removal of an entire root of a multirooted tooth. Retreatment is root canal therapy performed a second time.

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  • 5. 

    The debonding procedure is done after orthodontic treatment is completed. The dental material removed from tooth surfaces is:

    • Composite resin

    • Cold cure resin

    • Dental cement

    • Ligature material

    Correct Answer
    A. Composite resin
    Explanation
    Brackets are secured to the tooth surface by acid etching and coposite resin. Dental cements may be used to secure bands to the tooth (molars). Chemically activated resins are used to make custom trays and denture fabrication and repairs. Ligatures secure the archwire into the bracket slot.

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  • 6. 

    Which of the following is considered to be a fixed indirect restoration?

    • Amalgam

    • Direct gold (gold foil)

    • Onlay

    • Composite

    Correct Answer
    A. Onlay
    Explanation
    Amalgam, gold foil, and composite restorations are direct restorations, which means that they are constructed directly in the oral cavity. It usually involves placing the restorative material "directly" into the cavity preparation. Other restorations, such as inlays, onlays, crowns, and bridges are constructed outside of the oral cavity, in a dental laboratory. hence, they are referred to as "indirect" restorations. The term "fixed" is used to designate that it is not removable because it is cemented, or luting, in place. A fixed restoration is not removable by the patient.

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  • 7. 

    Which of the following dental materials promotes the formation of secondary dentin?

    • Composite cements

    • Silicate cement

    • Calcium hydroxide

    • Temporary cements

    Correct Answer
    A. Calcium hydroxide
    Explanation
    Calcium hydroxide promotes the formation of secondary dentin. Secondary dentin is a protective layer of dentin that forms in response to dental trauma or irritation. Calcium hydroxide stimulates the pulp cells to produce secondary dentin, helping to repair and protect the tooth. Composite cements, silicate cement, and temporary cements do not have the same effect on promoting the formation of secondary dentin.

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  • 8. 

    The word "obturation" when used in discussion of root canal therapy means:

    • Accessing the canal

    • Filling and sealing the canal

    • Placing the final restoration

    • Removing the contents of the pulp

    Correct Answer
    A. Filling and sealing the canal
    Explanation
    Obturate refers to the filling and sealing of the root canal once the pulp tissue is removed. Accessing the canal means to create an opening through the tooth to the pulp chamber. This is done with a handpiece and bur.

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  • 9. 

    What is used to disinfect the canal system by killing bacteria and dissolving pulpal tissue?

    • Endodontic sealers

    • Paper points

    • Irrigants

    • Gutta-percha

    Correct Answer
    A. Irrigants
    Explanation
    irrigants are aqueous solutions used to disinfect the canal system. Common irrigants are sodium hypochlorite, saline, and chlorohexidine gluconate. Paper points are used to dry the root canal. Sealers are a type of cement used to coat the canal and to fill in voids between the canal wall and gutta-percha. Gutta-percha is a polymeric material with zinc oxide and barium sulfate added.

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  • 10. 

    Another name for a provisional restoration is a __________ restoration.

    • Conditional

    • Non-permanent

    • Buildup

    • Temporary

    Correct Answer
    A. Temporary
    Explanation
    A provisional crown is the appropriate, professional name (especially used by prosthodontists) for a temporary crown.

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  • 11. 

    A patient who has a very small, or essentially no mandibular ridge, is said to have a (an):

    • Atrophic dentulous mandible

    • Atrophic edentulous mandible

    • Iatrogenic edentulous mandible

    • Dysfunctional edentulous mandible

    Correct Answer
    A. Atrophic edentulous mandible
    Explanation
    An alveolar ridge having no teeth is said to be edentulous. In most cases, when the mandibular arch atrophies, it becomes smaller in size due to aging. An atrophic edentulous mandible is one that has no teeth, is very "low" and small, and would be adequate to support a denture. The word "iatrogenic" means "caused by a professional by accident" and the word "dentulous" means "with, or having teeth"

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  • 12. 

    Cements are _______ soluble than the overlying restoration.

    • More

    • Less

    • Equally

    • None of the above

    Correct Answer
    A. More
    Explanation
    Cements are more soluble than the overlying restoration. This means that cements have a higher tendency to dissolve or break down compared to the restoration material that is placed on top of it. This could be due to differences in composition or chemical properties between the two materials. As a result, cements may require more maintenance or replacement over time compared to the restoration material.

