DAT 113 (Ch 10,12,13,16,17) ULTIMATE REVIEW 🔥🔥🔥

(CH 10) Feldspathic porcelain restorations have:

Great stain resistance

(CH 10) Porcelain bonds to metal by which one of the following mechanisms?

Fusion with oxides on the surface of the metal

(CH 10) What is the main advantage of all-ceramic crowns over porcelain-bonded-to-metal crowns?

Their superior esthetics

(CH 10) What is the main drawback of feldspathic porcelain for all-porcelain crowns?

Their tendency to fracture

(CH 10) An in-office CAD/CAM system for ceramic restorations provides all of the following advantages except one. Which one? (A) The Restoration does not have to be fabricated in an outside laboratory. (B) A provisional crown is not needed (C) The procedure can be completed in one visit (D) Local anesthesia is not needed

Local anesthesia is not needed

(CH 10) What is the basic color of the tooth called?

Hue

(CH 10) All of the following should be avoided when taking the shade of a tooth except one. Which one? (A) Lipstick on the patient (B) Brightly colored clothing (C) Dirty teeth (covered with plaque) (D) Neutral wall colors in the room

Neutral wall colors in the room

(CH 10) All of the following materials should be avoided around ceramic restorations except one. Which one? (A) Acidulated topical fluoride products (B) Alginate impression material (C) Coarse prophy paste (D) Acid etchant

Alginate impression material

(CH 10) The impression for a CAD/CAM crown typically is:

Done by capturing an image of the prepared tooth with an optical scanner

(CH 10) When preparing a porcelain-fused-to-metal crown, the technician applies feldspathic porcelain in layers to the metal coping. What is the initial layer?

Opaque porcelain to hide the oxidized metal

(CH 10) On occasion, special porcelain stains are used on the surface of the porcelain. These stains contain metal oxides and are used to:

Mimic white spots or fine crack lines to resemble adjacent teeth

(CH 10) Which of the following statements about porcelain veneers is false? (A) Porcelain veneers are more durable than composite veneers (B) Porcelain veneers are usually cemented with zinc phosphate or glass ionomer cement (C) It is difficult to mask a darkly colored tooth with a porcelain veneer (D) Porcelain veneers must be handled carefully when one is trying them on because they are very fragile until bonded to the tooth

Porcelain veneers are usually cemented with zinc phosphate or glass ionomer cement.

(CH 10) When assisting the dentist with taking the shade of a tooth, the dental assistant should:

Cover brightly colored clothing with a pastel, neutral-colored bib

(CH 10) Which one of the following ceramic materials is the strongest and most fracture resistant?

Zirconia

(CH 10) Which one of the following ceramic materials is the most opaque and, therefore, the least esthetic?

Zirconia

(CH 10) For anterior ceramic restorations, the ceramic material used at the incisal edge tends to be which one of the following?

Translucent

(CH 10) The lightness or darkness of a color is referred to as which one of the following?

Value

(CH 10) Which of the following ceramic materials is not etched by hydrofluoric acid in preparation for cementation but may be sandblasted internally instead?

Zirconia

(CH 10) Porcelain veneers are bonded to the tooth with resin cement. This provides the opportunity to do all of the following except one. Which one? (A) Increase the strength of the restoration (B) Increase the retention of the restoration (C) Slightly modify the shade of the cemented restoration with a colored resin cement (D) Whiten the tooth with the acid etchant

Whiten the tooth with the acid etchant

(CH 10) All of the following considerations should be applied when finishing or polishing a ceramic material except one. Which one? (A) Use a slow speed (B) Use a coarse diamond bur for adjustments (C) Use light pressure (D) Progress from medium abrasives to finer ones

Use a coarse diamond bur for adjustments

(CH 10) All of the following are processing methods for ceramic materials, except one. Which one? (A) Sintering (B) Heat pressing (C) Cold curing (D) CAD/CAM

Cold curing

(CH 10) When taking photographs of the teeth to send to the dental laboratory to help convey the correct shade, which is the proper location for the shade tab in the photograph?

In the same planes as the tooth being matched

(CH 12) The ADA recognizes which three major categories of alloys?

High noble, noble, and base metal

(CH 12) High-noble metal classification must contain what percent by weight of gold?

40%

(CH 12) Noble metal elements include all of the following except:

Silver

(CH 12) How does porcelain bond to metal alloys?

By fusing to oxides formed on the surface of the metal

(CH 12) When bonding porcelain to metal for a crown, the metal must have which one of the following properties to prevent cracking of the porcelain?

Low thermal expansion

(CH 12) Metal that is formed by casting into an ingot or bar and then is altered in its form by extruding or pressing it is known as:

Wrought metal

(CH 12) High-noble alloys usually have which metals added to increase their hardness?

Silver or copper

(CH 12) Which type of orthodontic wire has the most springiness and tendency to maintain its original shape?

Nickel-titanium

(CH 12) Which of the following statements about an archwire is true?

its resistance to being shaped creates memory in the wire that helps move teeth.

