Abstract: Instructions: To receive 3 hours of CE credit, please answer the following questions, complete the registration form and submit the form by mail or fax, with your payment of $25, to: American Association of Orthodontists Attn: Education Department 401 N Lindbergh Blvd Saint Louis, MO 63141-7816 Fax: (314) 692-8178 Fax submissions accepted with credit card payment only. The return form should be received by our office before the deadline of January 25, 2004. If you have at least 12 correct answers, verification of 3 hours credit will be sent to you. Please allow 4-6 weeks for processing. For information: • Call: Christina Marcos, (314) 993-1700 • E-mail: [email protected] The American Association of Orthodontists is a Recognized Provider, ADA CERP. After completing this course, the participant will be able to: 1.Discuss the stability of titanium screws in orthodontic implants.2.Evaluate friction with different bracket types.3.Evaluate 1-step etchant-and-primer techniques.4.Discuss the differences between latex and silicone rubber bands. Article 1. Factors associated with the stability of titanium screws placed in the posterior region for orthodontic anchorage, by Shouichi Miyawaki, et al 1.Which variable was not examined in this study? a.Age.b.Skeletal Angle classification.c.Sex.d.Profile.2.Which implant anchor was not tested? a.Titanium screws 1 mm in diameter, 6 mm in length.b.Titanium screws 1.5 mm in diameter, 11 in mm length.c.Titanium screws 2.3 mm in diameter, 14 mm in length.d.Miniplates with 4 screws, 2 mm in diameter, 10 mm in length.3.The width of the buccal cortical bone in both jaws correlates with the size of the titanium screws and their ultimate success. a.This statement is true.b.This statement is false.4.If an implant anchor is to be placed into the buccal alveolar bone of the posterior region, a diameter of more than 1 mm is desirable in patients with average to low mandibular plane angles, and larger diameter screws or miniplates are desirable in patients with high mandibular plane angles. Inflammation in the peri-implant tissue is related to the ultimate success of the implant anchor. a.The first statement is true; the second is false.b.The first statement is false; the second is true.c.Both statements are true.d.Both statements are false. Article 2. Evaluation of friction of stainless steel and esthetic self-ligating brackets in various bracket-archwire combinations, by Vittorio Cacciafesta, et al 5.The objectives were to compare (1) frictional resistance with different wire sizes; (2) frictional resistance of stainless steel self-ligating brackets, polycarbonate self-ligating brackets, and conventional stainless steel brackets; (3) frictional resistance of stainless steel self-ligating brackets, polycarbonate self-ligating brackets, and conventional stainless steel brackets and 3 wire types; and (4) frictional resistance of stainless steel self-ligating brackets, polycarbonate self-ligating brackets, and conventional stainless steel brackets and 3 wire sizes. a.1, 2, and 3.b.1, 2, and 4.c.2, 3, and 4.d.All of the above.6.This study demonstrated that stainless steel self-ligating brackets generated less frictional forces than conventional stainless steel and polycarbonate self-ligating brackets. There was no frictional resistance difference among the 3 wire types. a.The first statement is true; the second is false.b.The first statement is false; the second is true.c.Both statements are true.d.Both statements are false. Article 3. Evaluation of friction of conventional and metal-insert ceramic brackets in various bracket-archwire combinations, by Vittorio Cacciafesta, et al. 7.The objectives were to compare (1) frictional resistance with different wire sizes; (2) frictional resistance of conventional ceramic brackets, ceramic brackets with stainless steel slots, and conventional stainless steel brackets; (3) frictional resistance of conventional ceramic brackets, ceramic brackets with stainless steel slots, conventional stainless steel brackets, and 3 wire types; and (4) frictional resistance of stainless steel self-ligating brackets, polycarbonate self-ligating brackets, and conventional stainless steel brackets and 3 wire sizes. a.1, 2, and 3.b.1, 2, and 4.c.2, 3, and 4.d.All of the above.8.This study showed that metal-insert ceramic brackets generate higher frictional forces than conventional ceramic brackets and stainless steel brackets. There were no frictional resistance differences between the 3 different wire types. a.The first statement is true; the second is false.b.The first statement is false; the second is true.c.Both statements are true.d.Both statements are false. Article 4. Shear bond strength of orthodontic brackets bonded with a modified 1-step etchant-and-primer technique, by Jason C. Dorminey, William J. Dunn, and Louis J. Taloumis 9.What was the main objective of this study? a.To compare the shear bond strength of different orthodontic brackets.b.To measure the effects of acid etching on bond strength by using brackets bonded in vivo and in vitro.c.To compare the shear bond strength of orthodontic brackets bonded to enamel with a conventional multistep adhesive system and a self-etching primer adhesive system.d.To compare the shear bond strength of orthodontic brackets bonded to enamel when air dispersion is used in both the conventional multistep adhesive system and the self-etching primer adhesives system.10.A total of 108 first premolars were divided into 3 groups. The bonded teeth were stored for 24 hours in artificial saliva and then subjected to shear force until failure. a.The first statement is true; the second is false.b.The first statement is false; the second is true.c.Both statements are true.d.Both statements are false.11.What was the effect of the air-blast step on the shear bond strength of the teeth bonded with the self-etching primer? a.There was no effect.b.There was a negligible effect.c.The absence of the air-blast step resulted in significantly less shear bond strength when the self-etching primer adhesive system and conventional, multistep bonding procedures were compared.d.There was no difference when the self-etching primer group was not appropriately air-thinned.12.Which statement is true? a.Self-etching primers have a high pH to facilitate etching.b.Self-etching primers are aqueous mixtures of acidic functional monomers and more.c.Self-etching primers leave the characteristic frosty appearance on the etched surface. Article 5. Mechanical and biological comparison of latex and silicone rubber bands, by Chung-Ju Hwang and Jung-Yul Cha 13.The purposes were to compare (1) the mechanical properties of latex and gum rubber bands, (2) the mechanical properties of latex and silicone rubber bands, (3) the biologic properties of latex and gum rubber bands, and (4) the biologic properties of latex and silicone rubber bands. Which is correct? a.1, 2, and 3.b.2, 3, and 4.c.2 and 4.d.1 and 4.14.Which statement is correct? a.Three latex groups and 1 silicone group (300 elastics), all 0.25 in, were subjected to extensions.b.Two latex groups and 2 silicone groups (300 elastics), all 0.25 in, were subjected to extensions.c.Three latex groups and 1 silicone group (100 elastics), all 3/8 in, were subjected to extensions.d.Three latex groups and 1 silicone group (300 elastics) were subjected to extensions of 125%, 200%, and 350%.15.Silicone rubber bands compared very favorably with latex rubber bands in force levels at all extensions. a.This statement is true.b.This statement is false.16.Compared with latex bands, silicone bands showed a little change in original physical properties at high and low temperatures and superior air and water properties. Silicone bands compared favorably with the best latex bands in cytotoxicity levels. a.The first statement is true; the second is false.b.The first statement is false; the second is true.c.Both statements are true.d.Both statements are false.