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  • 13. 

    Which of the following materials used in orthodontic treatment serves to secure the arch wire on the facial surfaces of a tooth?

    • Band

    • Bracket

    • Composite resin

    • Retainer

    Correct Answer
    A. Bracket
    Explanation
    Orthodontic brackets are bonded onto the facial surfaces and hold an arch wire in place on each tooth in the arch. The brackets transfer the forces of the wire, springs, and elastics to the teeth. Bands encircle the crown, and are used on molars because they require more force to move compared to other teeth. Retainers are used to prevent relapse after treatment. Composite resin is used to attach the bracket to the tooth surface.

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  • 14. 

    All of the following conditions are contraindications for implant placement except:

    • Recurrent caries

    • Poor oral hygiene

    • Diabetes

    • Smoking

    Correct Answer
    A. Recurrent caries
    Explanation
    Patients with systemic diseases, such as diabetes, are contraindicated for dental implants. Smokers and patients practicing poor oral hygiene are also poor candidates for implants. Recurrent caries are not associated with contraindications for dental implants.

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  • 15. 

    Cross-linking of acrylic resins will improve the mechanical properties. The most important or beneficial property it would improve would be:

    • Resilience

    • Toughness

    • Fatigue

    • Creep

    Correct Answer
    A. Toughness
    Explanation
    Cross-linking of acrylic resins refers to the process of chemically bonding the polymer chains together, creating a three-dimensional network. This cross-linking enhances the strength and durability of the resin, resulting in improved mechanical properties. In this case, the most important property that would be improved by cross-linking is toughness. Toughness refers to the ability of a material to absorb energy and deform without fracturing. By cross-linking the acrylic resins, the material becomes more resistant to cracking and breaking, making it tougher and more durable.

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  • 16. 

    Which orthodontic device prevents "relapse" of the teeth?

    • Archwire

    • Ligature

    • Bracket

    • Retainer

    Correct Answer
    A. Retainer
    Explanation
    A retainer is a fixed (bonded) or removable appliance to prevent relapse after active orthodontic treatement is completed. A bracket is a small metal, ceramic, or polymer material that has a centered, horizontal slot. the archwire fits into the slot of each bracket, usually across the entire arch. A ligature, either wire or elastic, secures the archwire into the bracket slot.

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  • 17. 

    Surgical silk surture is:

    • Another name for surgical gut suture

    • Absorbable and removed at a later appointment

    • Nonabsorbable and removed at a later appoinment

    • Absorbable and exists both inside and outside the body while in place

    Correct Answer
    A. Nonabsorbable and removed at a later appoinment
    Explanation
    surgical silk suture is nonabsorbable and must be removed at a later appointment. Absorbable sutures are usually placed on the inside of the body, and since the body resorbs them, a later appointment for removal is not necessary. Surgical gut suture is one type of absorbable suture.

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  • 18. 

    The type of implant that involves cutting a hole into the alveolar bone and then pressing or screwing in the implant is called:

    • Subperiosteal

    • Staple

    • Transosseous

    • Endosseous

    Correct Answer
    A. Endosseous
    Explanation
    endosseous or tooth form implants are screwed or pressed into a cut hole in the bone. Transosseous or staple implants include a plate and bolts that go through the mandible in the anterior region. Subperiosteal implants involve two surgeries, an impression, cast, and a metal framework.

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  • 19. 

    All of the following should be included in the post-care maintenance of a patient with an implant except one. Which one is the EXCEPTION?

    • Necessary chairside, home-care instruction

    • Recommended auxiliary aids

    • Selecting the restorative material for an adjustment restoration.

    • Specific length of time between recall visits

    Correct Answer
    A. Selecting the restorative material for an adjustment restoration.
    Explanation
    The scope of practice of the dental hygienist does not include selecting restorative materials for tooth restoration. However, a very important role of the hygienist is patient education, determining the time between dental hygiene visits, and selecting the best auxiliary aids for the patient to achieve optimal plaque removal.

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  • 20. 

    Polycarboxylate cement adheres to which of the following?

    • Dentin

    • Enamel

    • Metal

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    Polycarboxylate cement is a dental adhesive material that is known for its excellent adhesion properties. It is capable of adhering to various surfaces in the oral cavity, including dentin, enamel, and metal. This makes it a versatile option for dental restorations, as it can be used to bond restorative materials to different tooth structures and metal frameworks. Its ability to adhere to all of these surfaces makes it a preferred choice for dental professionals in various clinical situations.

