Overview of CEREC CAD/CAM chairside system

Self Instruction Exercise No. 321
Member Information
Required for AGD members
Required for non-members
Are you an AGD member?
Yes    No
If Yes, please enter your AGD Number:
Full Name (First & Last):
Address:
Address 2:
City:
State/Province:
ZIP/Postal Code:
Country:
E-mail:
Promotional Code


Payment Information

Enroll me for Self-Instruction so that I can submit this exercise. My credit card information is entered below. I understand that my card will be charged $30 if I am an AGD member and $50 if I am a non-member.

I am currently enrolled in the Self-Instruction program. (If you are unsure of your enrollment status, please call 888.243.3368, ext. 4336.)

 
Card Type  
Visa          MasterCard    American Express   
Card Number  
Expiration Date    


Exercise No. 321
Subject Code: 561
Information Technology/Computers

The 15 questions for this exercise are based on the article Overview of CEREC CAD/CAM chairside system, on pages 36-40. This exercise was developed by Daniel S. Geare, DMD, in association with the General Dentistry Self-Instruction committee.

Reading the article and successfully completing this exercise will enable you to understand

  • the advantages and limits of CEREC technology;
  • the clinical qualities of CAD/CAM restorations; and
  • the types of porcelain and composite used in CAD/CAM technology.

Answers for this exercise must be received by December 31, 2013.

  1. The disadvantages of metal-ceramic restorations include all of the following except one. Which is the exception?

    A. Metal allergy
    B. Esthetics
    C. Corrosion
    D. Low shear strength

  2. Prevalence for contact allergy in nickel-containing crowns is reported to be as high as _____%.

    A. 0.88
    B. 8
    C. 9
    D. 29

  3. Popular characteristics of ceramic crowns include all of the following except one. Which is the exception?

    A. Greater esthetics
    B. Increased durability
    C. Reduced pulpal trauma
    D. Greater wear resistance

  4. The maximum clinically acceptable margin gap for all crowns is _____ µm.

    A. 65
    B. 80
    C. 120
    D. 135

  5. The CAD/CAM CEREC system eliminates the need for all of the following except one. Which is the exception?

    A. Impressions
    B. Provisionalization
    C. Lab assistance
    D. Preparation design

  6. Criticism of the CEREC system was focused on

    A. marginal fit.
    B. color stability.
    C. occlusal design.
    D. fracture resistance.

  7. The CEREC crowns have been shown to have better esthetics than standard porcelain crowns. There is a reduction in color matching due to the change in tooth shade over time.

    A. Both statements are true.
    B. The first statement is true; the second is false.
    C. The first statement is false; the second is true.
    D. Both statements are false.

  8. The CAD/CAM restorations have a marginal fit of approximately _____ µm.

    A. 15
    B. 25
    C. 50
    D. 90

  9. Limits of the CAD/CAM system include all of the following except one. Which is the exception?

    A. Need to use gingival retraction
    B. Single units only
    C. Polishing time
    D. Unpredictable shades

  10. CAD/CAM-prepared restorations are more structurally reliable than laboratory-made restorations. This is because CAD/CAM restorations eliminate subsurface flaws in the ceramic.

    A. Both statements are true.
    B. The first statement is true; the second is false.
    C. The first statement is false; the second is true.
    D. Both statements are false.

  11. According to Attia & Kern, fracture resistance of teeth restored with CEREC-manufactured crowns was _____________ unprepared natural teeth.

    A. equivalent to
    B. less than
    C. more than
    D. unrelated to

  12. Postoperative sensitivity with CEREC restorations is primarily attributed to

    A. occlusal interference.
    B. marginal leakage.
    C. excessive preparation depth.
    D. poor tooth isolation on cementation.

  13. Failure of ceramic inlays and onlays is caused by all of the following except one. Which is the exception?

    A. Poor preparation design
    B. Tooth fracture
    C. Tooth extraction
    D. Inlay fracture

  14. All of the following statements are true except one. Which is the exception?

    A. Feldspathic porcelain uses leucite particles embedded in a glass matrix.
    B. Empress porcelain resists cracks due to leucite crystals.
    C. IPS e.max porcelain resists fracture by high-pressure fusing of porcelain powder.
    D. Paradigm MZ100 crosslinks zirconia with a silica matrix.

  15. Disadvantages of CAD/CAM include all of the following except one. Which is the exception?

    A. Time for training
    B. Cost of equipment
    C. Time to polish restorations
    D. Capturing the digital impressions


Evaluation

Please respond to the statements below, using the following scale:
1 Poor; 2 Below average; 3 Average; 4 Above average; 5 Excellent

Practicality of the content 1 2 3 4 5
Benefit to your clinical practice 1 2 3 4 5
Quality of illustrations 1 2 3 4 5
Clarity of objectives 1 2 3 4 5
Clarity of exercise questions 1 2 3 4 5
Relevance of exercise questions 1 2 3 4 5
 
Did this exercise achieve its objectives? Yes No
Did this article present new information? Yes No
How much time did it take you to complete this exercise? mins


Cancel   
Facebook   Twitter AGD Advocacy   Linked In   AGD Blogger   YouTube   Google+