| 0562 Force Characteristics of Two Recently Introduced Coated Orthodontic Elastomeric Chains | ||
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C.S. WEBB, W.M. JOHNSTON, W.A. BRANTLEY, and K.W.L. VIG, The Ohio State University College of Dentistry, Columbus, USA Elastomeric chains are important orthodontic elements that are commonly used for space closure. Purpose: Compare the force decay properties of recently introduced coated elastomeric chain products from two manufacturers with their corresponding uncoated products, using an artificial saliva environment at body temperature. Methods: Unpigmented and pigmented spool chain products in both the uncoated and coated conditions were obtained from two manufacturers (GAC International; TP Orthodontics). Force degradation measurements were made on five four-link specimens for each pigment condition (pigmented or unpigmented), coating condition (coated or uncoated), and manufacturer (GAC or TP). A factory-calibrated digital force gauge (Accu Force III, Ametek, Largo, FL) was employed that inputs data directly into an Excel (Microsoft) spreadsheet. Test samples were immersed in an artificial saliva (Saliva Substitute, Roxane Laboratories, Columbus, OH) at 37°C, while being stretched 25 mm with the force gauge for 6 hours. Statistical comparisons were performed using ANOVA and the REGW multiple range test. Results: The TP Super Slick coated chains had significantly higher mean force values than the GAC Sili coated chains (p < 0.05). There was a statistically significant interaction between brand and coating and between brand and pigment. The GAC Sili products were found to have a statistically significant higher rate of force decay compared to the TP products. Log-log plots showed that the force degradation with time fit a power-law model, rather than a Maxwell-Weichert model. Conclusions: The present study suggests that the TP Super Slick products provide greater force delivery than the GAC products, with a slower rate of force decay. Considering the force levels reported to be required clinically for tooth movement, all of the elastomeric chains tested in this study should provide acceptable force delivery in vivo. | ||
| Seq #78 - Composition, Physical Properties, and Fatigue 10:15 AM-11:30 AM, Thursday, 11 March 2004 Hawaii Convention Center Exhibit Hall 1-2 | ||
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Back to the Dental Materials: VI - Polymer Materials-Mechanical Properties and Degradation Program
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