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  • 21. 

    The term used to define the process of firing porcelain powder to become a solid is:

    • Liquidating

    • Sintering

    • Burning

    • Investing

    Correct Answer
    A. Sintering
    Explanation
    Changing a porcelain powder to a solid is called sintering. The powder is not melted, so the shape of the restoration is maintained. Burnishing involves pushing the metal toward the tooth to close gaps between the casting and the tooth. Investing is covering a wax pattern mounted in a casting ring with mixed gypsum product (investment)

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  • 22. 

    Porcelain is "best suited" for which of the following?

    • Full coverage posterior crowns

    • MODFL onlays

    • Veneers on anterior teeth

    • MOD inlays

    Correct Answer
    A. Veneers on anterior teeth
    Explanation
    Porcelain has outstanding esthetic properties, such as translucency and life-like appearance. It is very brittle, however, and may fracture when subjected to high occlusal forces. It is recommended for veneers and low-stress crowns for anterior teeth, such as maxillary lateral incisors.

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  • 23. 

    During the casting procedure, a wax pattern is heated, and the wax melts and flows out of the mold. As the temperature continues to rise, any residual wax is burned away. This heating procedure is called:

    • Shrinkage compensation

    • Investing

    • Burnout

    • Crucible heating

    Correct Answer
    A. Burnout
    Explanation
    Inlay wax is used for casting procedures. It leaves no residue in the burnout process and has a higher melting temperature. It is also harder than other dental waxes. Sticky wax is also a hard wax that melts at a higher temperature, but this wax is used as an "attachment medium" such as attaching a sprue to a pattern. Boxing wax is used to pour impressions, and baseplate wax is used in the fabrication of dentures.

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  • 24. 

    All of the following are true for ZOE EXCEPT:

    • It releases fluoride

    • It lacks strength

    • It is an obtundent material

    • It protects the pulp

    Correct Answer
    A. It releases fluoride
    Explanation
    ZOE (Zinc Oxide Eugenol) is a dental material commonly used for temporary fillings and cementing crowns. It is known for its obtundent properties, which means it helps to soothe and calm the dental pulp. Additionally, it provides a temporary protective barrier for the pulp. However, one property that does not apply to ZOE is that it releases fluoride. Unlike some other dental materials, ZOE does not have the ability to release fluoride ions, which are beneficial for preventing tooth decay.

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  • 25. 

    The patient's home care regimen of implant maintenance may consist only of a toothbrush and floss. Without proper maintenance, the possibility of implant failure greatly increases.

    • The first statement is true; the second statement is false.

    • The first statement is false; the second statement is true.

    • Both statements are true

    • Both statements are false

    Correct Answer
    A. Both statements are true
    Explanation
    The first statement is true because the patient's home care regimen for implant maintenance can indeed consist only of a toothbrush and floss. This is a common and effective method for maintaining oral hygiene around implants. The second statement is also true because without proper maintenance, the possibility of implant failure does increase. Regular and proper care, including brushing and flossing, is necessary to prevent complications and ensure the long-term success of dental implants.

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  • 26. 

    When glass ionomer is mixed too slowly, the resulting mix is:

    • Thin

    • Thick

    • Lumpy

    • Granular

    Correct Answer
    A. Thick
    Explanation
    When glass ionomer is mixed too slowly, the resulting mix becomes thick. This is because glass ionomer is a self-curing material, meaning it sets and hardens on its own without the need for additional curing agents or external factors. Mixing it slowly prevents the proper incorporation of the powder and liquid components, leading to a thicker consistency. A slow mixing process does not allow for the proper dispersion and hydration of the glass particles, resulting in a thicker and less workable mixture.

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  • 27. 

    The term used when the denture teeth are set in wax is:

    • Denture arrangement

    • Denture set up

    • Articulated set up

    • Articulated arrangement

    Correct Answer
    A. Denture set up
    Explanation
    "Denture set up" refers to the process of setting the denture teeth in wax. This involves arranging the artificial teeth in the desired position and alignment within the wax base of the denture. This step is crucial in creating a properly fitting and functional denture before it is finalized and fabricated.

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  • 28. 

    Mandibular dentures are easier to wear than maxillary. Saliva helps to improve the suction needed to hold a denture in place.

    • The first statement is true, the second statement is false.

