Midterm Final Questions

Which of the following tooth preparation features will least influence resistance form?

Finish line preparation design

The following protheses are considered partial coverage, restorations, except:

All of the above are partial coverage restorations

The following prosthesis are considered a fixed dental prostheses, except:

Implant retained overdentures

The reference plain of the Kois- Dental facial analyzer is:

Horizon

The reference plane of the average axis earbow facebow is

Frankfort plane

Which of the following is not an advantage of indirect gold restorations compare compared to amalgam restorations?

No lab procedures

Which of the following is true when comparing subtractive manufacturing with additive manufacturing?

Subtract manufacturing, generally, is a faster processed than additive manufacturing

A dice spacer creates space for cement in the restoration and should be kept away from the finish line of the dye to ensure a gap free fit at the margin

True

Which of the following is correct regarding the fabrication of a solid cast with individual die?

The solid working cast needs to be mounted on the articulator

Based on the attached impression image, what might be the cause of the error?

Blood and saliva contamination around the preparation

To ensure accuracy, alginate impressions should be poured within 15 minutes of removal from the mouth. The cash should be separated from the impression one hour after being poured.

Both statements are true

Which of the following statements is an advantage of a complete crown?

It is adaptable to proper axial wall contours such as when there is furcation involvement

Which principle is most critical and preventing crown dislodgment along the path of insertion or long access of the tooth preparation?

Retention form

Theoretically, for a complete coverage restoration, maximum retention would be obtained if the tooth preparation had parallel wall. However, a slight taper or convergence of the prepared tooth walls is clinically recommended to prevent undercuts and reduce hydraulic pressure from the cement that can interfere with the proper seating of the restoration during cementation.

Both statements are true

Which of the following statements about intraoral scanners is correct?

Metallic restorations or saliva coded teeth, may result in excessive reflection and lead to incorrect data acquisition

Which of the following statements about a custom tray is correct?

Improves the accuracy of an elastomeric impression by limiting the volume of the material

In the double cord technique, what is the purpose of the second cord?

To deflect the tissue further and deliver astringent

According to Roudsari et al. which of the following will increase the resistance form of a short molar prepared for a complete cast crown?

Decreasing the TOC from 22 degrees to 4 degrees in the apical 1.5mm of the reduced axial surfaces

What is the ideal amount of reduction for each area of the Maxillary First Molar for a complete cast metal crown finish line width, buccal cusp, and lingual cusp occlusal reduction?

Finish line width: 0.5mm, Buccal cusp: 1.5mm, Lingual cusp: 1.0mm

Which statement is NOT correct regarding biological width?

Biological width consists of junctional epithelium and sulcular epithelium, which is about 3.0mm

Which of the following is a biologic consideration in tooth preparation?

Conservation of tooth structure

Which of the following is NOT a valid reason for placing subgingival margin?

Root canal treated teeth

To capture a subgingival finish line preparation in the final impression, it is necessary to expose the finish line and some unprepared tooth structure prior to impression making. This can be accomplished by removing the inner epithelial lining with electro surgery or by displacing the ginger tissue using a retraction cord which is commonly impregnated with a chemical agent.

Both statements are true

Which of the following CAD/CAM workflows is not correct:

Design restoration-scan preparation-manufacturer restoration

Which of the following will not help avoid trapping voids in the working cast while pouring the definitive impression

Spraying separating agent on the impression and allow allow to dry before pouring it

When making an impression of tooth number 14 for a crown preparation using a triple tray, which of the following will not be included in the impression

Contralateral teeth

What is the purpose of trimming the die?

To make the finish line accessible for waxing procedures

Which chemical used for gingival placement may cause tachycardia and should be used with caution?

Epinephrine