(CH 12) Allergy to nickel:

Occurs 10 times more often in females than in males

(CH 12) Solder has all of the following uses except one. Which one? (A) Adding a proximal contact to a crown (B) Joining a pontic to a bridge retainer (C) Repairing a hole in the occlusal surface of a crown cemented in a patient's mouth (D) Joining a wire loop to a band to make a space retainer

Repairing a hole in the occlusal surface of a crown cemented in a patient's mouth

(CH 12) The purpose of flux used during soldering is to:

Removing oxides from the surfaces of the metals so the solder can flow and wet the surfaces better

(CH 12) Preformed metal posts are available in all of the following materials except one. Which one? (A) Pure gold (B) Stainless steel (C) Titanium (D) Titanium alloy

Pure gold

(CH 12) The purpose of a post is to:

Retain the core buildup material

(CH 12) An all-metal crown that is yellow in color has which one of the following?

Cannot tell the composition from the color

(CH 12) All of the following statements about cast posts are true except one. Which one? (A) They may be formed from a wax or acrylic resin pattern. (B) They can be cast using a high-noble, noble, or base-metal alloys (C) They usually have the core already attached to the post. (D) They are used in practice far more often than preformed posts.

They are used in practice far more often than preformed posts.

(CH 12) The alloy most used for partial denture frameworks and most resistant to fatigue failure of the clasps is which one of the following?

Cobalt-chromium alloy

(CH 13) Which metal is most commonly used for dental implants?

Titanium

(CH 13) An implant inserted into a hole drilled into bone is which of the following types?

Endosseous

(CH 13) Why is the surface of a titanium implant fixture roughened?

To provide a larger surface area for osseointegration

(CH 13) With a two-stage implant, after the fixture is placed, which one of the following occurs?

A cover screw is placed and the fixture is covered by the soft tissue flap.

(CH 13) Potential adverse outcomes when an implant fixture is surgically placed include: (A) Infection around the implant (B) Perforation of one of the cortical plates of bone (C) improper angulation of the implant (D) Damage to a nerve or a large blood vessel (E) All of the above

All of the above

(CH 13) Immediate-placement implants are done:

At the time of extraction of the tooth that will be replaced

(CH 13) Implants can be used to support which of the following prosthesis? (A) Single Crowns (B) Fixed Bridges (C) Partial or complete dentures (D) All of the above

All of the above

(CH 13) Implant crowns are fixed to the implant abutment by which method?

Cemented or held by screws

(CH 13) Which instrument(s) should be used to remove calculus from implants where titanium is exposed?

Titanium curettes and scalers

(CH 13) The closed-tray impression procedure requires that one of the following components be repositioned in its proper alignment into the set impression after it is removed from the mouth. Which one is it?

Impression abutment

(CH 13) What is the purpose of the cover screw?

Cover the screw hole on top of the fixture to prevent tissue from growing into it

(CH 13) Mini-implants can be used for which of the following purposes? (A) To support complete dentures (B) To support crowns for narrow-rooted teeth such as mandibular incisors (C) To serve as anchors for orthodontic tooth movement (D) All of the above

All of the above

(CH 13) Which type of bone graft is derived from animal tissue?

Xenograft

(CH 13) Which one of the following statements regarding the gingiva around an implant is false? (A) The gingiva has connective tissue fibers that connect or integrate with the surface of the implant. (B) When healthy, the gingiva produces a biological seal against the implant that prevent microorganisms from invading the deeper tissues. (C) The gingiva is closely adapted to the implant but is not attached to the surface. (D) Chronic inflammation of the gingiva around the implant could lead to peri-implantitis.

The gingiva has connective tissue fibers that connect or integrate with the surface of the implant.

(CH 13) The consequences of not maintaining good oral hygiene around an implant include all of the following except one. Which one?

Increased bone growth due to chronic irritation

(CH 13) Biointegration, where the bone totally integrates with the implant, is seen with which implant material?

Ceramics

(CH 13) Which part of the implant is placed in bone?

Fixture

(CH 13) Which type of suture will be absorbed naturally by the body's enzymes?

Gut

(CH 13) When removing sutures, the suture material should be cut close to the knot to prevent contamination of the subepithelial tissues with ______ as the suture is pulled through the tissue.

Bacteria

(CH 16) Cements mixed to primary consistency are used for:

High-strength bases

(CH 16) In which situation may it be necessary to place an insulating base under restorations?

Protect the pulp from sudden temperature changes

(CH 16) The test for a properly mixed zinc phosphate luting cement is:

Checking whether cement will hold a thin string, breaking when the spatula is raised an inch

(CH 16) Which cement should not be used for temporary cementation of crowns to be permanently cemented with resin cements?

Zinc oxide eugenol

(CH 16) Which cement exhibits an exothermic reaction during mixing?

Zinc phosphate

(CH 16) Which dental cements use the bonding procedure before placement of the dental cement?