    • The first statement is false, the second statement is true.

    • Both statements are true.

    • Both statements are false.

    Correct Answer
    A. The first statement is false, the second statement is true.
    Explanation
    A maxillary denture is much easier to wear than a mandibular denture because of the extension of the borders of the denture (which helps to create the seal) and larger surface bearing area. Saliva halps to achieve the seal and improve the suction.

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  • 29. 

    One type of an all-ceramic restoration is castable glass. All-ceramic restorations are superior to ceramometal restorations in all respects.

    • The first statement is true, the second statement is false.

    • The first statement is false, the second statement is true.

    • Both statements are true

    • Both statements are false

    Correct Answer
    A. The first statement is true, the second statement is false.
    Explanation
    It is true that castable glass is one type of all-ceramic restoration. All-ceramic restorations are not superior to ceramometal materials in the aspect of strength, however, and that makes the second statement false.

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  • 30. 

    All debonding methods remove some enamel. It is the responsibilit of the hygienist to select the least traumatic method of resin removal.

    • The first statement is true, the second statement is false.

    • The first statement is false, the second statement is true.

    • Both statements are true

    • Both statements are false.

    Correct Answer
    A. Both statements are true
    Explanation
    Both statements are true. The first statement states that all debonding methods remove some enamel, which is true as debonding involves removing the resin material from the enamel surface. The second statement states that it is the responsibility of the hygienist to select the least traumatic method of resin removal, which is also true as the hygienist is responsible for choosing the method that causes the least damage to the enamel during the debonding process.

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  • 31. 

    A pulpotomy usually serves as a _________ procedure on permanent molars.

    • Temporary

    • Permanent

    • Either temporary or permanent

    • Neither temporary or permanent

    Correct Answer
    A. Temporary
    Explanation
    For permanent molars, a pulpotomy is a temporary procedure and is followed by root canal therapy. For primary molars, it is a permanent procedure and is restored with a stainless-steel crown. This will maintain space and function until the permanent molar takes its place.

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  • 32. 

    If a mold that is created for investing and casting does not _________ to compensate for the action of the metal alloy, the casting will not fit.

    • Contract

    • Equate

    • Expand

    • None of the above

    Correct Answer
    A. Expand
    Explanation
    The gypsum investment material that comprises the mold must be expanded to compensate exactly for the shrinkage of the metal casting. Otherwise, the cast restoration will not fit the preparation of the patient's tooth.

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  • 33. 

    An advantage of bonding porcelain to metal is:

    • A precise fit of the metal

    • The resulting opacity

    • The resulting translucency

    • Ease in plaque removal

    Correct Answer
    A. A precise fit of the metal
    Explanation
    Bonding porcelain to metal in a ceramometal restoration provides a precise fit to the prepared tooth structure. The disadvantage is the opacity, because of the metal. There is no difference between all ceramic or ceramometal crown in the pateints ability to remove plaque.

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  • 34. 

    The direction of the stroke of the bur during debonding should be toward the:

    • Gingival margin

    • Proximal surface

    • Embrasure spaces

    • Incisal or occlusal

    Correct Answer
    A. Incisal or occlusal
    Explanation
    During debonding, the direction of the stroke of the bur should be towards the incisal or occlusal surface. This means that the bur should be moved in a direction away from the gingival margin, proximal surface, and embrasure spaces. Moving the bur in this direction ensures that the bond between the material and the tooth is broken effectively without causing any damage to the surrounding structures.

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  • 35. 

    During mixing, which of the following cements should use as much of the area on the slab as possible to reduce the exothermic reaction?

    • Polycarboxylate

    • Glass ionomer

    • ZOE

    • Zinc phosphate

    Correct Answer
    A. Zinc phosphate
    Explanation
    Zinc phosphate cement should be used as much as possible on the slab during mixing to reduce the exothermic reaction. This is because zinc phosphate cement has a high exothermic reaction, meaning it generates a significant amount of heat during the setting process. By using as much of the area on the slab as possible, the heat generated by the cement can be spread out and dissipated more effectively, reducing the risk of thermal damage to the surrounding tissues.

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  • 36. 

    The disadvantage, or drawback, of using polycarboxylate cement is:

    • Lack of strength

    • Ability to bond to tooth structure

    • Biocompatibility

    • Lack of sufficient clinical data for long term use

    Correct Answer
    A. Lack of strength
    Explanation
    The disadvantage of using polycarboxylate cement is its lack of strength. This means that the cement may not be able to withstand high forces or pressure, making it less durable compared to other dental materials. This weakness can potentially lead to premature failure or damage to the restoration, requiring additional repairs or replacements.

