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JCO Continuing Education for August 2012 (questions only)

VOLUME 46 : NUMBER 08 : PAGES (491-492) 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. 08-2006-12008.

Learning Objectives

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

1. Discuss the use of Pendulum appliances followed by skeletal anchorage for retraction.

2. Employ a noninvasive system to upright lower second and third molars.

3. Evaluate the use of a low-profile bondable attachment in eruption techniques.

4. Describe a modified transpalatal arch that can be used with palatal anchorage in open-bite cases.

Article 1

Hilgers, J.J.; Nissen, S.H.; and Tracey, S.G.: The PIT and the Pendulum: Pendulum-Integrated TADs (pp. 465-479)

1. With a Pendulum appliance, the ratio of uppermolar distalization to anchorage loss in the remainder of the upper arch is generally:

a) 1:1
b) 3:2
c) 2:1
d) 1:2

2. The authors recommend use of the Pendulum appliances only in patients with:

a) strong mesofacial or brachyfacial muscular patterns
b) dolichofacial or mesofacial muscular patterns
c) Class II, division 1 malocclusions and brachyfacial muscular patterns
d) Class II, division 2 malocclusions and dolichofacial muscular patterns

3. The second molars may be extracted to create space for distalized first molars if all of the following criteria are met except that:

a) reciprocal anterior movement of the upper incisors is desirable
b) the third molars are good replacements
c) the dentition is fully erupted
d) little growth is expected

4. Benefits of the Pendulum-Integrated TADs technique include:

a) easy miniscrew placement due to the wide interradicular spaces opened with the Pendulum
b) maintenance of the distalized molars while the buccal segments drift distally
c) use of either direct or indirect skeletal anchorage, depending on the needs of the patient
d) all of the above

Article 2

Bach, R.M.: Non-Surgical Uprighting of Exposed, Mesially Impacted Lower Molars (pp. 480-485)

5. By looping the piggyback wire and inserting it into the impacted molar bracket from the distal:

a) the mesial marginal ridge of the impacted tooth is driven into the distal submarginal ridge of the anterior tooth
b) the distal cusp of the impacted tooth is elevated into hyperocclusion
c) intrusive and distalizing forces are effectively delivered
d) intrusive and distalizing forces are ineffectively delivered

6. The bead of composite placed at the end of the Copper Ni-Ti piggyback wire:

a) prevents the archwire from pulling distally out of the bracket
b) contacts the mesial aspect of the self-ligating bracket, inhibiting distal moment
c) elevates the impacted molar's distal cusp into hyperocclusion
d) both a and b

7. Bonding a self-ligating bracket to the impacted molar:

a) allows easy insertion of the looped wire from the distal
b) allows insertion of the wire with a composite bead at the distal end
c) reduces archwire binding in the bracket, potentially eliminating buccal rolling of the tooth
d) all of the above

8. The author recommends the uprighting technique for all of the following situations except:

a) mesially impacted lower second molars
b) mesially impacted lower third molars
c) mesially impacted upper third molars
d) a severely tipped upper first molar caught beneath the second deciduous molar

Article 3

Vashi, N. and Vashi, B.: Eruption and Alignment of Impacted Teeth with Multi-Purpose Attachments (pp. 486-490)

9. The thickness of the Multi-Purpose Attachment (MPA) at its base and lumen is:

a) .4mm and 2mm, respectively
b) .4mm and 1mm, respectively
c) 1mm and 1.4mm, respectively
d) 2mm and 3mm, respectively

10. The MPA is especially useful in avoiding:

a) irritation to the patient¢™s lips, tongue, and buccal mucosa
b) gingival trauma during tooth eruption
c) occlusal interference in deep-bite cases
d) all of the above

11. The MPA's lumen can be threaded with an archwire as large as:

a) .014" nickel titanium
b) .016" nickel titanium
c) .018" nickel titanium
d) .020" nickel titanium

12. To rotate or upright a single tooth with the MPA, the authors recommend ligation using:

a) a nickel titanium wire segment threaded through the lumen
b) elastomeric thread or chain
c) a single loop of ligature wire passed through the lumen
d) a "double tie" of ligature wire attached to the archwire at both ends of the lumen

Article 4

Razavi, M.R.: Molar Intrusion Using Miniscrew Palatal Anchorage (pp. 493-498)

13. For intrusion mechanics, the modified transpalatal arch (TPA) should be positioned 5mm from the palate and:

a) 5mm from the palatal walls
b) 4mm from the palatal walls
c) 3mm from the palatal walls
d) 2mm from the palatal walls

14. The vertical forces applied during molar intrusion are resisted by using:

a) two palatal miniscrews joined by a plate
b) two palatal miniscrews joined by a ligature
c) a single palatal miniscrew angled 15-20º to the posterior
d) a single palatal miniscrew angled 15-20º to the anterior

15. The modified TPA:

a) expands the buccal segments
b) includes bilateral loops for attachment of closed-coil springs
c) includes distally extending arms for attachment of closed-coil springs
d) is anchored with a single palatal miniscrew

16. Advantages of palatal miniscrew anchorage include:

a) the availability of dense cortical bone for screw retention
b) resistance of the keratinized palatal tissue to irritation and inflammation
c) low risk of nerve or blood-vessel damage
d) all of the above

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