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JCO Continuing Education for July 2012 (questions only)

VOLUME 46 : NUMBER 07 : PAGES (437-438) 2012

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The University of Southern California School of Dentistry Orthodontic Alumni Association 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. 08-2006-12007.

Learning Objectives


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

1. Describe the design and application of a distalization appliance anchored in the anterior palate.

2. Use nasion as a stable reference point for surgical-orthodontic planning and evaluation.

3. Evaluate the effectiveness of two bone substitutes in an adult periodontal patient requiring orthodontic tooth movement.

4. Discuss clinical considerations in treatment of Class III open-bite patients with amelogenesis imperfecta.

Article 1


Wilmes, B.; Nienkemper, M.; Ludwig, B.; Kau, C.H.; Pauls, A.; and Drescher, D.: Esthetic Class II Treatment with the Beneslider and Aligners (pp. 390-398)

1. The Beneslider uses open-coil springs to deliver distalizing forces of:

a) 120g for children and 240g for adults
b) 240g for both children and adults
c) 240g for children and 500g for adults
d) 350g for children and 500g for adults

2. Changing the angulation of the Beneslider's .045" wire can produce simultaneous molar distalization and:

a) rotation or extrusion
b) intrusion or extrusion
c) rotation and extrusion
d) intrusion and rotation

3. The Beneslider system can usually be placed without the need for:

a) welding or soldering
b) taking an impression
c) measuring soft-tissue thickness
d) both a and b

4. The authors' previous work has shown that the Beneslider produced an average bodily molar movement of:

a) 1.4mm
b) 2.4mm
c) 3.6mm
d) 4.6mm

Article 2


Ahn, J.; Mah, J.; Kim, J.; and Park, Y.: Orthognathic Surgical Planning Using Nasion True Vertical and True Horizontal Lines (pp. 407-415)

5. The authors' system measures linear changes along the x and y axes for A point, B point, and:

a) subnasale
b) pogonion
c) glabella
d) porion

6. The system based on the nasion true vertical line (NTVL) and true horizontal line takes advantage of the high reproducibility of:

a) ANB
b) SN
c) natural head position
d) the palatal plane angle

7. Using Frankfort horizontal for surgical diagnosis may introduce significant errors because of the reported inter-individual variability 0f:

a) 1-2º
b) 3-4º
c) 5-6º
d) 6-8º

8. The NTVL-true horizontal system provides all of the following advantages except:

a) simplified soft-tissue analysis
b) stability of landmarks after surgical alteration to the maxilla
c) easy analysis of hard-tissue surgical results
d) ability to plan surgical movements in four directions

Article 3


Fung, K.; Chandhoke, T.K.; Uribe, F.; and Schincaglia, G.A.: Periodontal Regeneration and Orthodontic Intrusion of a Pathologically Migrated Central Incisor Adjacent to an Infrabony Defect (pp. 417-423)

9. In patients with periodontitis undergoing orthodontic tooth movement, better results have been found when tooth movement:

a) precedes guided tissue regeneration
b) precedes periodontal treatment
c) follows periodontal treatment
d) coincides with periodontal treatment

10. This patient's infrabony defect was treated with a combination of enamel matrix derivatives (EMD) and:

a) a bone graft
b) biphasic calcium phosphate
c) a collagen membrane
d) both a and b

11. Harrel and colleagues found that treatment of periodontal bony defects with EMD produced:

a) a reduction in pocket-probing depth
b) a reduction in clinical attachment
c) an improvement in clinical attachment
d) both a and c

12. This case and other studies of orthodontic intrusion of periodontally involved teeth have shown an improvement in gingival recession of:

a) 25%
b) 50%
c) 60-65%
d) 75-80%

Article 4


Finkelstein, T.; Shapira, Y.; and Shpack, N.: Nonsurgical Treatment of Severe Open Bite Associated with Amelogenesis Imperfecta (pp. 427-433)

13. The hypocalcified type of amelogenesis imperfect (AI) is distinguished by enamel that appears:

a) deficient in quantity but relatively well mineralized
b) deficient in quantity and poorly mineralized
c) normal in quantity but poorly mineralized
d) normal in quantity but mottled in appearance

14. Clinical problems associated with all types of AI include:

a) loss of tooth material
b) tooth discoloration
c) thermal tooth sensitivity
d) all of the above

15. Nonsurgical camouflage of this patient's severe Class III open-bite malocclusion required all of the following except:

a) a midpalatal miniscrew and Class III elastics
b) lower posterior bite blocks
c) a Hyrax expander and a tongue crib
d) high-pull headgear and vertical anterior elastics

16. Because of the difficulty in bonding composite resin to AI-affected enamel, it may be necessary to prepare the teeth with:

a) 40% phosphoric acid
b) 20% phosphoric acid
c) 5% sodium hypochlorite
d) non-staining 9.5% hydrofluoric acid

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