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  • 37. 

    Which type of composite gives the clinician an advantage when removing orthodontic resins during bonding?

    • Microfilled

    • Macrofilled

    • Hybrid

    • None of the above

    Correct Answer
    A. Macrofilled
    Explanation
    A macrofilled composite has the advantage in that when fixed appliances are removed at the end of treatment (debonding), it is much eassier to locate residual composite bonding material. Macrofilled composites are rough and turn gray when the composite material is abraded with a metal instrument.

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  • 38. 

    Most denture teeth used today are acrylic rather than porcelain. Porcelain teeth are softer than acrylic teeth and do not cause excessive wear on natural opposing teeth.

    • The first statement is true; the second statement is false.

    • The first statement is false; the second statement is true.

    • Both statements are true.

    • Both statements are false

    Correct Answer
    A. The first statement is true; the second statement is false.
    Explanation
    Today's denture teeth are usually acrylic rather than porcelain. Porcelain teeth are, however, harder than acrylic teeth and cause excessive wear to the natural opposing teeth.

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  • 39. 

    During the debonding procedure, which of the following should be done to avoid unnecessary use of the bur?

    • Change to a new bur after the resin is removed on two teeth.

    • Apply air frequently and examine the surface.

    • Polish with the pumice slurry after 5 seconds of bur use

    • Use a constant circular motion with the bur

    Correct Answer
    A. Apply air frequently and examine the surface.
    Explanation
    To avoid unnecessary use of the bur during the debonding procedure, it is recommended to apply air frequently and examine the surface. This helps in detecting any remaining resin or adhesive on the teeth, allowing for targeted and efficient use of the bur. By applying air, any residual material can be visualized and identified, reducing the need for excessive bur use. Regular examination of the surface ensures that only the necessary areas are treated, minimizing the risk of overuse of the bur.

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  • 40. 

    Which of the following takes place during the second endosseous implant surgery?

    • An impression is taken for crown fabrication

    • An abutment is attached to the body of the implant

    • A healing cap is attached to the body of the implant

    • The amount of osseointegration is measured

    Correct Answer
    A. A healing cap is attached to the body of the implant
    Explanation
    A healing cap is placed on the implant during the second surgery. It extends out of the mucosa into the oral cavity. Once this heals and epithelial tissues are formed, the healing cap is removed, and an abutment is placed. Impressions may be necessary before treatment is completed, but they are not taken during the second surgery. Osseointegration is not measured during either surgery.

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  • 41. 

    The most obvious purpose of the investment is to:

    • Enlarge the mold by hygroscopic expansion

    • Enlarge the mold by thermal expansion

    • Form the mold for the casting

    • Provide compensation for contraction

    Correct Answer
    A. Form the mold for the casting
    Explanation
    The mold (investment) must expand and provide compensation for the metal contraction during casting. The main, obvious purpose of the investment, however, is to create a mold from the wax pattern in the casting process.

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  • 42. 

    The acrylic resin of a partial denture is processed the same way as complete denture EXCEPT:

    • It takes less time because fewer teeth are involved.

    • The finishing and polishing technique is much different

    • The acrylic resin must flow through and around the mesh of the framework.

    • It takes longer because of the design of the framework.

    Correct Answer
    A. The acrylic resin must flow through and around the mesh of the framework.
    Explanation
    The correct answer is that the acrylic resin must flow through and around the mesh of the framework. This is different from the processing of a complete denture because in a partial denture, the acrylic resin needs to flow around and attach to the metal framework that supports the artificial teeth. This ensures proper fit and stability of the partial denture. In contrast, a complete denture does not have a framework, so the processing technique does not involve the resin flowing through and around a mesh structure.

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  • 43. 

    It is important to remove all composite resin material during debonding to avoid all of the following EXCEPT one. Which one is the EXCEPTION?

    • Changes in occlusion

    • Gingival inflammation

    • Stain

    • Plaque accumulation

    Correct Answer
    A. Changes in occlusion
    Explanation
    During debonding, it is important to remove all composite resin material to avoid complications such as gingival inflammation, stain, and plaque accumulation. However, changes in occlusion are not directly related to the presence or absence of composite resin material, but rather to the overall alignment and positioning of the teeth. Therefore, changes in occlusion would not be an exception in this case.

