Test 4- DHG 244 homework answer questions

The surgical procedure for placing implants must not injure the bone. Overheating the bone prevents osseointegration of the implant. Recommended temperatures are not to exceed _______ oF.

117

With two-stage implant placement, which of the following takes place during the second endosseous implant surgery?

A healing cap is attached to the body of the implant

This is the term for either a tooth or an implant which supports a fixed bridge.

Abutment

Identify the correct sequence in the casting process:

Add the sprue to the wax pattern, invest in gypsum stone, burnout, casting, and polishing

Performing this procedure is the standard of care before beginning root canal therapy.

All of the above

The term "nonvital" may be used to describe a tooth that has:

All of the above

Porcelain used in dentistry has the esthetic value of translucency. The definition of translucency is:

Allows light to pass through but does not allow objects to be seen clearly through it.

These procedures are considered irreversible dental procedures.

Both A and B full coverage crown and indirect veneers

A metal is called a noble metal based on cost. A metal is called a precious metal based on chemistry.

Both statements are false.

Each single unit of a fixed bridge is considered a unit. A bridge replacing #30, spanning from #29 to #31 would be termed a 3-unit bridge.

Both statements are true

A three-unit bridge requires that two abutment teeth are prepared for crowns. One advantage of an implant could be that it would save unrestored (those without fillings) teeth from crown preparations.

Both statements are true.

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

Burnout

This is a direct restoration which can be placed in a badly broken down tooth to provide a larger area of retention for a permanent crown.

Core build up

What is the purpose of a provisional restoration?

Decrease tooth sensitivity while the permanent indirect restoration is being fabricated Holds the prepared tooth in place while the permanent restoration is being fabricated. Holds the adjacent teeth in place while the permanent restoration is being fabricated.

Pure gold is very hard and an excellent choice for indirect restorations.

False

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

Filling and sealing the canal

What feature of a patient could be a contraindication to his or her receiving a fixed indirect restoration?

Having poor oral hygiene

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

Irrigants

Which of the following statements is NOT true regarding tooth sensitivity from vital tooth whitening?

It is not reversible

How does the dentist convey to the laboratory technician what type of crown is to be made?

Laboratory prescription

There are many factors that are taken into account when considering the design of an indirect restoration. What is the EXCEPTION?

NONE OF THE ABOVE

Which of the following variables is not a factor in the success of a vital tooth whitening treatment?

Number of teeth to be treated

This is the term for an artificial tooth in a bridge that replaces a missing natural tooth.

Pontic

This is the type of indirect restoration is fabricated with a metal-alloy interior and a porcelain exterior. This allows a crown to have the strength of metal with the esthetics of porcelain.

Porcelain fused to metal (PFM) single unit crown

What is placed on the prepared tooth while the laboratory is fabricating a permanent indirect restoration?

Provisional

All of the following are contraindications to implant placement EXCEPT:

Recurrent caries

Teeth with a moderate degree of _____________ are the most difficult to successfully whiten.

Tetracycline stain

When using an optical scanner for the final impression of a crown preparation, the parameters of the tooth preparation are different than when preparing a tooth when using an elastomeric impression material. The optical scanner image can be directly emailed to the laboratory with an emailed laboratory prescription.

The first statement is false; the second statement is true

Which of the following esthetic tooth treatments requires no removal of tooth structure?

Vital tooth whitening

Which of the following cements is the most soluble?

ZOE

This material has a high risk of fracture and will cause wear when it occludes against enamel, however indirect restorations made from this material have good marginal integrity when cemented with an adhesive cement and the highest level of esthetics.

ceramic

This material has a moderate risk of fracture and will cause wear when it occludes against enamel, however indirect restorations made from this material have very accurate marginal integrity and a high level of esthetics.

ceramometal

Fixed prosthodontics (or fixed restorative) is commonly referred to as:

crown and bridge

The laboratory technician prepares an exact replica of the prepared tooth to make a crown. What is the replica cast called?

die

An advantage of a computer assisted (CAD/CAM) restoration is:

fewer appointments, no impressions, better infection control

This is the type of impression which is sent to the dental laboratory for the preparation of a crown:

final

All of the following are true of ZOE materials EXCEPT:

fluoride release

This is a cast indirect restoration which covers the entire anatomic portion of a single tooth:

full crown

Select the cement(s) which has glass powder as a primary component:

glass ionomer

This cement is available in a single-dose capsule and is mixed in the amalgamator.

glass ionomer

Two cements that are used for caries control are:

glass ionomer and ZOE

The prosthodontic phase of implant treatment involves the placement of severl "parts" or attachments. A patient who has completed surgeries and restorative care would receive (in correct order):

implant, healing cap, abutment, crown

This is an indirect restoration which could be designed to restore a conservative Class II preparation, serving as an alternative to a direct restoration:

inlay

Indirect restorations fabricated from metal are:

made by a casting procedure, tough and work well in high, stress situations, considered not to be esthetic

This material has a low risk of fracture, does not wear against enamel, and has high marginal integrity when used as an indirect restorative material.

metal

This is an indirect restoration designed to cover occlusal, one or more cusps, and proximal surfaces of a posterior tooth:

onlay

Select the cement(s) which has polyacrylic acid as a primary liquid component:

polycarboxylate and zinc-oxide eugenol (ZOE)

This procedure is often a temporay emergency procedure done on permanent teeth. During this procedure pulp tissue from the pulp chamber and pulp canals is removed.

pulpectomy

This procedure is a permanent procedure done on primary teeth. During this procedure only the coronal pulp tissue is removed.

pulpotomy

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

sintering

This is an indirect restoration made of a thin layer of procelain which is bonded or cemented to the prepared facial surface of a tooth:

veneer

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

zinc phosphate

Select the cement(s) which has phosphoric acid as a primary liquid component:

zinc phosphate

Select the cement(s) which has zinc oxide powder as a primary component:

zinc phosphate and polycarboxylate

Select the cement(s) which has eugenol as a primary liquid component:

zinc-oxide eugenol (ZOE)