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JCO Continuing Education for May 2012 (questions only)

VOLUME 46 : NUMBER 05 : PAGES (311-312) 2012

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Click here to download a PDF of the printed questions from the journal for reference. CE tests must be taken online.

The University of Southern California School of Dentistry, an ADA CERP recognized provider, will award 3 hours of Continuing Education credit for reading this issue of JCO and answering at least 12 of the following 16 questions correctly. Take this test online at www.jco-online.com (click on Continuing Education); payment of $25 is required by VISA or MasterCard. The test may be retaken once if not passed on the first attempt. Correct answers will be supplied immediately, along with a printable certificate. Tests will be accessible on the JCO website for 12 months after publication. A subscription to JCO is not required to earn C.E. credits. For information, contact Dr. Robert Keim, (213)740-0410; e-mail: editor@jco-online.com. CER No. 08-2006-12005.

Learning Objectives


After completion of this exercise, the participant will be able to:

1. Describe a variation of the Bidimensional technique using low-friction mechanics.

2. Discuss clinical techniques for lingual orthodontic therapy.

3. Fabricate a unilateral distalization unit using skeletal anchorage.

4. Evaluate the effects of a passive self-ligating bracket system on certain anatomical landmarks.

Article 1


Giancotti, A.; Mozzicato, P.; and Greco, M.: En Masse Retraction of the Anterior Teeth Using a Modified Bidimensional Technique (pp. 267-273)

1. Advantages of the Bidimensional system include all of the following except:

a) the maxillary anterior brackets provide torque control during space closure
b) the larger wire dimension in the posterior segments provides torque control
c) the use of sliding mechanics encourages minimal friction and tipping
d) the use of sliding mechanics effects space closure without the need for loops

2. In sliding mechanics, friction occurs at the wire-bracket interface, as determined by:

a) the wire-bending stiffness
b) the contact area between wire and bracket
c) the wire shape
d) all of the above

3. Compared with two-step retraction, Xu and colleagues found that en masse retraction results in:

a) significantly greater anchorage loss
b) the same amount of anchorage loss
c) significantly longer treatment times
d) virtually the same treatment times

4. Compared to en masse retraction, studies indicate that two-step anterior retraction:

a) requires longer treatment
b) requires shorter treatment
c) results in much greater root resorption
d) results in much less root resorption

Article 2


Ludwig, B., Moderator: JCO Roundtable on Lingual Orthodontics (pp. 275-292)

5. Lingual brackets that can be used with the SureSmile QT system include:

a) virtually any lingual bracket
b) STb or Evolution
c) STb only
d) In-Ovation L only

6. The KommonBase lingual-bracket bonding system uses:

a) individual wire jigs for direct bonding of each tooth
b) extended resin pads that cover most of the lingual surfaces
c) transfer guides fabricated from Triad Gel
d) both a and b

7. In general, the panelists' lingual archwire sequences differed from their labial archwire sequences in all of the following ways except:

a) lighter initial archwires
b) more sizes of intermediate archwires
c) more stainless steel archwires
d) more TMA archwires

8. Benefits of smaller-profile lingual brackets include:

a) fewer patient problems with tongue irritation and speech difficulties
b) reduced bond-failure rates because of the shorter lever arms
c) easier biomechanics because the bracket slot is closer to the center of resistance of the tooth
d) all of the above

Article 3


Livas, C.: Mini-Implant Anchorage in a Unilateral Class II Patient (pp. 293-298)

9. Studies of the traditional Pendulum appliance have shown anterior anchorage loss of:

a) 8-11% of the space opened between the molars and premolars
b) 6-15% of the space opened between the molars and premolars
c) 18-21% of the space opened between the molars and premolars
d) 24-29% of the space opened between the molars and premolars

10. To counteract potential relapse of the buccal segment in this patient:

a) unilateral intermaxillary elastics were prescribed during anterior retraction
b) bilateral intermaxillary elastics were prescribed during anterior retraction
c) the Class II relationship was overcorrected
d) the distalization unit was left passively in place during the finishing stage

11. The distal end of the distalization unit was ligated to:

a) the head of a self-drilling mini-implant
b) the auxiliary tube of a self-ligating secondpremolar bracket
c) the auxiliary tube of a self-ligating firstmolar bracket
d) a convertible first-molar tube

12. The mini-implant insertion site between the maxillary lateral incisor and canine was chosen:

a) because of its traditionally high success rate
b) to provide greater vertical force than horizontal force
c) to provide greater horizontal force than vertical force
d) both a and c

Article 4


Ehsani, S.; Carlyle, T.; El-Bialy, T.; and Kusnoto, B.: Cephalometric Analysis of Dental and Skeletal Changes Following Treatment with a Passive Self-Ligating System (pp. 301-306)

13. Analysis of transverse measurements showed significant differences between the treatment group and the control group in:

a) upper intermolar root width
b) upper intermolar crown width
c) upper intercanine root width
d) upper intercanine crown width

14. Significant differences between the treatment group and the control group were seen in the angle between the maxillary incisors and:

a) Frankfort horizontal
b) the palatal plane
c) A-Pog
d) all of the above

15. Low expansion forces are often preferred over rapid maxillary expansion, which can generate forces as high as:

a) 1-3 pounds
b) 2-6 pounds
c) 6-8 pounds
d) 3-10 pounds

16. Maxillary incisor angular measurements increased in the treatment group, but linear measurements did not, suggesting that the patients':

a) incisal tips moved lingually
b) incisal tips moved forward
c) root apices moved lingually
d) root apices moved forward

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