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  • 44. 

    This type of implant is placed on the mandibular bone below the periosteum and involve two surgical procedures.

    • Endosseous

    • Transosseous

    • Subperiosteal

    • Staple

    Correct Answer
    A. Subperiosteal
    Explanation
    A subperiosteal implant is placed on the mandibular bone below the periosteum, which is the outer layer of the bone. This type of implant involves two surgical procedures, suggesting that it is a more complex and involved process compared to the other options. Endosseous implants are placed directly into the bone, transosseous implants go through the bone, and staples are not typically used for dental implants. Therefore, the correct answer is subperiosteal.

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  • 45. 

    To repair a broken denture, a thin layer is ground off. Next, a monomer is applied to the surfaces so that:

    • Some of the set material is dissolved

    • The setting reaction of the repair is accelerated

    • The finishing and polishing of the repair is made easier

    • The color of resin powder does not change

    Correct Answer
    A. Some of the set material is dissolved
    Explanation
    When repairing a broken denture, a thin layer is ground off to create a smooth surface for the repair. Applying a monomer to the surfaces helps in dissolving some of the set material. This is beneficial because it allows the repair material to bond effectively with the existing denture, ensuring a strong and durable repair. Additionally, dissolving some of the set material helps in accelerating the setting reaction of the repair, reducing the overall repair time. It also makes the finishing and polishing of the repair easier, resulting in a seamless and aesthetically pleasing outcome. Lastly, by dissolving some of the set material, the color of the resin powder used for the repair remains unchanged, maintaining a consistent appearance.

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  • 46. 

    The most commonly used technique to fill a root canal with gutta-percha is termed:

    • Direct compression

    • Lateral compression

    • Direct condensation

    • Lateral condensation

    Correct Answer
    A. Lateral condensation
    Explanation
    Lateral condensation is used to fill the root canal with gutta-percha. Condensation is a term used in dentistry to describe the method of compressing and filling a small area in a tooth, such as a preparation or root canal. Of all the answers, this one is most appropriate.

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  • 47. 

    Which of the following should be used to correctly debond?

    • Tapered plain-cut finishing bur and a high speed hand piece

    • Tapered plain-cut finishing bur and a low speed hand piece

    • Tapered cross-cut finishing but and a low speed hand piece

    • Straight fissure, plain-cut bur, and a high speed handpiece

    Correct Answer
    A. Tapered plain-cut finishing bur and a low speed hand piece
    Explanation
    A tapered plain-cut finishing bur is used to remove excess material and smooth the surface of a restoration. Using a low speed hand piece allows for more control and precision during the debonding process. The low speed hand piece reduces the risk of damaging the restoration or surrounding teeth. Using a high speed hand piece may generate excessive heat and vibration, which can lead to fractures or damage to the restoration. Therefore, the correct combination for debonding is a tapered plain-cut finishing bur and a low speed hand piece.

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  • 48. 

    Silver is classified as a ___________ metal.

    • Non-precious

    • High-noble

    • Precious

    • Noble

    Correct Answer
    A. Precious
    Explanation
    precious metals include the noble metals and silver. The noble metals are gold, platinum, and palladium. Non-precious metals are those that do not contain any noble elements. High-noble metals contain 60% or more gold and other noble elements.

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  • 49. 

    Two dental cements that are used for caries control are:

    • ZOE and zinc phosphate

    • ZOE and polycarboxylate

    • Zinc phosphate and glass ionomer

    • Glass ionomer and polycarboxylate

    • Glass ionomer and ZOE

    Correct Answer
    A. Glass ionomer and ZOE
    Explanation
    Glass ionomer and ZOE (Zinc Oxide Eugenol) are dental cements that are commonly used for caries control. Glass ionomer cements are tooth-colored and have good adhesion to both enamel and dentin. They release fluoride ions, which help in remineralizing the tooth structure and preventing further decay. ZOE cement contains zinc oxide and eugenol, which have antibacterial properties and can provide temporary relief from tooth sensitivity. Using a combination of glass ionomer and ZOE cement can provide both long-term caries control and temporary relief from symptoms.

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Quiz Review Timeline (Updated): Jul 19, 2023 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Jul 19, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Nov 21, 2015
    Quiz Created by
    Kellym10152011

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