Resin cement

(CH 16) When luting a crown, it is important to:

Have a film thickness that allows for complete seating

(CH 16) Why should many cements not be dispensed until ready to mix? (A) Dehydration can occur from exposure to air (B) Contamination can occur from moisture in the air (C) Components of the cement might come in contact with each other (D) All of the above

All of the above

(CH 16) Which dental cement bonds to dentin, is "kind" to the pulp, and resists recurrent decay?

Glass ionomer

(CH 16) Why is zinc phosphate cement mixed over a large area of the glass slab? (A) Helps lengthen the working time (B) Helps neutralize the chemicals (C) Helps dissipate the exothermic reaction (D) All of the above

All of the above

(CH 16) Proper instrumentation at cement margins includes:

Using air polishing on resin-based cement margins

(CH 16) Light-cured cements may be used for luting which of the following? (A) Nonmetal orthodontic retainers (B) Porcelain veneers less than 1.5 mm thick (C) Porcelain or gold inlays (D) A and B

A and B

(CH 16) Which cement should not be used under a composite restoration because of the oil content of the liquid?

Zinc oxide eugenol

(CH 16) Adhesion is molecular attraction between materials with:

Dissimilar molecules

(CH 16) When should newly mixed polycarboxylate cement no longer be used for luting?

The mix is stringy or weblike.

(CH 16) Adding resin to glass ionomer cement does all of the following except one. Which one? (A) Increases the fluoride release (B) Increases compressive strength (C) Decreases solubility (D) Increases tensile strength

Increases compressive strength

(CH 16) Failure to remove all excess cement from subgingival margins may cause all of the following except one. Which one? (A) Aphthous ulcers (B) Periodontal infection (C) Bone loss (D) Recurrent caries

Recurrent caries

(CH 16 HW Question) The main function of varnish is to:

seal dentinal tubules

(CH 16 HW Question) All of the following are true of ZOE materials EXCEPT: (A) can be used as a temporary filling material (B) fluoride release (C) obtundent material (D) can be used as a base

fluoride release

(CH 16 HW Question) This type of cement usually a dual-cure material:

composite cement

(CH 16 HW Question) The base material which is not compatible with composite resin material is:

zinc oxide eugenol

(CH 16 HW Question) Composite cements require an adhesive which bonds to the tooth and to the restoration.

True

(CH 16 HW Question) This cement material can chemical bond (adhere) to tooth structure:

glass ionomer

(CH 16 HW Question) The cement material which undergoes an exothermic reaction when setting is:

zinc phosphate

(CH 16 HW Question) Select the cement(s) which has zinc oxide powder as a primary component (more than one answer may be selected): (A) zinc oxide-eugenol (ZOE) (B) zinc phosphate (C) polycarboxylate (D) glass ionomer

(A) zinc oxide-eugenol (ZOE) (B) zinc phosphate (C) polycarboxylate

(CH 16 HW Question) Two cements that are used for caries control are:

glass ionomer and zinc oxide-eugenol (ZOE)

(CH 16 HW Question) Clean up of cements is easier after the cement has set.

False

(CH 17) The goal of finishing and polishing of restorations includes: (A) The removal of excess material (B) The smoothing of roughened surfaces (C) The production of better esthetics (D) All of the above

All of the above

(CH 17) Cleaning of teeth is primarily meant to:

Remove soft deposits

(CH 17) The depth and space between cuts made by an abrasive are determined by: (A) The properties of the abrasive (B) The properties of the substrate being abraded (C) The contour of the restoration (D) Both a and b

Both a and b

(CH 17) Which of the following represents the correct hardness ranking, from hardest to softest?

Enamel, composite, amalgam, gold

(CH 17) All of the following will increase the rate of abrasion except: (A) Increased pressure (B) Decreased speed (C) Use of larger abrasive particles (D) Use of more abrasive particles than substrate

Decreased speed

(CH 17) Which powder is best for subgingival air polishing practices?

Glycine

(CH 17) To control the numbers of abrasive particles that contact the surface:

The operator should use a lubricant

(CH 17) Loose abrasives:

Come in various shapes

(CH 17) A substance used to prevent a dentifrice from drying is called a(n):

Humectant

(CH 17) After polishing a patient's teeth, you notice scratches on a gold crown. The following most likely contributed to these scratches:

Use of an inappropriate polishing agent

(CH 17 HW questions) A toothbrush and mild cleansing agent are sufficient to remove most plaque and stains from dentures.

True

(CH 17 HW questions) You are giving your patient education on how to care for his new composite restorations on teeth 8 and 9. Your patient asks what food and drinks might stain the composite. Which of the following should your patient be mindful of? (A) Wine (B) Coffee (C) Blueberries (D) All of the above

All of the above

(CH 17 HW questions) You are polishing a substrate material with a Moh's scale of 6. Ideally, in what range on the scale should the material you use to polish it be?

7-9

(CH 17 HW questions) Aluminum oxide is the abrasive of choice for composite and amalgams.

True

(CH 17 HW questions) Abrasives are all naturally occurring substances for biocompatibility.

True