AAO CONTINUING EDUCATION
C
E Earn 3 hours of CE credit CE Editor: Dr. Allen Moffitt
Instructions: To submit your answers to this test and earn 3 hours of CE are tabulated immediately. To earn 3 hours of CE credit, you must an-
credit, log on to www.AAOmembers.org. Select the link for the Store, swer 75% of the questions correctly. If you do not receive a passing
where you can purchase the examination for $20 (a 20% discount off score the first time, you can take the test again, free of charge, until
the regular $25 fee). You will receive e-mails confirming your order you pass. Upon successful completion of the test, your CE credits will
and instructing you how to access the test. Follow the instructions to be added to the AAO’s online CE Credit Manager, and you can use
complete the examination (you will be directed to a web page). Results the CE Credit Manager to print a certificate.
LEARNING OBJECTIVES
After completing this course, the participant should have: 6. Two miniscrew implants were used as anchorage for each tooth in-
1. An understanding of the influence of nickel allergy on the periodon- truded in the beagles, and a constant intrusive force of 25, 150, or
tal status of orthodontic patients. 300 g per tooth was used.
2. Knowledge of root resorption and repair after orthodontic intrusion a. True
with different force magnitudes. b. False
3. An awareness of what occurs with the alveolar bone in the site of
a missing maxillary lateral incisor after distal movement of the 7. Root resorption associated with intrusive movements was present on
canines to open the space. all teeth observed.
4. An understanding of the effect of wire adaptation of fixed retainers a. True
on the lingual surfaces of the mandibular anterior teeth on the b. False
development of vertical and labiolingual forces. 8. Root resorption occurred more frequently at the apices and interra-
dicular regions when orthodontic intrusive forces were applied.
a. True
Article 1: Nickel: Periodontal status and blood parameters in b. False
allergic orthodontic patients, by Camila Alessandra Pazzini et al
1. The aim of the study was to determine the correlation between blood Article 3: Orthodontic tooth movement: Bone formation and
parameters and periodontal abnormalities in orthodontic patients a Nova
its stability over time, by Son et al
ckova
who were allergic and nonallergic to nickel. 9. One purpose of this study was to investigate the change in the bone
a. True mass in both the vertical and horizontal dimensions during orthodontic
b. False space opening for prosthetic replacement of the maxillary lateral incisor.
2. To test the sample for nickel allergy, a skin patch test containing 5% a. True
nickel antigen was used. b. False
a. True 10. Panoramic radiographs were used to measure the thickness of the
b. False alveolar ridge.
3. The circulating nickel and immunoglobulin in the blood samples a. True
were significantly correlated in each allergic and nonallergic group. b. False
a. True 11. The distal movement of the canine creates alveolar bone, and the
b. False width in the middle of the edentulous space after movement is vir-
4. The authors concluded that nickel can potentially influence the peri- tually the same as before movement.
odontal status of allergic orthodontic patients, causing an increase a. True
in band quantification that was correlated to the gingival index. b. False
a. True 12. Clinically significant reductions in the alveolar width occurred at
b. False the 2-year and 5-year observation times.
a. True
b. False
Article 2: Histologic evaluation of root response to intrusion Article 4: In-vitro assessment of the forces generated by
in mandibular teeth in beagle dogs, by Juan I. Ramirez-Echave lingual fixed retainers, by Iosif Sifakakis et al
et al 13. The aim of this study was to assess the effect of wire adaptation on
5. The purpose of the study was to radiographically evaluate root the lingual surfaces of mandibular anterior teeth of 5 types of lin-
resorption and repair after orthodontic intrusion with different force gual retainer wires in the development of vertical and labiolingual
magnitudes and fixed anchorage. forces.
a. True a. True
b. False b. False
138.e1
14. The motivation for this study arose from the clinical observation 16. The significant determinants of the generated forces were the
that, even with a bonded mandibular anterior retainer, changes amount of wire displacement and the type of wires used in this
in tooth position can still occur. study.
a. True a. True
b. False b. False
15. Forces recorded from the lingual retainer wires during 0.2-mm
simulated intrusion-extrusion and buccal-lingual movements
might exceed 1 N, which is not large enough to produce unwanted
tooth movement during retention.
a. True
b. False
138.e2
